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Active: new deal Aug 2025 Verified 4 Nov 2026

RA Capital

Boston multi-stage investor and company builder in healthcare and planetary health.

Type
VC firm
Location
Boston, Massachusetts, United States
Stages
Pre-seed, Seed, Series A, Series B, Growth, Any stage
Backs
Biotech and pharma
Sectors
Biotech, Healthtech and life sciences, Climate and cleantech, Energy
Fund size / AUM
$881M RA Capital Nexus Fund III (Form D amount sold, 2021)
Latest fund or filing
22 Jul 2025
Portfolio mix
Biotech and pharma 88%; Medtech and digital health 4%; Climate and energy 4%; B2B software 4% (n=29, 2015 to 2026)

Fund filings (SEC Form D)

Latest fund on file
RA Capital Planetary Health International Fund
Filed
22 Jul 2025 (amendment)
Fund size
$30M (amount sold)

See this fund's filings on SEC EDGAR

Contacts on file

For RA Capital, the paid file holds: 8 named decision-makers with roles; LinkedIn page.

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Notable investments

Abcuro Portco Hover Image smAclaris Portco Hover ImageAcrivon Portco Hover ImageAcumen PharmaceuticalsAdagio Medical Hover Image

Sources

Last checked 4 Nov 2026. Is something wrong? Tell us.

Appears in 69 lists

Energy investors in Massachusetts (15)Series A investors in Massachusetts (18)Growth-stage investors in Massachusetts (18)Climate tech investors in Massachusetts (19)Series B climate tech investors in the US (27)Series B energy investors in the US (29)Series B biotech investors in the US (34)Growth-stage climate tech investors in the US (34)Biotech investors in Massachusetts (37)Growth-stage energy investors in the US (42)Growth-stage biotech investors in the US (44)Pre-seed investors in Massachusetts (48)Series B energy investors (55)Healthtech investors in Massachusetts (58)Series A biotech investors in the US (59)Seed investors in Massachusetts (60)Series A climate tech investors in the US (60)Series A energy investors in the US (60)Series B healthtech investors in the US (69)Series B biotech investors (73)Pre-seed energy investors in the US (73)Pre-seed biotech investors in the US (81)Pre-seed climate tech investors in the US (84)Series B climate tech investors (98)Growth-stage energy investors (102)Growth-stage biotech investors (109)Growth-stage healthtech investors in the US (121)Pre-seed energy investors (126)Series A energy investors (139)Seed energy investors in the US (140)Pre-seed biotech investors (148)Series A biotech investors (153)Seed biotech investors in the US (159)Series B healthtech investors (160)Seed climate tech investors in the US (162)Series A healthtech investors in the US (164)Series B investors in the US (165)Venture capital firms in Massachusetts (185)Growth-stage climate tech investors (189)Pre-seed healthtech investors in the US (225)Pre-seed climate tech investors (230)Energy venture capital firms in the US (249)Climate tech venture capital firms in the US (256)Seed energy investors (261)Series A climate tech investors (263)Growth-stage investors in the US (288)Biotech venture capital firms in the US (297)Seed biotech investors (300)Growth-stage healthtech investors (316)Series B investors (339)Series A investors in the US (372)Series A healthtech investors (401)Pre-seed healthtech investors (408)Energy investors (421)Seed healthtech investors in the US (437)Seed climate tech investors (458)Biotech investors (484)Pre-seed investors in the US (549)Climate tech investors (660)Growth-stage investors (705)Healthtech venture capital firms in the US (709)Seed healthtech investors (800)Series A investors (864)Pre-seed investors (988)Seed investors in the US (1,043)Healthtech investors (1,207)Active venture capital firms in the US (1,574)Seed investors (1,892)Venture capital firms in the US (2,975)