| 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 | 15% | $29,402,636 | 8,499,100 | FMR LLC | 31 Oct 2025 | |||
| PERCEPTIVE ADVISORS LLC | 7.6% | $20,980,760 | 6,064,680 | Perceptive Advisors LLC | 27 Oct 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 |
| Coastlands Capital LP | 10% | 0% | $7,773,911 | +$37,418 | 2,491,638 | +0.48% | Coastlands Capital LP | 03 Oct 2025 |
| Bain Capital Life Sciences Fund, L.P. | 10% | 0% | $7,139,203 | +$182 | 2,436,588 | +0% | Bain Capital Life Sciences Fund, L.P. | 09 Sep 2025 |
| Deep Track Capital, LP | 10% | $4,568,300 | 2,366,995 | Deep Track Capital, LP | 12 Aug 2025 | |||
| Trails Edge Capital Partners, LP | 9.9% | $4,472,105 | 2,317,153 | Trails Edge Capital Partners, LP | 11 Aug 2025 | |||
| Nantahala Capital Management, LLC | 10% | $7,678,489 | 2,244,319 | Nantahala Capital Management, LLC | 30 Sep 2025 | |||
| BIOTECHNOLOGY VALUE FUND L P | 9.9% | $4,330,262 | 2,243,659 | BVF PARTNERS L P/IL | 13 Aug 2025 | |||
| BlackRock, Inc. | 3% | $377,954 | 179,125 | BlackRock, Inc. | 30 Jun 2025 |
As of 30 Sep 2025, 40 institutional investors reported holding 13,652,105 shares of X4 Pharmaceuticals, Inc - Common Stock, $0.001 par value per share (XFOR). This represents 15% of the company’s total 90,529,469 outstanding shares.
The largest institutional shareholders of X4 Pharmaceuticals, Inc - Common Stock, $0.001 par value per share (XFOR) together control 15% 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 |
|---|---|---|---|---|---|
| Bain Capital Life Sciences Investors, LLC | 2.7% | 2,436,588 | +332% | 0.55% | $8,333,131 |
| BVF INC/IL | 2.5% | 2,233,742 | 0.31% | $7,639,398 | |
| Nantahala Capital Management, LLC | 2.5% | 2,228,350 | 0.47% | $7,620,957 | |
| Rosalind Advisors, Inc. | 1.7% | 1,544,607 | 1.9% | $5,282,555 | |
| Deep Track Capital, LP | 1.2% | 1,122,484 | 0.11% | $3,838,895 | |
| Stonepine Capital Management, LLC | 1.2% | 1,056,338 | 2.9% | $3,612,676 | |
| KINGDON CAPITAL MANAGEMENT, L.L.C. | 1% | 933,332 | +300% | 0.5% | $3,191,995 |
| STEMPOINT CAPITAL LP | 0.61% | 555,411 | 0.38% | $1,899,506 | |
| VANGUARD GROUP INC | 0.45% | 410,485 | +77% | 0% | $1,403,859 |
| BOOTHBAY FUND MANAGEMENT, LLC | 0.38% | 343,963 | 0.03% | $1,176,353 | |
| Pale Fire Capital SE | 0.2% | 180,851 | +201% | 0.07% | $618,510 |
| UBS Group AG | 0.18% | 159,835 | +45% | 0% | $546,635 |
| Palumbo Wealth Management LLC | 0.11% | 95,327 | 0.11% | $326,019 | |
| GEODE CAPITAL MANAGEMENT, LLC | 0.09% | 79,658 | +62% | 0% | $272,472 |
| MILLENNIUM MANAGEMENT LLC | 0.07% | 64,795 | -17% | 0% | $221,599 |
| BlackRock, Inc. | 0.07% | 61,934 | -65% | 0% | $211,814 |
| STATE STREET CORP | 0.04% | 38,734 | +149% | 0% | $132,470 |
| Point72 Asset Management, L.P. | 0.02% | 21,666 | -0% | 0% | $74,098 |
| BANK OF AMERICA CORP /DE/ | 0.02% | 19,304 | -76% | 0% | $66,020 |
| RENAISSANCE TECHNOLOGIES LLC | 0.02% | 19,177 | +10% | 0% | $65,585 |
| TWO SIGMA INVESTMENTS, LP | 0.02% | 13,868 | 0% | $47,429 | |
| Tower Research Capital LLC (TRC) | 0.01% | 10,679 | +105% | 0% | $36,522 |
| GROUP ONE TRADING LLC | 0% | 3,998 | 0% | 0% | $13,673 |
| MORGAN STANLEY | 0% | 3,728 | -66% | 0% | $12,750 |
| Point72 Asia (Singapore) Pte. Ltd. | 0% | 2,914 | 0% | $9,966 |