Co-Founder

Also called Cofounder

A person who starts a company with you, sharing the earliest risk, ownership, and work. Usually brings complementary skills, a builder alongside a seller.

Why it matters

The co-founder relationship is one of the biggest determinants of a startup's success or failure, more than the idea. Choosing the right partner, and agreeing on equity, roles, and vesting early, is among the most consequential decisions a founder makes.

For example

A technical founder who can build teams up with a commercial co-founder who can sell, each covering the other's blind spot.

Worth your time

How to Find a Technical Co-Founder Y Combinator · guide YC is the canonical authority on early-stage team formation, and this is its practical guidance on finding the partner who will make or break the company. Open ycombinator.com →

How to Find a Technical Co-Founder Y Combinator · video A concise, practical talk from a two-time founder on where and how to find the technical partner a startup lives or dies by. Watch on YouTube youtube.com →

How I Met My Co-Founder Apple Podcasts · podcast Frameworks are useful, but this show lets you hear how real founders actually met and chose the person they built with. Listen on Apple Podcasts podcasts.apple.com →

Related terms

Go deeper

See how founders actually handle this on Co-founders, team and legal, part of the Starting Up hub.

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