43 institutions reported holding $22.0M of XILIO THERAPEUTICS INC (XLO) in SEC 13F filings for 2026-03-31. Largest institutional holders: Bain Capital Life Sciences Investors, LLC ($5.6M), GILEAD SCIENCES, INC. ($5.5M), Frazier Life Sciences Management, L.P. ($3.6M), Sio Capital Management, LLC ($1.3M), VANGUARD CAPITAL MANAGEMENT LLC ($1.0M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Bain Capital Life Sciences Investors, LLC | $5.6M | 664,021 | Trimmed |
| 2 | GILEAD SCIENCES, INC. | $5.5M | 650,389 | Trimmed |
| 3 | Frazier Life Sciences Management, L.P. | $3.6M | 422,505 | Trimmed |
| 4 | Sio Capital Management, LLC | $1.3M | 152,464 | Trimmed |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $1.0M | 123,660 | New |
| 6 | Caligan Partners LP | $942,996 | 112,128 | New |
| 7 | Merck & Co., Inc. | $891,309 | 105,982 | Trimmed |
| 8 | Stonepine Capital Management, LLC | $539,602 | 64,162 | Trimmed |
| 9 | MORGAN STANLEY | $483,516 | 57,493 | Trimmed |
| 10 | RENAISSANCE TECHNOLOGIES LLC | $416,850 | 49,566 | Trimmed |
| 11 | AJU IB Investment Co., Ltd. | $401,115 | 47,695 | Trimmed |
| 12 | GEODE CAPITAL MANAGEMENT, LLC | $312,848 | 37,197 | Trimmed |
| 13 | FMR LLC | $307,453 | 36,558 | Trimmed |
| 14 | VANGUARD FIDUCIARY TRUST CO | $239,475 | 28,475 | New |
| 15 | GSA CAPITAL PARTNERS LLP | $143,000 | 16,946 | Trimmed |
| 16 | Velan Capital Investment Management LP | $120,137 | 14,285 | Trimmed |
| 17 | Ghisallo Capital Management LLC | $116,058 | 13,800 | Trimmed |
| 18 | STATE STREET CORP | $111,946 | 13,311 | Trimmed |
| 19 | CWM, LLC | $35,372 | 4,206 | New |
| 20 | UBS Group AG | $33,960 | 4,038 | Added |
| 21 | JPMORGAN CHASE & CO | $1,976 | 240 | New |
| 22 | Vanguard Global Advisers, LLC | $1,766 | 210 | New |
| 23 | Royal Bank of Canada | $1,000 | 91 | New |
| 24 | Key Financial Inc | $496 | 59 | Trimmed |
| 25 | Empery Asset Management, LP | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31