Yesterday MailChimp, a company that sells a product that lets users send emails programmatically, sold to Intuit for $12B. That's a large exit by any standards, but MailChimp also made history differently. MailChimp is completely bootstrapped. It has never taken VC funding since it was started back in 2001. Each of the cofounders owns 50% of the company. The employees don't own any equity. That makes it the largest acquisition of a privately-held bootstrapped private company ever.