ASP Isotopes ASPI Institutional Ownership

Ownership Summary

ASP Isotopes Inc. (NASDAQ:ASPI) showed up in the 13F filings of 176 institutional investors as of March 2026.

• These investors collectively held 52.4% of ASP Isotopes's outstanding shares in March 2026, down from 73.3% in December 2025.
• Their total shares held in ASPI increased 26.1% from the prior quarter, while the number of investors in ASP Isotopes increased 77.78% year over year.
• Activity in ASPI broke down as 118 buyers, 42 sellers, and 16 unchanged among 176 total holders.
• Institutional investors collectively held 63.38Mn shares in ASP Isotopes as of March 2026, up by 13.12Mn shares quarter on quarter, and up 30.33Mn shares year over year.
• BlackRock, Inc. is the top holder of ASP Isotopes as of March 31, 2026, with 8.33Mn shares representing 6.88% of outstanding stock.
• The largest buyers of ASP Isotopes for the quarter ending March 2026 were Encompass Capital Advisors LLC (6.91Mn), VANGUARD CAPITAL MANAGEMENT LLC (5.06Mn), BlackRock, Inc. (1.54Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (977.17K), EXCHANGE TRADED CONCEPTS, LLC (783.24K).
• The largest sellers of ASP Isotopes for the quarter ending March 2026 were Goldman Sachs Group Inc (2.9Mn), Alyeska Investment Group, L.P. (2.2Mn), CITADEL ADVISORS LLC (957.55K), JANE STREET GROUP, LLC (902.48K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (459.3K).
• Business Quant data shows the 10 biggest positions in ASP Isotopes as of March 2026 are held by BlackRock, Inc. (8.33Mn), Encompass Capital Advisors LLC (6.91Mn), VANGUARD CAPITAL MANAGEMENT LLC (5.06Mn), Rovida Investment Management Ltd (4.1Mn), UBS Group AG (2.84Mn), GEODE CAPITAL MANAGEMENT, LLC (2.74Mn), Alyeska Investment Group, L.P. (2.69Mn), State Street Corp (2.32Mn), EXCHANGE TRADED CONCEPTS, LLC (2.18Mn), AWM Investment Company, Inc. (2.12Mn).