X0609 4 2026-05-05 0 0001808665 Assertio Holdings, Inc. ASRT 0001237262 MCKEE WILLIAM false ASSERTIO HOLDINGS, INC. 100 SOUTH SAUNDERS ROAD, SUITE 300 LAKE FOREST IL 60045 1 0 0 0 0 Common Stock 2026-05-05 4 A 0 4851 0 A 27936 D Restricted stock units that (1) vest in full on the earlier of the first anniversary of the grant date and the next annual meeting of stockholders which is at least 50 weeks after the immediately preceding year's annual meeting, and (2) were granted on the date of the Issuer's 2026 Annual Meeting of Stockholders in accordance with the Issuer's Nonemployee Director Compensation & Grant Policy. On December 26, 2025, the Issuer effected a 1-for-15 reverse stock split (the "Reverse Stock Split"). The number of securities reported on this Form 4 have been adjusted to reflect the Reverse Stock Split. /s/ Sam Schlessinger, Attorney-in-fact for William T. McKee 2026-05-06