X4 Pharmaceuticals, Inc - XFOR
Detailed investor-level table based on 13F positions.
Early Q1 2026 data: only 2 institutional holders reported so far. The full shareholder list will grow as more funds file with the SEC.
Methodology:
Market value and % of portfolio use SEC reported VALUE ($000).
For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received.
Details.
Rows: 0
| Investor | History | Status | Shares held | Market value ($000) | % of portfolio | Previous % | Rank | Change in shares | % change in shares | Source | Date reported |
|---|---|---|---|---|---|---|---|---|---|---|---|
| CAXTON CORP | History | New | 15,557 | 62,227 | 1.45% | — | 1 | +15,557 | New | Q4 2025 | Feb 13, 2026 |
| Empery Asset Management, LP | History | New | 8,951,105 | 35,804 | 31.57% | — | 2 | +8,951,105 | New | Q4 2025 | Feb 11, 2026 |
| FMR LLC | History | New | 8,499,100 | 33,996 | 0.0% | — | 3 | +8,499,100 | New | Q4 2025 | Feb 17, 2026 |
| MORGAN STANLEY | History | Added to | 8,208,015 | 32,832 | 0.0% | 0.0% | 4 | +8,204,287 | 220072.08% | Q4 2025 | Feb 13, 2026 |
| Bain Capital Life Sciences Investors, LLC | History | Added to | 7,967,454 | 31,869 | 2.44% | 0.55% | 5 | +5,530,866 | 226.99% | Q4 2025 | Feb 17, 2026 |
| PERCEPTIVE ADVISORS LLC | History | New | 6,314,452 | 25,257 | 0.45% | — | 6 | +6,314,452 | New | Q4 2025 | Feb 17, 2026 |
| Saturn V Capital Management LP | History | New | 5,800,530 | 23,202 | 4.26% | — | 7 | +5,800,530 | New | Q4 2025 | Feb 17, 2026 |
| Deep Track Capital, LP | History | Added to | 5,013,661 | 20,054 | 0.36% | 0.11% | 8 | +3,891,177 | 346.66% | Q4 2025 | Feb 13, 2026 |
| Kalehua Capital Management LLC | History | New | 3,722,840 | 14,891 | 14.73% | — | 9 | +3,722,840 | New | Q4 2025 | Feb 13, 2026 |
| VANGUARD GROUP INC | History | Added to | 3,423,662 | 13,694 | 0.0% | 0.0% | 10 | +3,013,177 | 734.05% | Q4 2025 | Jan 29, 2026 |
| BRAIDWELL LP | History | New | 3,368,904 | 13,475 | 0.43% | — | 11 | +3,368,904 | New | Q4 2025 | Feb 17, 2026 |
| Blackstone Inc. | History | New | 2,681,922 | 10,727 | 0.04% | — | 12 | +2,681,922 | New | Q4 2025 | Feb 17, 2026 |
| Rosalind Advisors, Inc. | History | Added to | 2,605,920 | 10,423 | 3.66% | 1.81% | 13 | +1,061,313 | 68.71% | Q4 2025 | Feb 12, 2026 |
| Trails Edge Capital Partners, LP | History | New | 2,571,478 | 10,285 | 2.54% | — | 14 | +2,571,478 | New | Q4 2025 | Feb 17, 2026 |
| Nantahala Capital Management, LLC | History | Added to | 2,449,468 | 9,797 | 0.32% | 0.26% | 15 | +221,118 | 9.92% | Q4 2025 | Feb 13, 2026 |
| BVF INC/IL | History | No change | 2,233,742 | 8,934 | 0.3% | 0.31% | 16 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| Samsara BioCapital, LLC | History | New | 1,960,000 | 7,840 | 0.81% | — | 17 | +1,960,000 | New | Q4 2025 | Feb 17, 2026 |
| Siren, L.L.C. | History | New | 1,500,000 | 6,000 | 0.18% | — | 18 | +1,500,000 | New | Q4 2025 | Feb 13, 2026 |
| BlackRock, Inc. | History | Added to | 1,226,808 | 4,907 | 0.0% | 0.0% | 19 | +1,164,874 | 1880.83% | Q4 2025 | Feb 12, 2026 |
| Woodline Partners LP | History | New | 1,000,855 | 4,003 | 0.02% | — | 20 | +1,000,855 | New | Q4 2025 | Feb 17, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | Added to | 940,447 | 3,763 | 0.0% | 0.0% | 21 | +860,789 | 1080.61% | Q4 2025 | Feb 09, 2026 |
| STEMPOINT CAPITAL LP | History | Added to | 898,465 | 3,593 | 0.62% | 0.38% | 22 | +343,054 | 61.77% | Q4 2025 | Feb 17, 2026 |
| GOLDMAN SACHS GROUP INC | History | New | 831,890 | 3,327 | 0.0% | — | 23 | +831,890 | New | Q4 2025 | Mar 25, 2026 |
| Point72 Asset Management, L.P. | History | Added to | 808,154 | 3,232 | 0.0% | 0.0% | 24 | +786,488 | 3630.06% | Q4 2025 | Feb 17, 2026 |
| Stonepine Capital Management, LLC | History | Reduced | 593,573 | 2,374 | 1.73% | 2.94% | 25 | -462,765 | -43.81% | Q4 2025 | Feb 13, 2026 |
| SILVERARC CAPITAL MANAGEMENT, LLC | History | New | 357,387 | 1,429 | 0.2% | — | 26 | +357,387 | New | Q4 2025 | Feb 12, 2026 |
| STATE STREET CORP | History | Added to | 198,234 | 792 | 0.0% | 0.0% | 27 | +159,500 | 411.78% | Q4 2025 | Feb 13, 2026 |
| GROUP ONE TRADING LLC | History | Reduced | 188,098 | 752 | 0.0% | 0.0% | 28 | -30,100 | -13.79% | Q4 2025 | Feb 12, 2026 |
| NORTHERN TRUST CORP | History | New | 178,235 | 712 | 0.0% | — | 29 | +178,235 | New | Q4 2025 | Feb 17, 2026 |
| Pale Fire Capital SE | History | Reduced | 167,590 | 670 | 0.04% | 0.07% | 30 | -13,261 | -7.33% | Q4 2025 | Feb 13, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | History | Added to | 150,035 | 600 | 0.0% | 0.0% | 31 | +22,135 | 17.31% | Q4 2025 | Feb 17, 2026 |
| Affinity Asset Advisors, LLC | History | New | 145,000 | 580 | 0.03% | — | 32 | +145,000 | New | Q4 2025 | Feb 13, 2026 |
| CITADEL ADVISORS LLC | History | New | 128,675 | 514 | 0.0% | — | 33 | +128,675 | New | Q4 2025 | Feb 17, 2026 |
| Palumbo Wealth Management LLC | History | Added to | 113,357 | 453 | 0.11% | 0.1% | 34 | +18,030 | 18.91% | Q4 2025 | Jan 21, 2026 |
| OMERS ADMINISTRATION Corp | History | New | 109,200 | 436 | 0.0% | — | 35 | +109,200 | New | Q4 2025 | Feb 13, 2026 |
| JANE STREET GROUP, LLC | History | New | 91,413 | 365 | 0.0% | — | 36 | +91,413 | New | Q4 2025 | Feb 12, 2026 |
| MARSHALL WACE, LLP | History | New | 80,456 | 321 | 0.0% | — | 37 | +80,456 | New | Q4 2025 | Feb 13, 2026 |
| ExodusPoint Capital Management, LP | History | New | 79,072 | 316 | 0.0% | — | 38 | +79,072 | New | Q4 2025 | Feb 17, 2026 |
| Qube Research & Technologies Ltd | History | New | 67,747 | 270 | 0.0% | — | 39 | +67,747 | New | Q4 2025 | Feb 17, 2026 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | History | New | 66,788 | 267 | 0.0% | — | 40 | +66,788 | New | Q4 2025 | Feb 13, 2026 |
| BALYASNY ASSET MANAGEMENT L.P. | History | New | 64,505 | 258 | 0.0% | — | 41 | +64,505 | New | Q4 2025 | Feb 17, 2026 |
| BARCLAYS PLC | History | New | 57,500 | 230 | 0.0% | — | 42 | +57,500 | New | Q4 2025 | Feb 13, 2026 |
| MILLENNIUM MANAGEMENT LLC | History | Reduced | 55,978 | 223 | 0.0% | 0.0% | 43 | -8,817 | -13.61% | Q4 2025 | Feb 17, 2026 |
| Susquehanna Portfolio Strategies, LLC | History | New | 43,259 | 173 | 0.0% | — | 44 | +43,259 | New | Q4 2025 | Feb 17, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Added to | 35,761 | 143 | 0.0% | 0.0% | 45 | +16,457 | 85.25% | Q4 2025 | Feb 17, 2026 |
| CITIGROUP INC | History | Added to | 32,332 | 129 | 0.0% | — | 46 | +32,300 | 100937.5% | Q4 2025 | Feb 13, 2026 |
| Hudson Bay Capital Management LP | History | New | 32,239 | 128 | 0.0% | — | 47 | +32,239 | New | Q4 2025 | Feb 13, 2026 |
| Jefferies Financial Group Inc. | History | New | 26,118 | 104 | 0.0% | — | 48 | +26,118 | New | Q4 2025 | Feb 09, 2026 |
| Man Group plc | History | New | 24,187 | 96 | 0.0% | — | 49 | +24,187 | New | Q4 2025 | Feb 17, 2026 |
| Virtu Financial LLC | History | New | 22,489 | 90 | 0.0% | — | 50 | +22,489 | New | Q4 2025 | Feb 23, 2026 |
| Lighthouse Investment Partners, LLC | History | New | 22,200 | 88 | 0.0% | — | 51 | +22,200 | New | Q4 2025 | Feb 17, 2026 |
| STIFEL FINANCIAL CORP | History | New | 20,496 | 81 | 0.0% | — | 52 | +20,496 | New | Q4 2025 | Feb 13, 2026 |
| TWO SIGMA INVESTMENTS, LP | History | Added to | 17,246 | 68 | 0.0% | 0.0% | 53 | +3,378 | 24.36% | Q4 2025 | Feb 17, 2026 |
| Creative Planning | History | New | 16,427 | 65 | 0.0% | — | 54 | +16,427 | New | Q4 2025 | Feb 17, 2026 |
| Squarepoint Ops LLC | History | New | 12,518 | 50 | 0.0% | — | 55 | +12,518 | New | Q4 2025 | Feb 13, 2026 |
| Tower Research Capital LLC (TRC) | History | Reduced | 10,446 | 41 | 0.0% | 0.0% | 56 | -233 | -2.18% | Q4 2025 | Feb 17, 2026 |
| Indivisible Partners | History | New | 10,000 | 40 | 0.0% | — | 57 | +10,000 | New | Q4 2025 | Feb 03, 2026 |
| JPMORGAN CHASE & CO | History | Added to | 4,581 | 18 | 0.0% | — | 58 | +4,548 | 13781.82% | Q4 2025 | Feb 11, 2026 |
| UBS Group AG | History | Reduced | 4,129 | 16 | 0.0% | 0.0% | 59 | -155,706 | -97.42% | Q4 2025 | Jan 29, 2026 |
| SIGNATUREFD, LLC | History | New | 2,754 | 11 | 0.0% | — | 60 | +2,754 | New | Q4 2025 | Jan 20, 2026 |
| CIBC Private Wealth Group LLC | History | No change | 2,166 | 8 | 0.0% | 0.0% | 61 | 0 | 0.0% | Q4 2025 | Feb 12, 2026 |
| PNC FINANCIAL SERVICES GROUP, INC. | History | No change | 1,759 | 7 | 0.0% | 0.0% | 62 | 0 | 0.0% | Q4 2025 | Feb 06, 2026 |
| Allworth Financial LP | History | New | 715 | 2 | 0.0% | — | 64 | +715 | New | Q4 2025 | Feb 05, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | Reduced | 511 | 2 | 0.0% | 0.0% | 63 | -43 | -7.76% | Q4 2025 | Feb 10, 2026 |
| Russell Investments Group, Ltd. | History | No change | 729 | 2 | 0.0% | 0.0% | 65 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| Bleichroeder LP | History | No change | 595 | 2 | 0.0% | 0.0% | 66 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| Farther Finance Advisors, LLC | History | New | 331 | 1 | 0.0% | — | 68 | +331 | New | Q4 2025 | Jan 23, 2026 |
| Blue Trust, Inc. | History | No change | 284 | 1 | 0.0% | — | 67 | 0 | 0.0% | Q4 2025 | Jan 16, 2026 |
| KINGDON CAPITAL MANAGEMENT, L.L.C. | History | Closed out | 0 | 0 | — | 0.4% | — | -933,332 | -100.0% | Q3 2025 | Nov 14, 2025 |
| BOOTHBAY FUND MANAGEMENT, LLC | History | Closed out | 0 | 0 | — | 0.02% | — | -343,963 | -100.0% | Q3 2025 | Nov 14, 2025 |
| RENAISSANCE TECHNOLOGIES LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -19,177 | -100.0% | Q3 2025 | Nov 13, 2025 |
| TD Waterhouse Canada Inc. | History | Closed out | 0 | 0 | — | 0.0% | — | -1,500 | -100.0% | Q3 2025 | Nov 03, 2025 |
| SBI Securities Co., Ltd. | History | Reduced | 50 | 0 | — | — | — | -166 | -76.85% | Q4 2025 | Feb 03, 2026 |
| Fortitude Family Office, LLC | History | New | 137 | 0 | — | — | — | +137 | New | Q4 2025 | Jan 15, 2026 |
| ROYAL BANK OF CANADA | History | New | 104 | 0 | — | — | — | +104 | New | Q4 2025 | Feb 17, 2026 |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | History | New | 5 | 0 | — | — | — | +5 | New | Q4 2025 | Feb 10, 2026 |
| JONES FINANCIAL COMPANIES LLLP | History | No change | 38 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| NewEdge Advisors, LLC | History | No change | 33 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 18, 2026 |
| Rockefeller Capital Management L.P. | History | No change | 33 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Mar 16, 2026 |
| HighMark Wealth Management LLC | History | No change | 6 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 05, 2026 |