# X4 PHARMACEUTICALS INC COM NEW

X4 PHARMACEUTICALS INC COM NEW is a security (CUSIP 98420X202) tracked across SEC portfolio filings. 86 institutional managers reported $372.6M on Form 13F as of 2026-06-30; 4 registered fund positions totaling $4.2M via N-PORT as of 2026-03-31.

## Summary

- Issuer: X4 PHARMACEUTICALS INC
- Class: COM NEW
- CUSIP: 98420X202
- Asset category: EC
- 13F holders: 86
- 13F value: $372.6M
- 13F period: 2026-06-30
- N-PORT fund positions: 4
- N-PORT value: $4.2M
- N-PORT report: 2026-03-31

## Top institutional holders (Form 13F)

_Showing 15 of 86 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| MORGAN STANLEY | NEW YORK, NY | $39.1M | 9,466,992 |
| [Empery Asset Management, LP](https://search.stillhousedata.com/firm/148180) | New York, NY | $36.9M | 8,944,118 |
| FMR LLC | BOSTON, MA | $33.5M | 8,103,400 |
| Bain Capital Life Sciences Investors, LLC | Boston, MA | $32.9M | 7,967,454 |
| [PERCEPTIVE ADVISORS LLC](https://search.stillhousedata.com/firm/154703) | NEW YORK, NY | $27.8M | 6,737,648 |
| [Saturn V Capital Management LP](https://search.stillhousedata.com/firm/316649) | AUSTIN, TX | $26.7M | 6,456,646 |
| Deep Track Capital, LP | GREENWICH, CT | $26.2M | 6,339,535 |
| [Kalehua Capital Management LLC](https://search.stillhousedata.com/firm/325290) | DALLAS, TX | $15.4M | 3,722,840 |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $13.7M | 3,423,662 |
| [BRAIDWELL LP](https://search.stillhousedata.com/firm/316988) | STAMFORD, CT | $13.5M | 3,272,954 |
| Rosalind Advisors, Inc. | TORONTO, A6 | $13.3M | 3,214,766 |
| Blackstone Inc. | NEW YORK, NY | $11.1M | 2,681,922 |
| Trails Edge Capital Partners, LP | ATLANTA, GA | $10.6M | 2,571,478 |
| Nantahala Capital Management, LLC | New Canaan, CT | $10.1M | 2,449,468 |
| BVF INC/IL | San Francisco, CA | $9.2M | 2,233,742 |

## Top fund holders (N-PORT)

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $3.8M | 0.47% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $201K | 0.03% |
| [VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002855) | VANGUARD INSTITUTIONAL INDEX FUNDS | $175K | 0.06% |
| [Blackstone Alternative Multi-Strategy Fund](https://search.stillhousedata.com/fund/S000045538) | Blackstone Alternative Investment Funds | $-6K | -0.02% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/98420X202.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.