UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 14, 2026

MOONLAKE IMMUNOTHERAPEUTICS

(Exact Name of Registrant as Specified in Its Charter)

Cayman Islands 001-39630 98-1711963

(State or Other Jurisdiction

of Incorporation)

(Commission File Number) (IRS Employer
Identification No.)

Dorfstrasse 29

6300 Zug

Switzerland

(Address of principal executive offices and Zip Code)

41 415108022

(Registrant’s Telephone Number, Including Area Code)

N/A

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2 below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered
Class A ordinary share, par value $0.0001 per share MLTX The Nasdaq Capital Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 8.01. Other Events.

On July 10, 2026, the underwriters of the previously announced public offering of Class A ordinary shares, par value $0.0001 per share (the “Ordinary Shares”), of MoonLake Immunotherapeutics (the “Company”) and, in lieu of Ordinary Shares to certain investors that so choose, pre-funded warrants to purchase Ordinary Shares, exercised in full their option (the “Option”) to purchase an additional 1,500,000 Ordinary Shares (the “Option Shares”). As a result of the exercise of the Option, the Company received additional gross proceeds of $30.0 million from the sale of the Option Shares, before deducting underwriting discounts and commissions and offering expenses. The closing of the issuance and sale of the Option Shares occurred on July 14, 2026.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

MOONLAKE IMMUNOTHERAPEUTICS
Date: July 14, 2026 By: /s/ Matthias Bodenstedt
Name: Matthias Bodenstedt
Title: Chief Financial Officer

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