abvx-20260630

INTRODUCTION

Unless otherwise indicated or the context otherwise requires, “Abivax,” “the Company,” “the Group,” “we,”

“us” and “our” refer to Abivax SA and its consolidated subsidiary, taken as a whole.

“Abivax” and the Abivax logo and other trademarks or service marks of Abivax SA appearing in this half-year

report are the property of Abivax SA. Solely for convenience, the trademarks, service marks and trade names

referred to in this half-year report are listed without the ® and ™ symbols, but such references should not be construed

as any indicator that their respective owners will not assert, to the fullest extent under applicable law, their right

thereto. All other trademarks, trade names and service marks appearing in this half-year report are the property of

their respective owners. We do not intend to use or display other companies’ trademarks and trade names to imply

any relationship with, or endorsement or sponsorship of us by, any other companies.

This half-year report includes our unaudited interim condensed consolidated financial statements of financial

position as of June 30, 2026 and December 31, 2025 and the related unaudited condensed consolidated statements of

loss and comprehensive loss for each of the three- and six-month periods ended June 30, 2026 and June 30, 2025

and the unaudited condensed consolidated statements of cash flows and changes in shareholder's equity for the six-

month periods ended June 30, 2026 and June 30, 2025, prepared in accordance with International Financial

Reporting Standards ("IFRS") as issued by the International Accounting Standards Board ("IASB") and adopted by

the European Union ("EU") regulation n°1606/2022 of July 19, 2022. None of our financial statements were

prepared in accordance with U.S. generally accepted accounting principles ("U.S. GAAP"). Our financial statements

are presented in euros and, unless otherwise stated, all monetary amounts are in euros. All references in this half-

year report to “$”, “U.S. dollars” and “dollars” mean U.S. dollars, and all references to “€”, “EUR” and “euros”

mean European Monetary Union euros, unless otherwise noted. Throughout this half-year report, references to

"ADSs" mean American Depositary Shares ("ADSs") or ordinary shares represented by such ADSs, as the case may

be.

Special Note Regarding Forward-Looking Statements

This half-year report contains forward-looking statements within the meaning of Section 27A of the Securities

Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended ("Exchange Act"),

that are based on our management’s beliefs and assumptions and on information currently available to our

management. All statements other than present and historical facts and conditions contained in this half-year report,

including statements regarding our future results of operations and financial positions, business strategy, plans and

our objectives for future operations, are forward-looking statements. When used in this half-year report, the words

“anticipate,” “believe,” “can,” “could,” “estimate,” “expect,” “intend,” “is designed to,” “may,” “might,” “plan,”

“will,” “would,” “potential,” “predict,” “objective,” “should,” or the negative of these and similar expressions

identify forward-looking statements. Forward-looking statements include, but are not limited to, statements about:

•the prospects of attaining, maintaining and expanding marketing authorization for our lead drug candidate,

obefazimod;

•the potential attributes and clinical advantages of obefazimod and our future drug candidates;

•the initiation, timing, progress and results of our preclinical and clinical trials (and those conducted by third

parties) and other research and development programs;

•the timing of the availability of data from our clinical trials, including our Phase 2b trial of obefazimod in

Crohn’s disease;

•the timing of and our ability to advance drug candidates through clinical development;

•the timing or likelihood of regulatory meetings and filings;

•the timing of and our ability to obtain and maintain regulatory approvals for obefazimod and any of our

future drug candidates;

•our ability to identify and develop new drug candidates from our preclinical studies;

•our ability to develop sales and marketing capabilities and transition into a commercial-stage company;

•the effects of increased competition as well as innovations by new and existing competitors in our industry;

•our ability to enter into strategic relationships or partnerships;

•our ability to obtain, maintain, protect and enforce our intellectual property rights and proprietary

technologies and to operate our business without infringing the intellectual property rights and proprietary

technology of third parties;

•our estimate of the period of time through which we anticipate our financial resources will be adequate to

support our operations;

•our estimates regarding expenses, future revenues, capital requirements and the need for additional

financing;

•the impact of government laws and regulations;

•our competitive position; and

•unfavorable conditions in our industry, the global economy or global supply chain, including financial and

credit market fluctuations, international trade relations, political turmoil, natural catastrophes, warfare (such

as the Russia-Ukraine war and the conflict in the Middle East), and terrorist attacks.

We encourage you to read and carefully consider all of the risk factors disclosed in our annual report on Form

20-F for the year ended December 31, 2025 filed with the Securities and Exchange Commission ("SEC") on March

23, 2026 (the "Annual Report") under the caption “Item 3.D—Risk Factors” for a more complete understanding of

the risks and uncertainties that we believe are material to our business, including important factors that may cause

our actual results to differ materially from those expressed or implied by our forward-looking statements. As a result

of these factors, we cannot assure you that the forward-looking statements in this document will prove to be

accurate. Furthermore, if our forward-looking statements prove to be inaccurate, the inaccuracy may be material. In

light of the significant uncertainties in these forward-looking statements, you should not regard these statements as a

representation or warranty by us or any other person that we will achieve our objectives and plans in any specified

time frame or at all. These forward-looking statements represent our plans, objectives, estimates, expectations and

intentions only as of the date of this filing. We undertake no obligation to publicly update any forward-looking

statements, whether as a result of new information, future events or otherwise, except as required by law.

You should read this document and the documents that we reference herein completely and with the

understanding that our actual future results may be materially different from what we expect. We qualify all of our

forward-looking statements by these cautionary statements.

Rounding of Figures

Certain figures (including data expressed in thousands or millions of euros or dollars) and the percentages

presented in this half-year report have been rounded up or down. Accordingly, totals given may vary slightly from

those obtained by adding the rounded values of those same figures.

OPERATING RESULTS

Overview

We are a clinical-stage biotechnology company focused on developing therapeutics that harness the body’s

natural regulatory mechanisms to stabilize the immune response in patients with chronic inflammatory diseases. Our

lead drug candidate, obefazimod, is currently being evaluated in the following indications:

•Ulcerative colitis ("UC"): Phase 3 clinical trials for the treatment of adults with moderately to severely

active UC are ongoing ("ABTECT"). On July 22, 2025, we announced the positive Phase 3 results of our

ABTECT 8-week induction trials. On June 1, 2026, we announced positive results from Part 1 of the Phase 3

ABTECT 44-week maintenance trial, demonstrating strong efficacy, including robust endoscopic remission,

and on June 29, 2026, we announced positive topline results from Part 2 of the maintenance trial. Part 2 of the

maintenance trial enrolled patients who either did not achieve clinical response following induction treatment

or who experienced disease relapse during the re-randomized maintenance trial (Part 1), expanding both the

efficacy and safety results in a more refractory patient population than the registrational maintenance cohort.

Following a positive pre-NDA ("New Drug Application") interaction with the U.S. Food and Drug

Administration ("FDA"), we aligned with the agency on the planned content, format and submission strategy

for obefazimod’s NDA for adults with moderately to severely active UC. We believe we remain on track to

submit our NDA to the U.S. FDA in the fourth quarter of 2026.

•Crohn’s disease ("CD"): Our ENHANCE-CD Phase 2b clinical trial of obefazimod in patients with CD is

still ongoing, and the 12-week induction topline data read-out is expected in mid-2027.

•Combination therapy: In September 2024, we announced initial preclinical combination data of obefazimod

combined with etrasimod in a mouse model of inflammatory bowel diseases ("IBD"). The results showed that

treatment with the combination improved the response on body weight protection and Disease Activity Index

and a synergistic and statistically significant reduction of several cytokines (TNFa, IL-17, IL-6, IFNg) in the

blood compared to each drug alone. Additional preclinical data to support our decision-making on a

combination agent is expected by the end of 2026.

•Anti-fibrotic effects: In February 2026, we announced the results of two pre-clinical sets of experiments

that were performed to assess the anti-fibrotic effects of obefazimod.

In addition, we have launched a research and development program to generate new potential drug candidates

to strengthen our intellectual property portfolio on the miR-124 platform and to identify additional drug candidates

from our proprietary small molecule library that includes additional miR-124 enhancers. We expect to announce the

selection of a follow-on compound in 2026.

Recent Developments

Completion of Public Offering on Nasdaq – July 2026

On July 6, 2026, we announced the completion of an underwritten public offering of 7,360,000 ADSs (the

“2026 Offering”), each representing one ordinary share of the Company, which includes the full exercise of the

underwriters’ option to purchase additional ADSs, at a price of $125.00 per ADS (corresponding to €109.71 per

ordinary share, based on the exchange rate of €1.00 = $1.1394 as published by the European Central Bank on June

30, 2026). Thenet proceeds, after deducting underwriting commissions and estimated offering expenses, were

approximately$874.1 million, equivalent to approximately €767.1 million.

We believe that the net proceeds from the 2026 Offering, together with our current cash and cash

equivalents, will allow us to finance our operations for at least 12 months from the date of issuance of the unaudited

interim condensed consolidated financial statements included in this half-year report.

Royalty Certificate Repurchase

On May 4, 2026, we entered into a purchase agreement with the holders of our royalty certificates (the

“Holders”) pursuant to which we repurchased all of our royalty certificates for an aggregate price of $90 million

(approximately €76.5 million), of which $45 million was paid in cash on May 7, 2026.

We were granted an interest-free vendor’s loan ("crédit vendeur") in a total amount equal to the remaining $45

million, which was reinvested in our securities by way of set-off against the subscription price of 403,347 ordinary

shares represented by ADSs issued to the Holders, at an offering price of $111.57 per ADS (corresponding to €95.34

per ordinary share). The set-off and the corresponding issuance and delivery of the ADSs to the Holders occurred on

May 7, 2026. The vendor’s loan was fully extinguished at that date. All of the royalty certificates were immediately

cancelled following the transaction.

The repurchase of our royalty certificates on May 7, 2026 resulted in the recognition of an expense of

approximately €43.2 million in the second quarter of 2026. The amount corresponds to the difference between the

royalty certificates' carrying amount on the repurchase date of €33.5 million and the total consideration transferred,

comprising cash and equity consideration of €38.2 million and €38.5 million, respectively, based on the exchange

rates prevailing at the capital increase date and the settlement dates (including the €0.2 million effect of a net foreign

exchange loss on the cash settlement). Consequently, the €5.8 million deferred tax liability recognized in our

statements of financial position as of December 31, 2025 has been derecognized, and a corresponding tax income

has been recognized, for the six-month period ended June 30, 2026.

Three-Year Interim Data from Our Phase 2a/2b Open-Label Extension Trial (Study 108) of Obefazimod

On May 22, 2026, we reported three-year interim data from Study 108, a Phase 2a/2b open-label maintenance

("OLM") trial of obefazimod following dose de-escalation in patients with ulcerative colitis. In this study, patients

who had completed the four-year Phase 2a or two-year Phase 2b OLM trials, where they had received 50 mg of

once-daily obefazimod, were given the opportunity to continue receiving obefazimod at a reduced dose of 25 mg

daily for up to five additional years (provided they met the eligibility criteria of Mayo Endoscopic Subscore = 0 or

1). A total of 130 patients entered the trial, and as of the January 5, 2026 cutoff date, 80% (104/130) were still

enrolled and completed the full 144-week evaluation.

At study baseline, 89% (116/130) of patients were in clinical remission. At weeks 48, 96 and 144 of treatment,

73% (95/130), 69% (90/130), and 68% (88/130) of patients evaluated were in clinical remission, respectively.

Clinical remission, inclusive of endoscopic subscore, was evaluated in the intent-to-treat population using non-

responder imputation. Similar trends were observed with other efficacy analyses, and no new safety signals were

observed. We believe these data demonstrated durable clinical remission and a favorable long-term safety profile

with up to seven years of obefazimod exposure, reinforcing the durability and safety data observed across the Phase

3 ABTECT program.

Results of Operations

The following discussion covers the material changes in financial condition and results of operations for the three

and six-months ended June 30, 2025 and June 30, 2026, for which consolidated statements of loss are presented in

the accompanying financial statements.

Comparison of the Three Months Ended June 30 2025 and 2026

The following table sets forth our results of operations for the three months ended June 30 2026 and 2025.


(In thousands of euros)	Three Months Ended June 30 2025	Three Months Ended June 30 2026	2026 vs 2025 Change
Other operating income....................................................	1,093	1,201	10%

Total operating income.........................................................	1,093	1,201	10%

Sales and marketing expenses.............................................	(674)	(2,885)	328%
Research and development expenses..................................	(38,645)	(58,335)	51%
General and administrative expenses.................................	(8,270)	(24,092)	191%

Total operating expenses......................................................	(47,589)	(85,312)	79%

Operating loss........................................................................	(46,496)	(84,111)	81%

Financial expenses........................................................	(5,415)	(44,130)	715%
Financial income...........................................................	3,497	4,733	35%

Financial loss.........................................................................	(1,918)	(39,397)	1954%

Net loss before tax.................................................................	(48,414)	(123,508)	155%

Income Tax....................................................................	—	6,076	–%

Net loss for the period...........................................................	(48,414)	(117,433)	143%

Total Operating Income

For the three months ended June 30 2026 our total operating income was €1.2 million, as compared to €1.1

million for the three months ended June 30 2025, an increase of €0.1 million or 10%as detailed below.

Other Operating Income

The following table sets forth our other operating income for the three months ended June 30 2026 and 2025.


(In thousands of euros)	Three Months Ended June 30 2025	Three Months Ended June 30 2026	2026 vs 2025 Change
CIR (Research Tax Credits)....................................................	1,047	976	(7)%
Depositary service fees...........................................................	46	225	391%

Total other operating income...............................................	1,093	1,201	10%

For the three months ended June 30 2026, our other operating income was €1.2 million, as compared to €1.1

million for the three months ended June 30 2025, an increase of €0.1 million, or 10%, as detailed below.

Research Tax Credits ("CIR")

For the three months ended June 30 2026, we recognized research tax credits for our research and

development projects of €1.0 million, as compared to €1.0 million for the three months ended June 30 2025, a

decrease of €(0.1) million, or (7)%. The comparatively limited decrease in research tax credits, despite a €19.7

million, or 51%, increase in research and development expenses for the three months ended June 30 2026 as

compared to the three months ended June 30 2025,was primarily attributable to the statutory cap applicable to

eligible outsourced research and development expenses.

Depositary Service Fees

As part of our depositary agreement with Citibank (which is acting as our exclusive depositary for our

publicly listed ADSs), weare entitled to receive a portion of the fees collected by Citibank on ADS transactions

(e.g., issuance, cancellation and depositary service fees).

For the three months ended June 30 2026,our income related to depositary service fees was€0.2 million, as

compared to €0.05 millionfor the three months ended June 30 2025, an increase of €0.2 million, or 391%. The 2026

fees mainly reflect the larger number of transactions that occurred during the second quarter of 2026 compared to

2025.

Total Operating Expenses

For the three months ended June 30 2026, our total operating expenses were €85.3 million, as compared to

€47.6 millionfor the three months ended June 30 2025, an increase of €37.7 million, or 79%. This increase was

primarily due to an increase in research and development expenses of €19.7 million, an increase in general and

administrative expenses of €15.8 million and an increase in sales and marketing expenses of €2.2 million, each as

described below.

Sales and Marketing Expenses

Sales and marketing expenses consist primarily of personnel expenses, including share-based compensation

expenses, for employees engaged in sales and marketing activities, as well as consulting costs associated with

market research in preparation for our potential future sales and commercialization efforts in the U.S.

For the three months ended June 30 2026, our total sales and marketing expenses were €2.9 million, as

compared to €0.7 millionforthethree months ended June 30 2025, an increase of €2.2 million, or 328%. The

increase was predominantly driven by costs related to our preparation for potential future sales and

commercialization efforts for obefazimod in the U.S. (including the hiring of our commercial leadership team).

Research and Development Expenses

The following table sets forth our research and development expenses by drug candidate and therapeutic

indication for the three months ended June 30 2026 and 2025.


(In thousands of euros)	Three Months Ended June 30 2025	Three Months Ended June 30 2026	2026 vs 2025 Change
Obefazimod.................................................................................	36,613	56,526	54%
Ulcerative Colitis...............................................................	22,754	35,200	55%
Crohn's Disease..................................................................	4,021	8,274	106%
Obefazimod Other Indications...........................................	1,171	1,742	49%
Transversal activities.........................................................	8,667	11,310	30%
Others..........................................................................................	2,031	1,809	(11)%
Research and Development expenses.......................................	38,645	58,335	51%

For the three months ended June 30 2026, our research and development expenses were €58.3 million, as

compared to€38.6 million for the three months ended June 30 2025, an increase of €19.7 million, or 51%.

This increase was primarily due to (i) an increase in expenses related to our UC program of €12.4 million, or

55%, attributable to an increase in share-based compensation expense related to the impact of share-based

compensation awards granted in 2025 and partly offset by decreased activity on our ABTECT clinical program as a

result of reaching a major milestone with our Phase 3 induction trials in 2025. The increase was secondarily due to

(ii) an increase in expenses related to our CD program of €4.3 million, or 106%, resulting from the progression of

our Phase 2b trials in CD, (iii) an increase in expenses related to transversal activities of €2.6 million, or 30%,

mainly due to increased chemistry, manufacturing and controls ("CMC") and supply chain costs related to the

progression of clinical trials and anticipation of potential future commercial launch and (iv) an increase in expenses

related to new indications (including combination therapy) for obefazimod of €0.6 million or 49%.

In aggregate, the increase in share-based compensation expense related to the impact of share-based

compensation awards granted in 2025 contributed to the overall increase in research and development expenses in an

amount of €6.2 million (of which €4.3 million related to UC, and €1.9 million related to CD). The related employer

tax and social contributions further contributed to the overall increase across all destinations in an amount of €6.7

million.

General and Administrative Expenses


(In thousands of euros)	Three Months Ended June 30 2025	Three Months Ended June 30 2026	2026 vs 2025 Change
Personnel costs........................................................................	5,488	17,461	218%
Consulting and professional fees............................................	1,768	4,829	173%
Other general and administrative expenses.............................	1,014	1,802	78%
General and administrative expenses..................................	8,270	24,092	191%

For the three months ended June 30 2026, our general and administrative expenses were €24.1 million, as

compared to €8.3 million for the three months ended June 30 2025, an increase of €15.8 million, or 191%. This

increase was primarily due to a €12.0 million, or 218%, increase in personnel costs, primarily attributable to an

increase in share-based compensation expense related to the impact of share-based compensation awards granted in

2025 and the related tax and social contributions, in an amount of €9.8 million, and to a lesser extent to the increase

in our headcount. The increase was also due to a €3.1 million, or 173%, increase in consulting and professional fees,

driven by increased costs associated with building our infrastructure to support future growth in our operations and

to a lesser degree by a €0.8 million, or 78%, increase in other general and administrative expenses.

Operating Loss

For the three months ended June 30 2026, our net operating loss was €84.1 million, as compared to a net

operating loss of €46.5 million for the three months ended June 30 2025, an increase of €37.6 million, or 81%. This

was primarily due to a €19.7 million, or 51%, increase in research and development expenses, an increase of €15.8

million, or 191%, in general and administrative expenses and an increase in sales and marketing expenses of €2.2

million, or 328%.

Financial Loss

For the three months ended June 30 2026, our net financial loss was €39.4 million, as compared to a net

financial loss of €1.9 million for the three months ended June 30 2025, mainly driven by the €43.2 million loss on

derecognition of our royalty certificates following their repurchase on May 7, 2026, partly offset by (i) interest

income of €1.2 million and fair value changes of €2.1 million in relation to the invested proceeds from our U.S.

initial public offering and listing on Nasdaq and (ii) foreign exchange gains of €1.3 million.

For thethree months ended June 30 2025, our net financial loss of €5.4 million was mainly driven by (i)

interest expenses of €3.4 million related to the first tranche of senior secured convertible bonds with warrants

attached in the Kreos / Claret Financing (the "Kreos / Claret OCABSA"), the second and third tranches of the senior

secured bonds in the Kreos / Claret Financing (drawn on March 28, 2024 and June 21, 2024 respectively) and the

senior convertible notes in the Heights Financing (the "Heights Convertible Notes"), (ii) non-cash expenses of €0.5

million related to the increase in the fair value of our derivatives and (iii) foreign exchange losses of €1.4 million

(including the €1.1 million non-cash impact of the revaluation of U.S. dollar-denominated cash and cash equivalents

as of June 30, 2025).

These costs were partly offset mainly by our financial income of €3.5 million, primarily related toa non-cash

income of €2.8 million related to the decrease in the fair value of the Heights Convertible Notes.

Income Taxes

For the three months ended June 30 2026, our tax income was€6.1 million, as compared to€— million for the

three months ended June 30, 2025,attributable to the derecognition of our net deferred tax liability of €6.1 million

recognized in our unaudited interim condensed consolidated statements of financial position as of March 31, 2026.

The deferred tax liability resulted from the significant taxable temporary difference arising from our royalty

certificates as of March 31, 2026, which in turn resulted from the difference between (i) the amount already

deductible from our taxable income as of March 31, 2026 (based on the certificates' fair value minus their

subscription price) and (ii) the amount of the related financial liability recognized in our condensed consolidated

statements of financial position at that date (measured at amortized cost using the original effective interest rate).

Further explanation on the calculation of the deferred tax liability is disclosed in Note 22 to our financial

statements as of and for the year ended December 31, 2025 included in our AnnualReport on Form 20-F for the year

ended December 31, 2025.

The tax income is non-cash for the three months ended June 30, 2026.

Net Loss

For the three months ended June 30 2026, our net loss was €117.4 million, as compared to €48.4 million for

the three months ended June 30 2025, an increase of €69.0 million, or 143%, mainly driven by an increase in

financialloss of €37.5 million and an increase in operating loss of €37.6 million, as described above.

Comparison of the Six Months Ended June 30 2025 and 2026

The following table sets forth our results of operations for the six months ended June 30, 2025 and 2026.


(In thousands of euros)	Six Months Ended June 30 2025	Six Months Ended June 30 2026	2026 vs 2025 Change
Other operating income.................................................	2,087	2,545	22%

Total operating income.........................................................	2,087	2,545	22%

Sales and marketing expenses.......................................	(1,534)	(4,633)	202%
Research and development expenses.............................	(77,946)	(107,878)	38%
General and administrative expenses............................	(16,303)	(30,376)	86%

Total operating expenses......................................................	(95,783)	(142,886)	49%

Operating loss........................................................................	(93,696)	(140,341)	50%

Financial expenses........................................................	(10,857)	(48,899)	350%
Financial income...........................................................	3,769	17,491	364%

Financial loss.........................................................................	(7,088)	(31,408)	343%

Net loss before tax.................................................................	(100,784)	(171,748)	70%

Income Tax....................................................................	—	5,848	—%

Net loss for the period...........................................................	(100,784)	(165,900)	65%

Total Operating Income

For the six months ended June 30, 2026, our total operating income was €2.5 million, as compared to €2.1

million for the six months ended June 30, 2025, an increase of €0.5 million, or 22%, as detailed below.

Other Operating Income

The following table sets forth our other operating income for the six months ended June 30, 2025 and 2026.


(In thousands of euros)	Six Months Ended June 30 2025	Six Months Ended June 30 2026	2026 vs 2025 Change
CIR (Research Tax Credits)....................................................	2,017	2,115	5%
Depositary service fees...........................................................	70	430	512%
Total other operating income...............................................	2,087	2,545	22%

For the six months ended June 30, 2026, our other operating income was€2.5 million, as compared to €2.1

million for the six months ended June 30, 2025, an increase of €0.5 million, or 22%, as detailed below.

Research Tax Credits ("CIR")

For the six months ended June 30, 2026, we recognized research tax credits for our research and development

projects of €2.1 million, as compared to €2.0 million for the six months ended June 30, 2025, an increase of €0.1

million, or 5%. The comparatively limited increase in research tax credits, despite a €(29.9) million, or 38%,

increase in research and development expenses for the six months ended June 30, 2026 as compared to the six

months ended June 30, 2025, was primarily attributable to the statutory cap applicable to eligible outsourced

research and development expenses.

Depositary Service Fees

As part of our depositary agreement with Citibank (which is acting as our exclusive depositary for our

publicly listed ADSs), weare entitled to receive a portion of the fees collected by Citibank on ADS transactions

(e.g., issuance, cancellation and depositary service fees).

For the six months ended June 30, 2026,our income related to depositary service fees was €0.4 million, as

compared to €0.1 millionfor the six months ended June 30, 2025, an increase of €0.4 million, or 512%. The increase

mainly reflects the larger number of transactions that occurred during the first half of 2026 compared to the first half

of 2025.

Total Operating Expenses

For the six months ended June 30, 2026, our total operating expenses were €142.9 million, as compared to

€95.8 million for the six months ended June 30, 2025, an increase of €47.1 million, or 49%. This increase was

primarily due to an increase in research and development expenses of €29.9 million, an increase in general and

administrative expenses of €14.1 million and an increase in sales and marketing expenses of €3.1 million, each as

described below.

Sales and Marketing Expenses

Sales and marketing expenses consist primarily of personnel expenses, including share-based compensation

expenses, for employees engaged in sales and marketing activities, as well as consulting costs associated with

market research in preparation for our potential future sales and commercialization efforts in the U.S.

For the six months ended June 30, 2026, our total sales and marketing expenses were €4.6 million, as

compared to €1.5 millionforthesix months ended June 30, 2025, an increase of €3.1 million, or 202%. The increase

was predominantly driven by costs (including personnel costs) related to our preparation for potential future sales

and commercialization efforts for obefazimod in the U.S.

Research and Development Expenses

The following table sets forth our research and development expenses by drug candidate and therapeutic

indication for the six months ended June 30, 2025 and 2026.


(In thousands of euros)	Six Months Ended June 30 2025	Six Months Ended June 30 2026	2026 vs 2025 Change
Obefazimod.................................................................................	77,161	103,335	34%
Ulcerative Colitis...............................................................	51,929	60,412	16%
Crohn's Disease..................................................................	7,416	13,717	85%
Obefazimod Other Indications...........................................	2,988	9,772	227%
Transversal activities.........................................................	14,829	19,435	31%
Others..........................................................................................	784	4,542	479%
Research and Development expenses.......................................	77,946	107,878	38%

For the six months ended June 30, 2026, our research and development expenses were €107.9 million, as

compared to€77.9 million for the six months ended June 30, 2025, an increase of €29.9 million, or 38%.

This increase was primarily due to an increase in expenses related to our UC program of €8.5 million, or 16%,

attributable to an increase in share-based compensation expense related to the impact of share-based compensation

awards granted in 2025 and partly offset by decreased activity in our ABTECT clinical program as a result of

reaching a major milestone with our Phase 3 induction trials in 2025, an increase in expenses related to new

indications (including combination therapy) for obefazimod of €6.8 million or 227%, an increase in expenses related

to our CD program of €6.3 million, or 85%, resulting from the progression of our Phase 2b trials in CD and an

increase in expenses related to transversal activities of €4.6 million, or 31%, mainly due to increased CMC and

supply chain costs related to the progression of clinical trials and anticipation of potential future commercial launch.

In aggregate, an the increase in share-based compensation expense related to the accelerated vesting of certain

of our former Chief Scientific Officer's AGAs in March 2026, as well as the impact of share-based compensation

awards granted in 2025, contributed to the overall increase in research and development expenses in an amount of

€23.7 million (of which €10.8 million related to UC, €6.1 million related to Obefazimod Other Indications and €3.9

million related to CD). The related employer tax and social contributions further contributed to the overall increase

across all destinations in an amount of €8.4 million.

General and Administrative Expenses


(In thousands of euros)	Six Months Ended June 30 2025	Six Months Ended June 30 2026	2026 vs 2025 Change
Personnel costs........................................................................	10,547	19,101	81%
Consulting and professional fees............................................	3,703	8,173	121%
Other general and administrative expenses.............................	2,053	3,101	51%
General and administrative expenses..................................	16,303	30,376	86%

For the six months ended June 30, 2026, our general and administrative expenses were €30.4 million, as

compared to €16.3 million for the six months ended June 30, 2025, an increase of €14.1 million, or 86%. This

increase was primarily due to a €8.6 million, or 81%, increase in personnel costs, primarily attributable to an

increase in share-based compensation expense related to the impact of share-based compensation awardsgranted in

2025 and the related tax and social contributions, in an amount of €6.1 million, and to a lesser extent to the increase

in our headcount. The increase was also due to a €4.5 million, or 121%, increase in consulting and professional fees,

driven by increased costs associated with building our infrastructure to support future growth in our operations and

to a lesser degree by a €1.0 million, or 51%, increase in other general and administrative expenses.

Operating Loss

For the six months ended June 30, 2026, our net operating loss was €140.3 million, as compared to a net

operating loss of €93.7 million for the six months ended June 30, 2025, an increase of €46.6 million, or 50%. This

increase was primarily due to an increase in research and development expenses of €29.9 million or 38%, an

increase in general and administrative expenses of €14.1 million or 86% and an increase in sales and marketing

expenses of €3.1 million or 202%.

Financial Loss

For the six months ended June 30, 2026, our net financial loss was€31.4 million, as compared to a net

financial loss of €7.1 millionfor the six months ended June 30, 2025,was mainly driven by (i) the €43.2 million loss

on derecognition of our royalty certificates following their repurchase on May 7, 2026, (ii) non-cash expenses of

€3.2 million related to our royalty certificates and (iii) foreign exchange losses of €2.4 million, partly offset by (i)

foreign exchange gains of €10.0 million (including the €6.7 million and €2.7 million non-cash impacts of the

revaluation of U.S. dollar-denominated intercompany receivables and cash and cash equivalents, respectively, as of

June 30, 2026) and (ii) interest income of €1.9 million and fair value changes of €5.4 million in relation to the

invested proceeds from our U.S. initial public offering and listing on Nasdaq.

For thesix months ended June 30, 2025, our financial loss of €7.1 million was mainly driven by interest

expenses of €6.9 million in relation to the first tranche of Kreos / Claret OCABSA, the second and third tranches of

the senior secured bonds in the Kreos / Claret Financing (drawn on March 28, 2024 and June 21, 2024 respectively)

and the Heights Convertible Notes, non-cash expense of €1.1 million in relation to our royalty certificates and

foreign exchange losses of €2.3 million (including the €0.4 million non-cash impact of the revaluation of U.S.

dollar-denominated cash and cash equivalents as of June 30, 2025).

These costs were partly offset mainly by interest income of €1.1 million in relation to the invested proceeds

from our U.S. initial public offering and listing on Nasdaq, a non-cash income of €1.3 million related to the decrease

in the fair value of the Heights Convertible Notes and a €0.5 million income related to the fair value changes of

certain of our cash equivalents.

Income Taxes

For the six months ended June 30, 2026, our tax income was €5.8 million, as compared to €— million for the

six months ended June 30, 2025, attributable to the derecognition of our net deferred tax liability of €5.8 million

recognized in our consolidated statements of financial position as of December 31, 2025.

The deferred tax liability resulted from the significant taxable temporary difference arising from our royalty

certificates as of December 31, 2025, which in turn resulted from the difference between (i) the amount already

deductible from our taxable income as of December 31, 2025 (based on the certificates' fair value minus their

subscription price) and (ii) the amount of the related financial liability recognized in our condensed consolidated

statements of financial position at that date (measured at amortized cost using the original effective interest rate).

Further explanation on the calculation of the deferred tax liability is disclosed in Note 22 to our financial

statements as of and for the year ended December 31, 2025 included in our AnnualReport on Form 20-F for the year

ended December 31, 2025.

The deferred tax expense is non-cash for the six months ended June 30, 2026.

Net Loss

For the six months ended June 30, 2026, our net loss was €165.9 million, as compared to €100.8 million for

the six months ended June 30, 2025, an increase of €65.1 million, or 65%, mainly driven by an increase in financial

loss of €24.3 millionand an increase in operating loss of €46.6 million, as described above.

Liquidity and Capital Resources

Sources of Liquidity

We have incurred substantial operating losses since inception and expect to continue to incur significant

operating losses for the foreseeable future and may never become profitable. For the six months ended June 30, 2025

and 2026, we reported net losses of €100.8 million and €165.9 million, respectively. As of December 31, 2025, we

carried forward accumulated tax losses of €912.9 million.

Since inception, we have financed our operations through the issuance of ordinary shares with gross aggregate

proceeds of €2,002.1 million, of which €130.0 million of gross proceeds were from offerings of our ordinary shares

on Euronext Paris in February 2023, €223.3 million of gross proceeds were from offering of our ordinary shares in

the form of ADS on the Nasdaq Global Market in our U.S. initial public offering as well as ordinary shares in

Europe (including France) and countries outside of the United States in a private placement in October 2023, €637.5

million of gross proceeds were from the offering of our ordinary shares in the form of ADS on the Nasdaq Global

Market in July 2025 (the "2025 Offering"), €807.4 million of gross proceeds were from the offering of ordinary

shares in the form of ADSs on the Nasdaq Global Market in July 2026 (the “2026 Offering”), bank borrowings and

structured loans of €175.0 million, reimbursements of CIR in an amount of €41.2 million, grants received from

Bpifrance (including €21.3 million of subsidies and €1.8 million of conditional advances) and royalty certificates in

an amount of €2.9 million.

In addition, on November 19, 2024, we entered into an equity distribution agreement with Piper Sandler & Co.

("Piper Sandler") allowing us to issue and sell from time to time, in one or more "at the market" offerings through

Piper Sandler acting as sales agent, ordinary shares in the form of ADSs, each ADS representing one ordinary share,

nominal value of €0.01 per share, with aggregate gross sales proceeds of up to $150.0 million (the "ATM Program").

To date, we have not sold any ADSs pursuant to the ATM Program.

Based on (a) our existing cash and cash equivalents and other short-term investments of €402.4 millionas of

June 30, 2026 and (b) the net proceeds from the July 2026 Offering of €767.1 million, we expect, as of the date of

issuance of the unaudited interim condensed consolidated financial statements included in this half-year report, to be

able to fund our forecasted cash flow requirements as they fall due for at least 12 months. Our forecasted cash flow

requirements reflect continued investment in the extension of the Phase 3 clinical program for obefazimod in UC,

the advancement of the Phase 2b ENHANCE-CD clinical trial in CD, with expected 12-week induction topline

results in mid-2027, the planned submission of an NDA for obefazimod in UC in the fourth quarter of 2026, and the

continued buildout of the U.S. commercial organization in preparation for a potential commercial launch of

obefazimod in UC, if approved. Our forecasted cash flow requirements also include ongoing general and

administrative expenses, working capital requirements and other operating activities necessary to support our

business.

Based on the above, management has concluded that our existing cash, cash equivalents and other short-term

investments are sufficient to fund our operating and capital expenditure requirements for a period greater than 12

months from the date of issuance of the financial statements accompanying this half-year report, and the

accompanying financial statements have been prepared on a going concern basis.

Capital Increases

On July 28, 2025, we received gross proceeds of €637.5 million from the issuance of 11,679,400 ordinary

shares in the form of ADSs, at a price of $64.00 per share (corresponding to €54.58 per ordinary share).

On May 7, 2026, as part of the settlement of the repurchase of our royalty certificates, we issued 403,347

ordinary shares in the form of ADSs to the benefit of the holders of our royalty certificates, at an offering price of

$111.57 per share (corresponding to €95.34 per ordinary share), representing an aggregate amount of €38.5 million.

On July 6, 2026, we received gross proceeds of €807.4 million from the issuance of 7,360,000 ordinary shares

in the form of ADSs, at a price of $125.00 per share (corresponding to €109.71 per ordinary share).

Research Tax Credits

From our inception toJune 30, 2026, we have benefited from refunds of CIRs in a total amount of €41.2

million.

We currently expect to receive CIRs of €3.2 million with respect to eligible research expenses incurred during

the year ended December 31, 2025 in the second half of 2026.

In June 2025, we received CIRs of €5.7 million with respect to eligible research expenses incurred during the

year ended December 31, 2024.

Indebtedness

For a description of material financing agreements, see "Item 10.C. Material Contracts" of the Company’s

AnnualReport on Form 20-F for the year ended December 31, 2025.

In connection with the repurchase of our royalty certificates in May 2026, we were granted an interest-free

vendor’s loan ("crédit vendeur") in a total amount equal to $45 million, which was reinvested in our securities by

way of set off against the subscription price of 403,347 ordinary shares in the form of ADSs issued to the benefit of

the royalty certificate holders, at an offering price of $111.57 per ADS (corresponding to €95.34 per ordinary share).

The set-off and the corresponding issuance and delivery of the ADSs to the holders occurred on May 7, 2026. The

vendor's loan was fully extinguished at that date. The royalty certificates were immediately cancelled following the

transaction.

Historical Changes in Cash Flows

The following table sets forth our cash inflows and outflows for the six-month periods ended June 30, 2025

and 2026.


(In thousands of euros)	Six Months Ended June 30 2025	Six Months Ended June 30 2026	2026 vs 2025 Change
Net cash flows (used in) operating activities...............................	(66,618)	(102,509)	54%
Net cash flows provided by (used in) investing activities............	1,269	1,466	16%
Net cash flows provided by (used in) financing activities...........	(16,604)	(39,276)	137%
Effect of movements in exchange rates on cash held...................	(1,785)	6,206	(448)%
Revaluation of cash equivalents measured at fair value..............	462	5,420	1,072%
Net (decrease) in cash and cash equivalents............................	(83,275)	(128,693)	55%

Cash and cash equivalents at the beginning of the period......	144,221	516,685	258%

Cash and cash equivalents at the end of the period................	60,946	387,992	537%

Operating Activities

For the six months ended June 30, 2026, cash used in operating activities was €102.5 million, as compared to

€66.6 millionfor the six months ended June 30, 2025, an increase of €35.9 million, or 54%. Net cash used in

operating activities for both periods was predominantly related to payments for the progression of our UC and CD

trials and personnel, legal, professional and infrastructure costs associated with operating as a dual-listed public

company. The increase was mostly driven by the increase in our operating loss (as explained above), partly offset by

changes in our working capital requirements of €15.5 million for the six months ended June 30, 2025, resulting

primarily from an increase in our trade payables reflecting the progress of our Phase 3 clinical trials. For the six

months ended June 30, 2026, the changes in our working capital requirements further contributed to our net cash

used in operating activities for €3.7 million.

Investing Activities

For the six months ended June 30, 2026, cash provided by investing activities amounted to €1.5 million,

primarily reflecting interest received on our invested proceeds from our 2025 Offering.

Forthesix months ended June 30, 2025, cash provided by investing activities amounted to €1.1 million and

was mainly driven by €1.0 million of interest received on our invested proceeds from our initial public offering on

the Nasdaq Global Market and private placement in October 2023.

Financing Activities

For the six months ended June 30, 2026, cash used in financing activities was €39.3 million, which primarily

consisted of the portion of the repurchase of our royalty certificates settled in cash (€38.2 million).

For the six months ended June 30, 2025, cash used in financing activities was €16.6 million, which consisted

of repayments of €12.6 million (of which €9.1 million under the tranches A, B and C of the Kreos / Claret

Financing, €2.2 million under the Heights Convertible Notes and €1.2 million under the PGE) and interest payments

of €3.9 million.

Material Cash Requirements

Contractual Obligations and Loans

The following table sets forth information about material contractual obligations as of June 30, 2026.

The commitment amounts in the table below are associated with contracts that are enforceable and legally

binding and that specify all significant terms, including fixed or minimum services to be used, fixed, minimum or

variable price provisions, and the approximate timing of the actions under the contracts. Future events could cause

actual payments to differ from these estimates. All amounts except the retirement benefits in the table below are

presented gross and are undiscounted.


	As of June 30, 2026	As of June 30, 2026	As of June 30, 2026
	Less than	More than
(In thousands of euros)	1 year	1 year	Total
Lease obligations.................................	1,096	142	1,238
Retirement benefits.............................	—	696	696
Off-balance sheet obligations..............	186,350	—	186,350

Total....................................................	187,446	838	188,284

In the ordinary course of our business, we regularly use the services of subcontractors and enter into research

and partnership arrangements with various contract research organizations (“CROs”) and with public-sector partners

or subcontractors, who conduct clinical trials and studies in relation to our drug candidates. Off-balance sheet

obligations in the table above are commitments related to these research and partnership agreements. They are

classified at less than one year maturity in the absence of a fixed schedule in contracts, in case of multiple-year

contracts, such as CRO contracts. CRO contracts include payments that are conditional to the completion of future

development milestones. The majority of the commitments with our CROs are cancellable under certain

circumstances such as insolvency, study put on hold by competent authorities, breach in regulations or negligence in

the provision of the services.

As of June 30, 2026, our contractual obligations were €188.3 million, comprising off-balance sheet obligations

of €186.3 million with respect to purchase obligations, lease obligations of €1.2 million and retirement benefits

obligations of €0.7 million.

F-2

ABIVAX SA UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL

POSITION


(Amounts in thousands of euros)		AS OF DECEMBER 31, 2025	AS OF JUNE 30, 2026
ASSETS
Non-current assets
Goodwill	6	18,419	18,419
Intangible assets	7	6,605	6,605
Property, plant and equipment	8	2,090	1,522
Other financial assets	9	5,358	5,460
Other receivables and assets	10	625	2,579
Total non-current assets		33,097	34,585
Current assets
Other financial assets	9	21,415	22,692
Other receivables and assets	10	13,144	16,941
Cash and cash equivalents	11	516,685	387,992
Total current assets		551,244	427,624
TOTAL ASSETS		584,341	462,209
LIABILITIES AND SHAREHOLDERS' EQUITY
Shareholders’ equity
Share capital		785	798
Premiums related to share capital		1,190,593	1,228,664
Translation reserve		2,309	1,768
Retained earnings		(402,380)	(699,063)
Net loss for the period		(336,102)	(165,900)
Total shareholders’ equity	13	455,205	366,266
Non-current liabilities
Retirement benefit obligations	16	627	696
Provisions	17.3	28,849	23,422
Borrowings	15	554	137
Royalty certificates	15	30,237	—
Deferred tax liabilities	22	5,848	—
Total non-current liabilities		66,114	24,254
Current liabilities
Borrowings	15	1,302	1,075
Provisions	17.3	17,030	23,914
Trade payables and other current liabilities	17.1	37,552	39,010
Tax and employee-related payables	17.2	7,137	7,689
Total current liabilities		63,021	71,688
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY		584,341	462,209

F-3

ABIVAX SA UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF LOSS


(Amounts in thousands of euros, except share and per share amounts)	Notes	FOR THE THREE MONTHS ENDED JUNE 30, 2025	FOR THE THREE MONTHS ENDED JUNE 30, 2026	FOR THE SIX MONTHS ENDED JUNE 30, 2025	FOR THE SIX MONTHS ENDED JUNE 30, 2026
Other operating income	18	1,093	1,201	2,087	2,545
Total operating income		1,093	1,201	2,087	2,545
Sales and marketing	19.1	(674)	(2,885)	(1,534)	(4,633)
Research and development	19.2	(38,645)	(58,335)	(77,946)	(107,878)
General and administrative	19.3	(8,270)	(24,092)	(16,303)	(30,376)
Total operating expenses		(47,589)	(85,312)	(95,783)	(142,886)
Operating loss		(46,496)	(84,111)	(93,696)	(140,341)
Financial expenses		(5,415)	(44,130)	(10,857)	(48,899)
Financial income		3,497	4,733	3,769	17,491
Financial gain (loss)	21	(1,918)	(39,397)	(7,088)	(31,408)
Net loss before tax		(48,414)	(123,508)	(100,784)	(171,748)
Income tax	22	—	6,076	—	5,848
Net loss for the period		(48,414)	(117,433)	(100,784)	(165,900)
Loss per share (€/share)
Weighted average number of outstanding shares used for computing basic/diluted loss per share		63,440,023	79,647,974	63,409,688	79,274,779
Basic / diluted loss per share (€/share)	23	(0.76)	(1.47)	(1.59)	(2.09)

F-5

ABIVAX SA UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY


(In thousands of euros, except share amounts)	Notes	NUMBER OF SHARES ISSUED	SHARE CAPITAL	PREMIUMS RELATED TO SHARE CAPITAL	TRANSLATION RESERVE	RETAINED EARNINGS	NET LOSS FOR THE YEAR	TOTAL SHAREHOLDER S' EQUITY
AS OF DECEMBER 31, 2024		63,347,837	633	478,905	(75)	(262,637)	(176,242)	40,584
Net loss for the period		—	—	—		—	(100,784)	(100,784)
Other comprehensive income (loss)	16	—	—	—	559	36	—	594
Total comprehensive loss for the period		—	—	—	559	36	(100,784)	(100,189)
Appropriation of prior period net loss		—	—	—	—	(176,242)	176,242	—
Issue of share warrants	14	—	—	300	—	—	—	300
Issue of free shares	14	124,096	1	(1)	—	—	—	—
Share-based compensation expense	14	—	—	—	—	11,021	—	11,021
Others		—	—	—	—	4	—	4
AS OF JUNE 30, 2025		63,471,933	635	479,204	484	(427,819)	(100,784)	(48,280)

AS OF DECEMBER 31, 2025		78,536,412	785	1,190,593	2,309	(402,380)	(336,102)	455,205
Net loss for the period		—	—	—	—	—	(165,900)	(165,900)
Other comprehensive income (loss)	16	—	—	—	(541)	9	—	(532)
Total comprehensive loss for the period		—	—	—	(541)	9	(165,900)	(166,432)
Appropriation of prior period net loss		—	—	—	—	(336,102)	336,102	—
Capital increase from issuance of ordinary shares	15.5, 13.2	403,347	4	37,449	—	—	—	37,453
Issue of share warrants	14	—	—	475	—	—	—	475
Exercises of share warrants	13.2, 14	18,940	—	155	—	—	—	155
Issue of free shares	14	858,370	9	(9)	—	—	—	—
Share-based compensation expense	14	—	—	—	—	39,410	—	39,410
AS OF JUNE 30, 2026	13.1	79,817,069	798	1,228,664	1,768	(699,063)	(165,900)	366,266

F-6

ABIVAX SA UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS


(Amounts in thousands of euros)	Notes	FOR THE SIX MONTHS ENDED JUNE 30, 2025	FOR THE SIX MONTHS ENDED JUNE 30, 2026
Cash flows provided by (used in) operating activities
Net loss for the period		(100,784)	(165,900)
Adjustments for:
Amortization of intangibles and depreciation of property, plant and equipment		524	741
Retirement benefit obligations	16	71	65
Share-based compensation expenses	14	11,021	39,410
Interest expenses and other financial expenses	21	10,375	48,904
Financial income	21	(2,029)	(17,299)
Effect of unwinding the discount related to advances	21	(362)	(193)
Increase/(decrease) in derivatives and liabilities measured at fair value	15	(929)	—
Changes in provisions	17.3	—	1,314
Current and deferred tax income	22	—	(5,853)
Other		35	38
Cash flows provided by (used in) operating activities before change in working capital requirements		(82,079)	(98,774)
Decrease / (increase) in other receivables and related accounts		2,287	(5,026)
Increase / (decrease) in trade payables		13,738	1,445
Increase / (decrease) in tax and social security liabilities		(1,314)	(87)
Change in deferred income and other liabilities		750	(66)
Changes in working capital requirements		15,461	(3,735)
Income taxes paid		—	—
Cash flows provided by (used in) operating activities		(66,618)	(102,509)
Cash flows provided by (used in) investing activities
Acquisitions of property, plant and equipment		(63)	(166)
Advances reimbursed by / (made to) CROs	10	40	43
Increase in deposits	9	(6)	—
Decrease in deposits	9	120	—
Interest received		1,178	1,589
Cash flows provided by (used in) investing activities		1,269	1,466
Cash flows provided by (used in) financing activities
Transaction costs related to capital increase	15.5	—	(1,002)
Exercise of warrants	14	—	155
Warrants subscription	14	300	475
Repayments of convertible loan notes	15	(2,188)	—
Repayments of non-convertible bond loans	15	(9,140)	—
Repayment of PGE	15	(1,250)	—
Repayment of royalty certificates	15	—	(38,233)
Payments of the lease liabilities	15	(458)	(648)
Interest paid	15	(3,868)	(24)
Other		—	—
Cash flows provided by (used in) financing activities		(16,604)	(39,276)
Effect of movements in exchange rates on cash held	11	(1,785)	6,206
Revaluation of cash equivalents measured at fair value	11 & 21	462	5,420
Increase (decrease) in cash and cash equivalents		(83,275)	(128,693)
Cash and cash equivalents at the beginning of the year	11	144,221	516,685
Cash and cash equivalents at the end of the year	11	60,946	387,992
Increase (decrease) in cash and cash equivalents		(83,275)	(128,693)

F-7

ABIVAX SA NOTES TO THE UNAUDITED INTERIM CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Note 1. The Group

Note 1.1. Information on the Group and its business

ABIVAX SA (the “Company”) is a société anonyme incorporated under the laws of France on December 4, 2013. Its registered office

is located at 7-11 Boulevard Haussmann—75009 Paris, France. The Company is developing therapeutics designed to harness the

body’s natural regulatory mechanisms to stabilize the immune response in patients with chronic inflammatory diseases.

These unaudited interim condensed consolidated financial statements as of and for the three- and six-month periods ended June 30,

2026 comprise the Company and ABIVAX LLC (the “Subsidiary”), the United States subsidiary of ABIVAX SA, created on March

20, 2023 under the laws of the State of Delaware (together referred to as the “Group”).

The Group has incurred losses since its inception and had shareholders’ equity of €366,266 thousand as of June 30, 2026. The Group

anticipates incurring additional losses until such time, if ever, that it can generate significant revenue from its drug candidates which

are currently under development. Substantial additional financing will be needed by the Group to fund its operations and to

commercially develop its drug candidates, if approved. See note 3.3. Subsequent event.

The Group's future operations are highly dependent on a combination of factors, including: (i) the success of its research and

development activities; (ii) regulatory approval and market acceptance of its proposed future products; (iii) the timely and successful

completion of additional financing and (iv) the development of competitive therapies by other biotechnology and pharmaceutical

companies. As a result, the Group is, and expects to continue to be, in the short to mid-term, financed through the issuance of new

equity or debt instruments.

The Group is focusing its efforts on the following points:

•Preparing a New Drug Application (“NDA”) submission to the U.S. Food and Drug Administration (“FDA”) for obefazimod

in moderately to severely active ulcerative colitis (“UC”) and potential commercialization in the U.S., if approved.

•Continuation of the Phase 2b clinical trial (ENHANCE-CD) of obefazimod in Crohn’s disease (“CD”).

•Evaluating combination therapy candidates with obefazimod in inflammatory bowel diseases ("IBD").

•Selecting a follow-on candidate for obefazimod.

Note 1.2. Date of authorization of issuance

The unaudited interim condensed consolidated financial statements and related notes have been prepared under the responsibility of

management of the Group and were approved and authorized for issuance by the Group’s board of directors on September 18, 2026.

Note 2. Basis of preparation

Except for share data and per share amounts, the unaudited interim condensed consolidated financial statements are presented in

thousands of euros. Amounts are rounded up or down the nearest whole number for the calculation of certain financial data and other

information contained in these accounts. Accordingly, the total amounts presented in certain tables may not be the exact sum of the

preceding figures.

F-8

Statement of compliance

These unaudited interim condensed consolidated financial statements as of June 30, 2026 and for the three- and six-month periods

ended June 30, 2026 and 2025 have been prepared in accordance with IAS 34 “Interim Financial Reporting” as issued by the

International Accounting Standards Board ("IASB") and as adopted by the European Union (EU) and should be read in conjunction

with the latest Group’s annual financial statements for the years ended December 31, 2023, 2024 and 2025, prepared in accordance

with the International Financial Reporting Standards ("IFRS") as issued by IASB and as adopted by the EU.

They do not include all the information required for a complete set of financial statements prepared under IFRS. They do, however,

include selected notes explaining significant events and transactions in order to understand the changes in the Group’s financial

position and performance since the last annual financial statements.

The accounting policies used to prepare these unaudited interim condensed financial statements are identical to those applied by the

Group as of December 31, 2025, except for:

•the texts whose application is compulsory as from January 1, 2026;

•the specific provisions of IAS 34 used in the preparation of the unaudited interim condensed consolidated financial

statements.

The Group applied the following amendments that are effective for annual reporting periods beginning on or after January 1, 2026:

•IFRS 9 Financial Instruments and IFRS 7 Financial Instruments: Disclosures – Amendments to the Classification and

Measurement of Financial Instruments.

The amendments clarify the timing of recognition and derecognition of financial assets and financial liabilities and introduce

a derecognition exception that permits an entity to derecognize a financial liability before settlement date when the financial

liability is settled with cash, using an electronic payment system that meets specific criteria. Adopting the amendments

resulted in a change in the Group's accounting policy only for the derecognition of financial liabilities settled with cash using

qualifying electronic payment systems, for which the Group has elected to apply the exception.

The change in accounting policy did not have a material effect on the Group’s unaudited interim condensed consolidated

financial statements for the periods presented.

The other additional disclosures introduced by the amendments in relation to (i) investments in equity instruments designated

at fair value through other comprehensive income ("FVOCI") and (ii) financial instruments not measured at fair value

through profit or loss ("FVTPL") with certain contingent features are not applicable to the Group.

•IFRS 9 Financial Instruments and IFRS 7 Financial Instruments: Disclosures – Contracts Referencing Nature-dependent

Electricity.

The Group assessed that the application of these issued accounting pronouncements has no impact on the financial

statements.

The standards and interpretations not yet mandatory as of June 30, 2026 are the following:

•IFRS 18 Presentation and Disclosure in Financial Statements, whose application is for annual reporting periods beginning on

or after January 1, 2027, as approved by the EU on February 16, 2026;

•IFRS 19 Subsidiaries without Public Accountability: Disclosures, and the Amendments (issued on August 21, 2025) whose

application is for annual reporting periods beginning on or after January 1, 2027 (not yet approved by the EU);

•IAS 21 The Effects of Changes in Foreign Exchange Rates: Translation to a Hyperinflationary Presentation Currency, whose

application is for annual reporting periods beginning on or after January 1, 2027 (not yet approved by the EU);

•IFRS 20 Regulatory Assets and Regulatory Liabilities (issued on May 27, 2026) whose application is for annual reporting

periods beginning on or after January 1, 2029 (not yet approved by the EU), and

•IAS 28 Investments in Associates and Joint Ventures: Amendments to the Fair Value Option, whose application is for annual

reporting periods beginning on or after January 1, 2027 (not yet approved by the EU).

These texts have not been early adopted. The application of the standards and interpretations issued respectively by the IASB and the

IFRS IC that are not yet effective as of June 30, 2026 is not expected to have a material impact on the Group’s consolidated financial

statements. IFRS 18, issued in April 2024 and effective from January 1, 2027, will modify the presentation of the Consolidated

statements of income (loss) and the Consolidated statements of cash flows.

F-9

Preparation of the financial statements

The unaudited interim condensed consolidated financial statements of the Group were prepared on a historical cost basis, with the

exception of certain asset and liability categories and in accordance with the provisions set out in IFRS such as employee benefits

measured using the projected unit credit method, the Heights notes (classified under "Convertible loan notes") measured at fair value

and derivative financial instruments measured at fair value and certain investments classified under "Cash and equivalents" measured

at fair value.

Going concern

The Group has incurred substantial operating losses since inception and expects to continue to incur significant operating losses for the

foreseeable future and may never become profitable. For the six-month period ended June 30, 2026, the Group had a net loss of

€165.9 million

Since inception, the Group has financed its operations through the issuance of ordinary shares with gross aggregate proceeds of

€2,002.1 million, of which €130 million of gross proceeds were from offerings of its ordinary shares on Euronext Paris in February

2023, €223.3 million of gross proceeds were from its offering of ordinary shares in the form of American Depository Shares ("ADS")

on the Nasdaq Global Market as well as ordinary shares in Europe (including France) and countries outside of the United States in a

private placement in October 2023, €637.5 million of gross proceeds were from the offering of ordinary shares in the form of ADSs on

the Nasdaq Global Market in July 2025 (the “2025 Offering”) and €807.4 million of gross proceeds were from the offering of ordinary

shares in the form of ADSs on the Nasdaq Global Market in July 2026 (the “2026 Offering”), bank borrowings and structured loans

for €175.0 million, reimbursements of Research Tax Credits (Crédit d’Impôt Recherche (“CIR”)) in an amount of €41.2 million,

grants received from Banque Publique d’Investissement (“Bpifrance”) (including €17.1 million of subsidies and €1.8 million of

conditional advances) and royalty certificates in an amount of €2.9 million.

Based on (a) the Group’s existing cash and cash equivalents and other short-term investments of €402.4 million as of June 30, 2026

and (b) the net proceeds from the July 2026 Offering of €767.1 million, the Group expects, as of the date of issuance of these financial

statements, to be able to fund its forecasted cash flow requirements as they fall due for at least 12 months from the date these

consolidated financial statements were authorized for issuance.This reflects continued investment in the extension of the Phase 3

clinical program for obefazimod in UC, the advancement of the Phase 2b ENHANCE-CD clinical trial in CD, with expected 12-week

induction topline results in mid-2027, the planned submission of an NDA for obefazimod in UC in the fourth quarter of 2026, and the

continued buildout of the U.S. commercial organization in preparation for a potential commercial launch of obefazimod in UC, if

approved. The Group’s forecasted cash flow requirements also include ongoing general and administrative expenses, working capital

requirements and other operating activities necessary to support its business.

Based on the above, these financial statements have been prepared on a going concern basis.

Note 3. Significant events for the year ended December 31, 2025 and the six-month period ended June 30, 2026 and subsequent

events

Note 3.1. For the year ended December 31, 2025

Share-based compensation plans– January-November 2025

In January 2025, the Group granted its independent Board members, as well as one of its Board Observers and Advisor, the right to

subscribe up to 125,000 share warrants (BSA) in the aggregate, the vesting of which (if subscribed) is subject to a service condition of

four years, by tranches of 25% each, vested on January 1 of each year.

In February, March, May, August and November 2025, the Group issued eight free-share compensation plans to certain of its officers

and employees, representing a maximum of 6,280,727 shares in the aggregate, the vesting of which is subject to the following service

condition: 50% of the AGAs vest at the end of a two-year period from the allocation date, 25% at the end of a three-year period from

the allocation date and 25% at the end of a four-year period from the allocation date (with the exception of the 123,102 2025-2 AGAs,

which vest at the end of a two-year period from the allocation date, and the 50,000 2025-5 AGAs , which vest only upon the

F-10

achievement of milestones related to clinical studies). Moreover, the vesting of almost half of the 4,319,500 2025-1 AGAs is subject to

the occurrence of a tender offer on the securities issued by the Group and resulting in a change of control of the Group before a certain

date.

In April 2025, the Group granted to one of its Board members the right to subscribe up to 39,370 share warrants (BSA), the vesting of

which is subject to a service condition of four years, by tranches of 25% each, vested on May 1 of each year. The BSAs were

subscribed in May 2025.

The detailed terms and conditions of these plans are set forth in Note 14.

Change in management – April 2025

On April 22, 2025, the Group announced the appointment of Dominik Höchli, MD to the Board of Directors of Abivax, effective

immediately.

Completion of enrollment for the Phase 3 ABTECT trials in patients with moderately to severely active UC - April 2025

On April 29, 2025, the Group announced the completion of enrollment for the Phase 3 ABTECT trials in patients with moderately to

severely active UC.

Publication of positive Phase 3 results from both ABTECT 8-week induction trials investigating obefazimod, in moderate to severely

active UC – July 2025

On July 22, 2025, the Group announced the positive results of the ABTECT-1 and ABTECT-2 induction trials in patients with

moderately to severely active UC. ABTECT-1 and 2 are global, multicenter, randomized, double-blind, placebo-controlled trials

assessing once-daily oral administration of obefazimod at 25 mg or 50 mg doses in adult patients with moderately to severely active

UC. Eligible participants had inadequate response, loss of response, or intolerance to conventional and/or advanced therapies.

Following this announcement and that of its Offering completed on July 28, 2025 (see Completion of a public offering – July 2025

within this section), the Group’s share price increased significantly, from €6.64 as of June 30, 2025, to €57.00 as of July 28, 2025.

At the same time, the Group reassessed the probability of success (“POS”) of obtaining a future market authorization for obefazimod

in UC, to reflect a reduced level of uncertainty following positive Phase 3 results.

The main financial effects of this event on the Group’s financial statements are the following:

•A significant increase in the carrying value of the royalty certificates, measured at amortized cost, reflecting an increase in the

projected probability-weighted cash flows of the instrument, following the reassessment of the POS (see Note 15.5),

•Significant changes in the carrying value of the Group’s financial liabilities measured at fair value through profit or loss, i.e.

the Kreos / Claret BSA, the Kreos / Claret MRI and the Heights convertible notes (the latter as well as the Kreos / Claret BSA

being converted into ordinary shares at the request of the noteholders in July and August 2025, see Conversion of the Heights

convertible notes, Kreos OCABSA and Kreos / Claret BSA and prepayment of the Kreos / Claret Tranches B and C bond

loans – July-December 2025 belowand Notes 15.1 and 15.2),

•Significant changes in the disclosure of the fair values of other financial instruments measured at amortized cost (i.e. the

royalty certificates, the debt components of (i) the Kreos / Claret OCABSA (Tranche A, converted into shares in August

2025) and (ii) Tranche B and C bond loans; these fair value changes are not expected directly to impact the future financial

position and net loss of the Group - see Note 15),

•A significant increase in provisions related to employer contributions on AGAs (the contribution being based on the vesting

date share price - see Note 14).

F-11

Completion of a public offering – July 2025

On July 28, 2025, the Group announced the completion of an underwritten public offering of 11,679,400 ADSs (the “2025 Offering”)

at a price of $64.00 per ADS (corresponding to €54.58 per ordinary share, based on the exchange rate of €1.00 = $1.1726 as published

by the European Central Bank on July 23, 2025). The aggregate gross proceeds amounted to approximately $747.5 million, equivalent

to approximately €637.5 million, before deduction of underwriting commissions and estimated expenses, and the net proceeds, after

deducting underwriting commissions and estimated offering expenses, were approximately $700.3 million, equivalent to

approximately €597.2 million. The net cash from the 2025 Offering of €608.1 million presented within the Unaudited Condensed

Interim Statements of Cash Flows also includes the effect of a net foreign exchange gain resulting from the favorable change in the

euro to U.S. dollar exchange rate between the closing of the 2025 Offering and the date of receipt of funds.

Conversion of the Heights convertible notes, Kreos OCABSA and Kreos / Claret BSA and prepayment of the Kreos / Claret Tranches

B and C bond loans – July-December 2025

On July 23 and July 30, 2025, the Group received notices from entities affiliated with Heights Capital Management, which hold

amortizing senior convertible notes of the Group issued in August 2023 (the “Height convertible notes”), for the immediate conversion

of respectively 150 and 200 convertible notes (corresponding to the entirety of the outstanding principal amount of €21.9 million) into

920,377 new ordinary shares of the Group at a conversion price of €23.7674 per ordinary share in accordance with the terms and

conditions of the convertible notes.

On August 8, 2025, Kreos Capital VII (UK) Limited converted its portion of the Tranche A of the Kreos / Claret Financing (the Kreos

OCABSA), resulting in the issuance of 785,389 ordinary shares. In addition, on July 30, 2025 Kreos Capital VII Aggregator SCSp

exercised its share warrants (the tranche A-B BSA and tranche C BSA) resulting in the issuance of 319,251 ordinary shares of the

Group.

On August 28, 2025, Claret European Growth Capital Fund III SCSp exercised its share warrants (the tranche A-B BSA and tranche C

BSA) resulting in the issuance of 206,662 ordinary shares of the Group.

On November 25, 2025, Claret European Growth Capital Fund III SCSp converted its portion of the Tranche A portion of the Kreos /

Claret Financing (the Claret OCABSA), resulting in the issuance of 392,695 ordinary shares of the Group.

On December 23, 2025, the Group completed the full prepayment of the outstanding balances of Tranches B and C of the Kreos /

Claret Financing. The repayment amount, including end-of-loan exit fees and prepayment fees, amounts to 33,823 thousand.

Following these transactions, the Group no longer holds any debt related to the Kreos / Claret and Heights Financings.

The impacts of these operations on the Group's financial statements are set forth in Note 15.1 and 15.2.

Admission to the CAC Mid 60 and SBF 120 indices - September 2025

Following the annual review of the Euronext Paris indices on September 11, 2025, the Scientific Council of the Indices has decided to

admit the Company to the CAC Mid 60 and SBF 120 indices. This decision took effect on Friday, September 19, 2025, after market

close. The CAC Mid 60 and SBF 120 are key indices on the Euronext Paris exchange, representing mid-sized listed companies and a

broader selection of 120 major securities, respectively.

Note 3.2. For the six-month period ended June 30, 2026

F-12

Share-based compensation plans– February, March and May 2026

In February, March and May 2026, certain of the Group's officers and employees were allocated 47,500 AGAs (AGA plan 2026-1),

294,476 (AGA plan 2026-2), 1,619 (AGA plan 2026-3) and 41,717 (AGA plan 2026-4), the vesting of which is subject to the

following service condition: 50% of the AGAs vest at the end of a two-year period from the allocation date, 25% at the end of a three-

year period from the allocation date and 25% at the end of a four-year period from the allocation date.

In February 2026, the Group granted its independent Board members, as well as a board observer and advisor, the right to subscribe up

to 23,477 share warrants (BSA) in the aggregate, the vesting of which is subject to a service condition of four years, by tranches of

25% each, vested on each February 1st thereafter. The BSAs were subscribed in February 2026.

Changes in management - March 2026

In March 2026, the Group appointed Michael Nesrallah, MBA, as Chief Commercial Officer, Keith Fournier, Ph.D., as Senior Vice

President of Global Regulatory Affairs, and Maurus de la Rosa, Ph.D., Senior Vice President of Research.

In March 2026, Sofinnova Partners, represented by Dr. Kinam Hong, stepped down from the Group's Board of Directors.

In light of Dr. Didier Scherrer's departure from his role as Chief Scientific Officer, the Group entered into a settlement agreement

("protocole d’accord transactionnel") with Dr. Didier Scherrer in March 2026 under which:

•Dr. Scherrer received a balance of notice pay in the total gross amount of €278 thousand, together with a contractual

severance indemnity of €240 thousand (net);

•the Group waived the continued employment condition attached to 77,050 free shares previously granted to Dr. Scherrer;

•the Group waived the continued employment condition for a further 40,200 free shares, subject to specific performance

conditions;

•the remaining 217,750 free shares previously granted to Dr. Scherrer are lapsed; and

•Dr. Scherrer irrevocably waived all claims and renounced any legal action against the Group.

The accounting treatment of this transaction is set forth in Note 14.

Repurchase of royalty certificates– May 2026

On May 4, 2026, the Group entered into a purchase agreement with the holders of its royalty certificates (TCG Crossover Fund I, L.P.,

VHCP ABVX Holdings, LLC, Deep Track Biotechnology Master Fund, Ltd., Sofinnova Crossover I SLP, Invus Public Equities, L.P.,

FPCI BioMedTech and Santé Holdings Srl, together referred to as the “Holders”). Pursuant to the agreement, the Holders agreed to

sell, and the Group agreed to purchase, all of the royalty certificates for a purchase price equal to $90 million (equivalent to

approximately€76.5 million), of which $45 million was paid in cash on May 7, 2026.

The Holders granted the Group an interest-free vendor’s loan ("crédit vendeur") in a total amount equal to the remaining $45 million,

to be reinvested in the Group's securities by way of set off against the subscription price of 403,347 ordinary shares in the form of

ADSs to be issued by the Group to the Holders, at an offering price of $111.57 per ADS (corresponding to €95.34 per ordinary share,

based on the exchange rate of €1.00 = $1.1702 as published by the European Central Bank on April 30, 2026). The set-off and the

corresponding issuance and delivery of the ADSs to the Holders occurred on May 7, 2026. The vendor's loan was fully extinguished at

that date.

The royalty certificates repurchased by the Group were immediately cancelled by the Group.

The impact in profit or loss of the repurchase of the royalty certificates on May 7, 2026 resulted in an expense of €43.2 million,

which was recognized in the second quarter of 2026. The amount corresponds to the difference between the certificates' carrying

amount on the repurchase date of €33.5 million and the total consideration transferred, comprising a gross equity consideration of

€38.5 million and a cash consideration of €38.2 million, based on the exchange rates prevailing at the capital increase date and the

cash settlement date (including the €0.2 million effect of a net foreign exchange loss on the cash settlement). Consequently, the

€6.1 million deferred tax liability recognized in the Group's statements of financial position as of March 31, 2026 was derecognized,

and a corresponding tax income was recognized, for the six-month period ended June 30, 2026 (see Note 22). Transaction costs

amounting to €1.0 million were accounted for as a deduction from shareholders' equity.

F-13

On May 7, 2026, the Group filed a prospectus supplement to its effective shelf registration statement on Form F-3ASR filed with the

Securities and Exchange Commission on July 23, 2025, for the purpose of registering for resale up to 403,347 ADSs held by the

Holders.

Note 3.3. Subsequent events

Completion of a public offering – July 2026

On July 6, 2026, the Group announced the completion of an underwritten public offering of 7,360,000 ADSs (the “2026 Offering”),

each representing one ordinary share of the Group, which includes the full exercise of the underwriters’ option to purchase additional

ADSs, at a price of 125.00 per ADS (corresponding to €109.71 per ordinary share, based on the exchange rate of €1.00 = $1.1394 as

published by the European Central Bank on June 30, 2026). The aggregate gross proceeds amounted to approximately $920.0 million,

equivalent to approximately €807.4 million, before deduction of underwriting commissions and estimated expenses, and the net

proceeds, after deducting underwriting commissions and estimated offering expenses, were approximately $874.1 million, equivalent

to approximately €767.1 million.

The Group believes that the net proceeds from the 2026 Offering, together with its current cash and cash equivalents, will allow it to

finance its forecasted cash flow requirements as they fall due for at least 12 months from the date these consolidated financial

statements were authorized for issuance (see Note 2 above "Going concern").

Changes in management – July 2026 and September 2026

In July 2026, the Group appointed James Berger as Global Head of Marketing, Ivan Nuñez-Pacheco as Global Head of Patient

Services, Heather Dean as Global Head of Sales, Accounts & Commercial Operations and Jeff Haas as Global Head of Market Access

& Pricing. These additions strengthen the Group's commercial organization as the Group prepares for the potential U.S.

commercialization of obefazimod, including a planned NDA submission to the FDA in the fourth quarter of 2026.

In September 2026, the Group announced that Fabio Cataldi, M.D., Chief Medical Officer, will be leaving the Group in the fourth

quarter of 2026. Chris Rabbat, Ph.D., who has led Global Medical Affairs since 2023, will succeed Dr. Cataldi as Chief Medical

Officer, leading the medical organization as the Group advances toward potential commercialization. Dr. Rabbat bring extensive

biopharmaceutical industry experience, including deep expertise in IBD and experience supporting therapies through

commercialization and launch. Dr. Rabbat's appointment is effective immediately.

In September 2026, the Group has also appointed Tim Kelly as Chief Technical Officer. Mr. Kelly will lead the Company's CMC,

Quality and Information Technology functions, further strengthening the infrastructure supporting the Group continued growth and

potential transition to a commercial-stage organization. Most recently, Mr. Kelly served as the Chief Technical Officer of Caribou

Biosciences and previously held senior leadership roles at Oxford Biomedica Solutions, Homology Medicines, Shire, UCB Pharma

and Biogen. Mr Kelly's appointment is effective immediately.

Share-based compensation plans– July and September 2026

In July 2026, certain of the Group's officers and employees were allocated 25,620 AGAs (AGA plan 2026-5), the vesting of which is

subject to the following service condition: 50% of the AGAs vest at the end of a two-year period from the allocation date, 25% at the

end of a three-year period from the allocation date and 25% at the end of a four-year period from the allocation date.

In September 2026, certain of the Group's officers and employees were allocated 45,551 AGAs (AGA plan 2026-6), the vesting of

which is subject to the following service condition: 50% of the AGAs vest at the end of a two-year period from the allocation date,

25% at the end of a three-year period from the allocation date and 25% at the end of a four-year period from the allocation date.

F-14

Note 4. Accounting principles

The Group's accounting policies are the same as those described in the annual consolidated financial statements of the Group as of

December 31, 2025 accompanying the Company’s Annual Report on Form 20-F for the year ended December 31, 2025 (the “Annual

Report”), with the exception of the change in accounting policy implemented following the application of the Amendments to IFRS 9

Financial Instruments and IFRS 7 Financial Instruments: Disclosures – Amendments to the Classification and Measurement of

Financial Instruments (see Note 2). Under the new accounting policy, the Group derecognises financial liabilities on the settlement

date. However, for certain financial liabilities settled with cash using electronic payment systems, the Group applies an exception on a

system-by-system basis to derecognise financial liabilities earlier. For these liabilities, derecognition occurs when the Group’s ability

to withdraw, stop or cancel the payment instruction is surrendered and the other eligibility criteria are met.

Use of judgments and estimates

In preparing these unaudited condensed consolidated financial statements, management has made judgments and estimates that affect

the application of the Group’s accounting policies and the reported amounts of assets and liabilities, income and expenses. Actual

values may differ from estimated values.

The significant judgments made by management in the application of the Group’s accounting policies and the key sources of

estimation uncertainty are the same as those described in the annual consolidated financial statements of the Group as of December 31,

2025 accompanying the Annual Report.

Measurement of fair values

A number of the Group’s accounting policies require the measurement of fair values, for both financial and non-financial assets and

liabilities.

When measuring the fair value of an asset or a liability, the Group uses market observable data as far as possible. Fair values are

categorized into different levels in a fair value hierarchy based on the inputs used in the valuation techniques as follows.

•Level 1: quoted prices (unadjusted) in active markets for identical assets or liabilities.

•Level 2: inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly

(i.e., prices) or indirectly (i.e., derived from prices).

•Level 3: inputs for the asset or liability that are not based on observable market data (unobservable inputs).

Seasonality of operations

The Group’s operations are not subject to significant seasonality.

Note 5. Segment information

The assessment of the Group’s performance and the decisions about resources to be allocated are made by the chief operating decision

maker, based on the management reporting system of the Group. The Group identified the Chief Executive Officer of the Group as

“Chief operating decision maker”. The Chief operating decision maker reviews on an aggregated basis the incurred expenses for

allocating and evaluating performance of the Group.

The Group operates in a single operating segment: R&D of pharmaceutical products in order to market them in the future.

Substantially all operations, assets, liabilities, and losses of the Group are located in France. As of June 30, 2026, the Subsidiary’s

contributions to the Group’s liabilities and net losses were less than 10% and its contribution to the Group's assets were 22.2%

(consisting predominantly of cash and cash equivalents).

F-15

Note 6. Goodwill and impairment test

Goodwill relates to the acquisition of Splicos SAS that occurred in 2014 (i.e., prior to the transition date to IFRS) which was merged

into the Group the same year.

Goodwill from the Splicos SAS acquisition corresponds to the “Modulation of RNA biogenesis / splicing” technological platform,

from which derived the lead drug candidate of the Group: obefazimod.

In accordance with IAS 36, goodwill is allocated to groups of cash generating units (CGUs) at a level corresponding to the lead drug

candidates. Thus, goodwill from Splicos SAS is allocated to obefazimod.

The net carrying amount of Splicos SAS goodwill is €18,419 thousand as of December 31, 2025 and June 30, 2026.

Obefazimod is currently in clinical development, so a clinical trial failure or a failure to obtain a marketing approval could result in an

impairment. As of June 30, 2026, the Group has not identified any indication of impairment loss related to goodwill, intangible or

tangible assets.

Note 7. Intangible assets

Intangible assets are mainly comprised of the intellectual property underlying:

(i)The collaboration and license agreement with the French National Centre for Scientific Research (CNRS), Montpellier 2

University and the Curie.

(ii)Patents acquired through the acquisition of Prosynergia of €6,529 thousand. The patents are not yet amortized, similarly

to licenses, and are included in obefazimod CGU for impairment test purposes.

Licenses and patents recognized as Intangible assets are not amortized since they are not operating in a manner intended by the

management. As a consequence, and in accordance with IAS 36, those assets were subject to an annual impairment test as of

December 31, 2025, which did not result in any impairment loss. As of June 30, 2026, no indicator of impairment has been identified.

F-17

Note 8. Property, plant and equipment

The following tables present changes in property, plant and equipment including the right of use of assets (or “ROU”) as of June 30,

2025 and 2026:


(amounts in thousands of euros)	BUILDINGS		EQUIPMENT		FURNITURE AND COMPUTER EQUIPMENT		TOTAL		OF WHICH ROU
GROSS VALUES

AS OF DECEMBER 31, 2024	2,818	—	513		698		4,029		2,526
Acquisition	80		—		26		106		52
Disposal	—		(16)		(39)		(54)		(20)
Effect of the change in foreign currency exchange rates	(49)		—		(11)		(61)		(49)
AS OF JUNE 30, 2025	2,849	—	497	—	673	0	4,020	0	2,508

AS OF DECEMBER 31, 2025	3,204		463		607		4,274		2,865
Acquisition	5		11		152		168		—
Effect of the change in foreign currency exchange rates	12		—		4		16		12
AS OF JUNE 30, 2026	3,221		474		763		4,457		2,877


(amounts in thousands of euros)	BUILDINGS		EQUIPMENT		FURNITURE AND COMPUTER EQUIPMENT		TOTAL	OF WHICH ROU
DEPRECIATION
AS OF DECEMBER 31, 2024	(613)		(419)		(332)		(1,363)	(575)
Increase	(452)		(19)		(102)		(573)	(422)
Disposal	—		16		39		54	20
Effect of the change in foreign currency exchange rates	16		—		5		21	16
AS OF JUNE 30, 2025	(1,048)	—	(422)	—	(390)	0	(1,860)	(961)

AS OF DECEMBER 31, 2025	(1,498)		(404)		(281)		(2,184)	(1,302)
Increase	(627)		(17)		(97)		(741)	(559)
Effect of the change in foreign currency exchange rates	(9)		—		(2)		(11)	(9)
AS OF JUNE 30, 2026	(2,135)		(420)		(380)		(2,935)	(1,870)


(amounts in thousands of euros)	BUILDINGS	EQUIPMENT	FURNITURE AND COMPUTER EQUIPMENT	TOTAL	OF WHICH ROU
NET BOOK VALUES
AS OF JUNE 30, 2025	1,801	75	283	2,159	1,547
AS OF DECEMBER 31, 2025	1,706	59	325	2,090	1,563
AS OF JUNE 30, 2026	1,086	54	382	1,522	1,007

Right of use assets relate to buildings and furniture. The net book value of right of use assets related to buildings amounted to€1,489

thousandas of June 30, 2025, €1,473 thousand as of December 31, 2025 and €927 thousand as of June 30, 2026.

F-18

As of June 30, 2026, no indicator of impairment has been identified.

Note 9. Other financial assets

Other financial assets break down as follows:


(amounts in thousands of euros)	AS OF DECEMBER 31, 2025	AS OF JUNE 30, 2026
OTHER FINANCIAL ASSETS
Advances related to CRO contracts	4,665	4,755
Deposits	693	705
Total other non-current financial assets	5,358	5,460
Advances related to CRO contracts	7,717	7,872
Receivable from Citibank	—	429
Other investments	13,698	14,390
Total other current financial assets	21,415	22,692
Other financial assets	26,772	28,152

Advances related to CRO contracts

These advances granted in 2022 for a total undiscounted amount of €12,187 thousand for clinical studies are to be recovered at the end

of the studies after final reconciliation with pass-through costs, which are being invoiced and paid as studies are carried out. These

long-term advances were measured at fair value on initial recognition, using discount rates ranging from 0.19% to 7.16%, and are

subsequently measured at amortized cost. The recovery dates of the first two advances are scheduled in 2026.

During the first half of 2023, additional advances related to CRO contracts amounting to €1,620 thousand were made (undiscounted

amount). These long-term advances were measured at fair value on initial recognition, using discount rates ranging from 7.09% to

7.59%, and are subsequently measured at amortized cost.

At inception, a prepaid expenses asset was recognized for the difference between the advances’ nominal value and fair value, and

spread over the term of the advances, at the rate of recognition of the related R&D expenses (see Note 10).

In March 2024, a change order was signed with the CRO, extending the scope (addition of maintenance studies) and end date of one of

the studies to 2029, thus postponing the recovery date of the corresponding advance of €5,538 thousand from June 2026 to June 2029.

The Group considered that this asset modification met the criteria for derecognition, and recognized a new financial asset at fair value

on that date, using a discount rate of 6.83%. Since the Group considers that these advances are made in exchange for a discount on

future services to be received from the CROs, a prepaid expense asset was also recognized for the difference between the

derecognized asset carrying value and new asset fair value, and spread over the term of the advance (equal to the period of service) in

a similar manner.

As of June 30, 2026, the recovery dates of these advances are spread from the second half of 2026 to 2030.

The credit risk related to these advances is deemed insignificant due to the CROs' credit ratings.

Other investments

Other investments consist of 9-month and 12-month term deposits that do not qualify for a classification under cash and cash

equivalents.

Deposits

Deposits include amounts related to the Paris and Boston offices lease contracts, the ATM Program, as well as other security deposits.

F-19

Note 10. Other receivables and assets

Other receivables and assets break down as follows:


(amounts in thousands of euros)	AS OF DECEMBER 31, 2025	AS OF JUNE 30, 2026
OTHER RECEIVABLES AND ASSETS
Research tax credit ("CIR")	—	2,137
Prepaid expenses	625	441
Total non-current other receivables and assets	625	2,579
Research tax credit ("CIR")	3,196	3,174
VAT receivables	6,870	8,134
Prepaid expenses	2,649	4,392
Employee-related receivables	429	872
Credit notes	—	243
Other	—	126
Total current other receivables and assets	13,144	16,941
Other receivables and assets	13,769	19,520

Research tax credit (“CIR”)

The CIR is recognized as Other Operating Income in the year to which the eligible research expense relates. The Group received the

payment for the CIR for the 2024 tax year of €5,640 thousand in June 2025 and received payment for the CIR for the 2025 tax year of

€3,174 thousand in August 2026.The additional CIR of €2,137 thousand recorded over the six-month period ended June 30, 2026

relates to research expenses incurred during the period.

Prepaid expenses

Prepaid expenses as of June 30, 2026 include prepaid expenses related to CRO contracts for an amount of €441 thousand (see Note 9),

expenses related to capital increases of€888 thousand (contributing to the increase in the balance compared to December 31, 2025),

and other expenses from various suppliers amounting to €3,512 thousand.

F-20

Note 11. Cash and cash equivalents

Cash and cash equivalents break down as follows:


(amounts in thousands of euros)	AS OF DECEMBER 31, 2025	AS OF JUNE 30, 2026
CASH AND CASH EQUIVALENTS
Cash equivalents	478,541	218,055
Cash	38,144	169,936
Cash and cash equivalents	516,685	387,992

Cash equivalents mainly include term deposits with short-term maturities and highly liquid investments in mutual funds (measured at

amortized cost) and highly liquid investments in mutual funds and structured notes (measured at fair value through profit or loss)

denominated in euros and U.S. dollars. Cash equivalents include the invested proceeds from the 2025 Offering.

As of December 31, 2025 and June 30, 2026, in addition to the Group’s bank accounts, cash includes notice accounts and demand

deposit accounts amounting to €5,744 thousand and €66,120 thousand, respectively. These funds are available on demand within 24

hours and without penalty.

As of December 31, 2025 and June 30, 2026, the impact of the revaluation of cash and cash equivalents held in U.S. dollars into the

Company's functional currency is a net financial expense of €8,639 thousand and a net financial gain of €2,736 thousand, respectively.

F-21

Note 12. Financial assets and liabilities

The following table shows the carrying amounts and fair value of financial assets and financial liabilities, including their

levels in the fair value hierarchy.

Tax and employee-related payables are non-financial liabilities and are therefore excluded from the tables below. They are

presented in Note 17.2.


			AS OF DECEMBER 31, 2025
(amounts in thousands of euros)	AMOUNT RECOGNIZED IN THE STATEMENT OF FINANCIAL POSITION	FAIR VALUE	ASSETS/ LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS	ASSETS AT AMORTIZED COST	LIABILITIES AT AMORTIZED COST
Other financial assets (2)	26,772	27,141	—	27,141	—
Other receivables and assets (2)	13,769	13,769	—	13,769	—
Cash and cash equivalents (1)	516,685	516,685	437,031	79,654	—
Total financial assets	557,226	557,595	437,031	120,565	—
Financial liabilities—non-current portion (4, Note 15)	30,790	102,555	—	—	102,555
Financial liabilities—current portion (3, Note 15)	1,302	1,302	—	—	1,302
Trade payables and other current liabilities (3)	37,552	37,552	—	—	37,552
Total financial liabilities	69,644	141,409	—	—	141,409


			AS OF JUNE 30, 2026
(amounts in thousands of euros)	AMOUNT RECOGNIZED IN THE STATEMENT OF FINANCIAL POSITION	FAIR VALUE	ASSETS/ LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS	ASSETS AT AMORTIZED COST	LIABILITIES AT AMORTIZED COST
Other financial assets (2)	28,152	28,057	—	28,057	—
Other receivables and assets (2)	19,520	19,520	—	19,520	—
Cash and cash equivalents (1)	387,992	387,992	166,055	221,936	—
Total financial assets	435,663	435,568	166,055	269,513	—
Financial liabilities—non-current portion (Note 15)	137	137	—	—	137
Financial liabilities—current portion (3, Note 15)	1,075	1,075	—	—	1,075
Trade payables and other current liabilities (3)	39,010	39,010	—	—	39,010
Total financial liabilities	40,222	40,222	—	—	40,222

(1) The fair value of cash and cash equivalents is determined based on Level 1 fair value measurement and corresponds to the

market value of the assets.

(2) The carrying amount of financial assets measured at amortized cost is deemed to be a reasonable estimate of fair value, except

for the long-term advances made to CROs, whose fair value is determined based on Level 3 fair value measurement and is estimated

based on future cash-flows discounted at market rates, using credit spreads ranging from 34 bp to 131 bp as of December 31, 2025 and

34 bp to 81 bp as of June 30, 2026. As of December 31, 2025 and June 30, 2026, an increase in the credit spread by +100 bp would

result in a decrease in the advances fair value by €231 thousand and €202 thousand respectively.

(3) The carrying amount of current financial liabilities measured at amortized cost, including Trade payables and other current

liabilities, was deemed to be a reasonable estimate of fair value.

F-22

(4) The fair value of the royalty certificates, is based on Level 3 fair value measurement and is estimated based on models and

assumptions detailed in Note 15.

Note 13. Shareholders’ equity

Note 13.1. Share capital issued

The Group manages its capital to ensure that it will be able to continue as a going concern while maximizing the return to

shareholders through the optimization of the debt and equity balance.

As of June 30, 2026, the Group's share capital amounted to €798 thousand divided into 79,817,069 ordinary shares issued with a

par value of €0.01 each, fully paid up, after taking into account the various capital increases that took place since inception.

Share capital does not include founders’ share subscription warrants (“bons de souscription de parts de créateur d’entreprise” or

“BCE”), share subscription warrants (“Bons de souscription d’actions,” or “BSA”) and free shares (“Attributions gratuites d’actions,”

or “AGA”) that have been granted to certain natural persons, both employees and non-employees of the Group, but not yet exercised.

The Group held none of its own shares as of December 31, 2025 and June 30, 2026.

The number of outstanding ordinary shares was 78,536,412 and 79,817,069 as of December 31, 2025 and June 30, 2026, respectively.

Note 13.2. Change in share capital

The increase in the share capital for the six months ended June 30, 2026 relates to (i) the issuance, in May 2026, of 403,347 ADSs

subscribed by the royalty certificates Holders at a price of $111.57 per ADS (corresponding to €95.34 per ordinary share, based on the

exchange rate of €1.00 = $1.1702 as published by the European Central Bank on April 30, 2026), as part of the repurchase of the

certificates (see Note 15.5), and (ii) (x) the vesting of 858,370 AGAs, (y) the exercise of 2,540 BCEs and (z) the exercise of 16,400

(See Note 14). BSAs, resulting in the issuance of respectively 858,370, 2,540 and 16,400 ordinary shares (i.e. 877,310 in the

aggregate) with a par value of €0.01 per share.

Distribution of dividends

The Group did not distribute any dividends during any of the periods presented, does not have any present plan to pay any cash

dividends on its equity securities in the foreseeable future and currently intends to retain all available funds and any future earnings to

operate and expand its business.

F-23

Note 14. Share-based payments

The Group has granted BCEs, BSAs and AGAs. These plans qualify as “equity settled” under IFRS 2. The Group does not have any

obligation to purchase these instruments in the event of departure or if a specific event does not occur.

BCEs

The following tables summarize the data relating to BCEs:

TYPE

NUMBER

OF BCEs

ISSUED

NUMBER

OF BCE

OUTSTAND

ING AS OF

JANUARY

1, 2026

NUMBER

OF ISSUED

BCEs

NUMBER

OF LAPSED

BCEs

NUMBER

EXERCISE

D BCEs

NUMBER

OF BCEs

OUTSTAND

ING

NUMBER

OF BCEs

EXERCISA

BLE

MAXIMUM

NUMBER OF

SHARES TO

BE ISSUED IF

ALL

CONDITIONS

ARE MET

FOR THE SIX MONTHS ENDED JUNE

30, 2026

AS OF

JUNE 30, 2026

Total BCEs

390,965

207,679

—

(2,540)

205,139

120,922

205,139

BSAs

The following tables summarize the data relating to BSAs:


TYPE	Total NUMBER OF BSAs ISSUED	NUMBER OF BCE OUTSTAND ING AS OF JANUARY 1, 2026	NUMBER OF ISSUED BSAs	NUMBER OF LAPSED BSAs	NUMBER OF EXERCISE D BSAs	NUMBER OF BSAs OUTSTAND ING		NUMBER OF BSAs EXERCISA BLE		MAXIMUM NUMBER OF SHARES TO BE ISSUED IF ALL CONDITIONS ARE MET
TYPE	Total NUMBER OF BSAs ISSUED	NUMBER OF BCE OUTSTAND ING AS OF JANUARY 1, 2026	FOR THE SIX MONTHS ENDED JUNE 30, 2026			AS OF JUNE 30, 2026
Total BSAs	314,867	253,727	23,477	—	(16,400)	260,804	—	75,136	—	260,804

BSAs granted in February 2026

In February 2026, the Group granted its independent Board members, as well as a Board observer and advisor, the right to subscribe

up to 23,477 BSAs in the aggregate, the vesting of which is subject to a service condition of four years, by tranches of 25% each,

vested on each February 1, thereafter. The BSAs were subscribed in February 2026.

The fair value of the BSAs was determined at grant date using the Black Scholes model, with the following assumptions:

F-24

TYPE

FAIR VALUE

OF THE

UNDERLYING

FAIR VALUE

OF THE BSA

NUMBER OF

BSAs

SUBSCRIPTI

ON PRICE

STRIKE

PRICE PER

RISK FREE

RATE

EXPECTED

MATURITY

VOLATILITY

BSA-2026-1

€99.63

[€77.7-€83.2]

23,477

€20.23

€99.63

3.77%

[5.5-7 years]

99.33%

AGAs

The following tables summarize the data relating to AGAs as well as the assumptions used for the measurement thereof in

accordance with IFRS 2—Share-based Payment:


GRANT DATE	TYPE	Total NUMBER OF AGAs ISSUED	NUMBER OF AGA OUTSTANDING AS OF JANUARY 1, 2026	NUMBER OF ISSUED AGAs	NUMBER OF LAPSED AGAs	NUMBER OF VESTED AGAs	NUMBER OF AGAs OUTSTANDING
GRANT DATE	TYPE	Total NUMBER OF AGAs ISSUED	NUMBER OF AGA OUTSTANDING AS OF JANUARY 1, 2026	FOR THE SIX MONTHS ENDED JUNE 30, 2026			AS OF JUNE 30, 2026
	Total AGAs	11,063,460	8,395,678	502,562	(233,738)	(858,370)	7,806,132


TYPE	FAIR VALUE OF THE UNDERLYING SHARE	FAIR VALUE OF THE AGA	MATURITY	VOLATILITY	RISK FREE RATE
AGA-2026-1	€95.50	€95.50	N/A	N/A	N/A
AGA-2026-2	€106.00	€106.00	N/A	N/A	N/A
AGA-2026-3	€106.00	€106.00	N/A	N/A	N/A
AGA-2026-4	€105.10	€105.10	N/A	N/A	N/A

AGAs granted in February, March and May 2026

In February, March and May 2026 certain of the Group's officers and employees were allocated 47,500 AGAs (AGA plan 2026-1),

294,476AGAs (AGA plan 2026-2), 1,619 AGAs (AGA plan 2026-3), 41,717 AGAs (AGA plan 2026-4), the vesting of which are

subject to the following service condition: 50% of the AGAs vest at the end of a two-year period from the allocation date, 25% at the

end of a three-year period from the allocation date and 25% at the end of a four-year period from the allocation date.

Accelerated vesting of AGA plans in March 2026

In light of Dr. Didier Scherrer's departure from his role as Chief Scientific Officer, the Group entered into a settlement agreement

("protocole d’accord transactionnel") with Dr. Didier Scherrer in March 2026 under which (i) the Group waived the continued

employment condition attached to 77,050 free shares previously granted to Dr. Scherrer, (ii) the Group waived the continued

employment condition for a further 40,200 free shares, subject to specific performance conditions, and (iii) the remaining 217,750 free

shares previously granted to Dr. Scherrer are lapsed. As a result of transactions (i) and (ii), the Group recognized an expense equal to

the fair value of these 117,250 AGAs (measured on March 5, 2026) of €11,619 thousand during the three-month period ended March

31, 2026 (the accelerated vesting following the settlement agreement was accounted for as a new grant under IFRS 2, and presented

within the "Number of issued AGAs" column in the above table, with the original grants being cancelled and the corresponding

expense reversed as of December 31, 2025).

F-25

Breakdown of the compensation expenses accounted for the three- and six-month periods ended June 30, 2025 and

2026:


TYPE (in thousands of euros)	FOR THE THREE MONTHS ENDED JUNE 30, 2025	FOR THE THREE MONTHS ENDED JUNE 30, 2026	FOR THE SIX MONTHS ENDED JUNE 30, 2025	FOR THE SIX MONTHS ENDED JUNE 30, 2026
BCEs	—	—	—	—
BSAs	(71)	(231)	(137)	(380)
AGAs	(6,261)	(16,569)	(10,884)	(39,030)
Social taxes related to AGAs	(667)	(15,789)	(1,350)	(14,580)
Total	(6,998)	(32,589)	(12,371)	(53,990)

The increase in AGA expenses for the six months ended June 30, 2026 is attributable to the €11,619 thousand expense recognized in

relation to the accelerated vesting of certain of the Group's former Chief Scientific Officer's AGA plans (see above) as well as the

impact of plans granted in 2025.

The significant amount of social taxes related to AGAs (and related provisions) for the three- and six-month periods ended June 30,

2026 compared to the corresponding periods in 2025 is predominantly attributable to the increase in the price of the underlying shares

over the three and six-month periods ended June 30, 2026.

The decrease in social taxes related to AGAs (and related provisions) between March 31, 2026 and June 30, 2026 is attributable to

unused reversals of provisions amounting to €1,736 thousand that occurred during the first quarter of 2026, due to (i) the decrease in

the price of the underlying shares over that period and, to a lesser extent, (ii) forfeitures following employee departures and changes in

estimates regarding the achievement of performance conditions. The amount of unused reversals was partly offset by social charges

recognized in relation to the 77,050 AGAs granted to the Group's former Chief Scientific Officer, for which vesting was effective as of

March 5, 2026 and amounting to €2,256 thousand.

Changes in provisions for social taxes related to AGAs are presented in Note 17.3.

Note 15. Financial liabilities

Financial liabilities break down as follows:


(amounts in thousands of euros)
FINANCIAL LIABILITIES	AS OF DECEMBER 31, 2025	AS OF JUNE 30, 2026
Lease liabilities	554	137
Borrowings	554	137
Royalty certificates	30,237	—
Other financial liabilities	30,237	—
Total non-current financial liabilities	30,790	137
Lease liabilities	1,302	1,075
Borrowings	1,302	1,075
Total current financial liabilities	1,302	1,075
Total financial liabilities	32,093	1,212

F-26

Note 15.1. Structured debt financing with Kreos & Claret subscribed in August 2023 – “Kreos / Claret Financing”

The Kreos / Claret Financing consists of three tranches of €25,000 thousand each in aggregate principal amount (the convertible

OCABSA and the second and third tranches of non-convertible bonds, respectively the "tranches A, B and C") as well as a Minimal

Return Indemnification ("MRI") to the benefit of the bondholders.

In addition to the Kreos / Claret OCABSA, the Group has issued share warrants (the “tranche A-B BSA” and “tranche C BSA”),

giving Kreos and Claret the right to subscribe to up to 214,198 and 405,832 ordinary shares respectively.

The OCABSA are compound instruments, split between (i) a debt component (then measured at amortized cost) and (ii) an equity

component corresponding to the conversion option and the attached OCABSA warrants.

The OCABSA warrants are considered as an embedded component of the bonds rather than a separate stand-alone financial

instrument.

The Kreos / Claret second and third tranches are hybrid instruments, split between (i) debt host contracts accounted for at amortized

cost and (ii) bifurcated embedded derivatives accounted for at fair value through profit and loss, corresponding to the Minimal Return

Indemnifications and the prepayment options (the fair value of the prepayment options being deemed insignificant at issuance and at

the subsequent reporting dates).

As the A-B and C warrants (the "Kreos / Claret BSA") are contractually transferable separately from the bonds and are redeemable in

a variable number of ordinary shares of the Group, they are classified as standalone derivative financial liabilities.

The detailed terms and conditions and the accounting treatment of these instruments are presented in Note 15.1 to the annual

consolidated financial statements of the Group as of December 31, 2025 accompanying the Group’s Annual Report.

Settlement of the liabilities

On August 8, 2025, Kreos Capital VII (UK) Limited converted the Tranche A portion of the Kreos / Claret Financing (the Kreos /

Claret OCABSA), resulting in the issuance of 785,389 ordinary shares and an increase in equity by €16,058 thousand.

On July 30, 2025, Kreos Capital VII Aggregator SCSp opted for the cashless exercise of its share warrants (the tranche A-B BSA and

tranche C BSA), implemented through the repurchase by the Group of 94,117 tranche A-B and C BSA and the issuance of 319,251

ordinary shares of the Group and an increase in equity by €19,570 thousand.

On August 28, 2025, Claret European Growth Capital Fund III SCSp, exercised its share warrants (the tranche A-B BSA and tranche

C BSA) for 206,662 ordinary shares of the Group and an increase in equity by €14,198 thousand.

In August 2025, as a result of (i) the repayments of principal and interests made until that date under the Kreos / Claret Financing, (ii)

the exercise of the Tranche A-B and C BSA and (iii) the conversion of the Kreos OCABSA, the cash generated thereby met the

Minimum Cash Return due to the Kreos / Claret bondholders. Consequently, as no further payment could be due by the Group in

relation to the Kreos / Claret Minimal Return Indemnification, the MRI derivatives were derecognized, resulting in a financial income

of €3,620 thousand.

On November 25, 2025, Claret European Growth Capital Fund III SCSp converted its portion of the Tranche A portion of the Kreos /

Claret Financing (the Claret OCABSA), resulting in the issuance of 392,695 ordinary shares of the Group and an increase in equity by

€8,296 thousand.

On November 28, 2025, the Group notified the bondholders of its intention to prepay in full the outstanding balances of Tranches B

and C of the Kreos / Claret Financing. The transaction was completed on December 23, 2025. The total amount paid by the Group at

that date amounted to €33,823 thousand, consisting of:

F-27

•the outstanding principal of €29,903 thousand, from which the deposit amount of €1,081 thousand initially paid by the Group

to Kreos and Claret was deducted,

•future interests discounted at a discount rate of 4% as per the terms of the prepayment option, amounting to €2,001 thousand,

and

•end-of-loan exit fees of €3,000 thousand.

Following the aforementioned transactions, the Group no longer holds any debt related to the Kreos Claret Financing.

Note 15.2. Heights convertible notes

The Heights convertible notes consists of (i) a host debt instrument and (ii) conversion and settlement options representing embedded

derivatives. The whole instrument is measured at FVTPL at each reporting date.

At inception, the Heights convertible notes' fair value differed from the issuance proceeds by €2,359 thousand.

Since the fair value measurement of the instrument is evidenced by a valuation technique that does not only use data from observable

markets, the carrying amount was adjusted to defer the difference between the fair value measurement and the transaction price, and

the day one gain is therefore recognized in financial income on a straight-line basis over the term of the instrument.

On July 23 and July 30, 2025, the noteholders requested the conversion of respectively 150 and 200 convertible notes (corresponding

to the entirety of the outstanding principal amount of approximately €21.9 million) into 920,377 new ordinary shares of the Group at a

conversion price of €23.7674 per ordinary share (see Note 3.1 "Conversion of the Heights convertible notes – July-August 2025").

At these dates, the fair value of the converted notes of €53,921 thousand was reclassified from financial liabilities to equity. On the

conversion dates, due to the put option being exercised by the holders, the fair values of the Heights notes were deemed equal to the

market prices of the issued shares.

As a result of the derecognition of the Heights notes, the outstanding day-one gain was entirely amortized, resulting in a financial

income of €1,262 thousand recognized in July 2025.

Note 15.3. State guaranteed loan – “PGE”

During the fourth quarter of 2025, the Group prepaid in full the outstanding principal amount of the state-guaranteed loan (Prêt garanti

par l'Etat, or "PGE")) of €1,264 thousand.

F-28

Note 15.4. Lease liabilities

The variations in lease liabilities are set forth below:


(amounts in thousands of euros)	LEASE LIABILITY
AS OF DECEMBER 31, 2024	2,363
(+) Increase	—
(-) Decrease	(486)
AS OF JUNE 30, 2025	1,876

AS OF DECEMBER 31, 2025	1,856
(+) Increase	—
(-) Decrease	(644)
AS OF JUNE 30, 2026	1,212

Lease liabilities mainly relate to the Group’s headquarters in Paris entered into in May 2024, the Boston office entered into in

November 2023 and the Montpellier offices entered into in April 2024 (see Note 8).

As of December 31, 2025 and June 30, 2026, the lease liabilities of the Paris headquarters and Boston offices represented 70% and

70% of the total lease liability, respectively.

Lease expenses related to contracts for which a lease liability and right of use asset is recognized under IFRS 16 were €428 thousand

and €601 thousand for the six-month periods ended June 30, 2025 and 2026, respectively. They were recognized for (i) €362 thousand

and €559 thousand as Depreciation expenses and (ii) €36 thousand and €24 thousand as Interest expenses, for the six-month periods

ended June 30, 2025 and 2026, respectively.

Lease expenses related to short-term lease contracts and low value assets that are not included in the valuation of the lease liability

amount to €175 thousand, and €1 thousand for the six-month periods ended June 30, 2025 and 2026, respectively.

Note 15.5. Royalty certificates

The royalty certificates were measured at amortized cost using the EIR method.

Fair value

The fair value of the royalty certificates is based on the net present value of royalties, which depends on assumptions made by the

Group with regards to the probability of success of its studies (“POS”), the commercialization budget of obefazimod (“peak

penetration”) and the discount rate. As of December 31, 2025, the fair value amounts to €102,001 thousand.

Management ensured that the discount rate of 7.5% used is reasonable based on the specific risk profile of the royalties certificates.

As of December 31, 2025, using the same assumptions with an increase of +5 points of POS, +5% of peak penetration (best case

scenario) and +1% WACC would result in a change in the royalty certificates fair value by respectively €+5810 thousand, €

+2830 thousand and €(4,940) thousand. Using the same assumptions with a decrease of (5) points of POS, (5)% of peak penetration

(worst case scenario) and (1)% WACC would result in a change in the royalty certificates fair value by respectively €(5,810) thousand,

€(5,590) thousand and €+5,251 thousand.

Repurchase

F-29

The royalty certificates were repurchased by the Group on May 7, 2026 for an aggregate price of €76,467 thousand, paid in cash and

ADSs, and subsequently cancelled (see Note 3.3). The impact in profit or loss of the repurchase of the royalty certificates on May 7,

2026 resulted in an expense of €43,205 thousand, which was recognized in the second quarter of 2026. The amount corresponds to the

difference between the certificates' carrying amount on the repurchase date of €33,483 thousand and the total consideration

transferred, comprising an equity consideration of €38,455 thousand and a cash consideration of €38,233 thousand, based on the

exchange rates prevailing at the capital increase date and the settlement date (including the €221 thousand effect of a net foreign

exchange loss on the cash settlement). Consequently, the €5,848 thousand deferred tax liability recognized in the Group's statements

of financial position as of December 31, 2025 was derecognized, and a corresponding tax income was recognized, for the six-month

period ended June 30, 2026 (see Note 22). Transaction costs amounting to €1,002 thousand were accounted for as a deduction from

shareholders' equity.

Note 15.6. Change in financial liabilities

Changes in financial liabilities, excluding derivative instruments, are presented below as of June 30, 2025 and 2026:


(Amounts in thousands of euros)
FINANCIAL LIABILITIES (excluding derivatives instruments)	Kreos/Claret convertible notes (OCABSA)	Kreos & Claret bond loans	Heights convertible notes	PGE	Lease liabilities	Royalty certificates	Total
AS OF DECEMBER 31, 2024	23,370	46,401	21,574	2,488	2,363	13,023	109,218
Repayments	—	(9,140)	(2,188)	(1,250)	(454)	—	(13,032)
Interest paid	(1,125)	(1,974)	(689)	(43)	(36)	—	(3,868)
Non-cash changes: (gain)/loss on recognition or derecognition	—	—	(295)	—	—	—	(295)
Non-cash changes: interest expense and other	2,048	4,136	680	44	36	1,112	8,056
Non-cash changes: other fair value remeasurement	—	—	(1,339)	—	—	—	(1,339)
Non cash changes : Effect of the change in foreign currency exchange rates	—	—	—	—	(32)	—	(32)
AS OF JUNE 30, 2025	24,293	39,423	17,743	1,238	1,876	14,135	98,709
AS OF DECEMBER 31, 2025	—	—	—	—	1,856	30,237	32,093
Repayments	—	—	—	—	(648)	—	(648)
Interest paid	—	—	—	—	(24)	—	(24)
Repurchase settled in cash	—	—	—	—	—	(38,233)	(38,233)
Non cash changes: repurchase settled in shares	—	—	—	—	—	(38,455)	(38,455)
Non-cash changes: (gain)/loss on recognition or derecognition	—	—	—	—	—	43,205	43,205
Non-cash changes: interest expense and other	—	—	—	—	24	3,246	3,270
Non cash changes : Effect of the change in foreign currency exchange rates	—	—	—	—	4	—	4
AS OF JUNE 30, 2026	—	—	—	—	1,212	—	1,212

Note 15.7. Change in derivative instruments

Changes in derivative instruments are presented below:

F-30


(amounts in thousands of euros)	Kreos/Claret BSA	Kreos/Claret Minimal Return Indemnifications	Total
DERIVATIVE FINANCIAL INSTRUMENTS	Kreos/Claret BSA	Kreos/Claret Minimal Return Indemnifications	Total
AS OF DECEMBER 31, 2024	1,166	3,620	4,786
(+) Increase in fair value	391	91	482
(-) Decrease in fair value	—	(72)	(72)
AS OF JUNE 30, 2025	1,557	3,639	5,196

AS OF DECEMBER 31, 2025	—	—	—
AS OF JUNE 30, 2026	—	—	—

Details related to these instruments' accounting treatments and terms and conditions are set forth in Notes 15.1 and 15.2 of these

financial statements, as well as in Notes 15.1 and 15.2 to the annual consolidated financial statements of the Group as of December 31,

2025 accompanying the Group’s Annual Report.

Note 15.8. Breakdown of financial liabilities by maturity

The following are the remaining contractual maturities of financial liabilities as of December 31, 2025 and June 30, 2026. The

amounts are gross and undiscounted, and include contractual interest payments.


(amounts in thousands of euros)	AS OF DECEMBER 31, 2025
CURRENT AND NON-CURRENT FINANCIAL LIABILITIES	GROSS AMOUNT	CONTRACTUAL CASH FLOWS	LESS THAN 1 YEAR	FROM 1 TO 2 YEARS	FROM 2 TO 5 YEARS	LONGER THAN 5 YEARS
Royalty certificates (1)	30,237	—	—	—	—	—
Lease liabilities	1,856	1,906	1,340	450	116	—
Total financial liabilities	32,093	1,906	1,340	450	116	—


(amounts in thousands of euros)	AS OF JUNE 30, 2026
CURRENT AND NON-CURRENT FINANCIAL LIABILITIES	GROSS AMOUNT	CONTRACTUAL CASH FLOWS	LESS THAN 1 YEAR	FROM 1 TO 2 YEARS	FROM 2 TO 5 YEARS	LONGER THAN 5 YEARS
Lease liabilities	1,212	1,238	1,096	51	91	—
Total financial liabilities	1,212	1,238	1,096	51	91	—

(1) The contractual cash flows as of December 31, 2025 above did not include potential future royalty payments related to the royalty

certificates, amounting to 2% of the future net sales of obefazimod (worldwide and for all indications). The amount of royalties that

may be paid under the royalty certificates were capped at €172.1 million in the aggregate. The royalty certificates were repurchased by

the Group on May 7, 2026 and subsequently cancelled (see Note 3.3 and 15. 5).

Note 16. Retirement benefit obligations

Retirement benefit obligations include the liability for the defined benefit plan, measured based on the provisions stipulated

under the applicable collective agreements, i.e. the French pharmaceutical industry’s collective agreement. This commitment

only applies to employees subject to French law. Employees in the U.S. benefit from defined contribution plans (401(k)).

F-31

Note 17. Payables, other current liabilities and provisions

Note 17.1. Trade payables and other current liabilities

Trade payables and other current liabilities break down as follows:


(amounts in thousands of euros)
TRADE PAYABLES AND OTHER CURRENT LIABILITIES	AS OF DECEMBER 31, 2025		AS OF JUNE 30, 2026
Trade payables	23,388		18,263
Accrued invoices	14,159		20,747
Other	4		—
Trade payables and other current liabilities	37,552	—	39,010

Note 17.2. Tax and employee-related payables

Tax and employee-related payables are presented below:


(amounts in thousands of euros)
TAX AND EMPLOYEE-RELATED PAYABLES	AS OF DECEMBER 31, 2025	AS OF JUNE 30, 2026
Employee-related payables	4,816	2,838
Social security and other	2,304	4,674
Other tax and related payments	17	177
TAX AND EMPLOYEE-RELATED PAYABLES	7,137	7,689

The decrease in employee-related payables as of June 30, 2026 compared to December 31, 2025 is mainly related to year-end bonus

accruals.

The increase in Social security and other payables as of June 30, 2026 compared to December 31, 2025 is mainly related to social

contributions on vested AGAs that have become due, which are calculated using the vesting-date share price (see Note 14).

Note 17.3 Provisions

Provisions are presented below:


(amounts in thousands of euros)
PROVISIONS	AGA EMPLOYER CONTRIBUTIONS AND TAXES	OTHER PROVISIONS	TOTAL
AS OF DECEMBER 31, 2025	45,185	694	45,879
Increases	14,202	36	14,237
Provisions used	(10,431)	(563)	(10,994)
Unused reversals	(1,736)	(51)	(1,787)
AS OF JUNE 30, 2026	47,220	115	47,336
Non-current	23,402	20	23,422
Current	23,819	96	23,914

F-32

The Group's provisions as of June 30, 2026 primarily consist of AGA employer contributions and taxes. Movements during the period

were as follows:

•The increase in provisions mainly results from the accrual of obligations arising from share-based compensation

arrangements;

•The provisions used correspond to social contributions on vested AGAs that have become due; and

•The unused reversals are related toforfeitures following employee departures and changes in estimates regarding the

achievement of performance conditions. The amount is presented net of the accrual of obligations arising from services

rendered during the period under the relevant AGA plans. Other provisions primarily relate to employment-related claims.

The change in the current and non-current portions of the provisions for AGA employer contributions and taxes is explained by the

timing of the AGA grants and vesting dates, on which the taxes become due. The increase in the current portion of these provisions as

of June 30, 2026 compared to December 31, 2025 is primarily explained by the vesting of the first tranche of the AGA plan 2025-1

(for which 4,319,500 shares were granted in the aggregate) in the first quarter of 2027.

Note 18. Operating income

Operating income is composed as below:


(amounts in thousands of euros)
OPERATING INCOME	FOR THE THREE MONTHS ENDED JUNE 30, 2025	FOR THE THREE MONTHS ENDED JUNE 30, 2026	FOR THE SIX MONTHS ENDED JUNE 30, 2025	FOR THE SIX MONTHS ENDED JUNE 30, 2026
Research tax credit ("CIR")	1,047	976	2,017	2,115
Depositary service fees	46	225	70	430
Total operating income	1,093	1,201	2,087	2,545

Research tax credit (“CIR”)

The Group carries out research and development projects. As such, it has benefited from a research tax credit for the six-month

periods ended June 30, 2025 and 2026 for an amount of €2,017 thousand and €2,115 thousand, respectively.

Depositary services fees

This line item includes issuance, cancellation and depositary service fees collected from ADS holders by Citibank, who is acting as the

Group's exclusive depositary for its publicly listed ADSs. As part of the depositary agreement between Citibank and the Group, the

latter is entitled to receive a portion of the aforementioned fees collected by Citibank.

Note 19. Operating expenses

F-33

Note 19.1. Sales and marketing


(amounts in thousands of euros)
SALES AND MARKETING	FOR THE THREE MONTHS ENDED JUNE 30, 2025	FOR THE THREE MONTHS ENDED JUNE 30, 2026	FOR THE SIX MONTHS ENDED JUNE 30, 2025	FOR THE SIX MONTHS ENDED JUNE 30, 2026
Personnel costs	487	1,968	961	2,975
Consulting and professional fees	166	814	384	1,480
Other sales and marketing expenses	21	102	189	178
Sales & Marketing	674	2,885	1,534	4,633

The increase in sales and marketing personnel costs for the six-month period ended June 30, 2026 compared to June 30, 2025 was

predominantly driven by the increase in the Group's costs (including personnel costs) related to the preparation for potential future

sales and commercialization efforts of obefazimod in the U.S.

Similar factors have driven the increases for the three-month period ended June 30, 2026 compared to June 30, 2025.

Note 19.2. Research and development

Research and development expenses break down as follows:


(amounts in thousands of euros)
RESEARCH AND DEVELOPMENT EXPENSES	FOR THE THREE MONTHS ENDED JUNE 30, 2025	FOR THE THREE MONTHS ENDED JUNE 30, 2026	FOR THE SIX MONTHS ENDED JUNE 30, 2025	FOR THE SIX MONTHS ENDED JUNE 30, 2026
Sub-contracting, studies and research	30,139	31,481	59,292	51,276
Personnel costs	5,940	19,679	11,309	44,074
Consulting and professional fees	1,867	5,578	5,848	9,604
Intellectual property fees	238	443	476	874
Other research and development expenses	461	1,154	1,021	2,049
Research and development expenses	38,645	58,335	77,946	107,878

The increase in research and development expenses for the six-month period ended June 30, 2026 compared to June 30, 2025 was

primarily due to increasing personnel costs, mainly due to expense recognized in relation to the accelerated vesting of certain of the

Group's former Chief Scientific Officer's AGAs in March 2026 (see Note 14) as well as the impact of share-based compensation

awards granted in 2025 and the related tax and social contributions. This increase was partly offset by a decrease in sub-contracting,

studies and research expenses related to the Group's UC program, attributable to decreased activity in the ABTECT clinical program

as a result of reaching major milestones in the Phase 3 clinical trials in 2025.

The increase in research and development expenses for the three-month period ended June 30, 2026 compared to June 30, 2025 was

primarily due to increasing personnel costs, as a result of the same factors described above.

F-34

Note 19.3. General and administrative


(amounts in thousands of euros)
GENERAL AND ADMINISTRATIVE EXPENSES	FOR THE THREE MONTHS ENDED JUNE 30, 2025	FOR THE THREE MONTHS ENDED JUNE 30, 2026	FOR THE SIX MONTHS ENDED JUNE 30, 2025	FOR THE SIX MONTHS ENDED JUNE 30, 2026
Personnel costs	5,488	17,461	10,547	19,101
Consulting and professional fees	1,768	4,829	3,703	8,173
Other general and administrative expenses	1,014	1,802	2,053	3,101
General and administrative expenses	8,270	24,092	16,303	30,376

The increase in general and administrative expenses for the six-month period ended June 30, 2026 compared to June 30, 2025 was

primarily due to an increase in personnel costs, mainly explained by to the impact of share-based compensation plans granted in 2025

and the related tax and social contributions (see Note 14), as well as an increase in consulting and professional fees, driven by

increased costs associated with building the Group's infrastructure to support future growth in its operations and other general and

administrative expenses.

Similar factors have driven the increase for the three-month periods ended June 30, 2026 compared to June 30, 2025.

The lesser amount of personnel costs over the three-month period ended March 31, 2026 compared to the three-month period ended

June 30, 2026 was primarily due to a decrease in AGAs employer tax and social contributions of €(3,476) thousand, resulting

primarily from (i) the decrease in the Group's share price during the first quarter of 2026 and, to a lesser extent, (ii) forfeitures

following employee departures and changes in estimates regarding the achievement of vesting conditions (see Notes 14 and 17.3).

Note 20. Employees

The Group’s average workforce during the six-month periods ended June 30, 2025 and 2026 was as follows:


HEADCOUNT	FOR THE SIX MONTHS ENDED JUNE 30, 2025	FOR THE SIX MONTHS ENDED JUNE 30, 2026
France	42	49
United States	27	49
Total	69	98

Note 21. Financial gain (loss)

The financial loss breaks down as follows:

F-35


(amounts in thousands of euros)
FINANCIAL GAIN (LOSS)	FOR THE THREE MONTHS ENDED JUNE 30, 2025	FOR THE THREE MONTHS ENDED JUNE 30, 2026	FOR THE SIX MONTHS ENDED JUNE 30, 2025	FOR THE SIX MONTHS ENDED JUNE 30, 2026
Interest on bond loans	(1,981)	—	(4,136)	—
Interest on convertible loan notes	(1,372)	—	(2,728)	—
Interest on PGE	(22)	—	(44)	—
Interest on royalty certificates	(129)	(719)	(1,112)	(3,246)
Interest on lease liabilities	(17)	(11)	(36)	(24)
(Increase) / decrease in derivatives fair value	(536)	—	(482)	—
Loss on derecognition of financial liabilities	—	(43,205)	—	(43,205)
Foreign exchange losses	(1,352)	(188)	(2,306)	(2,411)
Other financial expense	(7)	(6)	(14)	(12)
Financial expenses	(5,415)	(44,130)	(10,857)	(48,899)
Interest income	190	1,210	1,049	1,855
(Increase) / decrease in derivatives fair value	156	—	72	—
Increase / (decrease) in other assets / (liabilities) at fair value through profit and loss	2,765	2,145	1,801	5,420
Effect of unwinding the discount related to advances made to CROs	129	69	362	193
Day-one gain on recognition of financial liabilities	147	—	295	—
Foreign exchange gains	110	1,308	189	10,024
Financial income	3,497	4,733	3,769	17,491
Financial gain (loss)	(1,918)	(39,397)	(7,088)	(31,408)

Financial expenses

Interest on bond loans for the three- and six-month periods ended June 30, 2025 consists of interests from the Kreos / Claret B and C

tranches (non-convertible bonds), drawn down in March and June 2024, respectively, and redeemed in December 2025 (see Note

15.1).

Interest on convertible loan notes for the three- and six-month periods ended June 30, 2025 corresponds to interests from the Kreos /

Claret OCABSA (tranche A) and from the Heights notes, which were converted into ordinary shares of the Group during the second

half of 2025 (see Notes 15.1 and 15.2).

Interest on royalty certificates reflects the non-cash effective interest expense arising from the measurement of the instruments at

amortized cost (see Note 15.5.). As of June 30, 2025, the Group revised the development and commercialization plans of obefazimod

and reassessed its estimate of future royalty cash flows accordingly. This change in estimate resulted in a remeasurement of the

certificates’ amortized cost, using the original EIR of 34% calculated at the date of issuance, which led to a decrease by €940 thousand

of the royalty certificates liability. The resulting gain recorded in June 2025 explains the variance between the interest on royalty

certificates recorded for the three- and six-month periods ended June 30, 2025.

The royalty certificates were repurchased by the Group on May 7, 2026, and subsequently cancelled. The loss resulting from their

derecognition is presented in the line item "Loss on derecognition of financial liabilities" (see Note 3.3 and 15.5).

Increases and decreases in the fair value of derivatives for the six-month period ended June 30, 2025 relate to the Kreos / Claret BSA

and MRI and are detailed in Notes 15.1, 15.2 and 15.7.

The increase in other assets at FVTPL for the three- and six- month period ended June 30, 2026 relate to revaluation of cash

equivalents that are measured at fair value through profit or loss (mutual funds and structured notes) (see Note 11).

Foreign exchange losses for the three- and six-month period ended June 30, 2025 primarily relate to the translation of cash and cash

equivalents held in U.S. dollars into the Company's functional currency as of June 30, 2025, and to other realized and unrealized losses

F-36

on foreign exchange transactions. Foreign exchange losses for the six-month period ended June 30, 2026 relate to an intercompany

payable with the Subsidiary denominated in U.S. dollars, which settlement during the first quarter of 2026 resulted in a net loss of

€1,835 thousand, and to other realized and unrealized losses on foreign exchange transactions (see Note 11).

Financial income

Interest income mainly relates to proceeds invested in cash equivalents and other investments measured at amortized cost, while

increases in assets measured at FVTPL mainly relate to proceeds invested in cash equivalents measured at FVTPL. These proceeds

primarily originate from (i) the Group's initial public offering on the Nasdaq Global Market and the concurrent European Private

Placement from October 2023, (ii) the Kreos / Claret and Heights Financings and (iii) the Group's 2025 Offering (see Note 11).

The decrease in other liabilities at FVTPL mainly relate to the Heights Convertible Notes for the three- and six-month periods ended

June 30, 2025 (see Note 15.2).

Foreign exchange gains for the three- and six-months period ended June 30, 2026 relate to (i) the revaluation of the intercompany

current account with the Subsidiary denominated in U.S. dollars, resulting in a net gain of €6,733 thousand, (ii) the translation of cash

and cash equivalents held in U.S. dollars into the Company's functional currency as of June 30, 2026, resulting in a net gain of

€2,736 thousand (see Note 11), and (iii) other realized and unrealized gains on foreign exchange transactions.

Note 22. Income tax

The Group incurred tax losses in the current period and prior years. As the recoverability of these tax losses is not considered probable

in subsequent periods due to the uncertainties inherent in the Group’s business, the Group has not recognized deferred tax assets

beyond deferred tax liabilities arising within the same taxable entity under the same taxable regime and with consistent timing of

reversal, after considering, if applicable, limitations in the use of deductible tax losses carried forward from prior periods applicable

under tax laws in France and in the U.S.

As of June 30, 2026, following the repurchase of the royalty certificates on May 7, 2026, the Group reassessed the expected reversal

of temporary taxable and deductible differences existing at the reporting date and concluded that the recognition of a deferred tax

liability in the Group's Statements of Financial Position was no longer required. Accordingly, the deferred tax liability of

€5,848 thousand recorded as of December 31, 2025 has been reversed, resulting in the recognition of a corresponding tax income for

the six-month period ended June 30, 2026.

Note 23. Loss per share

Basic loss per share is calculated by dividing income (loss) attributable to equity holders of the Company by the weighted-

average number of outstanding ordinary shares for the period.

Diluted loss per share is calculated by adjusting the weighted average number of ordinary shares outstanding to assume

conversion of all dilutive potential ordinary shares.


(amounts in thousands of euros, except share data)
BASIC AND DILUTED LOSS PER SHARE	FOR THE THREE MONTHS ENDED JUNE 30, 2025	FOR THE THREE MONTHS ENDED JUNE 30, 2026	FOR THE SIX MONTHS ENDED JUNE 30, 2025	FOR THE SIX MONTHS ENDED JUNE 30, 2026
Weighted average number of outstanding shares	63,440,023	79,647,974	63,409,688	79,274,779
Net loss for the period	(48,414)	(117,433)	(100,784)	(165,900)
Basic and diluted loss per share (€/share)	(0.76)	(1.47)	(1.59)	(2.09)

F-37

Since net results for the three- and six-month periods ended June 30, 2025 and 2026 are losses, potentially dilutive instruments (BCEs,

BSAs, AGAs, the OCABSA, the Kreos / Claret BSAs and the Heights notes) have been excluded from the computation of diluted

weighted-average shares outstanding because such instruments had an antidilutive impact. Consequently, diluted loss per share is the

same as the basic loss per share.

Note 24. Related parties

Except for share-based compensation plans (see Note 14), the Group has not engaged in any new transaction with its related parties

over the six-month period ended June 30, 2026.

Note 25. Off-balance sheet commitments given and contingent liabilities

Over the six-month period ended June 30, 2026, the Group has not entered into any significant additional off-balance sheet

commitment or amended already existing commitments. The off-balance sheet commitments given by the Group as of June 30, 2026

are identical to December 31, 2025, with the exception of the following changes in the commitments related to CRO contracts.

In the ordinary course of business, the Group regularly uses the services of subcontractors and enters into research and partnership

arrangements with various CROs, and with public- sector partners or subcontractors, who conduct clinical trials and studies in relation

to the drug candidates. As of December 31, 2025 and June 30, 2026, the Group’s commitments amounted to €205,131 thousand and

€186,350 thousand, respectively. The cost of services performed by CROs is recognized as an operating expense as incurred.

Note 26. Off-balance sheet commitments received and contingent assets

Over the six-month period ended June 30, 2026, the Group has not received any significant additional commitment and has not

identified any contingent assets susceptible to being recognized in the future.

Note 27. Management and assessment of financial risks

The Group is exposed to interest rate risk, credit risk, foreign currency risk and liquidity risk. The Group has not identified any

significant changes in the identified credit and interest rate risks as of June 30, 2026 compared to December 31, 2025.

Liquidity risk

The remaining contractual maturities of financial liabilities as of December 31, 2025 and June 30, 2026 are presented in Note 15.8.

The Group's estimate of its cash runway as of the date of approval of these financial statements is set forth in Note 2 - Going concern.

Foreign currency risk

The Group is exposed to a risk of exchange rates fluctuations on commercial transactions performed in currencies different from the

functional currency of the Group entity recording the transactions.

As of June 30, 2026, the monetary (i) assets and (ii) liabilities denominated in U.S. dollars held by the Company amounted to

respectively (i) $277,156 thousand (primarily composed of cash and cash equivalents of $133,965 thousand, intercompany receivables

of $126,795 thousand) and (ii) $2,018 thousand.


Exhibit Index

Exhibit 99.1	Press release, dated September 21, 2026
Exhibit 99.2	Unaudited Interim Condensed Consolidated Financial Statements


		Abivax SA (Registrant)

Date: September 21, 2026		/s/ Marc de Garidel
		Chief Executive Officer


	Page
INTRODUCTION.................................................................................................................	1
RISK FACTORS...................................................................................................................	3
OPERATING RESULTS........................................................................................................	4


Condensed Consolidated Statements of Financial Position...............................................................	F-2
Condensed Consolidated Statements of Loss....................................................................................	F-3
Condensed Consolidated Statements of Comprehensive Loss..........................................................	F-4
Condensed Consolidated Statements of Changes in Shareholders’ Equity.......................................	F-5
Condensed Consolidated Statements of Cash Flows.........................................................................	F-6
Notes to the Condensed Consolidated Financial Statements.............................................................	F-7


INDEX TO THE UNAUDITED INTERIM CONDENSED CONSOLIDATED FINANCIAL STATEMENTS............................................................................................................................................	F-1


(amounts in thousands of euros)	LICENSES	SOFTWARE	PATENTS	TOTAL
GROSS VALUES
AS OF DECEMBER 31, 2024	120	27	6,529	6,677
AS OF JUNE 30, 2025	120	27	6,529	6,677

AS OF DECEMBER 31, 2025	120	27	6,529	6,677
AS OF JUNE 30, 2026	120	27	6,529	6,677