In a little more than a year, 25-year-old Ali Ansari has turned a small AI recruiting business into a US$4 billion provider of training data to the biggest AI labs.
His AI data startup, San Francisco-based Micro1, has raised a fresh funding round of more than US$100 million at a valuation of $4 billion, according to two people familiar with the deal.
The company counts frontier AI labs, Microsoft, Amazon and robotics companies like 1X as customers. Several of them are participating in the new round, including two frontier labs and two of xAI’s cofounders, the sources said.
Micro1 declined to comment.
The fundraise catapults Micro1’s valuation eightfold in just a year, up from US$500 million in September 2025.
It’s a quick rise for the solo founder, who at the beginning of last year was running an AI recruiting business generating roughly US$7 million annually.
Micro1’s transformation began when another data-labelling company asked it to help recruit hundreds of engineers.
Ansari realised that the larger opportunity was not simply finding technical workers, but supplying frontier AI companies with high-quality, human-created data needed to train and evaluate their models. He quickly repositioned Micro1 around locating people who could create such data, using its AI interviewer to find and vet engineers, doctors, lawyers and other domain experts. By December 2025, eight months into that pivot, Micro1 had crossed US$100 million in annualised revenue.
The company’s growth has continued. In August, TechCrunch reported that Micro1 had reached a US$500 million gross annual run rate.
In addition to expert data, Micro1 has recently been getting into the game of providing “reinforcement learning gyms”. These are simulated environments, created with real-world enterprise data, where AI agents can practise navigating workplaces. Defunct companies’ Slack and email threads are particularly useful for this.
Micro1 has tried to buy proprietary corporate data, submitting a late bid of US$12.5 million for a portion of bankrupt carrier Spirit Airlines’ operational data, challenging Google’s winning US$10 million bid.
The bankruptcy court has not decided yet who will get to purchase the data. Micro1 also has gotten into the robotics training data game, and Ansari recently posted to X that Micro1 is paying US$50 to US$90 per hour for people to annotate videos of robots performing tasks.
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