10 institutions reported holding $124,577 of APTORUM GROUP LIMITED (APM) in SEC 13F filings for 2026-03-31. Largest institutional holders: CITADEL ADVISORS LLC ($73,557), SUSQUEHANNA INTERNATIONAL GROUP, LLP ($13,353), XTX Topco Ltd ($11,987), MORGAN STANLEY ($10,555), RENAISSANCE TECHNOLOGIES LLC ($9,422). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | CITADEL ADVISORS LLC | $73,557 | 92,420 | Trimmed |
| 2 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $13,353 | 16,777 | New |
| 3 | XTX Topco Ltd | $11,987 | 15,061 | New |
| 4 | MORGAN STANLEY | $10,555 | 13,262 | Trimmed |
| 5 | RENAISSANCE TECHNOLOGIES LLC | $9,422 | 11,838 | New |
| 6 | OSAIC HOLDINGS, INC. | $4,400 | 5,500 | Trimmed |
| 7 | UBS Group AG | $1,297 | 1,629 | Trimmed |
| 8 | SBI Securities Co., Ltd. | $6 | 7 | Hold |
| 9 | TWO SIGMA INVESTMENTS, LP | $0 | 0 | Exited |
| 10 | BNP PARIBAS FINANCIAL MARKETS | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31