Not Starship. Not Starlink. This Is the Part of SpaceX's Business That Could Lift It Into the $3 Trillion Club.

When people picture Space Exploration Technologies (NASDAQ: SPCX), the first things that likely come to their minds are its reusable Falcon rockets. What investors may not fully grasp is that SpaceX is building a three-headed machine across launch, satellite internet, and artificial intelligence (AI) computing.

Currently, SpaceX boasts a market capitalization of just under $2 trillion. The question I am wondering is whether the AI pillar can stretch that value toward $3 trillion without the broader story falling apart.

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The short answer to that question is yes, it's possible. But it's not guaranteed. SpaceX's path to a $3 trillion market cap would have to run through cash flow that thus far has come from just one side of the business, but that now has a second engine quietly warming up.

SpaceX today: What is paying the bills, and what is still burning cash?

The space business was SpaceX's original foundation. This segment specializes in launching rockets -- the Falcon 9 and Falcon Heavy -- that carry NASA crews and cargo, as well as private company payloads.

It's also pouring money into the development of its larger Starship launch vehicle. Through the first six months of the year, the space business generated $1.6 billion in revenue from 78 launches. This business is still losing money at the operating line, largely because Starship development is eating billions of dollars in research and development costs.

While Falcon flights are a mature, high-cadence product, most of the flights are carrying SpaceX's own payloads -- hauling more Starlink satellites into orbit -- rather than serving external customers.

Starlink is the only SpaceX segment that is consistently profitable at scale. Through June 30, it generated $7.5 billion in revenue, or roughly 60% of the company's total. This segment also produced $2.8 billion in operating income and $4.7 billion in adjusted earnings before interest, taxes, depreciation, and amortization (EBITDA).

As of the end of the second quarter, Starlink had 12 million subscribers -- twice as many as a year prior. While consumer broadband matters, Starlink is making a conscious effort to push into enterprise plans across the aviation, maritime, and government sectors.

Then there is AI. In 2025, this was the smallest of the company's three businesses, with about $3.2 billion in revenue, and had a sizable operating loss due to hefty capital expenditures. By the second quarter of 2026, the AI business had jumped to $3.4 billion in sales and flipped to positive adjusted EBITDA. This shift occurred because SpaceX stopped treating its giant compute cluster, known as Colossus, as a private lab for Grok and began renting out some of its cloud capacity.