Sources: AI training data startup Micro1 raised $100M+ at a $4B valuation, up from $500M in September 2025 (Anna Tong/Forbes)
At the beginning of last year, Ali Ansari's company, Micro1, was a recruiting business with $7 million in ARR. It's now generating over $500 million in ARR and two xAI cofounders invested its latest round.
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