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

February 27, 2026

Date of Report (Date of earliest event reported)

Registrant’s telephone number, including area code: (213) 273-5453

(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:

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 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

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. ¨

Item 5.03. Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

On February 27, 2026, the Board of Directors (the “Board”) of Liminatus Pharma, Inc. (the “Company”) approved an amendment to the Company’s bylaws (the “Bylaws”) to reduce the quorum requirement for meetings of the stockholders from a majority to one-third (1/3) of the voting power of the capital stock of the Company issued and outstanding and entitled to vote (the “Bylaw Amendment”).

The amendment to the Bylaws as discussed above, which was effective upon adoption by the Board, amended Article II, Section 26 of the Bylaws in its entirety to read as follows:

2.6 QUORUM

The holders of one-third (1/3) of the voting power of the capital stock of the Corporation issued and outstanding and entitled to vote at the meeting, present in person or represented by proxy, shall constitute a quorum for the transaction of business at all meetings of the stockholders. Where a separate vote by a class or series or classes or series is required, the holders of one-third (1/3) of the voting power of the outstanding shares of such class or series or classes or series, present in person or represented by proxy, shall constitute a quorum entitled to take action with respect to that vote on that matter, except as otherwise provided by law, the certificate of incorporation or these bylaws.

If, however, such quorum is not present or represented at any meeting of the stockholders, then either (a) the chairperson of the meeting, or (b) the stockholders so present (by the affirmative vote of the holders of a majority in voting power of the capital stock of the Corporation which are present in person or represented by proxy and entitled to vote thereon) shall have power to adjourn the meeting from time to time, without notice other than announcement at the meeting in accordance with Section 2.7, until a quorum is present or represented.

The Board also authorized the Company to submit the Bylaw Amendment for ratification by stockholders at the Company’s next annual meeting of stockholders. If approved by stockholders, the Bylaw Amendment will be formally ratified; if not approved, the Board has the authority to maintain the amendment in accordance with Delaware law.

The foregoing description of the Bylaw Amendment does not purport to be complete and is qualified in its entirety by reference to the full text of the amended Bylaws, which are filed as Exhibit 3.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.

SIGNATURES

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.