SpaceX's First Week: The Biggest IPO in History Ends Up 37%

The most anticipated stock debut in years is in the books, and the numbers are staggering. SpaceX (ticker SPCX) wrapped its first week as a public company up about 37% from its $135 IPO price, capping the largest initial public offering ever and turning Elon Musk into the world's first trillionaire on paper. For retail investors who watched from the sidelines, the question now is whether the rocket has more fuel, or whether gravity is about to kick in.
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​A Record-Shattering Debut
​SpaceX raised roughly $75 billion in its offering, the biggest IPO in history, and listed on the Nasdaq. The stock jumped about 19% on its first day to close near $161, and the company's market capitalization reached around $2.4 trillion, instantly making it one of the largest companies in the world. Demand was enormous, with investors clamoring for a piece of a business that stayed private for over two decades.
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​Why Investors Are Obsessed
​SpaceX isn't just a rocket company. It combines a dominant launch business, the fast-growing Starlink satellite internet network, and an ambitious long-term vision that includes Mars. That mix of recurring revenue and moonshot optionality is exactly what growth investors love, and it's why the stock commanded a premium valuation from day one.
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​The First Cracks
​Records don't move in a straight line. By the middle of the first week, the stock posted its first decline since the debut, slipping over two sessions as early enthusiasm cooled. That's normal for a hot IPO: initial scarcity and hype fade, lockup dynamics loom, and the market starts asking harder questions about valuation. A pullback after a 37% run isn't a red flag by itself.
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​The Valuation Question
​A $2.4 trillion market cap is a lot to grow into. At that size, SpaceX is being valued on years of future Starlink expansion and launch dominance, not just today's results. For investors, the key risk is simple: when expectations are this high, even strong execution can disappoint a market that has already priced in perfection.
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​What Retail Investors Should Keep in Mind
​Newly public stocks are notoriously volatile, and chasing a name after a huge first-week pop has historically been a risky game. The early trading period can swing on sentiment more than fundamentals, and lockup expirations down the road can add selling pressure. Patience often beats fear of missing out, especially with a stock this widely owned and this widely discussed.
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​The Bottom Line
​SpaceX's debut is a real milestone, both for markets and for the company. But a historic IPO and a great long-term story don't erase the risks of a sky-high valuation and post-IPO volatility. The smart move is to understand what you would actually be buying, and at what price, before the headlines pull you in.
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​This article is for informational and educational purposes only and does not constitute investment advice. Newly public stocks can be especially volatile. Always do your own research and consult a qualified financial professional before making investment decisions.