SpaceX Shares Surge, Briefly Overtaking Microsoft in Market Cap

SpaceX shares popped about 12% on Tuesday, as Elon Musk's rocket builder continued its meteoric rise following a record-breaking IPO on Friday.

With the skyrocketing share price, SpaceX briefly overtook Microsoft in market cap, becoming the fourth-largest company by valuation in the U.S.

SpaceX's market cap touched $2.94 trillion in mid-morning trading, surpassing Microsoft's valuation of $2.93 trillion, before finishing the day lower at $2.65 trillion.

SpaceX also leapfrogged Amazon , which has a market cap of about $2.64 trillion. The stock has a higher bar to clear to pass Apple , the third-largest U.S. company, with a market value of nearly $4.4 trillion.

The move comes after SpaceX shares jumped 20% in their first full day of trading after a blockbuster debut. The historic IPO minted Musk as the world's first trillionaire.

SpaceX's stock has surged roughly 62% from its initial public offering price of $135 a share. That's more than Amazon gained in the past five years. The e-commerce giant's shares are up about 45% over that stretch.

Earlier on Tuesday, SpaceX announced it would acquire popular artificial intelligence coding startup Cursor for $60 billion. The deal, which is expected to close in the third quarter of this year, could help give SpaceX an edge against leading AI labs OpenAI and Anthropic, which also offer coding tools.

Musk, who serves as CEO of SpaceX, posted on X on Sunday that the company "might be able to reach approximately" $1 trillion revenue in 2030.

That would be a huge jump from the $18.7 billion in revenue it had in 2025. The company posted a $4.9 billion net loss in 2025, and it lost $4.28 billion in the first quarter of this year.

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Founded in 2002, SpaceX has become dominant in satellites through its Starlink service and reusable rockets.

In February, Musk merged the company with his AI startup xAI, after combining the latter with his social media platform X in 2025.

SpaceX's debut has raised questions over its sky-high valuation, despite the huge gains it's seen since listing.

CFRA on Friday initiated coverage of the stock with a sell rating and a 12-month price target of $115, which is a nearly 29% drop from Friday's closing price. CFRA said its view was "due to the company's extremely ambitious growth strategy, elevated valuation expectations, and significant capital intensity."

Speaking to CNBC's "Squawk Box Asia" on Monday, Steve Westly, founder and managing partner of The Westly Group and a former board member of Musk's Tesla , said that SpaceX will need to deliver results to bullish backers fast.

"Investors at SpaceX, I believe, will get pretty grumpy after three or four quarters if he doesn't meet some of the growth projections that they made in the S1," he said, referring to the SEC filing used by companies planning on going public.

Bullish market analysts point to a long-term time frame for returns on the stock.

"When you take a further step back, it's about this fourth industrial revolution, and investors are focused on where everything's heading, whether it's on ships, space, whether it comes to infrastructure, industrials," Dan Ives, global head of tech research at Wedbush Securities, told CNBC's "Europe Early Edition" on Tuesday.