UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 OF

THE SECURITIES EXCHANGE ACT OF 1934

FOR THE MONTH OF OCTOBER 2026

Commission File Number: 001-43391

SK hynix Inc.

(Translation of registrant’s name into English)

2091, Gyeongchung-daero

Bubal-eup, Icheon-si

Gyeonggi-do 17336, Korea

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒     Form 40-F ☐

Preliminary Results of Operations

The preliminary results of SK hynix Inc. (“SK hynix” or the “Company”) shown below may differ from the final results.

1. Basis: Consolidated

Classification (unit : in millions of Won or %)

Current Period (Third quarter(1) of 2026)

Previous Period (Second quarter(2) of 2026)

Changes (%)

Year-to-Year Comparison (Third quarter(1) of 2025)

Changes (%)

Revenue

Quarterly Results Year-to-date (“YTD”)(3) Results

104,615,483 236,510,516

79,318,746 N.A.

*

31.9 N.A.

*

24,448,929 64,320,022

327.9 267.7

Operating Profit

Quarterly Results YTD(3) Results

83,333,818 181,486,709

60,542,608 N.A

*

37.6 N.A

*

11,383,390 28,036,745

632.1 547.3

Profit from Continuing Operations Before Income Tax

Quarterly Results YTD(3) Results

50,708,500 225,033,713

122,708,355 N.A.

*

(58.7 N.A.

) *

14,790,428 32,812,240

242.8 585.8

Profit (Loss) for the Period

Quarterly Results YTD(3) Results

39,775,593 174,044,095

93,922,593 N.A.

*

(57.7 N.A.

) *

12,597,538 27,701,949

215.7 528.3

Attributable To: Controlling Interests

Quarterly Results YTD(3) Results

39,534,392 173,684,804

93,820,236 N.A.

*

(57.9 N.A.

) *

12,595,195 27,699,504

213.9 527.0

(1)	Refers to the three-month period from July 1 to September 30 of a given year.

(2)	Refers to the three-month period from April 1 to June 30 of a given year.

(3)	Refers to the nine-month period from January 1 to September 30 of a given year.

*	Means “not applicable.”

2. Source of Data		Data Provider		Investor Relations, SK hynix
		Provided for		Investors and Press
		(Expected) Date / Time of Provision		October 28, 2026 / 9:00 a.m. (Seoul time)
		Location		2026 3Q Earnings Results Conference Call
		Organizing Team		Investor Relations, SK hynix (+82-31-5185-4114)
3. Other Important Matters Relating to an Investment Decision		-   The preliminary results set forth in this report have been prepared on a consolidated basis in accordance with International Financial Reporting Standards as adopted in Korea. As these results are provisional figures for which the audit by the Company’s external auditor has not yet been completed, they may be subject to change. -   The materials for the Company’s conference call will be available on its Investor Relations website on October 28, 2026 (Seoul time) (https://www.skhynix.com g IR g Financial Information g Earnings Release).

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, thereunto duly authorized.

Date: October 28, 2026