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Mojang maybe?

Winner here

Very hard to say because businesses have been bootstrapped for decades before the term even existed.

I think it may be indeed.. apparently sold for between $750-$1 billion.

I think AdultFriendFinder was a big one, back in mid 2000's. Funny enough owned by a Christian dude.

Cargill

Cargill is still owned by the family.

HP?

HP IPO was about $400 million in today's dollars.