AI is SpaceX's biggest business by sales, not by profit
In the three months to September 30, 2026, SpaceX brought in $14.58 billion of revenue. Its AI segment, which the company now calls Super Intelligence, accounted for $7.56 billion of it. Connectivity, the segment that holds Starlink, the satellite internet service, brought in $5.25 billion. The filings do not give a figure for Starlink on its own, so the comparison is between the two segments. On sales, in this quarter, AI is the larger business.
Profit tells the story the other way round. Operating income is what a business keeps from its sales after paying the costs of running it, before interest and taxes. SpaceX made $2.79 billion of it in the quarter. Connectivity made $2.37 billion of that, about 85%. The AI segment made $431 million, and the rockets and launch business, the Space segment, lost $7 million.
So the idea that AI now tops Starlink is half right. In the quarter, AI brought in the most money and Starlink's segment kept most of the profit. The rest of this piece explains where the AI money comes from, what the filings leave unsaid about it, and why those two facts sit side by side.
The AI money comes from a mix of services, and mostly from one customer
The company splits the $7.56 billion in two. $538 million is advertising, almost all of it on X, the social network formerly called Twitter. The other $7.02 billion is what it calls solutions and infrastructure. That covers subscriptions to its Grok chatbot, to Cursor (a coding assistant it bought in August) and to X, plus fees from other developers who connect to its AI models and fees for data. It also covers cloud services, which means renting out the computing power in its data centres to other companies that build AI.
The cloud services are new. SpaceX says it began offering them in the second quarter of 2026, and it names new cloud agreements as a primary driver of the segment's growth, alongside the Cursor purchase and growth in its AI models and software. It does not report how much of the $7.02 billion came from cloud services, so the filings do not show whether rented computing power is most of the AI money.
One number shows how concentrated this money is. The quarterly report says a single customer, named only as Customer B, paid 34.5% of all SpaceX revenue in the quarter, and that all of it falls in the AI segment. That works out to about $5.0 billion, or roughly two-thirds of the AI segment's revenue. A year earlier the same customer paid less than 10% of the total. The filing does not name the customer, and it does not say what the customer buys : computing power, access to the models, or something else.
The filing does describe how cloud services are sold. They are billed as a fixed monthly fee, over contracts that typically run three years and that either side can end with 90 days' notice. That describes cloud contracts in general. The filing does not say whether Customer B's contract is one of them, so it does not show how easily this customer could leave. What it does show is that about two-thirds of the AI segment's revenue rests on a single customer whose purchases are not disclosed.
What SpaceX's ninefold jump in AI revenue does and does not include
A year earlier, in the third quarter of 2025, the same segment brought in $813 million, so revenue grew more than ninefold. Part of that was bought, not grown, and it helps to know which part.
SpaceX merged with xAI, the AI company behind Grok, in February 2026, and xAI already owned X. The filing describes these deals as common-control mergers, meaning the same person controlled the companies on both sides. The segment's year-ago figures include $454 million of advertising, which suggests X was already counted in the $813 million. The filings checked for this piece do not spell out how the 2025 figures were restated, so this reading rests on those figures rather than on an explicit statement. On that reading, the merger is not what drives the year-on-year jump.
Cursor is part of it. SpaceX completed the purchase on August 14, 2026, at an implied value of $60 billion, and Cursor added $608 million of revenue in the six weeks it was owned. That money came with the purchase. Taking it out leaves about $6.95 billion of AI segment revenue, still more than eight times the year before. That is simple subtraction, not a growth figure the company reports. The company names new cloud agreements as a primary driver of the rise, without saying how much of it they account for. Even without Cursor, solutions and infrastructure revenue nearly tripled from the previous quarter, from $2.19 billion to about $6.41 billion.
Why SpaceX's AI profit looks small next to its sales
The AI segment's $431 million of operating income comes after $1.2 billion of share-based compensation tied to the Cursor deal. The company attributes these share awards to service after the purchase, so they are in effect the cost of SpaceX shares given to keep Cursor's staff on board. No cash leaves the company, but the cost is real, because it spreads ownership across more shares.
The segment's costs are also heavy because the hardware wears out. In the quarter the AI segment booked $2.47 billion of depreciation and amortization, the accounting cost of computers and data centres losing value as they are used.
SpaceX also reports a measure it calls Segment Adjusted EBITDA, which leaves out depreciation, share-based compensation and some other costs. On that measure the AI segment made $4.95 billion. The company's filing calls this a non-GAAP measure, meaning it is not defined by the standard accounting rules, and says it should not be read in isolation. The gap between $431 million and $4.95 billion is mostly the costs that measure leaves out.
Starlink's segment has no such gap to close. Connectivity revenue grew 69% from a year earlier, and its operating income nearly doubled, to $2.37 billion. In this quarter, that is what carried SpaceX's profit.
SpaceX's AI spending runs far ahead of its AI revenue
Capital expenditure is money spent on long-lived things such as buildings, chips and machines, and it does not show up in operating costs all at once. SpaceX spent $19.6 billion of it in the quarter, and $16.4 billion went to the AI segment. That is more than twice the $7.56 billion the segment brought in over the same three months. Connectivity, by comparison, spent $1.5 billion.
Over the first nine months of 2026, AI capital spending was $40.0 billion, against $10.9 billion of AI segment revenue.
Each of the three numbers answers a different question. Revenue shows who is paying now, and about two-thirds of the AI share comes from one customer whose purchases the filing does not describe. Operating income shows what is left after running costs, mostly from Starlink's segment. Capital spending shows where the money is going, mostly into data centres, before the revenue that is meant to pay for them has arrived.
What one quarter of SpaceX's figures cannot tell you
These figures describe three months, and the cloud business behind much of the growth is about six months old. They cannot show whether the large customer keeps buying at this scale, what it is buying, whether new contracts replace or add to it, or whether the computing power now being built will find buyers.
One more number needs care. SpaceX reported net income of $4.4 billion, more than its $2.79 billion of operating income. The difference comes from items outside its day-to-day business, including a $390 million tax benefit. That is why this piece uses operating income to compare the segments.
This piece describes what SpaceX's filings for one quarter show. It is not a view on SpaceX shares or their price, and the figures say nothing on their own about what comes next.
