SpaceX shares opened at $150 on Friday, 11% above their $135 offering price, after the company completed the largest initial public offering in history.

The stock, which started trading on the Nasdaq Stock Exchange under the ticker symbol SPCX at around 11:46 a.m. E.T., jumped to a high of $175.50, a 30% increase from its IPO price, in early afternoon trading.

“Like most IPOs, the price jumped,” Jay Ritter, an IPO expert and professor at the University of Florida’s Warrington College of Business, told CBS News. “This is not a moonshot, but given the size of the deal, if the stock price holds, there will be more dollar value of [early stock returns] than any IPO in history.”

Ritter said the opening price was “disappointing relative to…