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UK Startups and Innovation
21SEP

Dex closes $5.3m matching ML talent

2 min read
16:52UTC

Dex closed a $5.3m seed on Tuesday 28 April from Notion Capital, a16z Speedrun, Concept Ventures and OpenAI angels at $1.8m of annualised recurring revenue, matching machine-learning engineers to clients including Granola, Synthesia and ElevenLabs.

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Key takeaway

Dex closed $5.3m on 28 April at $1.8m ARR with Notion Capital and OpenAI angels.

Dex closed a $5.3 million seed on 28 April 2026 with $1.8 million of ARR (annualised recurring revenue) 1. Notion Capital led; a16z Speedrun, Concept Ventures and angels from OpenAI participated. The London platform matches machine-learning engineers to clients including Granola, Synthesia and ElevenLabs.

Dex's syndicate is the post-VCT-cut investor map at the AI talent tier in pure form. Notion Capital plus a16z Speedrun plus Concept Ventures plus OpenAI angels reads as a syndicate built for AI-native bets at the seed stage; retail-investor pools from the relief regime that closed earlier in April do not appear. OpenAI angels in particular write into companies that touch the model layer or its labour market, and Dex's product is an explicit hire-side bet on that labour market.

Granola's presence as a Dex client is a data point on the density of London's AI ecosystem. The note-taking unicorn raised $125m at a $1.5bn valuation in March and is now sourcing ML talent through a London-based platform that itself has British investors and American operator angels, which is the kind of within-cluster flow that turns regional density into a moat.

The ARR-to-round ratio also matters. $1.8m of ARR against a $5.3m seed implies a multiple in the high single digits, modest by AI-platform standards and consistent with a syndicate that is pricing on operator-network economics rather than topline growth. The bet is that OpenAI angels and Notion Capital can route demand from their portfolios; the cheque is paying for the network advantage the platform inherits.

Deep Analysis

In plain English

Dex helps companies hire machine-learning engineers, the specialists who build and maintain AI systems. Instead of posting job adverts on LinkedIn, companies pay Dex to match them with vetted ML engineers who are open to new work. At $1.8m in annualised recurring revenue, Dex already has paying customers. The $5.3m seed raised on 28 April funds growth of the matching platform, including the team needed to vet more engineers and serve more clients. OpenAI investors joined the round, which signals that Dex's client network overlaps with companies building products on OpenAI's technology. Those companies are among the fastest-growing engineering employers in the UK right now, and OpenAI benefits when its customers can hire AI talent faster.

Sources:Beauhurst
Mentions:Dexory →Notion Capital →a16z Speedrun →Concept Ventures →OpenAI →Granola →Synthesia →ElevenLabs →Google DeepMind →Google →Airbnb →Anthropic →
First Reported In

Update #3 · SAIU rides $1.1bn Ineffable seed; hardware looms

Beauhurst· 1 May 2026
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Causes and effects
Caused by
VCTs hit £917.7m record, brace for 65% fall
VCT fundraising at £917.7m record before the cut; Dex round completed without VCT-backed angels in the post-cut investor map.
Occurred 14 Apr 2026
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