He waited nearly 20 years to start a company. Now he's the cofounder of a double unicorn.

Snehal Antani became a cofounder in his late 30s. His AI hacking startup, Horizon3, now has a market value above $2 billion. Courtesy of Horizon3 Horizon3 CEO Snehal Antani spent two decades building the skills he believed he'd need to be a founder. Antani said that experience helped the startup survive a funding crunch and the collapse of Silicon Valley Bank. There was one skill, though, he hadn't learned and got a crash course in: fundraising. Earlier this month, the AI hacking startup Horizon3 achieved a rare milestone: a $250 million funding round pushed its market valuation above $2 billion, making it a so-called double unicorn. CEO Snehal Antani said he spent nearly two decades acquiring the skills he needed to build the business, which simulates cyberattacks on companies' systems to identify vulnerabilities before real hackers can exploit them.