Whitney Wolfe Herd ended the day Thursday with a net worth of $1.5 billion based on Bumble stock closing at $70.31.]

Shares of dating app Bumble soared in its IPO on Thursday, turning its 31-year-old CEO and founder Whitney Wolfe Herd into the world’s youngest self-made woman billionaire. Her nearly 12% stake in the company was worth $1.6 billion as of 12:40 p.m. EST on Thursday.

Bumble stock opened at $76, much higher than its initial IPO price of $43 per share. The company made its debut hours after the markets opened on Thursday.