US startup investors — September 2026 · Sep 1, 2026 – Sep 30, 2026

Recent funding activity in US startups, organised by investor and their role in each round.

151

Crusoe · $3.9B Series F (initial close; anticipated total)Positron AI · ≤$875M Series C and Series C-1 financing package

2rounds

0led

AI 1Hardware 1

Series C+ 2

Sep 17, 2026

Details

New companies 2 · Follow-on 0

Stages: Series C+ 2

Crusoe $3.9B Series F (initial close; anticipated total)Positron AI ≤$875M Series C and Series C-1 financing package

152

Quiet CapitalLatest Sep 17

Polyphron · $20M Seed Thatch · $108M New funding

2rounds

1led

Biotech 1Healthtech 1

Seed 1, Undisclosed 1

Sep 17, 2026

Details

New companies 2 · Follow-on 0

Stages: Seed 1, Undisclosed 1

Polyphron $20M Seed Thatch $108M New funding

153

Silversmith Capital PartnersLatest Sep 17

Vantora · >$100M Growth investment Perry Weather · $110M Funding

2rounds

1led

Climate tech 1Enterprise software 1

Growth 1, Undisclosed 1

Sep 17, 2026

Details

New companies 2 · Follow-on 0

Stages: Growth 1, Undisclosed 1

Vantora >$100M Growth investment Perry Weather $110M Funding

154

T. Rowe PriceLatest Sep 17

Crusoe · $3.9B Series F (initial close; anticipated total)Temporal · $550M Series E

2rounds

0led

AI 1Developer tools 1

Series C+ 2

Sep 17, 2026

Details

New companies 2 · Follow-on 0

Stages: Series C+ 2

Crusoe $3.9B Series F (initial close; anticipated total)Temporal $550M Series E

155

Archetype VenturesLatest Sep 16

Voxela, Inc. · Undisclosed Series A Bulwark Dynamics · $6.8M Seed

2rounds

0led

Defense tech 1Healthtech 1

Seed 1, Series A 1

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Seed 1, Series A 1

Voxela, Inc. Undisclosed Series A Bulwark Dynamics $6.8M Seed

156

Avid VenturesLatest Sep 16

Thatch · $108M New funding Ferry Health · $9M Seed

2rounds

0led

Healthtech 2

Seed 1, Undisclosed 1

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Seed 1, Undisclosed 1

Thatch $108M New funding Ferry Health $9M Seed

157

Euclidean CapitalLatest Sep 16

Circle Pharma, Inc. · $92.5M Series E Savvy Wealth · $100M Series C

2rounds

0led

Biotech 1Fintech 1

Series C+ 2

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Series C+ 2

Circle Pharma, Inc. $92.5M Series E Savvy Wealth $100M Series C

158

Flare Capital PartnersLatest Sep 16

Kairon Health · $5M Seed GenHealth.ai · $16.5M Series A

2rounds

2led

Healthtech 2

Seed 1, Series A 1

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Seed 1, Series A 1

Kairon Health $5M Seed GenHealth.ai $16.5M Series A

159

ForbionLatest Sep 16

Sling Therapeutics, Inc. · $123M Series C Solstice Oncology · $225M Series A

2rounds

1led

Biotech 2

Series A 1, Series C+ 1

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Series A 1, Series C+ 1

Sling Therapeutics, Inc. $123M Series C Solstice Oncology $225M Series A

160

Liquid 2 VenturesLatest Sep 16

Noetive · $41M Seed Aslan Protects · $20.8M Seed

2rounds

0led

AI 1Defense tech 1

Seed 2

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Seed 2

Noetive $41M Seed Aslan Protects $20.8M Seed

161

Obvious VenturesLatest Sep 16

Mithrl · $20M Series A GenHealth.ai · $16.5M Series A

2rounds

1led

AI 1Healthtech 1

Series A 2

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Series A 2

Mithrl $20M Series A GenHealth.ai $16.5M Series A

162

QuantumLightLatest Sep 16

Thatch · $108M New funding Gimlet Labs · $300M Series B

2rounds

0led

AI 1Healthtech 1

Series B 1, Undisclosed 1

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Series B 1, Undisclosed 1

Thatch $108M New funding Gimlet Labs $300M Series B

163

SemiAnalysis CapitalLatest Sep 16

TeRAM · $37M Funding Positron AI · ≤$875M Series C and Series C-1 financing package

2rounds

2led

Hardware 2

Series C+ 1, Undisclosed 1

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Series C+ 1, Undisclosed 1

TeRAM $37M Funding Positron AI ≤$875M Series C and Series C-1 financing package

164

SemperVirensLatest Sep 16

Thatch · $108M New funding Epsilon Health · $27.6M Funding

2rounds

0led

Healthtech 2

Undisclosed 2

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Undisclosed 2

Thatch $108M New funding Epsilon Health $27.6M Funding

165

Breakthrough Energy VenturesLatest Sep 15

Planted · $31.8M Funding Physical Superintelligence (PSI) · $58M Seed

2rounds

1led

AI 1Climate tech 1

Seed 1, Undisclosed 1

Sep 15, 2026

Details

New companies 2 · Follow-on 0

Stages: Seed 1, Undisclosed 1

Planted $31.8M Funding Physical Superintelligence (PSI) $58M Seed

166

ChemistryLatest Sep 15

Liquid Compute · $15M Seed Wafer · $40M Series A

2rounds

2led

AI 1Hardware 1

Seed 1, Series A 1

Sep 15, 2026

Details

New companies 2 · Follow-on 0

Stages: Seed 1, Series A 1

Liquid Compute $15M Seed Wafer $40M Series A

167

EvanticLatest Sep 15

Profound · $180M Series D Harvey · $550M Series H

2rounds

0led

AI 2

Series C+ 2

Sep 15, 2026

Details

New companies 1 · Follow-on 1

Stages: Series C+ 2

Profound $180M Series D Harvey $550M Series H

168

Global BrainLatest Sep 15

RegCell, Inc. · $44M Series A Reframe Systems · $40M Additional funding

2rounds

0led

Biotech 1Proptech 1

Series A 1, Undisclosed 1

Sep 15, 2026

Details

New companies 2 · Follow-on 0

Stages: Series A 1, Undisclosed 1

RegCell, Inc. $44M Series A Reframe Systems $40M Additional funding

169

Kleiner PerkinsLatest Sep 15

Profound · $180M Series D Harvey · $550M Series H

2rounds

1led

AI 2

Series C+ 2

Sep 15, 2026

Details

New companies 1 · Follow-on 1

Stages: Series C+ 2

Profound $180M Series D Harvey $550M Series H

170

Labcorp Venture FundLatest Sep 15

Evvy · $40M Series B N-Power Medicine · $32M Series B

2rounds

0led

Healthtech 2

Series B 2

Sep 15, 2026

Details

New companies 2 · Follow-on 0

Stages: Series B 2

Evvy $40M Series B N-Power Medicine $32M Series B

171

MatrixLatest Sep 15

Delos Data · >$100M Funding Light · $46M Series A

2rounds

1led

AI 1Climate tech 1

Series A 1, Undisclosed 1

Sep 15, 2026

Details

New companies 2 · Follow-on 0

Stages: Series A 1, Undisclosed 1

Delos Data >$100M Funding Light $46M Series A

172

Menlo VenturesLatest Sep 15

Factory · $200M Funding Gimlet Labs · $300M Series B

2rounds

0led

AI 1Developer tools 1

Series B 1, Undisclosed 1

Sep 15, 2026

Details

New companies 1 · Follow-on 1

Stages: Series B 1, Undisclosed 1

Factory $200M Funding Gimlet Labs $300M Series B

173

M VenturesLatest Sep 15

Polaris Electro-Optics · $50M Series B TwoStep Therapeutics · $62.5M Series A

2rounds

0led

Biotech 1Hardware 1

Series A 1, Series B 1

Sep 15, 2026

Details

New companies 2 · Follow-on 0

Stages: Series A 1, Series B 1

Polaris Electro-Optics $50M Series B TwoStep Therapeutics $62.5M Series A

174

National Bank of CanadaLatest Sep 15

38 Degrees North · $260M Credit facility Blee · $20M Series A

2rounds

1led

Climate tech 1Enterprise software 1

Series A 1, Undisclosed 1

Sep 15, 2026

Details

New companies 2 · Follow-on 0

Stages: Series A 1, Undisclosed 1

38 Degrees North $260M Credit facility Blee $20M Series A

175

New Enterprise Associates (NEA)Latest Sep 15

Factory · $200M Funding Positron AI · ≤$875M Series C and Series C-1 financing package

2rounds

1led

Developer tools 1Hardware 1

Series C+ 1, Undisclosed 1

Sep 15, 2026

Details

New companies 2 · Follow-on 0

Stages: Series C+ 1, Undisclosed 1

Factory $200M Funding Positron AI ≤$875M Series C and Series C-1 financing package

176

Piva CapitalLatest Sep 15

Branch Energy · $33M Series B Planted · $31.8M Funding

2rounds

2led

Climate tech 2

Series B 1, Undisclosed 1

Sep 15, 2026

Details

New companies 2 · Follow-on 0

Stages: Series B 1, Undisclosed 1

Branch Energy $33M Series B Planted $31.8M Funding

177

RA Capital Management (Planetary Health)Latest Sep 15

Planted · $31.8M Funding Reframe Systems · $40M Additional funding

2rounds

1led

Climate tech 1Proptech 1

Undisclosed 2

Sep 15, 2026

Details

New companies 2 · Follow-on 0

Stages: Undisclosed 2

Planted $31.8M Funding Reframe Systems $40M Additional funding

178

Monta Vista CapitalLatest Sep 14

BoomerangHR · $12.7M Seed BQP · Undisclosed Strategic investment

2rounds

0led

AI 1Enterprise software 1

Seed 1, Undisclosed 1

Sep 14, 2026

Details

New companies 2 · Follow-on 0

Stages: Seed 1, Undisclosed 1

BoomerangHR $12.7M Seed BQP Undisclosed Strategic investment

179

TCVLatest Sep 14

Archy · $50M Series C Upwind Security · ~$300M Funding

2rounds

1led

Cybersecurity 1Healthtech 1

Series C+ 1, Undisclosed 1

Sep 14, 2026

Details

New companies 1 · Follow-on 1

Stages: Series C+ 1, Undisclosed 1

Archy $50M Series C Upwind Security ~$300M Funding

180

Wellington ManagementLatest Sep 14

Temporal · $550M Series E Clay · $115M Series D

2rounds

2led

AI 1Developer tools 1

Series C+ 2

Sep 14, 2026

Details

New companies 2 · Follow-on 0

Stages: Series C+ 2

Temporal $550M Series E Clay $115M Series D

“—” in Led means every role for that investor in this period is undisclosed; it does not mean zero leads. New companies counts the first participation in a company in our records; follow-on counts later participation.