Micro1 reaches $500M gross run rate amid AI training boom

A two-year-old startup most people have never heard of is quietly becoming one of the fastest-growing companies in the AI supply chain. Micro1, a Palo Alto-based firm that supplies human-generated training data for AI models, has hit a $500 million gross run rate as demand for high-quality datasets continues to accelerate. The company’s trajectory reads like a growth chart someone accidentally tilted 80 degrees. Micro1 started 2025 with roughly $7 million in annual recurring revenue. By December, that figure had ballooned to $100 million. If the company’s internal projections hold, ARR could land somewhere between $200 million and $300 million in 2026. From AI recruiter to data powerhouse Micro1 didn’t start out in the training data business. Founded in 2022 by UC Berkeley alumnus Ali Ansari, the company originally operated as an AI-powered recruiting tool called Zara. The pivot to data services turned out to be one of those rare strategic redirections that actually works. The company now maintains networks of domain experts across fields like STEM, healthcare, law, and finance. These specialists generate the kind of nuanced, high-quality training data that AI researchers increasin...