# Who Invests With Flagship Pioneering: 15 Co-Investors (2026)

> The 15 investors that have backed two or more of the same startups as Flagship Pioneering, by kind: vc firms and private equity and asset managers.

Source: https://millionrounds.com/portfolio-maps/flagship-pioneering-co-investors (Millionrounds; every figure on the page links to its filing or article)

## VC firms

9

- [Fidelity](https://millionrounds.com/fund/fidelity)
- [Alexandria Real Estate Equities](https://millionrounds.com/fund/alexandria)
- [*AV* Alexandria Venture Investments](https://millionrounds.com/fund/alexandria-venture-investments)
- [Casdin Capital](https://millionrounds.com/fund/casdin-capital)
- [Mayo Clinic](https://millionrounds.com/fund/mayo-clinic)
- [Partners Investment](https://millionrounds.com/fund/partners-investment)
- [Polaris Partners](https://millionrounds.com/fund/polaris-partners)
- [ARCH Venture Partners](https://millionrounds.com/fund/arch-venture-partners)
- [*FP* Flagship Pioneering, LLC](https://millionrounds.com/fund/flagship-pioneering-llc)

## Private equity and asset managers

6

- [Invus](https://millionrounds.com/fund/invus)
- [Alaska Permanent Fund Corporation](https://millionrounds.com/fund/alaska-permanent-fund-corporation)
- [Baillie Gifford](https://millionrounds.com/fund/baillie-gifford)
- [Arch](https://millionrounds.com/fund/arch)
- [BlackRock](https://millionrounds.com/fund/blackrock)
- [Gates Foundation](https://millionrounds.com/fund/bill-and-melinda-gates-foundation)

## Segment by segment

### VC firms

9 investors

- [**Fidelity**](https://millionrounds.com/fund/fidelity) VC firm United States 7 backed
- [**Alexandria Real Estate Equities**](https://millionrounds.com/fund/alexandria) VC firm United States 6 backed
- [*AV* **Alexandria Venture Investments**](https://millionrounds.com/fund/alexandria-venture-investments) VC firm - 6 backed
- [**Casdin Capital**](https://millionrounds.com/fund/casdin-capital) VC firm United States 3 backed
- [**Mayo Clinic**](https://millionrounds.com/fund/mayo-clinic) Investment firm United States 3 backed
- [**Partners Investment**](https://millionrounds.com/fund/partners-investment) VC firm South Korea 3 backed
- [**Polaris Partners**](https://millionrounds.com/fund/polaris-partners) VC firm United States 3 backed
- [**ARCH Venture Partners**](https://millionrounds.com/fund/arch-venture-partners) VC firm United States 3 backed

### Private equity and asset managers

6 investors

- [**Invus**](https://millionrounds.com/fund/invus) Private equity United States 6 backed
- [**Alaska Permanent Fund Corporation**](https://millionrounds.com/fund/alaska-permanent-fund-corporation) Investor United States 4 backed
- [**Baillie Gifford**](https://millionrounds.com/fund/baillie-gifford) Asset manager United Kingdom 4 backed
- [**Arch**](https://millionrounds.com/fund/arch) Hedge fund - 3 backed
- [**BlackRock**](https://millionrounds.com/fund/blackrock) Asset manager United States 3 backed
- [**Gates Foundation**](https://millionrounds.com/fund/bill-and-melinda-gates-foundation) Investor United States 2 backed

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

## More portfolio maps

[All portfolios](https://millionrounds.com/portfolio-maps)

[Portfolio map **Flagship Pioneering portfolio map** 39 startups · $4.5B](https://millionrounds.com/portfolio-maps/flagship-pioneering-portfolio-map)[Sector portfolio **Flagship Pioneering's Biotech portfolio** 25 startups · $3.1B](https://millionrounds.com/portfolio-maps/flagship-pioneering-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)

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