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EcoR1 Capital portfolio

EcoR1 Capital has 4 portfolio companies on record at Recent Funding. It led 1 of the 4 rounds it joined. Its most recent investment on record is Actio Biosciences's $55M Series A round in September 2023, alongside Euclidean Capital, Droia Ventures, Deerfield and 1 other. By category, its portfolio leans toward Health and bio (4) and Manufacturing and industrial (1). It has co-invested with Canaan Partners, Deerfield and Euclidean Capital.

What EcoR1 Capital invests in

• Health and bio · 4 · 100%
• Manufacturing and industrial · 1 · 25%

EcoR1 Capital recent investments

Company	Round	Date	Alongside
AActio Biosciences	Series A · $55M	Sep 1, 2023	Euclidean Capital, Droia Ventures (lead), Deerfield +1
AAktis Oncology	Series A · $72M · lead	Mar 18, 2021	Vida Ventures (lead), TCG Crossover, Octagon Capital Advisors +3
CCellares	Series A · $18M	Oct 1, 2020	Eclipse (lead), 8VC
AAtreca	Series B+ · $125M	Sep 12, 2018	Wellington Management (lead), Tekla Capital Management, Tavistock Life Sciences +5

How EcoR1 Capital invests

Share is of the 4 rounds on Recent Funding that name EcoR1 Capital. Rounds with no announced date are left out of the year split, and "round" is a round whose stage is not on file.

EcoR1 Capital portfolio companies

• AActio Biosciences$55MSeries A · Sep 2023
• AAktis Oncology$72MSeries A · Mar 2021
• CCellares$18MSeries A · Oct 2020
• AAtreca$125MSeries B+ · Sep 2018

Company	Round with EcoR1 Capital	Total raised	Latest raise
AActio Biosciences Health and bio	Sep 1, 2023 Series A · $55M	$121M	Jun 18, 2025 Series B+
AAktis Oncology Health and bio	Mar 18, 2021 Series A · $72M · lead	$336M	Sep 1, 2024 Series B+
CCellares Health and bio	Oct 1, 2020 Series A · $18M	$357M	Jul 16, 2026 Series B+
AAtreca Health and bio	Sep 12, 2018 Series B+ · $125M	$181M	Feb 5, 2026 Series A

Most frequent co-investors

• CCanaan Partners1 shared round · last Sep 1, 2023
• DDeerfield1 shared round · last Sep 1, 2023
• EEuclidean Capital1 shared round · last Sep 1, 2023
• DDroia Ventures1 shared round · last Sep 1, 2023
• TTCG Crossover1 shared round · last Mar 18, 2021
• BBristol-Myers Squibb1 shared round · last Mar 18, 2021
• MMPM Capital1 shared round · last Mar 18, 2021
• VVida Ventures1 shared round · last Mar 18, 2021
• OOctagon Capital Advisors1 shared round · last Mar 18, 2021
• NNovartis1 shared round · last Mar 18, 2021
• EEclipse1 shared round · last Oct 1, 2020
• 88VC1 shared round · last Oct 1, 2020

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• AAsabys Partners4 companies · 2 deals in 12 mo

Investors whose portfolios on Recent Funding center on the same category (Health and bio).

Portfolio companies are the companies on Recent Funding with a round that lists EcoR1 Capital, which is a subset of its real portfolio. API: /api/v1/investors/ecor1-capital (get a free API key). More: the most active VC firms and new venture capital funds.