15 institutions reported holding $83,456 of ISPECIMEN INC (ISPC) in SEC 13F filings for 2026-03-31. Largest institutional holders: GEODE CAPITAL MANAGEMENT, LLC ($49,155), JANE STREET GROUP, LLC ($8,734), UBS Group AG ($8,438), CITADEL ADVISORS LLC ($7,924), VANGUARD FIDUCIARY TRUST CO ($4,423). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | GEODE CAPITAL MANAGEMENT, LLC | $49,155 | 313,098 | Added |
| 2 | JANE STREET GROUP, LLC | $8,734 | 55,631 | Added |
| 3 | UBS Group AG | $8,438 | 53,744 | Added |
| 4 | CITADEL ADVISORS LLC | $7,924 | 50,471 | New |
| 5 | VANGUARD FIDUCIARY TRUST CO | $4,423 | 28,170 | New |
| 6 | StoneX Group Inc. | $3,094 | 19,710 | New |
| 7 | Tower Research Capital LLC (TRC) | $1,044 | 6,651 | Trimmed |
| 8 | BlackRock, Inc. | $444 | 2,827 | Hold |
| 9 | VANGUARD CAPITAL MANAGEMENT LLC | $194 | 1,237 | New |
| 10 | SBI Securities Co., Ltd. | $3 | 19 | Added |
| 11 | GILL CAPITAL PARTNERS, LLC | $2 | 15 | New |
| 12 | Sachetta, LLC | $1 | 2 | Hold |
| 13 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $0 | 0 | Exited |
| 14 | Jump Financial, LLC | $0 | 0 | Exited |
| 15 | BANK OF AMERICA CORP /DE/ | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31