Who owns X4 Pharmaceuticals, Inc.?
Institutional ownership of XFOR from SEC Form 13F filings across 59 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
59
13F holders
$203.2M
value, 2026 filers
46.2%
of shares outstanding (43.6M sh)
24
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30· % of fund = share of the manager's own book · % of co. = share of XFOR's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | MORGAN STANLEY | 9.5M | $44.2M | 0.0% | 10% | -0.1% |
| 2 | FMR LLC | 8.3M | $38.9M | 0.0% | 8.8% | +2.7% |
| 3 | Deep Track Capital, LP | 5.9M | $27.5M | 0.4% | 6.2% | -7.3% |
| 4 | BlackRock, Inc. | 5.6M | $25.9M | 0.0% | 5.9% | +358.4% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 3.7M | $17.4M | 0.0% | 3.9% | -46.9% |
| 6 | Blackstone Inc. | 2.7M | $12.5M | 0.0% | 2.8% | 0.0% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 2.1M | $9.8M | 0.0% | 2.2% | +123.3% |
| 8 | Woodline Partners LP | 1.0M | $4.7M | 0.0% | 1.1% | -50.0% |
| 9 | GOLDMAN SACHS GROUP INC | 916,536 | $4.3M | 0.0% | 1% | +3.9% |
| 10 | NORTHERN TRUST CORP | 652,849 | $3.0M | 0.0% | 0.7% | +266.3% |
| 11 | VANGUARD FIDUCIARY TRUST CO | 572,038 | $2.7M | 0.0% | 0.6% | +19.0% |
| 12 | VANGUARD PORTFOLIO MANAGEMENT LLCNEW | 542,128 | $2.5M | 0.0% | 0.6% | new |
| 13 | Sixth Street Partners Management Company, L.P.NEW | 263,264 | $1.2M | 0.2% | 0.3% | new |
| 14 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 263,264 | $1.2M | 0.0% | 0.3% | +294.4% |
| 15 | Bank of New York Mellon CorpNEW | 196,340 | $916,908 | 0.0% | 0.2% | new |
| 16 | Nuveen, LLCNEW | 107,389 | $501,507 | 0.0% | 0.1% | new |
| 17 | Invesco Ltd. | 96,772 | $451,926 | 0.0% | 0.1% | +384.6% |
| 18 | ALPS ADVISORS INCNEW | 95,726 | $447,040 | 0.0% | 0.1% | new |
| 19 | RHUMBLINE ADVISERSNEW | 95,081 | $444,022 | 0.0% | 0.1% | new |
| 20 | DEUTSCHE BANK AG\NEW | 78,885 | $368,393 | 0.0% | 0.1% | new |
| 21 | AMERICAN CENTURY COMPANIES INCNEW | 74,795 | $349,293 | 0.0% | 0.1% | new |
| 22 | CITIGROUP INC | 70,112 | $327,423 | 0.0% | 0.1% | +96.0% |
| 23 | WELLS FARGO & COMPANY/MNNEW | 67,712 | $316,215 | 0.0% | 0.1% | new |
| 24 | Squarepoint Ops LLCNEW | 67,078 | $313,254 | 0.0% | 0.1% | new |
| 25 | PRICE T ROWE ASSOCIATES INC /MD/NEW | 66,379 | $310 | 0.0% | 0.1% | new |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.