Air Street Capital is a venture firm founded by Nathan Benaich that invests in AI-first companies across Europe and the United States. Its portfolio spans generated media, coding, biology and autonomous driving, while its State of AI Report provides a separate research perspective on the field.
Air Street invests exclusively in AI-first companies - businesses for which advances in AI are the primary driver of product capability, competitive advantage and long-term value. It focuses on AI-first software (frontier models, AI SaaS, agents, world models), developer tools and infrastructure, TechBio and science, and defence and security, in the US and Europe.
The firm invests from Pre-Seed through growth, leading early-stage rounds of $500K to $15M and selectively making growth investments of up to $25M. As a solo-GP firm, a single decision-maker enables high-conviction, fast decisions with significant capital behind the most ambitious teams.
Beyond capital, Air Street is known for hands-on engagement on product, technical strategy and market positioning from day one, and for backing founders it has often known for years through its network, events and prior investments.
Air Street publishes the State of AI Report - the most widely read independent annual analysis of AI progress - essays via Air Street Press, runs the RAAIS research summit and the Air Street AI Network, and drove policy reform through spinout.fyi, using research-driven conviction to find non-consensus opportunities early.
Air Street Capital is a London-based venture firm founded in 2019 by Nathan Benaich. Its US$232M Fund III, closed in March 2026, is the largest solo-GP venture fund in Europe.
Fund III vintage (announced Mar 2026): frontier AI, AI infrastructure, AI-for-science, defence and applied AI across Europe and the US.
European defence (EU)
Air defence (FR)
AI infrastructure (FR)
Defence (EU)
AI for science (UK)
AI video generation platform (UK)
Multimodal AI; open visual-intelligence models incl. FLUX (DE)
Fund II era: frontier evals, world models, robotics, TechBio, enterprise automation and defence/autonomy.
Frontier model evaluation (USA)
AI wealth management (UK)
Long-horizon reasoning agents (UK)
AI for clinical trials (USA/UK)
Maritime autonomy (EU)
AI game studio (USA/UK)
AI lifestyle software (USA)
Enterprise automation (DE)
World models / interactive AI (US/UK)
AI-first navigation for autonomous defence systems (EU)
Physical AI / embodied robotics for warehouses (DE)
AI knowledge discovery for finance (USA)
Programmable biology & protein language models (USA)
Earlier portfolio records retain their fund-vintage context. Ownership and operating status should be checked separately from the original investment relationship.
AI cell-biology forecasting (UK)
Video intelligence (UK/USA)
AI-driven pharma (UK) - NASDAQ: EXAI, merged into Recursion
Structural biology (CA)
Cultivated cell-based meat (FR)
AI semiconductors (UK) - acquired by SoftBank
Liquid-biopsy diagnostics (FI/CH)
AI workplace safety (TR)
AI protein therapeutics (UK)
Cultivated fat (USA)
AI for defence (USA)
Enterprise AI for software engineering / frontier coding lab (USA)
AI-driven pharma (USA) - NASDAQ: RXRX
AI-driven drug discovery (CA) - acquired by Recursion; now Valence Labs
Computer-vision data platform (UK)
Personalised nutrition from gut-microbiome science (UK)
Angel and personal investments made by Nathan Benaich before founding Air Street in 2019 (Stripe, Wayve, ElevenLabs, Synthesia and more).
Remote engineering teams (USA)
Lab automation systems (UK)
Open-source vector database for AI (USA)
Enterprise AI grounded in context / RAG (USA)
AI cloud / clean compute for frontier AI (USA)
AI audio and voice generation (USA/UK)
GPU cloud for AI training and inference (USA)
Street-level imagery and mapping platform (SE) - acquired by Meta
Climate & Earth-observation satellite constellations (USA)
Frontier AI research lab (USA)
Real-world AR games (USA) - acquired by Scopely
AI-powered hedge fund / data science tournament (USA)
Autonomous indoor vertical farms (UK)
AI voice assistants (UK)
AI fraud prevention (UK) - acquired by Worldpay
Engineering tools (UK)
Core-banking platform (UK)
AI for insurance claims (UK)
Autonomous last-mile delivery robots (EE)
Online payments (USA)
Embodied AI for autonomous driving - AV2.0 (UK)
Radical VenturesRadical Ventures is a Toronto-based venture firm focused exclusively on AI. It ranks among the world's largest AI-dedicated VCs, with a US$800M growth fund (2024) and a US$650M early-stage fund closed in October 2025. Its ~59-company portfolio spans foundation models, robotics, AI infrastructure, and AI for science and health.
AIX VenturesAIX Ventures is a venture firm founded in 2021 by active AI practitioners, backing companies where AI is core to the product. It invests pre-seed to Series A and manages roughly US$252M across two funds. Its 73-company portfolio spans Hugging Face, Perplexity, Weights & Biases, You.com, Replicate and Windsurf.
Andreessen HorowitzEarly bets in models and developer tools.
By making speed the feature. As a solo-GP firm, Nathan Benaich is the single decision-maker, which the firm says enables high-conviction calls with significant capital behind them — and European LPs accepted the trade at scale: the March 2026 US$232M Fund III closed as the largest solo-GP venture fund in Europe, leading rounds of US$500K–15M with growth checks to US$25M.
No — the page quarantines them under 'Pre-Air Street': angel and personal investments Nathan Benaich made before founding the firm in 2019, alongside Lambda, Mapillary and others. The distinction matters for attribution: fund positions span the three Epochs, while the personal book explains his access and pattern recognition. It is the same personal-versus-fund separation this site applies to angel pages, applied inside a firm page.
Because the page layers two capital sources on one company: the Pre-Air Street group records Benaich's personal angel stake from before 2019 — the blurb names Synthesia among Stripe, Wayve and ElevenLabs — while the Epoch III group shows the fund's current AI-video position. Same company, two books: the angel entry that seeded the conviction and the fund position that continues it.
As a sourcing moat. The research franchise — the State of AI Report, Air Street Press, the RAAIS summit, spinout.fyi — is described as the engine for 'research-driven conviction to find non-consensus opportunities early'. Publishing annually keeps a solo GP in structured contact with the field his fund invests in exclusively, and spinout.fyi's policy work on UK spinouts reaches deal flow no cold outbound touches.
The vintage groupings provide historical context for the selected portfolio. Compare the companies within each group by business model and the timing of the disclosed backing; do not assume the list is complete or that historical investments remain current holdings.
No. A research report can discuss companies the fund does not own. On Air Street's profile, separate investment records from companies cited in ecosystem research; portfolio participation needs its own evidence.