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)

May 5, 2026

ASSERTIO HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

100 South Saunders Rd., Suite 300,

Lake Forest, IL 60045

(Address of principal executive offices, including zip code)

(224) 419-7106

(Registrant’s telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

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

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):

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. ¨

Assertio Holdings, Inc. (the “Company”) held its 2026 Annual Meeting of Stockholders on May 5, 2026 at 11:30 a.m. Central Time (the “Annual Meeting”).

(e) At the Annual Meeting, the Company’s stockholders approved an amendment and restatement to the Company’s Amended and Restated 2014 Omnibus Incentive Plan (as so amended, the “2014 Plan”) to increase the number of shares available for issuance thereunder by 400,000 shares.

For additional information regarding the 2014 Plan, please refer to the heading “Description of the 2014 Plan” contained in Proposal 2 of the Company’s Definitive Proxy Statement on Schedule 14A, filed with the Securities and Exchange Commission on April 6, 2026 (the “Proxy Statement”).

The foregoing description and the summary contained in the Proxy Statement do not purport to be complete and are qualified in their entirety by reference to the full text of the 2014 Plan, a copy of which is filed as Exhibit 10.1 hereto and is incorporated herein by reference.

At the Annual Meeting, the Company’s stockholders considered and voted on the following proposals: (i) to elect the six director nominees to hold office until the 2027 Annual Meeting of Stockholders (“Proposal 1”); (ii) to approve an amendment and restatement of the Company’s Amended and Restated 2014 Omnibus Incentive Plan to increase the number of shares available for issuance thereunder (“Proposal 2”); (iii) to approve, on an advisory basis, the compensation of the Company’s named executive officers (“Proposal 3”); and (iv) to ratify the appointment of Grant Thornton LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026 (“Proposal 4”).

A summary of the final voting results for each of the four matters voted upon by the stockholders at the Annual Meeting is set forth below.

Proposal 1: The stockholders of the Company elected each of the six director nominees to serve on the board of directors (the “Board”) for a term to expire at the 2027 Annual Meeting of Stockholders and until their successors are elected and qualified, or until their earlier death, retirement, resignation or removal. The votes on Proposal 1 were as follows:

Proposal 2: The stockholders of the Company approved an amendment and restatement of the Company’s Amended and Restated 2014 Omnibus Incentive Plan to increase the number of shares available for issuance thereunder. The votes on Proposal 2 were as follows:

Proposal 3: The stockholders of the Company approved, on an advisory basis, the compensation of the Company’s named executive officers. The votes on Proposal 3 were as follows:

Proposal 4: The stockholders of the Company ratified the appointment of Grant Thornton LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026. The votes on Proposal 4 were as follows:

(d) Exhibits

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.

Date: May 7, 2026