Design-software company Figma’s stock rocketed 250% above its initial public offering price, and was headed for the largest ever first-day gain, after an IPO had raised more than $500 million.

The price for design software developer Figma surged more than 250% on Thursday to close at over $117 per share after raising over $1.2 billion in an IPO, well over three times the $30-$32 range the company estimated in SEC filings earlier this week—making its 33-year-old CEO Dylan Field a billionaire.

Design startup Figma listed its shares on the New York Stock Exchange in a year when IPOs from buzzy tech firms have come roaring back.