Third Harmonic Bio
IPOThird Harmonic Bio is a life sciences company in Boston, United States, founded in 2019. It has raised $155.0M across 3 rounds, most recently a $105.0M Series B in December 2021.
- Headquarters
- Boston
- Employees
- 11–50
- Founded
- 2019
- Website
- thirdharmonicbio.com
- Total Funding
- $155.0M
- Last Round
- $105.0M Series BDec 2021
- Rounds
- 3
- Type
- Public
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
Indexed holds 3 funding rounds and 3 investors for this company. The full record is or through the API.
About
Third Harmonic Bio is a clinical-stage biopharmaceutical company based in Boston, Massachusetts, founded in 2019 by Atlas Venture. It is developing a first-in-class, highly selective oral KIT inhibitor licensed from Novartis for chronic urticaria, asthma, and other mast cell-driven allergic and inflammatory diseases. The company emerged from stealth in February 2022 with a $155 million Series B financing backed by General Atlantic and Atlas Venture. In April 2025 it announced a wind-down of operations after discontinuing its lead clinical program.
Summary
It lists 11–50 employees. It has raised $155.0M in total across 3 rounds, most recently a $105.0M Series B round in Dec 2021. Investors include Atlas Venture, OrbiMed and BVF Partners.
Funding & Exit History
Sep 2022
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Funding: Seed through Series B. Amounts, valuations, and investors where available.
Investors
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