RA Capital Management

RA Capital Management is a premier, multi-stage investment firm exclusively focused on the healthcare and life sciences sectors, including therapeutics, medical devices, diagnostics, and research tools. They are a "company builder" that invests across the entire lifecycle, from seed-stage startups and company formation to leading Series A/B rounds, IPOs, and follow-on private investments in public companies. While their check sizes are highly flexible—ranging from under $1M for seed rounds to $75M+ for later-stage deals—they prioritize "evidence-based" investing supported by their internal TechAtlas research division, which maps competitive landscapes to identify high-impact breakthroughs. A founder is a good fit if they are developing a novel platform or a strategy based on validated targets with a clear path to clinical proof-of-concept, as RA Capital specifically seeks to partner with teams where they can add value through technology transfer, incubation, and strategic hiring.