8-K

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):August 18, 2025

SAGIMET BIOSCIENCES INC.

(Exact name of registrant as specified in itscharter)

Sagimet Biosciences Inc.

155 Bovet Road, Suite 303,

San Mateo, California 94402

(Address of principal executive offices, includingzip code)

(650) 561-8600

(Registrant’s telephone number, includingarea code)

Not Applicable

(Former Name or Former Address, if Changed SinceLast 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:

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

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 x

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. ¨

On August 18, 2025, the Audit Committee of the Board of Directors (the “Board”) of Sagimet Biosciences Inc. (the “Company”) recommended and the Board approved (i) the appointment of KPMG LLP (“KPMG”) as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2025 and related interim periods and, concurrently, (ii) the dismissal of Deloitte & Touche LLP (“Deloitte”) as the Company’s independent registered public accounting firm, effective immediately.

The audit reports of Deloitte on the Company’s financial statements as of December 31, 2024 and December 31, 2023, did not contain an adverse opinion or a disclaimer of opinion, and were not qualified or modified as to uncertainty, audit scope, or accounting principles. Furthermore, during the two most recent fiscal years ended December 31, 2024 and December 31, 2023, and the subsequent interim period through August 18, 2025, there were no disagreements with Deloitte on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure, which disagreements, if not resolved to the satisfaction of Deloitte, would have caused it to make a reference in connection with its opinion to the subject matter of the disagreement or reportable events as defined in Item 304(a)(1)(v) of Regulation S-K.

During the two most recent fiscal years ended December 31, 2024 and December 31, 2023, and the subsequent interim period through August 18, 2025, KPMG has not been engaged as either the principal accountant to audit the Company’s financial statements, or as an independent accountant to audit a significant subsidiary of the Company. During the two most recent fiscal years, ended December 31, 2024 and December 31, 2023, and the subsequent interim period through August 18, 2025, neither the Company nor anyone on the Company’s behalf consulted KPMG regarding (i) the application of accounting principles to a specified transaction, either completed or proposed, or the type of audit opinion that might be rendered on the Company’s financial statements, and no written report or oral advice was provided to the Company by KPMG that KPMG concluded was an important factor considered by the Company in reaching a decision as to the accounting, auditing or financial reporting issue; or (ii) any matter that was either the subject of a disagreement within the meaning of Item 304(a)(1)(iv) of Regulation S-K, or a reportable event within the meaning of Item 304(a)(1)(v) of Regulation S-K.

The Company provided Deloitte with a copy of the foregoing disclosures prior to the filing of this Current Report on Form 8-K and requested that Deloitte furnish a letter addressed to the Securities and Exchange Commission, a copy of which is attached hereto as Exhibit 16.1, stating whether it agrees with such disclosures, and, if not, stating the respects in which it does not agree.

SIGNATURE

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

Exhibit 16.1

August 22, 2025

Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549-7561

Dear Sirs/Madams:

We have read Item 4.01 of Sagimet Biosciences Inc.’s Form 8-K dated August 22, 2025, and have the following comments:

Yours truly,

/s/ DELOITTE & TOUCHE LLP