Andrew Bialecki is preparing to take Boston startup Klaviyo public eleven years after founding it. Bialecki, who cofounded the marketing tech company in 2012, owns more than a third of Klaviyo, according to the company's recent S-1 filing. In the last eleven years, the 37-year-old has quietly built the hottest Boston startup you've never heard of. For comparison, HubSpot's Brian Halligan and Toast's Chris Comparato reported salaries of roughly $240,000 before taking their Boston startups public. Bialecki has also sold few shares of Klaviyo in inside rounds, according to two people familiar with the company's financials.

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Persons: Andrew Bialecki, Jason Lemkin, Peter Walker, Klaviyo, Yankee frugality, Barry Chin, Ed Hallen, Hallen, Bialecki, Alexa von, TJ Mahony, he's, Elias Torres, Bootstrapping, Jon Karlen, Karlen, Mahony, Alex Clayton, frugality, HubSpot's Brian Halligan, Toast's Chris Comparato Organizations: Boston Globe, Getty, MIT's Sloan School of Management, Capital, Harvard University, Predictive Technologies, Fortune, Red Sox, Meritech Capital, Boston, Black, Patriots Locations: Boston, Coast, Bialecki, Washington, DC, Klaviyo, Braze, Miami