47 institutions reported holding $4.9M of XBIOTECH INC (XBIT) in SEC 13F filings for 2026-03-31. Largest institutional holders: BlackRock, Inc. ($688,795), GEODE CAPITAL MANAGEMENT, LLC ($543,173), VANGUARD CAPITAL MANAGEMENT LLC ($472,282), RBF Capital, LLC ($466,477), MORGAN STANLEY ($389,052). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | BlackRock, Inc. | $688,795 | 293,104 | Added |
| 2 | GEODE CAPITAL MANAGEMENT, LLC | $543,173 | 231,020 | Added |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | $472,282 | 200,971 | New |
| 4 | RBF Capital, LLC | $466,477 | 198,501 | Hold |
| 5 | MORGAN STANLEY | $389,052 | 165,554 | Added |
| 6 | MILLENNIUM MANAGEMENT LLC | $248,019 | 105,540 | Trimmed |
| 7 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $231,350 | 98,447 | Added |
| 8 | VANGUARD FIDUCIARY TRUST CO | $215,204 | 91,576 | New |
| 9 | NORTHERN TRUST CORP | $178,804 | 76,087 | Trimmed |
| 10 | STATE STREET CORP | $171,564 | 73,006 | Hold |
| 11 | JANE STREET GROUP, LLC | $141,235 | 60,100 | Trimmed |
| 12 | Empowered Funds, LLC | $139,935 | 59,547 | Hold |
| 13 | SIMPLEX TRADING, LLC | $108,335 | 46,100 | Added |
| 14 | Squarepoint Ops LLC | $96,853 | 41,214 | Trimmed |
| 15 | Bank of New York Mellon Corp | $92,485 | 39,355 | Trimmed |
| 16 | BANK OF AMERICA CORP /DE/ | $86,219 | 36,689 | Added |
| 17 | DIMENSIONAL FUND ADVISORS LP | $84,545 | 36,053 | Trimmed |
| 18 | Connor, Clark & Lunn Investment Management Ltd. | $67,358 | 28,663 | Trimmed |
| 19 | BNP PARIBAS FINANCIAL MARKETS | $63,835 | 27,164 | Added |
| 20 | NATIONAL BANK OF CANADA /FI/ | $58,750 | 25,000 | Hold |
| 21 | RENAISSANCE TECHNOLOGIES LLC | $52,729 | 22,438 | New |
| 22 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $49,585 | 21,100 | New |
| 23 | AMERICAN CENTURY COMPANIES INC | $44,370 | 18,881 | Hold |
| 24 | Qube Research & Technologies Ltd | $43,924 | 18,691 | Trimmed |
| 25 | XTX Topco Ltd | $42,067 | 17,901 | Trimmed |
Source: SEC Form 13F filings · as of 2026-03-31