Definition
A founder who starts the company together with others.
Examples
He joined as a co-founder after building the first prototype.
Origin
Modern business/startup term; used as practical shorthand in product, growth, and investing.
Use it in Nautis
Track co-founder alongside everything else in your startup.
Nautis brings planning, fundraising, finance, and operations into one AI-native workspace — so concepts like co-founder stop being spreadsheet trivia and start showing up where decisions get made.