Air Street Capital
About Air Street Capital
Air Street opened in 2019 under Nathan Benaich, who runs it as its only general partner and sole investment team member. Before that he had backed AI companies as an angel since 2013, and he was previously a venture partner at Point Nine Capital. He holds a PhD in computational cancer biology from Cambridge and co-wrote the State of AI Report, first published in 2018. The firm's first fund was about $17M, Fund II was $121M, and Fund III reached $232M when it closed in March 2026, which made it the largest solo-GP venture fund in Europe. Assets under management are reported at roughly $400M.
The firm invests only in companies where AI is the main driver of the product, not an add-on feature. Its mandate covers software, science, the physical world and defense, with a focus on Europe and the United States. Examples include Profluent, which received a $9M seed in January 2023 to build AI models for protein medicine design; Sereact, which took a $5M seed in August 2023 for warehouse picking software; and Valence Discovery, where Air Street co-led the seed round before Recursion acquired the company for $47.5M. In September 2026 Air Street led a $40M Series A in Jack & Jill, a hiring platform.
Air Street leads early-stage rounds with checks from $500,000 to $15M and makes select growth investments of up to $25M, according to its Fund III announcement. Third-party trackers show most of its deals at seed and Series A, with a smaller number at pre-seed and a few later rounds.
- Profluent: AI models for designing protein medicines; $9M seed, 2023
- Sereact: software that automates warehouse pick-and-pack, with a foundation model for robot manipulation; $5M seed, 2023
- Lambda Automata: defense technology, including autonomous surveillance towers; EUR 6M seed, 2023
- Valence Discovery: AI drug discovery; co-led seed in 2023, later acquired by Recursion
- Studio Atelico: AI-first games studio; $5M seed, 2025
- Clove: AI-native wealth management platform; $14M seed, 2025, Air Street as co-investor
- Interloom: enterprise AI memory and process automation platform; $16.5M seed, 2026, led by DN Capital with Air Street participating
- Jack & Jill: AI hiring platform; $40M Series A led by Air Street, 2026
- Perceptic: $12M seed, 2026 (Lounge deals desk)
- Macrodata Labs: $4M pre-seed, 2026, led by Air Street (Lounge deals desk)
- airstreet.com/ai-venture-capital
- airstreet.com/team
- nathanbenaich.substack.com/p/fund-iii
- tech.eu/2026/03/23/nathan-benaich-s-air-street-raises-232m-fund-iii-be
- sesamers.com/uncategorized/air-street-capital-232m-fund-iii-nathan-ben
- venturecapitalarchive.com/venture-funds/air-street-capital-airstreet-c
- everythingstartups.com/vc-funds/air-street-capital
- press.airstreet.com/p/2023-review
Investing activity
Air Street Capital has made 47 investments according to Crunchbase across 33 portfolio companies, and has led 14 rounds and seen 2 exits.
Air Street Capital appears in 3 AI deals tracked by the AI Lounge deals desk, rounds totalling $29M, and led 1 of them. The rounds are mostly Seed and Pre-seed, with a median round size of $12M and the largest at $17M. The most recent are Macrodata Labs (Pre-seed, $4M, Jul 2026), Perceptic (Seed, $12M, May 2026) and Interloom Technologies (Seed, $16.5M, Mar 2026).
Air Street Capital most often invests alongside Drysdale Ventures, Kima Ventures, OPRTRS Club and Accel, and the companies it backs on AI Lounge are mostly in AI.
Deals
Frequently asked questions about Air Street Capital
When was Air Street Capital founded?
Air Street Capital was founded in 2019 by Nathan Benaich, who has invested in AI companies since 2013. The firm is based in London.
How big is Air Street Capital's latest fund?
Fund III closed at $232M and was announced on 23 March 2026. The firm says it is the largest solo-GP venture fund in Europe.
What check sizes does Air Street Capital write?
Early-stage checks range from $500,000 to $15M, with select growth investments of up to $25M. The firm backs AI-first companies in the US and Europe.
How do I pitch Air Street Capital?
The firm asks founders to email Nathan Benaich directly at nathan@airstreet.com. The email should describe the company, the AI capability at the core of the product, and the stage of the business.
Which AI companies has Air Street Capital backed?
Its portfolio includes Synthesia, Black Forest Labs, Wayve, Poolside, Profluent and Sereact. Recent rounds include Interloom's $16.5M seed in 2026 and Jack & Jill's $40M Series A.
What AI companies has Air Street Capital invested in?
Air Street Capital's AI investments include Macrodata Labs, Perceptic and Interloom Technologies. The 3 rounds on AI Lounge are listed on this page with amounts, dates and co-investors.
Where is Air Street Capital based?
Air Street Capital is based in St. Peter Port, NA - Guernsey, Guernsey.
What stage does Air Street Capital invest at?
In the rounds tracked on AI Lounge, Air Street Capital has invested at Seed and Pre-seed, with a median round of $12M. Air Street Capital led 1 of those rounds.
Who does Air Street Capital co-invest with?
Air Street Capital's most frequent co-investors on AI Lounge are Drysdale Ventures (1 deal), Kima Ventures (1 deal), OPRTRS Club (1 deal), Accel (1 deal) and Outlier Grove (1 deal).
How can founders reach Air Street Capital?
Founders on AI Lounge can see Air Street Capital's contact details in AI Investor Contacts (paid plans), check for a warm introduction through members who worked with the firm under Warm Paths, and add Air Street Capital to their Investor Pipeline to track the conversation.