Air Street Capital
Venture capital firm investing in AI-first and deep-tech companies.
Air Street Capital is a London-based, solo-GP venture capital firm founded by Nathan Benaich, investing in AI-first companies across North America and Europe. Benaich, a computational cancer researcher by background, co-authors the widely cited annual State of AI Report and founded the RAAIS Foundation/Summit. The firm closed a $232M Fund III in 2026 — the largest solo-GP VC fund raised in Europe — and invests across software, science, the physical world, and defense. Portfolio companies include Synthesia, Black Forest Labs, Sereact, Profluent, Delian Alliance Industries, and Poolside.
Overview
- Firm
- Air Street Capital
- Headquarters
- London, UK
- Founded
- 2019
- AUM
- Undisclosed
- Stages
- Seed, Series A
- Thesis
- Backing AI-first companies across defense, life sciences, and infrastructure.
Portfolio companies3
- CompanyDelian Alliance IndustriesUK developer of autonomous anti-access/area denial systems for surveillance and deterrence.
- CompanyPolar MistSwedish maritime-autonomy startup building Semper, an unmanned surface vessel with a proprietary optical/vision-based, GPS-free navigation system for contested environments.
- CompanyOnodrimAmsterdam-based defense industrial platform helping established European defense/industrial producers scale manufacturing capacity, multi-domain sensing, and networked systems.
Partners1
Frequently asked
- What is Air Street Capital?
- Backing AI-first companies across defense, life sciences, and infrastructure.
- What stages does Air Street Capital invest at?
- Air Street Capital invests at Seed, Series A.
Sources & citations1
Each claim links to its underlying source. Confidence reflects how directly the source supports the claim.
- 1
Air Street Capital closed a $232M Fund III in 2026, the largest solo-GP VC fund in Europe; founded by Nathan Benaich; portfolio includes Synthesia, Black Forest Labs, Sereact, Profluent, Delian Alliance Industries, Poolside.
The AI Insider: Air Street Capital Closes $232M Fund to Back Next Generation of AI-First StartupsReported2026-03-24