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Investor profile

Michael Seibel

Managing Director, Early Stage and Group Partner, Y Combinator

About

Michael Seibel is a former two-time founder who built Justin.tv/Twitch and Socialcam before becoming a Y Combinator partner, giving him firsthand experience with both hypergrowth and acquisitions that he draws on when advising founders. He's known for turning thousands of founder interactions into a structured playbook that emphasizes simple products and rapid iteration, while also being a consistent advocate for founders from nontraditional backgrounds who may not have Silicon Valley networks. Michael Seibel is a former two-time founder who built Justin.tv/Twitch and Socialcam before becoming a Y Combinator partner, giving him firsthand experience with both hypergrowth and acquisitions that he draws on when advising founders. He's known for turning thousands of founder interactions into a structured playbook that emphasizes simple products and rapid iteration, while also being a consistent advocate for founders from nontraditional backgrounds who may not have Silicon Valley networks.

Works at

Investment focus

Stages
Pre-Seed
Seed
Series A
Sectors
AI
SaaS
Devtools
Deeptech
Hardware
FinTech

Investment details

Avg check size$150K
Can lead rounds
No
Geographies
USA