Late-blooming startups can still thrive

It seems like startup news is full of overnight success stories and sudden failures, like the scooter rental company that went from zero to a $300 million valuation in months or the blood-testing unicorn that went from billions to nearly naught.
But what about those other companies that mature more gradually? Is there such a thing as slow and successful in startup-land?
To contemplate that question, Crunchbase News set out to assemble a data set of top late-blooming startups. We looked at compan