Alphabet's 2015 investment of $900 million in SpaceX could return approximately $120 billion after the aerospace company goes public this summer, according to recent IPO filings. The Google parent company's 7% equity stake in Elon Musk's rocket maker has already appreciated dramatically, with SpaceX doubling in value during 2025 alone. As SpaceX prepares for its initial public offering roadshow in early June, Alphabet shareholders are positioned to benefit from what analysts expect will be a blockbuster market debut .

How Has SpaceX's Valuation Grown So Quickly?

SpaceX's valuation trajectory has been remarkable. The company was valued at approximately $400 billion earlier in 2025, but a secondary share sale in December raised that figure to $800 billion, representing a 100% increase in just months. SpaceX has since merged with xAI, Elon Musk's artificial intelligence company, and the combined entity is targeting a $1.75 trillion IPO valuation. If that target holds, Alphabet's stake would be worth more than $120 billion, translating to a return of approximately 13,400% on its initial investment .

The company's rapid growth reflects investor confidence in its core business segments. SpaceX operates as both an aerospace manufacturer and satellite-internet service provider, with two flagship products driving its valuation. Starship is a fully reusable orbital rocket designed for interplanetary travel, while Starlink is a constellation of low-Earth orbit satellites providing high-speed internet access globally. These dual revenue streams have made SpaceX one of the most valuable private companies in the world .

Why Should Investors Care About Alphabet's SpaceX Stake?

For investors holding Alphabet stock, the SpaceX IPO represents more than just a single investment opportunity. The unrealized gains from Alphabet's equity stake already contributed $8 billion to the company's profit in the first quarter of 2025 alone. This means that even before SpaceX goes public, Alphabet shareholders are benefiting from the rocket company's appreciation. Once SpaceX begins trading publicly, the value of Alphabet's stake could increase further, providing an additional boost to shareholder returns .

Beyond the SpaceX windfall, Alphabet has compelling growth prospects that make it an attractive investment independent of its aerospace holdings. The company is investing aggressively in artificial intelligence products, with particularly strong momentum in its cloud computing business. Google Cloud revenue rose 48% in the fourth quarter of 2025, marking the third consecutive quarter of acceleration, driven by strong demand for its Gemini models and tensor processing units, or TPUs. TPUs are custom AI accelerators that serve as an alternative to Nvidia GPUs, and several major AI companies including OpenAI, Anthropic, and Meta Platforms have signed deals to use them .

What Are Alphabet's Other Growth Drivers Beyond SpaceX?

• Cloud Computing Expansion: Custom silicon accelerators are projected to gain market share, reaching 24% of total accelerator sales by 2030, up from approximately 12% today, according to Morgan Stanley analysts. This shift could significantly benefit Alphabet's TPU business.
• Autonomous Ridesharing Leadership: Alphabet's Waymo division is the market leader in autonomous ridesharing, with robotaxis providing public rides in 11 major U.S. metropolitan areas and testing in 20 additional cities including London and Tokyo.
• Projected Market Growth: Morgan Stanley analysts estimate Waymo will account for 34% of autonomous vehicle trips annually by 2032, positioning it 9 percentage points ahead of second-place Tesla in the robotaxi market.

Wall Street estimates Alphabet's earnings will increase at 15% annually through 2029, which analysts say makes the current valuation of 28 times earnings look reasonable. However, Alphabet has a track record of beating consensus estimates. The company beat the consensus earnings estimate by an average of 15% over the last six quarters, suggesting that Wall Street may be underestimating its growth potential .

The broader market opportunity for Alphabet's core businesses is substantial. Grand View Research estimates cloud spending will grow at 16% annually through 2033, while robotaxi revenue is projected to increase at 99% annually over the same period. These growth rates far exceed typical technology sector expansion, indicating that Alphabet is positioned in some of the fastest-growing segments of the tech industry .

As SpaceX moves toward its summer IPO, investors watching Alphabet should recognize that the company offers multiple paths to growth. The SpaceX stake provides a near-term catalyst, while cloud computing and autonomous driving offer longer-term appreciation potential. The combination of these factors, along with Alphabet's history of beating expectations, suggests the company may be undervalued at current levels relative to its growth prospects.