# Who Invests With Third Rock Ventures: 33 Co-Investors (2026) > The 33 investors that have backed two or more of the same startups as Third Rock Ventures, by kind: vc firms, private equity and asset managers and... Source: https://millionrounds.com/portfolio-maps/third-rock-ventures-co-investors (Millionrounds; every figure on the page links to its filing or article) ## VC firms 15 - [Casdin Capital](https://millionrounds.com/fund/casdin-capital) - [Deerfield](https://millionrounds.com/fund/deerfield) - [Fidelity](https://millionrounds.com/fund/fidelity) - [Wellington Management](https://millionrounds.com/fund/wellington-management) - [The Column Group](https://millionrounds.com/fund/the-column-group) - [Bessemer Venture Partners](https://millionrounds.com/fund/bessemer-venture-partners) - [Polaris Partners](https://millionrounds.com/fund/polaris-partners) - [*FP* Flagship Pioneering, LLC](https://millionrounds.com/fund/flagship-pioneering-llc) - [Section 32](https://millionrounds.com/fund/section-32) - [New Enterprise Associates](https://millionrounds.com/fund/new-enterprise-associates) - [Cormorant Capital](https://millionrounds.com/fund/cormorant-capital) - [Khosla Ventures](https://millionrounds.com/fund/khosla-ventures) - [Alexandria Real Estate Equities](https://millionrounds.com/fund/alexandria) - [Schroder Adveq](https://millionrounds.com/fund/schroder-adveq) - [Sanofi](https://millionrounds.com/fund/sanofi) ## Private equity and asset managers 11 - [RA Capital Management](https://millionrounds.com/fund/ra-capital-management) - [OrbiMed](https://millionrounds.com/fund/orbimed) - [Janus Henderson Investors](https://millionrounds.com/fund/janus-henderson-investors) - [Foresite Capital](https://millionrounds.com/fund/forsite-capital) - [Nextech Invest](https://millionrounds.com/fund/nextech-invest) - [Frazier Healthcare Partners](https://millionrounds.com/fund/frazier-healthcare-partners) - [Perceptive Advisors](https://millionrounds.com/fund/perceptive-advisors) - [Cormorant Asset Management](https://millionrounds.com/fund/cormorant-asset-management) - [EcoR1 Capital](https://millionrounds.com/fund/ecor1-capital) - [MPM Capital](https://millionrounds.com/fund/mpm-bioimpact) - [*SC* Sabby Capital](https://millionrounds.com/fund/sabby-capital) ## Corporate investors 7 - [Google Ventures](https://millionrounds.com/fund/gv) - [Pfizer](https://millionrounds.com/fund/pfizer) - [Ipsen](https://millionrounds.com/fund/ipsen) - [SR One](https://millionrounds.com/fund/sr-one) - [*PH* Partners HealthCare Innovation](https://millionrounds.com/fund/partners-healthcare-innovation) - [Pharmstandard](https://millionrounds.com/fund/pharmstandard) - [Access Industries](https://millionrounds.com/fund/access-industries) ## Segment by segment ### VC firms 15 investors - [**Casdin Capital**](https://millionrounds.com/fund/casdin-capital) VC firm United States 14 backed - [**Deerfield**](https://millionrounds.com/fund/deerfield) VC firm United States 7 backed - [**Fidelity**](https://millionrounds.com/fund/fidelity) VC firm United States 7 backed - [**Wellington Management**](https://millionrounds.com/fund/wellington-management) VC firm United States 6 backed - [**The Column Group**](https://millionrounds.com/fund/the-column-group) VC firm United States 4 backed - [**Bessemer Venture Partners**](https://millionrounds.com/fund/bessemer-venture-partners) VC firm United States 4 backed - [**Polaris Partners**](https://millionrounds.com/fund/polaris-partners) VC firm United States 3 backed - [*FP* **Flagship Pioneering, LLC**](https://millionrounds.com/fund/flagship-pioneering-llc) VC firm United States 3 backed ### Private equity and asset managers 11 investors - [**RA Capital Management**](https://millionrounds.com/fund/ra-capital-management) Private equity United States 6 backed - [**OrbiMed**](https://millionrounds.com/fund/orbimed) Private equity United States 5 backed - [**Janus Henderson Investors**](https://millionrounds.com/fund/janus-henderson-investors) Private equity United Kingdom 4 backed - [**Foresite Capital**](https://millionrounds.com/fund/forsite-capital) Private equity United States 4 backed - [**Nextech Invest**](https://millionrounds.com/fund/nextech-invest) Private equity Switzerland 3 backed - [**Frazier Healthcare Partners**](https://millionrounds.com/fund/frazier-healthcare-partners) Private equity United States 3 backed - [**Perceptive Advisors**](https://millionrounds.com/fund/perceptive-advisors) Asset manager United States 3 backed - [**Cormorant Asset Management**](https://millionrounds.com/fund/cormorant-asset-management) Private equity United States 2 backed ### Corporate investors 7 investors - [**Google Ventures**](https://millionrounds.com/fund/gv) Corporate investor United States 3 backed - [**Pfizer**](https://millionrounds.com/fund/pfizer) Corporate investor United States 2 backed - [**Ipsen**](https://millionrounds.com/fund/ipsen) Corporate investor France 2 backed - [**SR One**](https://millionrounds.com/fund/sr-one) Corporate investor United States 2 backed - [*PH* **Partners HealthCare Innovation**](https://millionrounds.com/fund/partners-healthcare-innovation) Corporate investor United States 2 backed - [**Pharmstandard**](https://millionrounds.com/fund/pharmstandard) Corporate investor - 2 backed - [**Access Industries**](https://millionrounds.com/fund/access-industries) Corporate investor United States 2 backed **How this map is made.** Every investor here has backed two or more of the same startups as Third Rock Ventures, in rounds we track. Grouped by kind, each ranked by how many startups it shares with Third Rock Ventures. Rebuilt nightly; updated 15 November 2026. ## More portfolio maps [All portfolios](https://millionrounds.com/portfolio-maps) [Sector portfolio **Third Rock Ventures' Biotech portfolio** 30 startups ยท $6.7B](https://millionrounds.com/portfolio-maps/third-rock-ventures-biotech-portfolio)[Co-investors **Who invests with Techstars** 991 co-investors](https://millionrounds.com/portfolio-maps/techstars-co-investors)[Co-investors **Who invests with SV Angel** 988 co-investors](https://millionrounds.com/portfolio-maps/sv-angel-co-investors)[Co-investors **Who invests with Andreessen Horowitz** 977 co-investors](https://millionrounds.com/portfolio-maps/andreessen-horowitz-co-investors)[Co-investors **Who invests with Alumni Ventures** 911 co-investors](https://millionrounds.com/portfolio-maps/us-strategic-tech-fund-an-alumni-ventures-fund-co-investors)[Co-investors **Who invests with Sequoia Capital** 827 co-investors](https://millionrounds.com/portfolio-maps/sequoia-capital-co-investors) ## Raising from investors like Third Rock Ventures? 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