SpaceX sold shares to the public for the first time on June 12, 2026, raising $75 billion — more money than any company has ever raised in an initial public offering, or IPO. The company priced each share at $135, and by the end of the first day of trading on Nasdaq, the stock had climbed to around $161. That's a roughly 19% gain in a single session.

To put the scale in perspective: Saudi Aramco's IPO in 2019, the previous record holder, raised $25.6 billion. SpaceX just raised three times that amount.

By the market close on the first day, SpaceX's total value — what investors call its "market cap" — had reached approximately $2.1 trillion. That places the company among the largest in the world by valuation, alongside Apple, Microsoft, and Saudi Aramco. For context, that's larger than the annual GDP of all but a handful of countries.

What Is a Market Cap, and Why Does It Matter?

When a company sells shares to the public, the stock price multiplied by the total number of shares outstanding equals the company's market cap. It's the total amount investors are willing to pay for ownership of that business at that moment.

For SpaceX, the market cap is important because it affects which funds buy the stock. Large investment funds — pension funds, mutual funds, index funds — often track specific indexes. When a company becomes large enough, it gets added to these indexes, and suddenly millions of dollars flow automatically into the stock. That can lift the price further.

The Growth Numbers Behind the Valuation

SpaceX reported $18.7 billion in revenue in 2025, up from $14.1 billion in 2024. That's 33% growth in a single year — a significant jump, per Reuters.

Here's where valuation gets interesting. The IPO priced the company at roughly 95 times its annual revenue. For comparison, Nvidia — a chip company that has been one of the hottest stocks of the past two years — traded at 25 to 30 times revenue at its peak.

SpaceX is trading at a much higher multiple. That premium reflects what investors think the company will do in the future: expand its Starlink broadband service globally, launch more rockets for commercial and government customers, and secure defense contracts. Investors are paying today for growth they expect tomorrow.

The Thin Float Question

SpaceX sold 555.56 million shares in the IPO. But the company has many more shares outstanding. The shares sold to the public represent only about 4.2% of the total company.

That's important. When only a small slice of a giant company is available to buy and sell on the public market, prices can move sharply on even moderate trading activity. It's like a narrow hallway: a small crowd moving through it causes congestion, while a wide hallway absorbs the same crowd easily.

For SpaceX, this means price swings in the coming weeks could be exaggerated. A big institutional investor deciding to sell could move the stock noticeably. It also means bid-ask spreads — the gap between what a buyer wants to pay and what a seller wants to receive — will likely be wider than they are for household names like Apple or Microsoft.

The Dual Listing and Regulatory Hedging

SpaceX listed its shares on both the traditional Nasdaq and on Nasdaq Texas, a newer exchange that opened in 2025 and operates under Texas state law.

This split listing likely reflects SpaceX's relationship with federal regulators. The company needs approval from multiple government agencies for its launch operations, satellite business, and defense contracts. By listing on two exchanges, SpaceX may be reducing its concentration risk — spreading out its regulatory and operational exposure rather than putting all of it in one jurisdiction.

What the First-Day Pop Tells Us

A 19% jump on the first day of trading for a $75 billion offering is not routine. Most of the trading in such large IPOs comes from institutional investors — the funds that manage pension money, insurance reserves, and large endowments. Retail investors (ordinary people) trade in much smaller volumes.

The fact that the stock kept gaining on Monday — its first full trading day — suggests institutional demand remained strong. Whether that reflects genuine confidence in SpaceX's future, or whether it's partly an artifact of the thin public float creating artificial upward pressure, is genuinely difficult to say at this stage.

The growth numbers are solid. SpaceX did grow 33% year-over-year, and it operates in markets with genuine long-term demand — broadband, space launch, defense. But the valuation multiples mean investors are betting the company will sustain that growth rate for years, expand profit margins along the way, and unlock new revenue streams. That's possible. It's also not guaranteed.

For now, the market is comfortable paying for that option. The real test comes when SpaceX reports its first results as a public company. Earnings calls and quarterly disclosures tend to separate genuine conviction from initial enthusiasm.