Firms

Air Street Capital

London, United Kingdom

signal.nfx.com

Venture capital firm investing exclusively in AI-first companies across frontier AI, infrastructure, autonomy, defense technology, and TechBio.

Founded: 2019
Type: Venture capital

Funds3

Fund III2026-03-232026-03-23$232M
Raised fund commitments, distinct from investee funding and AUM.
Fund II2023-09-062023-09-06$121M
Raised fund commitments, distinct from investee funding and AUM.
Fund I2020-10-292020-10-29$17M
Raised fund commitments, distinct from investee funding and AUM.

Team

Nathan Benaich

Air Street Capital, general_partner

$1M$100K – $5M

London

Co-investing

Creandum

Sereact€25M · 2025-01-20

George C. Petrocheilos

Anagenex$30M · 2022-06-08

Jane Street Capital

Sereact€25M · 2025-01-20

Point Nine Capital

Sereact€25M · 2025-01-20

Investments

team@apexlogos.ai59 minutes ago
Investment-fund research reviewed 2026-10-06. Publicly identified funds, dates, amounts and fundraising status are below. Undisclosed commitments remain unknown; this is not a complete register of private SPVs or parallel entities. Fund sizes and current strategy | Vehicle | Amount / currency | Announcement | Status / interpretation | |---|---|---|---| | First fund / Fund I | US$17 million | 2020-10-29 | Official announcement says raised/new fund, not a target. [Source](https://press.airstreet.com/p/welcome-to-air-street-capital) | | Fund II | US$121,212,121 | 2023-09-06 | Official announcement reports second fund; raised amount, not a target. [Source](https://press.airstreet.com/p/121m-fund-2) | | Fund III | US$232,323,232 (headline US$232M) | 2026-03-23 | Official announcement says raised; [The Next Web](https://thenextweb.com/news/air-street-capital-fund-iii-232m-europe) reports a close on the same date. [Official source](https://press.airstreet.com/p/fund-iii) | Fund III is latest-known from searches for newer funds through the research date; no later fund was found. It backs AI-first companies in North America and Europe and plans to lead early rounds with **US$500,000–$15 million checks**, plus a small number of growth investments up to **US$25 million**. These are investment checks, distinct from fund commitments. [Official announcement, 2026-03-23](https://press.airstreet.com/p/fund-iii) The [current official strategy page](https://www.airstreet.com/ai-venture-capital) (undated, accessed 2026-10-06) explicitly emphasizes pre-seed and seed, often earliest institutional financing, with selective growth investing. Focus: frontier models, AI infrastructure/tooling, autonomy/robotics/defense, agents, and TechBio/life sciences. Signal's Series A rankings do not define the current mandate. The [current team page](https://www.airstreet.com/team) lists Benaich as sole investment staff and Paula Pastor Castaño in legal/operations; the baseline's `/teamold` page is historical and should be replaced as a current-team source. **Do not confuse fund size with ecosystem budgets:** the £2 billion figure in the [2025-09-19 NVIDIA partnership announcement](https://press.airstreet.com/p/air-street-capital-partners-with-nvidia-uk-ai) is NVIDIA's UK AI ecosystem commitment, not an Air Street fund. No independently primary-sourced current AUM figure was established here; do not infer AUM by summing announced funds. Funds recorded in Adex after this review: | Fund | Disclosed amount | Announcement / filing date | | --- | --- | --- | | Fund I | USD 17000000 | 2020-10-29 | | Fund II | USD 121212121 | 2023-09-06 | | Fund III | USD 232323232 | 2026-03-23 |
team@apexlogos.ai2 hours ago
Match research 2026-10-06 / AirStreetCapital / sha256:5ec453c42dd6bbb0d86bb484b446dee0fa8dc3f92b01fdce6680a8131d716750 / part 2 of 2 Imported completed research. Baseline Adex/Signal statements describe prior state, not independent verification. Retain cited attribution, date, currency and classification caveats. Profluent, Anagenex, LabGenius, Exscientia and Recursion are biotechnology/drug-discovery leads; AI or potential neurological applications do not establish direct neurotech. Graphcore's neural-network computing is general AI hardware, not a neural interface. This finding is bounded by accessible public sources and undisclosed portfolio companies. ## Discrepancies and concrete later Adex review notes 1. Add the three distinct fund announcements, especially Fund III, and review null check fields against its explicit current range. Record the selective growth ceiling separately; do not copy Signal's stale figures as current firm facts. 2. Reconcile the 19 existing participation records against the [official portfolio](https://www.airstreet.com/portfolio) (undated, accessed 2026-10-06). Its **`pre-Air Street`** grouping contains Chroma, Crusoe, ElevenLabs, Jukedeck, Lambda, Mapillary, PolyAI, Ravelin, Stripe and Wayve. Their attribution to Air Street funds is unresolved; the heading does not identify the actual personal/prior-firm/SPV vehicle. Do not assume they are fund investments or automatically delete them. Recursion and Synthesia occur in both fund epochs and the earlier grouping, so each needs transaction-specific attribution. 3. Replace generic page citations with actual round announcements where available. Existing null dates/amounts and `isLead: false` do not establish unknown historical facts; avoid inventing dates, amounts, stages or lead status. 4. Consider verified Sereact and Anagenex participations as additions after a separate authorized update; neither appears in the baseline. Profluent can be enriched with the 2025 financing evidence. 5. Preserve a bounded “no verified neurotech found” finding. No complete negative portfolio claim or exhaustive investment audit is justified. All undated URLs above were accessed 2026-10-06. Published dates are shown alongside dated sources. Official claims establish the firm's stated strategy and portfolio; independent investee announcements strengthen transaction attribution. This file authorizes no Adex mutations.
team@apexlogos.ai2 hours ago
Match research 2026-10-06 / AirStreetCapital / sha256:5ec453c42dd6bbb0d86bb484b446dee0fa8dc3f92b01fdce6680a8131d716750 / part 1 of 2 Imported completed research. Baseline Adex/Signal statements describe prior state, not independent verification. Retain cited attribution, date, currency and classification caveats. # Air Street Capital — research handoff - Exact ID: `AirStreetCapital` - Canonical Adex URL: https://adex.page/firms/AirStreetCapital - Research date: 2026-10-06 - Scope: research only; no Adex or database changes made. Air Street Capital is Nathan Benaich's AI-first venture firm, founded in 2019. The latest-known fund found is Fund III: **US$232,323,232 raised**, announced 2026-03-23. Its current mandate combines early-stage investing with selective growth investments. Strong verified deep-tech examples include Sereact's embodied AI robotics and Profluent's AI-designed proteins; no verified direct neurotechnology investment was found. [Fund III announcement, 2026-03-23](https://press.airstreet.com/p/fund-iii) ## Adex and NFX Signal starting evidence The exact-ID snapshot, [`_sources/AirStreetCapital.adex.json`](./_sources/AirStreetCapital.adex.json), was retrieved 2026-10-06 from read-only MCP Search. It describes AI-first investing across frontier AI, infrastructure, autonomy, defense and TechBio; founded 2019; London location; Nathan Benaich as general partner. The investor profile has null check minimum, maximum and sweet spot. Its 19 participation records have no announcement dates, round amounts or investment amounts and primarily cite the firm's general AI venture capital page, rather than individual rounds. Baseline investments: Adept, Alta Ares, Chroma, Crusoe, ElevenLabs, Exscientia, Graphcore, Jukedeck, Lambda Labs, Mapillary, PolyAI, Poolside, Profluent, Ravelin, Recursion Pharmaceuticals, STARK Defence, Stripe, Synthesia and Wayve. The baseline is starting evidence, not independent confirmation of those transactions. [NFX firm page](https://signal.nfx.com/firms/air-street-capital) and [Nathan Benaich profile](https://signal.nfx.com/investors/nathan-benaich) were directly read on 2026-10-06. Signal identifies a UK firm founded in 2019 and Benaich as GP. His profile shows US$100,000–$5 million range, US$1.5 million sweet spot, and US$17 million “current fund size”; AI/biotech seed and Series A rankings, plus fintech tags. These are third-party profile claims and appear stale against Fund III. Investment details and intro paths require Google sign-in; the profile inconsistently displays 27 investments in one field and 18 in another. Reopening the firm page returned a reduced team section, so the dedicated investor URL is the clearer accessible evidence. ## Fund sizes and current strategy | Vehicle | Amount / currency | Announcement | Status / interpretation | |---|---|---|---| | First fund / Fund I | US$17 million | 2020-10-29 | Official announcement says raised/new fund, not a target. [Source](https://press.airstreet.com/p/welcome-to-air-street-capital) | | Fund II | US$121,212,121 | 2023-09-06 | Official announcement reports second fund; raised amount, not a target. [Source](https://press.airstreet.com/p/121m-fund-2) | | Fund III | US$232,323,232 (headline US$232M) | 2026-03-23 | Official announcement says raised; [The Next Web](https://thenextweb.com/news/air-street-capital-fund-iii-232m-europe) reports a close on the same date. [Official source](https://press.airstreet.com/p/fund-iii) | Fund III is latest-known from searches for newer funds through the research date; no later fund was found. It backs AI-first companies in North America and Europe and plans to lead early rounds with **US$500,000–$15 million checks**, plus a small number of growth investments up to **US$25 million**. These are investment checks, distinct from fund commitments. [Official announcement, 2026-03-23](https://press.airstreet.com/p/fund-iii) The [current official strategy page](https://www.airstreet.com/ai-venture-capital) (undated, accessed 2026-10-06) explicitly emphasizes pre-seed and seed, often earliest institutional financing, with selective growth investing. Focus: frontier models, AI infrastructure/tooling, autonomy/robotics/defense, agents, and TechBio/life sciences. Signal's Series A rankings do not define the current mandate. The [current team page](https://www.airstreet.com/team) lists Benaich as sole investment staff and Paula Pastor Castaño in legal/operations; the baseline's `/teamold` page is historical and should be replaced as a current-team source. **Do not confuse fund size with ecosystem budgets:** the £2 billion figure in the [2025-09-19 NVIDIA partnership announcement](https://press.airstreet.com/p/air-street-capital-partners-with-nvidia-uk-ai) is NVIDIA's UK AI ecosystem commitment, not an Air Street fund. No independently primary-sourced current AUM figure was established here; do not infer AUM by summing announced funds. ## Previous deep-tech investments Round amounts below are company-wide raises, not Air Street's undisclosed individual checks. | Company | Technology rationale | Firm attribution / supported round | Evidence | |---|---|---|---| | **Sereact** | Vision-language-action models controlling robots in dynamic physical environments; embodied AI rather than ordinary software automation. | Investee explicitly names Air Street as an existing investor participating in **€25M Series A**, led by Creandum, **2025-01-20**. Air Street says it co-led the 2023 seed with Point Nine. | [Company announcement, 2025-01-20](https://sereact.ai/es/posts/sereact-fundraising-series-a); [Air Street announcement, 2025-01-20](https://press.airstreet.com/p/sereact-series-a). Independently corroborated by [SiliconANGLE, 2025-01-20](https://siliconangle.com/2025/01/20/ai-powered-robotics-startup-sereact-raises-e25-million/). | | **Profluent** | Frontier protein models designing functional genome editors, antibodies and enzymes; programmable biology with experimental validation. | **US$106M financing**, **2025-11-19**, co-led by Altimeter and Bezos Expeditions; existing investor Air Street participates. Firm describes it as its largest Fund II position. Preserve issuer's “financing” wording instead of assuming Series B. | [Issuer Business Wire release republished by StreetInsider, 2025-11-19](https://www.streetinsider.com/Press%2BReleases/Profluent%2BRaises%2B%24106M%2Bto%2BScale%2BFrontier%2BAI%2BModels%2Bfor%2BProgrammable%2BBiology/25635733.html); [Air Street, 2025-11-20](https://press.airstreet.com/p/profluent-106-million-jeff-bezos). Direct [Business Wire URL](https://www.businesswire.com/news/home/20251119356889/en/) returned an internal error. | | **Anagenex** | Machine learning combined with large-scale DNA-encoded molecular libraries and iterative experiments for drug discovery. | Issuer release names Air Street in **US$30M Series A**, **2022-06-08**, led by Catalio, and prior **US$7.2M seed** in 2020. | [Company Business Wire release republished by BioSpace, 2022-06-08](https://www.biospace.com/anagenex-closes-30-million-series-a-round-led-by-catalio-to-advance-small-molecule-drug-discovery-with-a-novel-directed-evolution-platform); [Air Street 2022 review](https://press.airstreet.com/p/2022-review). | | **Graphcore** | Specialized IPU silicon/systems for AI compute. | Official firm portfolio lists Epoch I investment; specific Air Street round/date not established. Do not attach the company's December 2020 US$222M Series E to Air Street without further evidence. | [Firm portfolio](https://www.airstreet.com/portfolio), undated, accessed 2026-10-06; [Graphcore technology/funding announcement, 2020-12-29](https://www.graphcore.ai/posts/graphcore-raises-222-million-in-series-e-funding-round). | Other official portfolio leads include CellVoyant, Gandeeva, LabGenius, Odyssey, STARK and Alta Ares. These merit round-level research before creating transaction records. LabGenius' [2024-05-21 £35M Series B announcement](https://labgeniustx.com/labgenius-raises-35-million-led-by-m-ventures-to-further-develop-its-ml-driven-antibody-discovery-platform-and-progress-a-pipeline-of-assets-towards-the-clinic/) establishes ML antibody discovery and financing, but the visible named-investor list does not establish Air Street participation in that round; a portfolio listing alone is insufficient. ## Neurotech findings **No verified neurotech investment found in the sources checked.** Checks included the full official portfolio, strategy and fund announcements, NFX starting profiles, and searches combining Air Street with neurotechnology, neurotech, brain, and BCI. No source established a direct neural interface, brain sensing/stimulation or other direct neurotechnology company financed by this firm.
team@apexlogos.ai22 days ago
MATCH

€25M2025-01-20	Sereact	Creandum, Point Nine Capital, Jane Street Capital, Air Street Capital
$—Unknown date	Wayve	Air Street Capital
$—Unknown date	Synthesia	Air Street Capital
$—Unknown date	Stripe	Air Street Capital
$—Unknown date	STARK Defence	Air Street Capital
$—Unknown date	Recursion Pharmaceuticals	Air Street Capital
$—Unknown date	Poolside	Air Street Capital
$—Unknown date	PolyAI	Air Street Capital
$—Unknown date	Mapillary	Air Street Capital
$—Unknown date	Graphcore	Air Street Capital
$—Unknown date	ElevenLabs	Air Street Capital
$—Unknown date	Crusoe	Air Street Capital
$—Unknown date	Alta Ares	Air Street Capital
$—Unknown date	Adept	Air Street Capital
$30M2022-06-08	Anagenex	George C. Petrocheilos, Air Street Capital
$—Unknown date	Ravelin	Air Street Capital
$—Unknown date	Profluent	Air Street Capital
$—Unknown date	Lambda Labs	Air Street Capital
$—Unknown date	Jukedeck	Air Street Capital
$—Unknown date	Exscientia	Air Street Capital
$—Unknown date	Chroma	Air Street Capital