Bumble's 31-year-old Founder and CEO Whitney Wolfe Herd has become a self-made billionaire with Bumble Inc's IPO that valued her stake at $900 million, taking her overall wealth above $1 billion. Bumble raised $2.15 billion in IPO priced at $43 per share to sell 50 million shares. She's also the youngest female CEO to take a big US firm public.