Cytosorbents Corp (CTSO) Institutional Ownership

Ownership Summary

Cytosorbents Corp (NASDAQ:CTSO) currently has 45 active institutional owners and shareholders as of today (December 2025), that have filed 13F forms with the Securities Exchange Commission (SEC).

• These investors collectively held 26.2% of the company's total shares outstanding in December 2025, up from 26.1% in September 2025.
• Institutional share ownership changed by 3.41% QoQ, while the number of institutional owners saw a decrease of 13.46% YoY.
• The latest 13F cycle for Cytosorbents reveals that of 45 total investors, 21 funds grew their exposure, whereas 10 reduced theirs and 14 made no changes.
• The total number of shares held by institutions in Cytosorbents increased to 16.58Mn as of December 2025, a net change of up by 546.80K shares quarter on quarter, and up 1.25Mn shares year over year.
• The top institutional stake in Cytosorbents as of December 31, 2025 belongs to AVENIR CORP, which owns 5.23Mn shares, or 8.25% of the company.
• Among the most significant buyers of Cytosorbents during December 2025 were Pathstone Holdings, LLC (499.95K), CM Management, LLC (188.37K), AVENIR CORP (147.26K), CITADEL ADVISORS LLC (83.59K), GSA CAPITAL PARTNERS LLP (36.16K).
• Leading sellers of Cytosorbents stock in December 2025 included Skylands Capital, LLC (272.75K), Sargent Investment Group, LLC (126.70K), Kestra Advisory Services, LLC (38.83K), RENAISSANCE TECHNOLOGIES LLC (34.69K), GOLDMAN SACHS GROUP INC (24.60K).
• The top 10 institutional holders of Cytosorbents for the quarter ending December 2025 included AVENIR CORP (5.23Mn), VANGUARD GROUP INC (2.20Mn), Skylands Capital, LLC (1.85Mn), Neuberger Berman Group LLC (1.63Mn), CM Management, LLC (1.48Mn), BlackRock, Inc. (770.55K), Sargent Investment Group, LLC (612.00K), GEODE CAPITAL MANAGEMENT, LLC (603.77K), Pathstone Holdings, LLC (499.95K), CIBC Private Wealth Group LLC (172.65K).