Third Chair

Third Chair is an AI-native IP enforcement and licensing platform that helps rightsholders find who is using their content, trademarks, and likeness without permission and turn that unauthorized use into revenue. Backed by Y Combinator (X25) and FundersClub with $2.3M raised, it pairs AI agents that monitor, investigate, and draft demand letters with an on-demand network of lawyers. Customers - including Universal Music Group and much of the recorded-music industry - used the product to generate more than $1M in revenue in the last six months of 2025.