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Micro1, a three-year-old startup specializing in AI data labeling and contractor management, has secured a $35 million Series A round led by 01 Advisors. The funding values the company at $500 million and brings Twitter veterans Dick Costolo and Adam Bain deeper into the business, with Bain also joining the board.
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CEO Ali Ansari, just 24, said Micro1 is helping fill a critical gap created after AI giants like OpenAI and Google pulled back from Scale AI following Meta’s $14 billion investment in that company. “Really the only way models are now learning is through net new human data. Micro1 is at the core of providing that data to all frontier labs,” Bain added in a statement.
Micro1’s revenue growth has been steep but still trails larger rivals such as Mercor ($450M ARR) and Surge ($1.2B in 2024). Still, its approach of sourcing domain experts—engineers, doctors, writers, and academics—rather than low-cost general contractors sets it apart.
The company’s in-house AI recruiter, Zara, screens and interviews applicants, helping Micro1 scale a workforce of thousands of vetted professionals, including professors from Stanford and Harvard. New experts are being added weekly.
Beyond data labeling, Micro1 is preparing to expand into “environments,” or simulated digital workspaces where AI agents can train on complex tasks. This reflects a wider shift in the AI ecosystem, as labs increasingly seek diverse and high-quality data sources.
The market remains large enough for multiple providers, as no single company can meet the full scope of an AI lab’s data needs. For Micro1, the combination of fresh capital, strong demand, and rapid scaling places it in a promising position to grow further.