95 institutions reported holding $407.0M of X4 PHARMACEUTICALS INC (XFOR) in SEC 13F filings for 2026-03-31. Largest institutional holders: MORGAN STANLEY ($39.1M), Empery Asset Management, LP ($36.9M), FMR LLC ($33.5M), Bain Capital Life Sciences Investors, LLC ($32.9M), Kalehua Capital Management LLC ($30.8M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | MORGAN STANLEY | $39.1M | 9.5M | Added |
| 2 | Empery Asset Management, LP | $36.9M | 8.9M | Trimmed |
| 3 | FMR LLC | $33.5M | 8.1M | Trimmed |
| 4 | Bain Capital Life Sciences Investors, LLC | $32.9M | 8.0M | Hold |
| 5 | Kalehua Capital Management LLC | $30.8M | 7.4M | Added |
| 6 | PERCEPTIVE ADVISORS LLC | $27.8M | 6.7M | Added |
| 7 | Saturn V Capital Management LP | $26.7M | 6.5M | Added |
| 8 | Deep Track Capital, LP | $26.2M | 6.3M | Added |
| 9 | VANGUARD CAPITAL MANAGEMENT LLC | $14.4M | 3.5M | New |
| 10 | BRAIDWELL LP | $13.5M | 3.3M | Trimmed |
| 11 | NEA Management Company, LLC | $13.4M | 3.2M | Hold |
| 12 | Rosalind Advisors, Inc. | $13.3M | 3.2M | Added |
| 13 | Blackstone Inc. | $11.1M | 2.7M | Hold |
| 14 | Trails Edge Capital Partners, LP | $10.6M | 2.6M | Hold |
| 15 | Nantahala Capital Management, LLC | $10.1M | 2.4M | Hold |
| 16 | BVF INC/IL | $9.2M | 2.2M | Hold |
| 17 | SAMSARA BIOCAPITAL, LLC | $7.6M | 1.8M | Trimmed |
| 18 | STEMPOINT CAPITAL LP | $7.0M | 1.7M | Added |
| 19 | BlackRock, Inc. | $5.0M | 1.2M | Trimmed |
| 20 | MILLENNIUM MANAGEMENT LLC | $5.0M | 1.2M | Added |
| 21 | Woodline Partners LP | $4.1M | 1.0M | Added |
| 22 | GEODE CAPITAL MANAGEMENT, LLC | $3.9M | 939,726 | Trimmed |
| 23 | GOLDMAN SACHS GROUP INC | $3.6M | 882,134 | Added |
| 24 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $3.5M | 856,222 | Added |
| 25 | VANGUARD FIDUCIARY TRUST CO | $2.0M | 480,733 | New |
Source: SEC Form 13F filings · as of 2026-03-31