Third Chair (YC X25)

What It Does

Third Chair (Y Combinator X25 batch) builds AI agents for in-house legal teams, with a focus on IP enforcement and rights-holder work. The product runs agentic workflows — browsing the web, collecting evidence, drafting letters — with human lawyers kept in the loop. The pitch is to turn legal workflows that previously took hundreds of hours into a faster, repeatable process tied to rights enforcement.

What We Found

The company was founded by two repeat founders, Yoav Zimmerman and Shourya (per LinkedIn and YC listings), both with prior YC startups. It is hiring IP enforcement and copyright counsel roles, consistent with its media/entertainment rights-enforcement positioning. The company has published growth and ARR claims on LinkedIn (e.g. early 0-to-$100k ARR figures); these are vendor self-reported and not independently verified.

Who It’s For

Aimed at in-house legal teams and rights holders, particularly in media and entertainment, that handle IP enforcement at volume. Early-stage — relevant to teams comfortable adopting a young vendor.

Company Info

• Founded: 2025 (YC X25 batch)
• Sector: Legal AI / IP enforcement
• Backing: Y Combinator (X25)

What We Haven’t Verified

• ARR and growth figures (vendor LinkedIn claims)
• Headquarters, headcount, and HQ location
• Pricing and named customers