Substantive Research, BCG Expand, and TRG Screen report that 12 major market-data vendors notified clients of pricing changes effective 2027 that could raise existing seven-figure agreements by an average of up to 50%, partly tied to AI/LLM and agentic use. Initial vendor asks reached up to 300% before negotiation; separate AI surcharges in client deals ranged from 1 million. Industry market-data spend expected to rise ~7% in 2026; average teams manage 34% more vendors than four years ago.