Elon Musk's space and AI conglomerate ended its third day of public trading worth roughly $2.65 trillion (€2.28tn), having displaced Amazon in the global market-capitalisation rankings.
The stock settled at $201.8 per share, in a debut week that has rewritten the upper reaches of the world's equity leaderboard at remarkable speed.
The milestone caps an already extraordinary stretch for the company, which listed on the Nasdaq under the ticker SPCX only last Friday.
SpaceX priced 555.6 million Class A shares at $135 each, raising around $75 billion (€65bn) in what was the largest initial public offering in history, comfortably eclipsing the $29.4 billion (€25.3bn) that Saudi Aramco raised in 2019.
The company also increased the total capital raised to $85.7 billion (€73.8bn) after underwriters exercised the "greenshoe" option to purchase additional shares on Monday due to exceptional demand.
At Tuesday's close, the stock was trading more than 50% above its IPO price.
During the trading session, share prices climbed as high as $225.6, briefly pushing SpaceX's valuation above $3 trillion (€2.58tn) and, for a moment, ahead of Microsoft as the world's fourth most valuable company.
The stock later pared those gains, closing below that threshold, but the intraday spike underscored the intensity of investor appetite for the listing.
Based on Tuesday's closing prices, only Nvidia ($5tr), Alphabet ($4.5tr), Apple ($4.4tr) and Microsoft ($2.9tr) had larger market capitalisations than SpaceX. Eight of the world's ten most valuable listed companies are tied to the technology and AI sector, a concentration that has defined markets throughout 2026.
The Cursor deal fuels the surge
Tuesday's advance coincided with a significant strategic move.
Before the opening bell, SpaceX announced an all-stock agreement to acquire Anysphere, the developer behind the AI coding assistant Cursor, in a deal valuing the startup at $60 billion (€51.7bn).
According to a regulatory filing, a SpaceX subsidiary will merge into Anysphere, leaving Cursor as a wholly owned arm of the group, with completion expected in the third quarter, subject to regulatory approval.
The purchase deepens SpaceX's push into enterprise AI, a market where rivals such as OpenAI and Anthropic have gained early commercial traction, and it follows the company's merger with Musk's xAI venture in February.
The acquisition stems from an option SpaceX secured in April, under which it agreed either to acquire Cursor for $60 billion (€51.7bn) later this year or pay $10 billion (€8.6bn) for a more limited partnership to access its computing technology.
However, despite all the positive news, the speed of the climb has drawn caution.
Sceptics argue that SpaceX remains overvalued, given that it has yet to turn a profit and only 3% to 4% of its total equity is publicly traded.
A fast-track route into major stock indices, which compels passive funds to buy the shares, is expected to further amplify demand for the limited supply of shares in the opening days of trading.
This article does not constitute financial advice, always do your own research and invest according to your specific circumstances.
