Investors and retail traders from across the US and around the world were glued to their screens on Friday as Elon Musk’s SpaceX started trading in the stock market after the biggest initial public offering in Wall Street history.

SpaceX had the largest stock-market debut in history when it went public on June 12. The company raised $75 billion in the initial public offering and ended its first day on the public markets with a market capitalization of around $2.2 trillion. The IPO turned SpaceX founder Elon Musk into the world’s first trillionaire.

The US Justice Department has closed an antitrust probe into Paramount Skydance Corp.’s$110 billion purchase of Warner Bros. Discovery Inc., saying the deal “is not likely” to hurt consumers or competition in the film and television industry.

SpaceX, which had already negotiated to pay razor-thin fees on its record initial public offering, somehow managed to get an even better deal out of its investment bankers.

In New York City, the heart of financial capitalism, there were plenty of signs of excitement about SpaceX’s IPO, which set off a feeding frenzy on Wall Street and turned Elon Musk into the world’s first trillionaire.

In a post on the social media platform he owns, Elon Musk recently lamented, “Whoever said ‘money can’t buy happiness’ really knew what they were talking about.”