X4 Pharmaceuticals, Inc - XFOR
Detailed investor-level table based on 13F positions.
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MORGAN STANLEY | History | Added to | 9,466,992 | 39,098 | 0.0% | 0.0% | 1 | +1,258,977 | 15.34% | Q1 2026 | May 15, 2026 |
| Empery Asset Management, LP | History | Reduced | 8,944,118 | 36,939 | 44.5% | 31.57% | 2 | -6,987 | -0.08% | Q1 2026 | May 08, 2026 |
| FMR LLC | History | Reduced | 8,103,400 | 33,467 | 0.0% | 0.0% | 3 | -395,700 | -4.66% | Q1 2026 | May 15, 2026 |
| Bain Capital Life Sciences Investors, LLC | History | No change | 7,967,454 | 32,905 | 2.97% | 2.44% | 4 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| PERCEPTIVE ADVISORS LLC | History | Added to | 6,737,648 | 27,826 | 0.54% | 0.45% | 5 | +423,196 | 6.7% | Q1 2026 | May 29, 2026 |
| Saturn V Capital Management LP | History | Added to | 6,456,646 | 26,665 | 4.83% | 4.26% | 6 | +656,116 | 11.31% | Q1 2026 | May 15, 2026 |
| Deep Track Capital, LP | History | Added to | 6,339,535 | 26,182 | 0.43% | 0.36% | 7 | +1,325,874 | 26.45% | Q1 2026 | May 15, 2026 |
| Kalehua Capital Management LLC | History | No change | 3,722,840 | 15,375 | 12.96% | 14.73% | 8 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | History | New | 3,497,612 | 14,445 | 0.0% | — | 9 | +3,497,612 | New | Q1 2026 | May 15, 2026 |
| VANGUARD GROUP INC | History | No change | 3,423,662 | 13,694 | 0.0% | 0.0% | 10 | 0 | 0.0% | Q4 2025 | Jan 29, 2026 |
| BRAIDWELL LP | History | Reduced | 3,272,954 | 13,517 | 0.45% | 0.43% | 11 | -95,950 | -2.85% | Q1 2026 | May 15, 2026 |
| Rosalind Advisors, Inc. | History | Added to | 3,214,766 | 13,276 | 5.33% | 3.66% | 12 | +608,846 | 23.36% | Q1 2026 | May 14, 2026 |
| Blackstone Inc. | History | No change | 2,681,922 | 11,076 | 0.04% | 0.04% | 13 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| Trails Edge Capital Partners, LP | History | No change | 2,571,478 | 10,620 | 2.43% | 2.54% | 14 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| Nantahala Capital Management, LLC | History | No change | 2,449,468 | 10,116 | 0.37% | 0.32% | 15 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| BVF INC/IL | History | No change | 2,233,742 | 9,225 | 0.29% | 0.3% | 16 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| Samsara BioCapital, LLC | History | Reduced | 1,832,566 | 7,568 | 0.74% | 0.81% | 17 | -127,434 | -6.5% | Q1 2026 | May 15, 2026 |
| BlackRock, Inc. | History | Reduced | 1,211,794 | 5,004 | 0.0% | 0.0% | 18 | -15,014 | -1.22% | Q1 2026 | May 13, 2026 |
| MILLENNIUM MANAGEMENT LLC | History | Added to | 1,210,514 | 4,999 | 0.0% | 0.0% | 19 | +1,154,536 | 2062.48% | Q1 2026 | May 15, 2026 |
| Woodline Partners LP | History | Added to | 1,001,095 | 4,134 | 0.02% | 0.02% | 20 | +240 | 0.02% | Q1 2026 | May 15, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | Reduced | 939,726 | 3,883 | 0.0% | 0.0% | 21 | -721 | -0.08% | Q1 2026 | May 15, 2026 |
| GOLDMAN SACHS GROUP INC | History | Added to | 882,134 | 3,643 | 0.0% | 0.0% | 22 | +50,244 | 6.04% | Q1 2026 | May 15, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | History | Added to | 856,222 | 3,536 | 0.0% | 0.0% | 23 | +706,187 | 470.68% | Q1 2026 | May 15, 2026 |
| STEMPOINT CAPITAL LP | History | Reduced | 850,742 | 3,513 | 0.68% | 0.62% | 24 | -47,723 | -5.31% | Q1 2026 | May 15, 2026 |
| VANGUARD FIDUCIARY TRUST CO | History | New | 480,733 | 1,985 | 0.0% | — | 25 | +480,733 | New | Q1 2026 | May 08, 2026 |
| STATE STREET CORP | History | Added to | 403,534 | 1,666 | 0.0% | 0.0% | 26 | +205,300 | 103.56% | Q1 2026 | May 15, 2026 |
| MARSHALL WACE, LLP | History | Added to | 336,834 | 1,391 | 0.0% | 0.0% | 27 | +256,378 | 318.66% | Q1 2026 | May 14, 2026 |
| Stonepine Capital Management, LLC | History | Reduced | 335,309 | 1,384 | 0.55% | 1.73% | 28 | -258,264 | -43.51% | Q1 2026 | May 14, 2026 |
| Venrock Adviser, LLC | History | New | 330,525 | 1,365 | 0.05% | — | 29 | +330,525 | New | Q1 2026 | May 15, 2026 |
| UBS Group AG | History | Added to | 267,340 | 1,104 | 0.0% | 0.0% | 30 | +263,211 | 6374.69% | Q1 2026 | May 05, 2026 |
| Qube Research & Technologies Ltd | History | Added to | 218,954 | 904 | 0.0% | 0.0% | 31 | +151,207 | 223.19% | Q1 2026 | May 15, 2026 |
| NORTHERN TRUST CORP | History | No change | 178,235 | 736 | 0.0% | 0.0% | 32 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| Pale Fire Capital SE | History | No change | 167,590 | 692 | 0.06% | 0.04% | 33 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Added to | 150,676 | 622 | 0.0% | 0.0% | 34 | +114,915 | 321.34% | Q1 2026 | May 15, 2026 |
| Affinity Asset Advisors, LLC | History | No change | 145,000 | 598 | 0.03% | 0.03% | 35 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| Palumbo Wealth Management LLC | History | Added to | 131,014 | 541 | 0.13% | 0.11% | 36 | +17,657 | 15.58% | Q1 2026 | May 12, 2026 |
| Brevan Howard Capital Management LP | History | New | 127,321 | 525 | 0.0% | — | 37 | +127,321 | New | Q1 2026 | May 15, 2026 |
| Susquehanna Portfolio Strategies, LLC | History | Added to | 102,599 | 423 | 0.01% | 0.0% | 38 | +59,340 | 137.17% | Q1 2026 | May 15, 2026 |
| Dynamic Technology Lab Private Ltd | History | New | 36,221 | 384 | 0.06% | — | 39 | +36,221 | New | Q1 2026 | May 15, 2026 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | History | Reduced | 66,749 | 275 | 0.0% | 0.0% | 40 | -39 | -0.06% | Q1 2026 | May 15, 2026 |
| OMERS ADMINISTRATION Corp | History | Reduced | 57,300 | 236 | 0.0% | 0.0% | 41 | -51,900 | -47.53% | Q1 2026 | May 15, 2026 |
| Hudson Bay Capital Management LP | History | Added to | 50,287 | 207 | 0.0% | 0.0% | 42 | +18,048 | 55.98% | Q1 2026 | May 13, 2026 |
| Catalyst Funds Management Pty Ltd | History | New | 47,383 | 195 | 0.03% | — | 43 | +47,383 | New | Q1 2026 | May 11, 2026 |
| JANE STREET GROUP, LLC | History | Reduced | 37,143 | 153 | 0.0% | 0.0% | 44 | -54,270 | -59.37% | Q1 2026 | May 12, 2026 |
| CITIGROUP INC | History | Added to | 35,765 | 147 | 0.0% | 0.0% | 45 | +3,433 | 10.62% | Q1 2026 | May 11, 2026 |
| Vanguard Global Advisers, LLC | History | New | 32,977 | 136 | 0.0% | — | 46 | +32,977 | New | Q1 2026 | May 08, 2026 |
| Diametric Capital, LP | History | New | 28,973 | 119 | 0.03% | — | 47 | +28,973 | New | Q1 2026 | May 15, 2026 |
| STIFEL FINANCIAL CORP | History | Added to | 21,789 | 89 | 0.0% | 0.0% | 48 | +1,293 | 6.31% | Q1 2026 | May 12, 2026 |
| Invesco Ltd. | History | New | 19,968 | 82 | 0.0% | — | 49 | +19,968 | New | Q1 2026 | May 12, 2026 |
| Schonfeld Strategic Advisors LLC | History | New | 19,514 | 80 | 0.0% | — | 51 | +19,514 | New | Q1 2026 | May 15, 2026 |
| Jefferies Financial Group Inc. | History | Reduced | 19,474 | 80 | 0.0% | 0.0% | 50 | -6,644 | -25.44% | Q1 2026 | May 07, 2026 |
| CAXTON CORP | History | No change | 15,557 | 64 | 1.59% | 1.45% | 52 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| ExodusPoint Capital Management, LP | History | Reduced | 14,703 | 60 | 0.0% | 0.0% | 53 | -64,369 | -81.41% | Q1 2026 | May 14, 2026 |
| TWO SIGMA INVESTMENTS, LP | History | Reduced | 13,868 | 57 | 0.0% | 0.0% | 54 | -3,378 | -19.59% | Q1 2026 | May 15, 2026 |
| Creative Planning | History | Reduced | 13,819 | 57 | 0.0% | 0.0% | 55 | -2,608 | -15.88% | Q1 2026 | May 12, 2026 |
| Virtu Financial LLC | History | Reduced | 12,730 | 53 | 0.0% | 0.0% | 56 | -9,759 | -43.39% | Q1 2026 | May 14, 2026 |
| Jump Financial, LLC | History | New | 12,317 | 50 | 0.0% | — | 57 | +12,317 | New | Q1 2026 | May 14, 2026 |
| Vanguard Personalized Indexing Management, LLC | History | New | 11,525 | 47 | 0.0% | — | 58 | +11,525 | New | Q1 2026 | May 14, 2026 |
| SummitTX Capital, L.P. | History | New | 11,200 | 46 | 0.0% | — | 59 | +11,200 | New | Q1 2026 | May 15, 2026 |
| WINTON GROUP Ltd | History | New | 10,600 | 43 | 0.0% | — | 60 | +10,600 | New | Q1 2026 | May 12, 2026 |
| Indivisible Partners | History | No change | 10,000 | 37 | 0.0% | 0.0% | 61 | 0 | 0.0% | Q1 2026 | Apr 30, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | Added to | 4,756 | 19 | 0.0% | 0.0% | 62 | +4,245 | 830.72% | Q1 2026 | May 12, 2026 |
| BARCLAYS PLC | History | Reduced | 2,814 | 11 | 0.0% | 0.0% | 63 | -54,686 | -95.11% | Q1 2026 | May 14, 2026 |
| SIGNATUREFD, LLC | History | Reduced | 1,996 | 8 | 0.0% | 0.0% | 65 | -758 | -27.52% | Q1 2026 | Apr 07, 2026 |
| CIBC Private Wealth Group LLC | History | No change | 2,166 | 8 | 0.0% | 0.0% | 64 | 0 | 0.0% | Q4 2025 | Feb 12, 2026 |
| PNC FINANCIAL SERVICES GROUP, INC. | History | No change | 1,759 | 7 | 0.0% | 0.0% | 66 | 0 | 0.0% | Q1 2026 | May 08, 2026 |
| State of Wyoming | History | New | 1,065 | 4 | 0.0% | — | 67 | +1,065 | New | Q1 2026 | May 13, 2026 |
| ACADIAN ASSET MANAGEMENT LLC | History | New | 802 | 3 | 0.0% | — | 69 | +802 | New | Q1 2026 | May 13, 2026 |
| Russell Investments Group, Ltd. | History | No change | 729 | 3 | 0.0% | 0.0% | 68 | 0 | 0.0% | Q1 2026 | May 08, 2026 |
| GROUP ONE TRADING LLC | History | Reduced | 712 | 2 | 0.0% | 0.0% | 70 | -187,386 | -99.62% | Q1 2026 | May 13, 2026 |
| Bleichroeder LP | History | No change | 595 | 2 | 0.0% | 0.0% | 71 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| Allworth Financial LP | History | Reduced | 310 | 1 | 0.0% | 0.0% | 72 | -405 | -56.64% | Q1 2026 | May 14, 2026 |
| Blue Trust, Inc. | History | No change | 284 | 1 | 0.0% | 0.0% | 73 | 0 | 0.0% | Q1 2026 | Apr 20, 2026 |
| Farther Finance Advisors, LLC | History | No change | 331 | 1 | 0.0% | 0.0% | 74 | 0 | 0.0% | Q1 2026 | Apr 07, 2026 |
| Siren, L.L.C. | History | Closed out | 0 | 0 | — | 0.18% | — | -1,500,000 | -100.0% | Q1 2026 | May 14, 2026 |
| Point72 Asset Management, L.P. | History | Closed out | 0 | 0 | — | 0.0% | — | -808,154 | -100.0% | Q1 2026 | May 15, 2026 |
| SILVERARC CAPITAL MANAGEMENT, LLC | History | Closed out | 0 | 0 | — | 0.2% | — | -357,387 | -100.0% | Q1 2026 | May 14, 2026 |
| CITADEL ADVISORS LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -128,675 | -100.0% | Q1 2026 | May 15, 2026 |
| BALYASNY ASSET MANAGEMENT L.P. | History | Closed out | 0 | 0 | — | 0.0% | — | -64,505 | -100.0% | Q1 2026 | May 15, 2026 |
| Man Group plc | History | Closed out | 0 | 0 | — | 0.0% | — | -24,187 | -100.0% | Q1 2026 | May 15, 2026 |
| Lighthouse Investment Partners, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -22,200 | -100.0% | Q1 2026 | May 14, 2026 |
| Squarepoint Ops LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -12,518 | -100.0% | Q1 2026 | May 15, 2026 |
| Tower Research Capital LLC (TRC) | History | Reduced | 180 | 0 | — | 0.0% | — | -10,266 | -98.28% | Q1 2026 | May 15, 2026 |
| JPMORGAN CHASE & CO | History | Reduced | 33 | 0 | — | 0.0% | — | -4,548 | -99.28% | Q1 2026 | May 13, 2026 |
| Fortitude Family Office, LLC | History | Closed out | 0 | 0 | — | — | — | -137 | -100.0% | Q1 2026 | Apr 15, 2026 |
| QUADRANT CAPITAL GROUP LLC | History | New | 128 | 0 | — | — | — | +128 | New | Q1 2026 | May 13, 2026 |
| Parallel Advisors, LLC | History | New | 116 | 0 | — | — | — | +116 | New | Q1 2026 | May 07, 2026 |
| NewEdge Advisors, LLC | History | Closed out | 0 | 0 | — | — | — | -33 | -100.0% | Q1 2026 | May 15, 2026 |
| ROYAL BANK OF CANADA | History | Added to | 115 | 0 | — | — | — | +11 | 10.58% | Q1 2026 | May 15, 2026 |
| SBI Securities Co., Ltd. | History | Added to | 54 | 0 | — | — | — | +4 | 8.0% | Q1 2026 | Apr 27, 2026 |
| JONES FINANCIAL COMPANIES LLLP | History | No change | 38 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | History | No change | 5 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 07, 2026 |
| Rockefeller Capital Management L.P. | History | No change | 33 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| HighMark Wealth Management LLC | History | No change | 6 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 05, 2026 |