| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Empery Asset Management, LP | 10% | 0% | $35,180,748 | +$25,462,897 | 9,043,894 | +262% | Empery Asset Management, LP | 31 Dec 2025 |
| FMR LLC | 9.7% | $33,996,400 | 8,499,100 | FMR LLC | 31 Oct 2025 | |||
| MORGAN STANLEY | 9.4% | $31,884,342 | 8,196,489 | Morgan Stanley | 31 Dec 2025 | |||
| Saturn V Capital Management LP | 7.4% | $25,026,241 | 6,433,481 | Saturn V Capital Management LP | 24 Oct 2025 | |||
| PERCEPTIVE ADVISORS LLC | 7.6% | $20,980,760 | 6,064,680 | Perceptive Advisors LLC | 27 Oct 2025 | |||
| Trails Edge Capital Partners, LP | 5.8% | -41% | $20,333,894 | +$11,320,168 | 5,227,222 | +126% | Trails Edge Capital Partners, LP | 31 Dec 2025 |
| Growth Equity Opportunities 18 VGE, LLC | 6.2% | -38% | $17,496,802 | +$9,734,867 | 5,057,610 | +125% | Growth Equity Opportunities 18 VGE, LLC | 27 Oct 2025 |
| BIOTECHNOLOGY VALUE FUND L P | 3.9% | -60% | $13,272,653 | +$4,544,819 | 3,411,993 | +52% | BVF PARTNERS L P/IL | 31 Dec 2025 |
| Coastlands Capital LP | 10% | 0% | $7,773,911 | +$37,418 | 2,491,638 | +0.48% | Coastlands Capital LP | 03 Oct 2025 |
| Nantahala Capital Management, LLC | 2.8% | -72% | $9,528,431 | +$798,030 | 2,449,468 | +9.1% | Nantahala Capital Management, LLC | 31 Dec 2025 |
| Deep Track Capital, LP | 10% | $4,568,300 | 2,366,995 | Deep Track Capital, LP | 12 Aug 2025 | |||
| BlackRock, Inc. | 3% | $377,954 | 179,125 | BlackRock, Inc. | 30 Jun 2025 |
As of 31 Dec 2025, 75 institutional investors reported holding 85,919,846 shares of X4 Pharmaceuticals, Inc - Common Stock, par value $0.001 per share (XFOR). This represents 98% of the company’s total 87,487,000 outstanding shares.
The largest institutional shareholders of X4 Pharmaceuticals, Inc - Common Stock, par value $0.001 per share (XFOR) together control 96% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| Empery Asset Management, LP | 10% | 8,951,105 | 0% | 32% | $35,804,420 |
| FMR LLC | 9.7% | 8,499,100 | 0% | $33,996,400 | |
| MORGAN STANLEY | 9.4% | 8,208,015 | +220072% | 0% | $32,832,060 |
| Bain Capital Life Sciences Investors, LLC | 9.1% | 7,967,454 | +227% | 2.4% | $31,869,816 |
| PERCEPTIVE ADVISORS LLC | 7.2% | 6,314,452 | 0.46% | $25,257,808 | |
| Saturn V Capital Management LP | 6.6% | 5,800,530 | 4.3% | $23,202,120 | |
| Deep Track Capital, LP | 5.7% | 5,013,661 | +347% | 0.46% | $20,054,644 |
| Kalehua Capital Management LLC | 4.3% | 3,722,840 | 0% | 15% | $14,891,360 |
| VANGUARD GROUP INC | 3.9% | 3,423,662 | +734% | 0% | $13,694,648 |
| BRAIDWELL LP | 3.9% | 3,368,904 | 0.43% | $13,475,616 | |
| Blackstone Inc. | 3.1% | 2,681,922 | 0.05% | $10,727,688 | |
| Rosalind Advisors, Inc. | 3% | 2,605,920 | +69% | 4% | $10,423,680 |
| Trails Edge Capital Partners, LP | 2.9% | 2,571,478 | 0% | 2.5% | $10,285,912 |
| Nantahala Capital Management, LLC | 2.8% | 2,449,468 | +9.9% | 0.58% | $9,797,872 |
| BVF INC/IL | 2.6% | 2,233,742 | 0% | 0.3% | $8,934,968 |
| SAMSARA BIOCAPITAL, LLC | 2.2% | 1,960,000 | 0.81% | $7,840,000 | |
| Siren, L.L.C. | 1.7% | 1,500,000 | 0.18% | $6,000,000 | |
| BlackRock, Inc. | 1.4% | 1,226,808 | +1881% | 0% | $4,907,232 |
| Woodline Partners LP | 1.1% | 1,000,855 | 0.02% | $4,003,420 | |
| GEODE CAPITAL MANAGEMENT, LLC | 1.1% | 940,447 | +1081% | 0% | $3,763,835 |
| STEMPOINT CAPITAL LP | 1% | 898,465 | +62% | 0.62% | $3,593,860 |
| GOLDMAN SACHS GROUP INC | 0.95% | 831,890 | 0% | $3,327,560 | |
| Point72 Asset Management, L.P. | 0.92% | 808,154 | +3630% | 0.01% | $3,232,616 |
| Stonepine Capital Management, LLC | 0.68% | 593,573 | -44% | 1.9% | $2,374,292 |
| SILVERARC CAPITAL MANAGEMENT, LLC | 0.41% | 357,387 | 0.21% | $1,429,548 |