Katrina Lake founded Stitch Fix, the online personal shopping service, out of her apartment on the back of a failed startup idea. Today, according to Forbes, Lake, now 34, has a 16.6% ownership in the company, which went public a month ago. And her net worth now approaching $500 million—making her one of the youngest, richest self-made women in America. “If Lake makes the next iteration of the Richest Self-Made Women list, she’ll likely be one of the youngest women to do so,” Forbes says.