SpaceX leapfrogs Amazon and briefly tops Microsoft by market capitalization after historic IPO pricing

SpaceX’s shares jumped after pricing its initial public offering at $135 per share on June 12, 2026, in what was described as the largest public offering in history. The company raised an initial $75 billion, a figure that alone helped frame the scale of attention around the debut and its early trading trajectory.

During the first wave of market activity tied to the IPO, SpaceX briefly surpassed Amazon and then, for a short period, overtook Microsoft in market capitalization rankings. In practical terms, market capitalization is the value of a company’s stock as measured by the share price multiplied by total shares outstanding, so even a brief move in share value can reorder the top positions.

The surge also reflected the market’s willingness to treat SpaceX not just as a launch provider, but as a broader platform business tied to satellite deployment, rockets, and long-term space infrastructure ambitions. Investors often price such companies differently from more traditional industrial peers, and the magnitude of SpaceX’s IPO revenue suggests strong demand for exposure to that theme.

SpaceX’s offering was structured as a major institutional event, with underwriters exercising options after the IPO pricing period. Those typical post-pricing steps can amplify early liquidity and the pace of share trading, which can in turn make short-lived ranking shifts more visible in real time.

Microsoft, meanwhile, remains one of the most heavily valued software and cloud franchises, with its market cap historically anchored by recurring cloud revenue and the pace of enterprise adoption. That makes the momentary change in the ranking notable, not because Microsoft fundamentals suddenly changed, but because newly public valuations can be more volatile during the first sessions.

The sector context is that U.S. equity markets have been increasingly sensitive to “platform” growth narratives, where investors weigh long-term addressable markets more heavily than near-term earnings. SpaceX’s debut came with the kind of headline-grabbing capital raise that tends to draw incremental attention from both institutional allocation desks and broader-market participants, increasing the odds of rapid repricing.

What is not fully clear from the reporting is the exact market-cap gap at the moment SpaceX topped Microsoft, and how long the ranking persisted. The available account also does not break out any company-specific guidance, financial forecasts, or changes to Microsoft’s reported performance around the time of the market move.

Investors and analysts will likely watch subsequent trading to see whether the IPO-driven repricing holds after the initial enthusiasm cools, and whether SpaceX’s valuation stays competitive against other mega-cap incumbents on a sustained basis rather than a fleeting ranking snapshot. For Microsoft, the practical takeaway is that large-cap status can be briefly challenged when a new entrant captures unusually concentrated investor demand, even without any immediate operational shift at the incumbent.