X4 Pharmaceuticals, Inc.
A Boston-based biopharmaceutical company that makes medicines for rare immune-system diseases. Its drug XOLREMDI (mavorixafor), an oral pill approved by the FDA, treats WHIM syndrome, an ultra-rare inherited disorder that traps infection-fighting white blood cells in the bone marrow. Founded around 2015, the company took its name from the CXCR4 receptor its drug targets, and it built its lead medicine from a molecule originally developed by Sanofi.
Granted 3.48M · Sold 690.5K
Granted 1.17M · Sold 182.0K
Granted 875.8K · Sold 11.6K
Granted 1.39M · Sold 616.3K
Granted 461.3K · Sold 159.6K
Granted 289.9K · Bought 86.2K
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Granted 193.3K · Sold 17.0K
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Granted 745.7K · Bought 35.0K · Sold 50.5K
Granted 46.5K
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Granted 136.5K
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| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Ragan PaulaPresident and CEO, Director · 12 transactions | +513.7% | 3.34Mas of Feb 2025 | 3.48M | — | 690.5K |
| DiBiase MaryChief Operating Officer · 11 transactions | +657.9% | 1.14Mas of Feb 2025 | 1.17M | — | 182.0K |
| Arbet-Engels ChristopheChief Medical Officer · 3 transactions | — | 864.2Kas of Feb 2025 | 875.8K | — | 11.6K |
| Mostafa Adam S.Chief Financial Officer · 9 transactions | +959.6% | 850.0Kas of Feb 2025 | 1.39M | — | 616.3K |
| Taveras ArthurChief Scientific Officer · 6 transactions | +349.2% | 388.0Kas of Oct 2024 | 461.3K | — | 159.6K |
| Craig Adam RExecutive Chairman, Director · 2 transactions | — | 376.1K | 289.9K | 86.2K | — |
| Volpone JohnPresident · 1 transaction | — | 289.9Kas of Aug 2025 | 289.9K | — | — |
| Kirske DavidChief Financial Officer · 2 transactions | — | 176.3K | 193.3K | — | 17.0K |
| Aliski WilliamDirector · 1 transaction | +87.1% | 96.7Kas of Jun 2024 | 45.0K | — | — |
| Lawton Alison FrancesDirector · 1 transaction | +87.1% | 96.7Kas of Jun 2024 | 45.0K | — | — |
| Baldry MarkChief Commercial Officer · 10 transactions | — | 25.3Kas of May 2025 | 745.7K | 35.0K | 50.5K |
| Stewart MurrayDirector · 2 transactions | -94.6% | 7.9Kas of Jun 2025 | 46.5K | — | — |
| Thoren Natasha FayChief Legal Officer · 1 transaction | — | 7.0Kas of Jun 2025 | 3.3K | — | — |
| Woods KeithDirector · 3 transactions | — | 6.0Kas of Jun 2025 | 136.5K | — | — |
| Wyzga Michael SDirector · 2 transactions | -92.8% | 5.6Kas of Jun 2025 | 46.5K | — | — |
| Bridger GaryDirector · 2 transactions | -90.9% | 4.7Kas of Jun 2025 | 46.5K | — | — |
| McGirr David W JDirector · 2 transactions | -90.9% | 4.7Kas of Jun 2025 | 46.5K | — | — |
| de Craecker FrancoiseDirector · 2 transactions | -90.9% | 4.7Kas of Jun 2025 | 46.5K | — | — |
Select a row to see that insider’s individual transactions.
Net open-market activity over the last 3 years: -1.61M shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.