Co-investors · Private equity · United States

Who invests with EcoR1 Capital

31 investors have backed two or more of the 24 startups EcoR1 Capital has backed in rounds we track. Grouped by kind, each ranked by how many of these startups it shares; Fidelity shares the most, 10.

31co-investors
3kinds
Fidelitymost shared (10)
VC firmsmost common kind

EcoR1 Capital's whole portfolioEcoR1 Capital's profile

VC firms

20

Private equity and asset managers

8

Growth funds

3

Segment by segment

VC firms

20 investors

  1. FidelityVC firmUnited States10 backed
  2. Alexandria Real Estate EquitiesVC firmUnited States8 backed
  3. Redmile GroupVC firmUnited States6 backed
  4. Omega FundsVC firmUnited States6 backed
  5. Samsara BioCapitalVC firmUnited States5 backed
  6. Casdin CapitalVC firmUnited States4 backed
  7. ARCH Venture PartnersVC firmUnited States4 backed
  8. The Column GroupVC firmUnited States3 backed

Private equity and asset managers

8 investors

  1. OrbiMedPrivate equityUnited States7 backed
  2. InvusPrivate equityUnited States5 backed
  3. Foresite CapitalPrivate equityUnited States4 backed
  4. ArchHedge fund-3 backed
  5. ArrowMark PartnersPrivate equityUnited States2 backed
  6. Vivo CapitalPrivate equityUnited States2 backed
  7. RA Capital ManagementPrivate equityUnited States2 backed
  8. Cormorant Asset ManagementPrivate equityUnited States2 backed

Growth funds

3 investors

  1. Fidelity Management and Research CompanyGrowth fundUnited States3 backed
  2. JCJanus Capital GroupGrowth fundUnited States2 backed
  3. Goldbell GroupGrowth fundSingapore2 backed

How this map is made. Every investor here has backed two or more of the same startups as EcoR1 Capital, in rounds we track. Grouped by kind, each ranked by how many startups it shares with EcoR1 Capital. Rebuilt nightly; updated 15 November 2026.

More portfolio maps

All portfolios
Sector portfolioEcoR1 Capital's Biotech portfolio16 startups · $3.7BCo-investorsWho invests with Gaingels610 co-investorsCo-investorsWho invests with Goldman Sachs398 co-investorsCo-investorsWho invests with General Atlantic207 co-investorsCo-investorsWho invests with Pioneer Fund197 co-investorsCo-investorsWho invests with T. Rowe Price174 co-investors

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