Funding Probook Raises $40M from a16z and Sequoia to Build the Trades' AI Operating System Around Dispatch The home-services startup — serving HVAC, plumbing and electrical shops — raised a $6M seed led by Sequoia and a $34M Series A led by Andreessen Horowitz, a rare co-sign from two firms that seldom share a cap table. Founded by a 24-year-old who grew up pressure-washing houses, Probook is betting the trades' back office consolidates into one platform built around the dispatch board. Hugo Pegley · Jun 23, 2026
