Assertio Holdings, Inc. (ASRT) Institutional Ownership

Ownership Summary

Assertio Holdings, Inc. (NASDAQ:ASRT) currently has 69 active institutional owners and shareholders as of today (September 2025), that have filed 13F forms with the Securities Exchange Commission (SEC).

• These investors collectively held 363.7% of the company's total shares outstanding in September 2025, down from 386.3% in June 2025.
• The company experienced a 2.22% quarterly change in institutional shares held, alongside a decrease of 18.82% in total owners annually.
• Of these 69 institutional investors, 24 increased their holdings in Assertio Holdings, while 18 of them reduced positions, and 27 investors maintained their exposure.
• This class of investors increased its holdings in Assertio Holdings to 25.23Mn shares for the 13F-cycle ending September 2025, up by 547.03K shares quarter on quarter, and down 3.61Mn shares year over year.
• As of September 30, 2025, Nantahala Capital Management, LLC held Assertio Holdings's largest shareholding position with over 8.81Mn shares, representing 127.01% of total outstanding shares.
• Among the most significant buyers of Assertio Holdings during September 2025 were CITADEL ADVISORS LLC (325.51K), GSA CAPITAL PARTNERS LLP (321.58K), MORGAN STANLEY (159.09K), RENAISSANCE TECHNOLOGIES LLC (120.14K), Mariner, LLC (80.50K).
• Leading sellers of Assertio Holdings stock in September 2025 included Invesco Ltd. (137.12K), UBS Group AG (101.56K), MILLENNIUM MANAGEMENT LLC (88.54K), AQR CAPITAL MANAGEMENT LLC (81.01K), TWO SIGMA INVESTMENTS, LP (63.94K).
• The top 10 institutional holders of Assertio Holdings for the quarter ending September 2025 included Nantahala Capital Management, LLC (8.81Mn), VANGUARD GROUP INC (4.43Mn), RENAISSANCE TECHNOLOGIES LLC (2.94Mn), BlackRock, Inc. (1.36Mn), GEODE CAPITAL MANAGEMENT, LLC (1.02Mn), CM Management, LLC (724.38K), MILLENNIUM MANAGEMENT LLC (605.98K), MORGAN STANLEY (597.59K), TWO SIGMA ADVISERS, LP (427.53K), GSA CAPITAL PARTNERS LLP (381.58K).