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
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, Bain Capital Life Sciences and New Enterprise Associates.
Tech & App Stack
5 technologies & apps tracked
Every product and vendor across these categories, with where each signal came from.
Create a free account with 25 free credits every month, no card needed, to unlock the full tech & app stack, funding history, and valuations.
Funding History
Sign up to view the funding chart
Create a free account with 25 free credits every month, no card needed, to unlock funding history, valuations, and tech stacks.
Oct 2025
Sign up to see all 8 rounds
Seed through Series C — per-round amounts, valuations, and who invested in each round.
Investors
Similar Companies
China's leading mRNA biotech company developing therapeutics for cancer and infectious diseases.
San Diego-based clinical stage biopharmaceutical company focused on the development of small mole...
Clinical-stage biopharmaceutical developing precision medicines targeting novel mechanisms to tre...
Asymchem provides R&D and one-stop production services to the world's top pharmaceutical companies.
Developer of engineered cells as medicines to treat diseases by repairing or replacing cells for ...
Late-stage biopharma using single-molecule tracking, AI, and engineering to discover and develop ...
Your company? Embed this profile
Add the live badge to your site — it stays current as your funding data updates.
<a href="https://indexed.vc/companies/x4-pharmaceuticals"><img src="https://indexed.vc/api/badge/company/x4-pharmaceuticals" alt="X4 Pharmaceuticals on Indexed.vc" width="260" height="76" /></a>