The AI training data and reinforcement learning (RL) environment sector is valued at approximately $100B, with Scale AI ($29B valuation), Surge AI ($25B), Mercor ($10B–$20B), and Handshake ($3.5B) representing over 75% of the market. Other notable private players include micro1 ($2.5B), Turing ($2.2B), Arena ($1.7B), and Snorkel AI ($1.3B). The industry generates roughly $8.5B in total revenue, with Surge AI leading at a ~$3B run rate followed by Mercor at $2B+.