iSpecimen Inc. (ISPC) Institutional Ownership

Ownership Summary

iSpecimen Inc. (NASDAQ:ISPC) currently has 12 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 6.2% of the company's total shares outstanding in September 2025, up from 1.9% in June 2025.
• On a quarter-over-quarter basis, institutional holdings shifted by 649.96%, with a year-over-year an increase of 100.00% in the count of filers.
• During the quarter, 7 institutions bought more iSpecimen shares, 3 sold shares, and 2 of the 12 total investors held their position steady.
• Collectively, institutional investors increased their stake in iSpecimen to 343.09K shares as of September 2025, a change that is up by 297.34K shares quarter on quarter and up 304.17K shares year over year.
• The top institutional stake in iSpecimen as of September 30, 2025 belongs to RENAISSANCE TECHNOLOGIES LLC, which owns 153.46K shares, or 2.77% of the company.
• Among the most significant buyers of iSpecimen during September 2025 were RENAISSANCE TECHNOLOGIES LLC (153.46K), Virtu Financial LLC (63.26K), Scientech Research LLC (29.49K), VANGUARD GROUP INC (29.41K), GEODE CAPITAL MANAGEMENT, LLC (26.88K).
• Leading sellers of iSpecimen stock in September 2025 included Tower Research Capital LLC (TRC) (3.83K), JANE STREET GROUP, LLC (1.64K), SBI Securities Co., Ltd. (3).
• The top 10 institutional holders of iSpecimen for the quarter ending September 2025 included RENAISSANCE TECHNOLOGIES LLC (153.46K), Virtu Financial LLC (63.26K), GEODE CAPITAL MANAGEMENT, LLC (41.69K), Scientech Research LLC (29.49K), VANGUARD GROUP INC (29.41K), JANE STREET GROUP, LLC (20.26K), BlackRock, Inc. (2.83K), Tower Research Capital LLC (TRC) (2.36K), FMR LLC (300), BANK OF AMERICA CORP /DE/ (45).