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Third Chair

Automating complex legal workflows with human lawyers in the loop.

Third Chair automates complex legal workflows at scale, supported by an on-demand network of top lawyers to step in when you need them. We’ve started with revenue-generating workflows like IP enforcement, giving media companies visibility into who’s using their content and helping them turn unauthorized ads into a predictable income stream. The biggest media and entertainment companies in the world rely on Third Chair to enforce their intellectual property, unlock licensing revenue, and accelerate deal flow.
Active Founders
Yoav Zimmerman
Yoav Zimmerman
Founder
Yoav is CEO / Founder of Third Chair (YC X25). Yoav previously founded Trendpop (YC W21) and scaled it past $1M ARR in the media/entertainment industry, selling to customers like Universal Music Group and Mr. Beast. Before that, he worked on machine learning at Google and early-stage AI startups.
Company Launches
Third Chair: Agents for in-house legal teams
See original launch post

TL;DR

Third Chair is building agents for in-house legal teams. We’ve started in media/entertainment, where our agents can identify IP infringements, collect evidence, and help recover millions of dollars in damages at scale.

🛑 Problem

In-house legal teams are constantly underwater with a million tasks on their desk. Many of these are repetitive, manual, and mind-numbing:

  • Our customer at a music distributor spent hours tracking down brand contacts, then weeks following up with different emails just to reach the right department.
  • Our customer at a major record label spent weeks reviewing thousands of social media ads and manually logging results in a spreadsheet.
  • Our customer at a music publisher spent a majority of his time on email follow-ups for unpaid invoices, unsigned contracts, and unanswered emails.
  • Our customer at a music rights investment firm didn’t have time to draft individual demand letters for thousands of infringements they wanted to pursue.

When you're buried in a million tasks, it can be hard to prioritize what matters most to your business's bottom line. At worst, you can miss opportunities that could turn the legal department from a cost center into a profit driver.

✅ Solution

That’s why we’re building Third Chair for in-house legal teams, starting in media/entertainment. Our customers delegate end-to-end workflows to Third Chair so they can operate at scale:

  • Our browser agent detects uses of your copyrights, trademarks, or name-image-likeness across the web.
  • Our outreach agent finds the right business contact, verifies deliverability, and sends follow-ups.
  • Our contracts agent drafts demand letters for human review, incorporating the context gathered in previous steps.

This is definitely the best product I’ve seen in this category. Every other vendor just sends us CSV data files from outsourced data labelers. - Top 3 Music Company

Third Chair Product Demo

💡 We’ve found that in-house legal teams don’t want to learn and buy new software tools, but they’re happy to buy services to solve their problems. That’s why you can work with Third Chair just like you would with a human paralegal. You can send questions or tasks via email to ask@usethirdchair.com, or use our web interface for more complex workflows.

AI will create the first one-person unicorn. Third Chair will be their legal department.

🤝 Team

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Yoav previously founded Trendpop (YC W21) and scaled it to $1M ARR in the media/entertainment industry. Before that, he worked on machine learning at Google and AI startups.

Shourya previously founded Fello (YC W22), an investment platform with over a million users and several million in annual investments. Before that, he worked at BlackRock building financial solutions for large institutional clients.

🎯 Ask

We’re looking to meet anybody in legal/business affairs at a media/entertainment company, such as music, film, sports, or talent. If you have any friends in these departments that are drowning in work, give us a shout!

Email us at founders@usethirdchair.com.

Check out more at https://usethirdchair.com.

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YC Photos
Jobs at Third Chair
IN / Remote (IN)
₹2.8M - ₹5.5M INR
0.05% - 0.20%
3+ years
Third Chair
Founded:2024
Batch:Spring 2025
Team Size:8
Status:
Active
Location:San Francisco
Primary Partner:David Lieb