RA Capital

VC firm · Boston, MA

Verified active in the last 12 monthsSEC-registered adviser

Venture firm based in Boston, MA. Most recent fund on file: RA Capital Planetary Health Fund, L.P. ($122M offering), filed Jul 2025. Partners sit on the boards of 6 startups that raised recently.

“RA Capital is an evidence-based, multi-stage healthcare and planetary health investor and company builder inventing a healthier future.” (from the firm’s website)

Stages: Seed to Growth
Typical check (est.): $1.23M–$3.65M
Latest fund: $122M · Jul 2025
Last verified activity: Jan 2026

Focus

HealthcareBiotech & Pharma

Recent portfolio activity

Avalanche Energy Designs
Board seat · WA
Jan 2026
Apeiron Labs
Board seat · MA
Aug 2025
ESS Tech
Board seat · OR
Sep 2023
Nature's Toolbox
Board seat · NM
Sep 2023
Terrestrial Bio
Board seat · MA
Jul 2023
Sortera Technologies
Board seat · IN
May 2023

Funds and vehicles on SEC file

RA Capital Planetary Health Fund, L.P.
Fund · $122M offering
Jul 2025
RA Capital Planetary Health International Fund, L.P.
Fund · $30.3M offering
Jul 2025
RA Capital Nexus International Fund IV, L.P.
Fund
Apr 2025
RA Capital Nexus Fund IV, L.P.
Fund
Apr 2025

Sources

SEC Form D: RA Capital Planetary Health Fund, L.P.Jul 22, 2025
SEC Form D: RA Capital Planetary Health International Fund, L.P.Jul 22, 2025
SEC Form D: RA Capital Nexus International Fund IV, L.P.Apr 23, 2025
SEC Form D: RA Capital Nexus Fund IV, L.P.Apr 23, 2025
SEC adviser record: Ra Capital Management, LPMar 31, 2026
Firm websiteOct 12, 2026

Profile last verified Oct 12, 2026. Is this you? Correct or remove this profile.