Cytosorbents Corp (CTSO) Institutional Ownership

Ownership Summary

Cytosorbents Corp (NASDAQ:CTSO) showed up in the 13F filings of 50 institutional investors as of December 2025.

• These investors collectively held 26.9% of Cytosorbents's outstanding shares in December 2025, up from 26.4% in September 2025.
• They increased total shares held in CTSO by 3.25% quarter over quarter, and investors in Cytosorbents decreased 3.85% from a year ago.
• During the quarter, 22 of these 50 funds increased positions in CTSO, 14 reduced exposure, and 14 held steady.
• Institutional investors collectively held 16.86Mn shares in Cytosorbents as of December 2025, up by 531.19K shares quarter on quarter, and up 1.08Mn shares year over year.
• As of December 31, 2025, AVENIR CORP held the largest stake in Cytosorbents with 5.23Mn shares, accounting for 8.33% of total shares outstanding.
• The biggest buyers of Cytosorbents for the quarter ending December 2025 included Pathstone Holdings, LLC (499.96K), CM Management, LLC (188.37K), AVENIR CORP (147.26K), CITADEL ADVISORS LLC (83.59K), GSA CAPITAL PARTNERS LLP (36.16K).
• The largest sellers of Cytosorbents for the quarter ending December 2025 were Skylands Capital, LLC (272.75K), Sargent Investment Group, LLC (126.7K), Kestra Advisory Services, LLC (38.83K), Bank Of America Corp /De/ (38.7K), RENAISSANCE TECHNOLOGIES LLC (34.68K).
• Business Quant data shows the 10 biggest positions in Cytosorbents as of December 2025 are held by AVENIR CORP (5.23Mn), VANGUARD GROUP INC (2.2Mn), Skylands Capital, LLC (1.85Mn), Neuberger Berman Group LLC (1.63Mn), CM Management, LLC (1.48Mn), BlackRock, Inc. (770.55K), Sargent Investment Group, LLC (612.0K), GEODE CAPITAL MANAGEMENT, LLC (603.77K), Pathstone Holdings, LLC (499.96K), CIBC Private Wealth Group LLC (172.65K).