X4 PharmaceuticalsXFOR
13F holders, Q1 2026 (March 31)82holders +6
15new positions
10sold out
1famous investor
$4.13avg. 13F price*
At the end of Q1 2026, 82 institutions reported holding X4 Pharmaceuticals Inc. (XFOR) in their 13F filings, up 6 from Q4 2025. 15 opened new positions and 10 sold out. The largest holders were Morgan Stanley ($39.1M), Empery Asset Management, LP ($36.9M) and FMR LLC ($33.5M). One famous investor held it Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- X4 Pharmaceuticals Inc.
- CUSIP
- 98420X202
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 15 | $3.0M |
| Exits | 10 | $11.7M |
All 13F filers, Q4 2025 → Q1 2026: 8,064,816 shares bought and 4,132,505 shares sold, net +3,932,311 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 82 holders
| Morgan Stanley | 0.00% | Add +15.3% | 9,466,992 | $39.1M |
| Empery Asset Management, LP | 44.82% | Reduce -0.1% | 8,944,118 | $36.9M |
| FMR LLC | 0.00% | Reduce -4.7% | 8,103,400 | $33.5M |
| Bain Capital Life Sciences Investors, LLC | 2.97% | No change | 7,967,454 | $32.9M |
| Perceptive Advisors LLC | 0.55% | Add +6.7% | 6,737,648 | $27.8M |
| Saturn V Capital Management LP | 4.83% | Add +11.3% | 6,456,646 | $26.7M |
| Deep Track Capital, LP | 0.54% | Add +26.4% | 6,339,535 | $26.2M |
| Kalehua Capital Management LLC | 10.88% | No change | 3,722,840 | $15.4M |
| Vanguard Capital Management LLC | 0.00% | — | 3,497,612 | $14.4M |
| Braidwell LP | 0.51% | Reduce -2.9% | 3,272,954 | $13.5M |
| Rosalind Advisors, Inc. | 5.44% | Add +23.4% | 3,214,766 | $13.3M |
| Blackstone Inc. | 0.05% | No change | 2,681,922 | $11.1M |
| Trails Edge Capital Partners, LP | 2.50% | No change | 2,571,478 | $10.6M |
| Nantahala Capital Management, LLC | 0.63% | No change | 2,449,468 | $10.1M |
| BVF Inc. | 0.29% | No change | 2,233,742 | $9.2M |
| Samsara Biocapital, LLC | 0.74% | Reduce -6.5% | 1,832,566 | $7.6M |
| BlackRock, Inc. | 0.00% | Reduce -1.2% | 1,211,794 | $5.0M |
| Millennium Management | 0.00% | Add +2062.5% | 1,210,514 | $5.0M |
| Woodline Partners LP | 0.02% | Add +0.0% | 1,001,095 | $4.1M |
| Geode Capital Management, LLC | 0.00% | Reduce -0.1% | 939,726 | $3.9M |
| Goldman Sachs Group Inc. | 0.00% | Add +6.0% | 882,134 | $3.6M |
| Susquehanna International Group, LLP | 0.00% | Add +3768.2% | 856,222 | $3.5M |
| Stempoint Capital LP | 0.68% | Reduce -5.3% | 850,742 | $3.5M |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 480,733 | $2.0M |
| State Street Corp. | 0.00% | Add +103.6% | 403,534 | $1.7M |
| Marshall Wace, LLP | 0.00% | Add +318.7% | 336,834 | $1.4M |
| Stonepine Capital Management, LLC | 1.22% | Reduce -43.5% | 335,309 | $1.4M |
| Venrock Adviser, LLC | 0.05% | New | 330,525 | $1.4M |
| UBS Group AG | 0.00% | Add +6374.7% | 267,340 | $1.1M |
| Qube Research & Technologies Ltd | 0.00% | Add +223.2% | 218,954 | $904K |
| Northern Trust Corp. | 0.00% | No change | 178,235 | $736K |
| Pale Fire Capital SE | 0.06% | No change | 167,590 | $692K |
| Bank of America Corp. | 0.00% | Add +321.3% | 150,676 | $622K |
| Affinity Asset Advisors, LLC | 0.04% | No change | 145,000 | $599K |
| Palumbo Wealth Management LLC | 0.13% | Add +15.6% | 131,014 | $541K |
| Brevan Howard Capital Management LP | 0.01% | New | 127,321 | $526K |
| Susquehanna Portfolio Strategies, LLC | 0.01% | Add +137.2% | 102,599 | $424K |
| Dynamic Technology Lab Private Ltd | 0.06% | New | 36,221 | $385K |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -0.1% | 66,749 | $276K |
| OMERS ADMINISTRATION Corp | 0.00% | Reduce -47.5% | 57,300 | $237K |
| Hudson Bay Capital Management LP | 0.00% | Add +56.0% | 50,287 | $208K |
| Catalyst Funds Management Pty Ltd | 0.03% | New | 47,383 | $196K |
| Jane Street Group, LLC | 0.00% | Reduce -59.4% | 37,143 | $153K |
| Citigroup Inc. | 0.00% | Add +10.6% | 35,765 | $148K |
| Vanguard Global Advisers, LLC | 0.00% | — | 32,977 | $136K |
| Diametric Capital, LP | 0.03% | New | 28,973 | $120K |
| Stifel Financial Corp. | 0.00% | Add +6.3% | 21,789 | $90K |
| Invesco Ltd. | 0.00% | New | 19,968 | $82K |
| Schonfeld Strategic Advisors LLC | 0.00% | New | 19,514 | $81K |
| Jefferies Financial Group Inc. | 0.00% | Reduce -25.4% | 19,474 | $80K |
| Caxton Corp. | 1.60% | No change | 15,557 | $64K |
| ExodusPoint Capital Management, LP | 0.00% | Reduce -81.4% | 14,703 | $61K |
| Two Sigma Investments, LP | 0.00% | Reduce -19.6% | 13,868 | $57K |
| Creative Planning | 0.00% | Reduce -15.9% | 13,819 | $57K |
| Virtu Financial LLC | 0.00% | Reduce -43.4% | 12,730 | $53K |
| Jump Financial, LLC | 0.00% | New | 12,317 | $51K |
| Vanguard Personalized Indexing Management, LLC | 0.00% | New | 11,525 | $48K |
| SummitTX Capital, L.P. | 0.00% | New | 11,200 | $46K |
| WINTON GROUP Ltd | 0.00% | New | 10,600 | $44K |
| Indivisible Partners | 0.00% | No change | 10,000 | $37K |
| BNP Paribas Financial Markets | 0.00% | Add +830.7% | 4,756 | $20K |
| Barclays PLC | 0.00% | Reduce -95.1% | 2,814 | $12K |
| Signaturefd, LLC | 0.00% | Reduce -27.5% | 1,996 | $8K |
| PNC Financial Services Group, Inc. | 0.00% | No change | 1,759 | $7K |
| State of Wyoming | 0.00% | New | 1,065 | $4K |
| Russell Investments Group, Ltd. | 0.00% | No change | 729 | $3K |
| Acadian Asset Management LLC | 0.00% | New | 802 | $3K |
| Group One Trading LLC | 0.00% | Reduce -82.2% | 712 | $3K |
| Bleichroeder LP | 0.00% | No change | 595 | $2K |
| Farther Finance Advisors, LLC | 0.00% | No change | 331 | $1K |
| Allworth Financial LP | 0.00% | Reduce -56.6% | 310 | $1K |
| Blue Trust, Inc. | 0.00% | No change | 284 | $1K |
| Tower Research Capital LLC (TRC) | 0.00% | Reduce -98.3% | 180 | $743 |
| Quadrant Capital Group LLC | 0.00% | New | 128 | $529 |
| Parallel Advisors, LLC | 0.00% | New | 116 | $479 |
| SBI Securities Co., Ltd. | 0.00% | Add +8.0% | 54 | $223 |
| Jones Financial Companies LLLP | 0.00% | No change | 38 | $154 |
| Rockefeller Capital Management L.P. | 0.00% | No change | 33 | $136 |
| JPMorgan Chase & Co. | 0.00% | Reduce -99.3% | 33 | $132 |
| HighMark Wealth Management LLC | 0.00% | No change | 6 | $24 |
| Northwestern Mutual Wealth Management Co. | 0.00% | No change | 5 | $21 |
| Royal Bank of Canada | 0.00% | Add +10.6% | 115 | $0 |
"% of holder's portfolio" is XFOR's weight in each manager's 13F, not the share of X4 Pharmaceuticals Inc. the manager owns.