AI investors — September 2026 · Sep 1, 2026 – Sep 30, 2026

Investors backing AI companies across stages, from applications to infrastructure.

121

Plug and PlayLatest Sep 21

Metris Energy · $5M Seed Isometric · $10M Series A

2rounds

0led

Climate tech 2

Seed 1, Series A 1

Sep 21, 2026

Details

New companies 2 · Follow-on 0

Stages: Seed 1, Series A 1

Metris Energy $5M Seed Isometric $10M Series A

122

Activate CapitalLatest Sep 17

Crusoe · $3.9B Series F (initial close; anticipated total)Rune · $40M Series A

2rounds

0led

AI 1Climate tech 1

Series A 1, Series C+ 1

Sep 17, 2026

Details

New companies 2 · Follow-on 0

Stages: Series A 1, Series C+ 1

Crusoe $3.9B Series F (initial close; anticipated total)Rune $40M Series A

123

AltimeterLatest Sep 17

Crusoe · $3.9B Series F (initial close; anticipated total)SciFin · $44M Seed

2rounds

1led

AI 2

Seed 1, Series C+ 1

Sep 17, 2026

Details

New companies 2 · Follow-on 0

Stages: Seed 1, Series C+ 1

Crusoe $3.9B Series F (initial close; anticipated total)SciFin $44M Seed

124

Cambium CapitalLatest Sep 17

Arcee AI · ≥$150M Series B Polaris Electro-Optics · $50M Series B

2rounds

1led

AI 1Hardware 1

Series B 2

Sep 17, 2026

Details

New companies 2 · Follow-on 0

Stages: Series B 2

Arcee AI ≥$150M Series B Polaris Electro-Optics $50M Series B

125

Founders FundLatest Sep 17

Crusoe · $3.9B Series F (initial close; anticipated total)Cognition · >$2B Series E

2rounds

0led

AI 2

Series C+ 2

Sep 17, 2026

Details

New companies 1 · Follow-on 1

Stages: Series C+ 2

Crusoe $3.9B Series F (initial close; anticipated total)Cognition >$2B Series E

126

Gradient VenturesLatest Sep 17

Polyphron · $20M Seed BackOps · $42M Series B

2rounds

0led

Biotech 1Enterprise software 1

Seed 1, Series B 1

Sep 17, 2026

Details

New companies 2 · Follow-on 0

Stages: Seed 1, Series B 1

Polyphron $20M Seed BackOps $42M Series B

127

IAG Capital PartnersLatest Sep 17

Arcee AI · ≥$150M Series B Cornelis Networks · ~$205M Funding round

2rounds

1led

AI 2

Series B 1, Undisclosed 1

Sep 17, 2026

Details

New companies 2 · Follow-on 0

Stages: Series B 1, Undisclosed 1

Arcee AI ≥$150M Series B Cornelis Networks ~$205M Funding round

128

JAFCO Group Co., Ltd.Latest Sep 17

QueryLift, Inc. · ¥100M Seed nocall, Inc. · ~¥800M Series A

2rounds

1led

AI 2

Seed 1, Series A 1

Sep 17, 2026

Details

New companies 2 · Follow-on 0

Stages: Seed 1, Series A 1

QueryLift, Inc. ¥100M Seed nocall, Inc. ~¥800M Series A

129

Kadmos CapitalLatest Sep 17

Big Picture Bio · £2.2M Pre-seed and Innovate UK grant package Aeon · Undisclosed Seed extension

2rounds

1led

Biotech 1Healthtech 1

Pre-seed 1, Seed 1

Sep 17, 2026

Details

New companies 2 · Follow-on 0

Stages: Pre-seed 1, Seed 1

Big Picture Bio £2.2M Pre-seed and Innovate UK grant package Aeon Undisclosed Seed extension

130

MayfieldLatest Sep 17

Hello Haven · $15M Pre-Seed Hang Ten Systems · $53M Additional seed funding

2rounds

1led

AI 2

Pre-seed 1, Seed 1

Sep 17, 2026

Details

New companies 1 · Follow-on 1

Stages: Pre-seed 1, Seed 1

Hello Haven $15M Pre-Seed Hang Ten Systems $53M Additional seed funding

131

Qatar Investment AuthorityLatest Sep 17

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

132

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

133

Ribbit CapitalLatest Sep 17

Crusoe · $3.9B Series F (initial close; anticipated total)Artificial Intelligence Underwriting Company (AIUC) · $40M Series A

2rounds

1led

AI 2

Series A 1, Series C+ 1

Sep 17, 2026

Details

New companies 2 · Follow-on 0

Stages: Series A 1, Series C+ 1

Crusoe $3.9B Series F (initial close; anticipated total)Artificial Intelligence Underwriting Company (AIUC) $40M Series A

134

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

135

The Westly GroupLatest Sep 17

Magentic · $18M Series A Noetive · $41M Seed

2rounds

0led

AI 1Enterprise software 1

Seed 1, Series A 1

Sep 17, 2026

Details

New companies 2 · Follow-on 0

Stages: Seed 1, Series A 1

Magentic $18M Series A Noetive $41M Seed

136

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

137

a16z SpeedrunLatest Sep 16

Orbits · ~$2M Pre-seed Keewano · $12M Seed

2rounds

1led

AI 2

Pre-seed 1, Seed 1

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Pre-seed 1, Seed 1

Orbits ~$2M Pre-seed Keewano $12M Seed

138

Aramco VenturesLatest Sep 16

Hang Ten Systems · $53M Additional seed funding DeepCtrls · Undisclosed Series B+

2rounds

0led

AI 2

Seed 1, Series B 1

Sep 16, 2026

Details

New companies 1 · Follow-on 1

Stages: Seed 1, Series B 1

Hang Ten Systems $53M Additional seed funding DeepCtrls Undisclosed Series B+

139

Archetype VenturesLatest Sep 16

Voxela, Inc. · Undisclosed Series A nocall, Inc. · ~¥800M Series A

2rounds

1led

AI 1Healthtech 1

Series A 2

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Series A 2

Voxela, Inc. Undisclosed Series A nocall, Inc. ~¥800M Series A

140

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

141

Craft VenturesLatest Sep 16

Noetive · $41M Seed GenHealth.ai · $16.5M Series A

2rounds

0led

AI 1Healthtech 1

Seed 1, Series A 1

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Seed 1, Series A 1

Noetive $41M Seed GenHealth.ai $16.5M Series A

142

Eli Lilly and CompanyLatest Sep 16

Thatch · $108M New funding Superluminal Medicines · $60M Series B

2rounds

0led

Biotech 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 Superluminal Medicines $60M Series B

143

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

144

Garage CapitalLatest Sep 16

Orbits · ~$2M Pre-seed Onix · $5M Pre-seed

2rounds

0led

AI 2

Pre-seed 2

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Pre-seed 2

Orbits ~$2M Pre-seed Onix $5M Pre-seed

145

IDG CapitalLatest Sep 16

Anew Labs · $290M Funding Apex Intelligence · Undisclosed Angel

2rounds

2led

AI 1Biotech 1

Undisclosed 2

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Undisclosed 2

Anew Labs $290M Funding Apex Intelligence Undisclosed Angel

146

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

147

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

148

Scale Venture PartnersLatest Sep 16

Thatch · $108M New funding Inspiren · $70M Series C

2rounds

0led

Healthtech 2

Series C+ 1, Undisclosed 1

Sep 16, 2026

Details

New companies 2 · Follow-on 0

Stages: Series C+ 1, Undisclosed 1

Thatch $108M New funding Inspiren $70M Series C

149

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

150

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

“—” 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.