X4 Pharmaceuticals, Inc: which funds bought and sold
Institutions that bought and sold X4 Pharmaceuticals shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.
Between March 31, 2026 and June 30, 2026, 57 institutions that filed 13F reports for both quarters added to or opened positions in X4 Pharmaceuticals, and 39 cut or closed them. Together they added a net 7.1M shares, +7.5% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 1.4M shares (+4.8%); index fund managers were net buyers of 8.0M shares (+118.0%). 33 opened a new position and 26 sold out entirely.
Bought, Q2 2026 57 institutions, 33 of them new holders Sold, Q2 2026 39 institutions, 26 of them sold out
Net change, all compared +7.1M shares (+7.5%)
Net change, active managers +1.4M shares (+4.8%), 13 bought, 10 sold
Buyers versus sellers
57 bought 18 39 sold
Active managers and hedge funds 13 bought · 10 sold · +1.4M
Index fund managers 10 bought · 1 sold · +8.0M
Other institutions 34 bought · 28 sold · −2.4M
Biggest buyers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Blackrock, Inc. Index funds | +4.3M +358.4% | 5.6M | $25.9M |
| Nantahala Capital Management, LLC Hedge fund | +2.4M +100.0% | 4.9M | $22.9M |
| Venrock Adviser, LLC | +1.6M +485.2% | 1.9M | $9M |
| Perceptive Advisors LLC Hedge fund | +1.2M +17.7% | 7.9M | $37M |
| Geode Capital Management, LLC Index funds | +1.2M +123.3% | 2.1M | $9.8M |
| State Street Corp Index funds | +892K +221.2% | 1.3M | $6.1M |
| Vanguard Portfolio Management LLC Index funds | +542K New position | 542K | $2.5M |
| Saturn V Capital Management LP | +517K +8.0% | 7.0M | $32.6M |
| Northern Trust Corp Index funds | +475K +266.3% | 653K | $3M |
| Verdad Advisers, LP | +352K New position | 352K | $1.6M |
| FMR LLC Active manager | +218K +2.7% | 8.3M | $38.9M |
| Vanguard Capital Management LLC Index funds | +218K +6.2% | 3.7M | $17.4M |
| Charles Schwab Investment Management Inc Index funds | +197K +294.4% | 263K | $1.2M |
| Bank Of New York Mellon Corp | +196K New position | 196K | $916,908 |
| Nuveen, LLC | +107K New position | 107K | $501,507 |
| Alps Advisors Inc | +96K New position | 96K | $447,040 |
| Rhumbline Advisers Index funds | +95K New position | 95K | $444,022 |
| Vanguard Fiduciary Trust Co Index funds | +91K +19.0% | 572K | $2.7M |
| Deutsche Bank Ag\ | +79K New position | 79K | $368,393 |
| Invesco Ltd. | +77K +384.6% | 97K | $451,926 |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Nantahala Capital Management, LLC Hedge fund | +2.4M +100.0% | 4.9M | $22.9M |
| Perceptive Advisors LLC Hedge fund | +1.2M +17.7% | 7.9M | $37M |
| FMR LLC Active manager | +218K +2.7% | 8.3M | $38.9M |
| American Century Companies Inc Active manager | +75K New position | 75K | $349,293 |
| Squarepoint Ops LLC Hedge fund | +67K New position | 67K | $313,254 |
| Price T Rowe Associates Inc Active manager | +66K New position | 66K | $310,000 |
| Wellington Management Group LLP Active manager | +52K New position | 52K | $241,906 |
| Point72 Asset Management, L.P. Hedge fund | +41K New position | 41K | $191,806 |
| Renaissance Technologies LLC Hedge fund | +18K New position | 18K | $84,527 |
| Intech Investment Management LLC Active manager | +17K New position | 17K | $80,744 |
Biggest sellers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Empery Asset Management, LP | −2.0M −22.5% | 6.9M | $32.4M |
| Stempoint Capital LP | −1.7M Sold out | 0 | — |
| Millennium Management LLC Hedge fund | −1.2M Sold out | 0 | — |
| Susquehanna International Group, LLP | −842K −98.4% | 14K | $65,614 |
| Deep Track Capital, LP Hedge fund | −461K −7.3% | 5.9M | $27.5M |
| Samsara Biocapital, LLC | −437K −23.8% | 1.4M | $6.5M |
| Braidwell LP Hedge fund | −350K −10.7% | 2.9M | $13.6M |
| Marshall Wace, LLP Hedge fund | −337K Sold out | 0 | — |
| Qube Research & Technologies Ltd Hedge fund | −219K Sold out | 0 | — |
| UBS Group AG | −209K −78.3% | 58K | $271,060 |
| Pale Fire Capital Se | −168K Sold out | 0 | — |
| Brevan Howard Capital Management LP Hedge fund | −127K Sold out | 0 | — |
| Stonepine Capital Management, LLC | −110K −32.9% | 225K | $1.1M |
| Bank Of America Corp | −104K −68.9% | 47K | $218,841 |
| Palumbo Wealth Management LLC | −64K −48.8% | 67K | $313,432 |
| Omers Administration Corp | −57K Sold out | 0 | — |
| Hudson Bay Capital Management LP Hedge fund | −50K Sold out | 0 | — |
| Catalyst Funds Management Pty Ltd | −47K Sold out | 0 | — |
| Jane Street Group, LLC | −37K Sold out | 0 | — |
| Dynamic Technology Lab Private Ltd | −36K Sold out | 0 | — |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Millennium Management LLC Hedge fund | −1.2M Sold out | 0 | — |
| Deep Track Capital, LP Hedge fund | −461K −7.3% | 5.9M | $27.5M |
| Braidwell LP Hedge fund | −350K −10.7% | 2.9M | $13.6M |
| Marshall Wace, LLP Hedge fund | −337K Sold out | 0 | — |
| Qube Research & Technologies Ltd Hedge fund | −219K Sold out | 0 | — |
| Brevan Howard Capital Management LP Hedge fund | −127K Sold out | 0 | — |
| Hudson Bay Capital Management LP Hedge fund | −50K Sold out | 0 | — |
| Schonfeld Strategic Advisors LLC Hedge fund | −20K Sold out | 0 | — |
| Exoduspoint Capital Management, LP Hedge fund | −15K Sold out | 0 | — |
| Acadian Asset Management LLC Active manager | −802 Sold out | 0 | — |
New positions
| Institution | Shares | Value June 30, 2026 |
|---|---|---|
| Vanguard Portfolio Management LLCIndex funds | 542K | $2.5M |
| Verdad Advisers, LP | 352K | $1.6M |
| Bank Of New York Mellon Corp | 196K | $916,908 |
| Nuveen, LLC | 107K | $501,507 |
| Alps Advisors Inc | 96K | $447,040 |
| Rhumbline AdvisersIndex funds | 95K | $444,022 |
| Deutsche Bank Ag\ | 79K | $368,393 |
| Gsa Capital Partners LLP | 76K | $356,000 |
| American Century Companies IncActive manager | 75K | $349,293 |
| Wells Fargo & Company | 68K | $316,215 |
Sold out
| Institution | Shares | Value March 31, 2026 |
|---|---|---|
| Stempoint Capital LP | 1.7M | $7M |
| Millennium Management LLCHedge fund | 1.2M | $5M |
| Marshall Wace, LLPHedge fund | 337K | $1.4M |
| Qube Research & Technologies LtdHedge fund | 219K | $904,280 |
| Pale Fire Capital Se | 168K | $692,147 |
| Brevan Howard Capital Management LPHedge fund | 127K | $525,836 |
| Dynamic Technology Lab Private Ltd | 36K | $384,667 |
| Omers Administration Corp | 57K | $236,649 |
| Hudson Bay Capital Management LPHedge fund | 50K | $207,685 |
| Catalyst Funds Management Pty Ltd | 47K | $195,692 |
Who holds the shares
- Institutions reporting
- 88
- Ten largest holders
- 69.9% of 13F-reported shares
- Index fund managers
- 14.5% of 13F-reported shares
- Active managers and hedge funds
- 30.7% of 13F-reported shares
| Type | Bought | Sold | New | Sold out | Net change in shares | Net % |
|---|---|---|---|---|---|---|
| Active managers and hedge funds | 13 | 10 | 8 | 8 | +1.4M | +4.8% |
| Index fund managers | 10 | 1 | 3 | 1 | +8.0M | +118.0% |
| Other institutions | 34 | 28 | 22 | 17 | −2.4M | −4.0% |