X4 Pharmaceuticals
IPOWith Rare Resolve.
Public · Boston, United States · Founded 2014 · $446.8M raised
- Headquarters
- Boston, Massachusetts
- Employees
- 51–200
- Founded
- 2014
- Business Model
- B2B
- Website
- x4pharma.com
- Total Funding
- $446.8M
- Last Round
- $155.3M Series COct 2025
- Rounds
- 7
- Type
- Public
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
About
X4 Pharmaceuticals is a clinical-stage biopharmaceutical company developing and commercializing innovative therapies for rare diseases of the immune system. Its lead asset, mavorixafor (XOLREMDI®), has received U.S. FDA approval for its first indication in WHIM syndrome, with ongoing Phase 3 trials in chronic neutropenic disorders. X4 is headquartered in Boston and trades on Nasdaq under XFOR.
Summary
X4 Pharmaceuticals is a Biotech company based in Boston, United States, founded in 2014. It has raised $446.8M in total across 7 rounds, most recently a $155.3M Series C round in Oct 2025. Investors include Coastlands Capital, New Enterprise Associates and Bain Capital Life Sciences.
Tech & App Stack
5 technologies & apps tracked
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Funding & Exit History
Oct 2025
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Funding: Seed through Series C. Amounts, valuations, and investors where available.
Investors
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