SpaceX's first public print answered the S-1's question: the AI segment that lost billions just turned positive — on $15.8B of quarterly capex

Every figure below traces to SpaceX's Q2 2026 earnings release, filed August 4, 2026 as Exhibit 99.1 to Form 8-K (accession 0001628280-26-052515), with S-1 baselines from accession 0001628280-26-036936. Research, not investment advice.

Our Monday preview made one argument about grading SpaceX ($SPCX)'s maiden public quarter: with no earnings history to anchor on, the S-1 was the only scoreboard, and the number that mattered most was the one everyone would be tempted to skip — the AI segment that the S-1 showed losing billions after the February xAI merger. The Q2 release, filed August 4, answered exactly that question.

The headline first. Revenue of $7.8 billion, up 92% year over year. Net loss narrowed to $541 million, from a $1.0 billion loss a year earlier. Adjusted EBITDA of $3.5 billion, up 191%. SpaceX ended the quarter with $100 billion in cash and marketable securities and a $47.5 billion backlog — the balance sheet the June IPO (638.9 million Class A shares, ~$85.7 billion net proceeds) and the $25 billion inaugural bond issuance were built to create.

The AI turn is the story. The segment the preview flagged reported revenue of $2.6 billion, up 247% year over year, cut its operating loss by 49% sequentially to $(1.26) billion, and — the line the S-1 could not have shown — delivered positive AI Adjusted EBITDA of $1.1 billion. A segment that was a pure cash drain in the prospectus generated positive segment-level cash economics in its first public quarter. The engine underneath: $14.1 billion of new Cloud Services Agreements signed in the quarter (contracted sales), of which $1.6 billion landed as incremental AI infrastructure revenue right away, plus Grok and X subscription growth. Compute capacity reached 1.4 GW, up from 0.4 GW a year ago.

The counterweight sits in the same table, and it is enormous: AI capital expenditure of $15.8 billion in a single quarter — more than twice the company's entire revenue — as SpaceX built out Colossus II and beyond. Total capex across all three segments was $18.4 billion for the quarter. The positive segment EBITDA is real; so is the fact that it is being bought with capital spending on a scale almost nothing else in the filings this season approaches. Management also announced an agreement to acquire Cursor for $60 billion, expected to close in Q3.

Starlink kept compounding. The Connectivity segment did $4.29 billion, up 66% year over year, with income from operations up 79% to $1.66 billion and segment Adjusted EBITDA up 64% to $2.6 billion. Subscribers doubled to 12.0 million, up 1.7 million sequentially, with new enterprise wins including American Airlines and Starlink Mobile carrier deals (SoftBank, NTT Docomo, Spark NZ). The one number to keep honest: ARPU fell to $66, from $85 a year ago — the subscriber base is growing faster than revenue per user, the classic consumer-broadband scale trade.

Space, the original business, is now the smallest segment. Launch and related revenue was $962 million, up 29%, on 38 launches and 485 metric tons to orbit, while the segment ran an operating loss of $542 million as R&D poured into Starship V3 (Flights 12 and 13 completed, the latter deploying 20 production V3 satellites). Starshield added over $6 billion in multi-year U.S. government contracts.

So the preview's question resolves cleanly: the AI segment was the one to watch, and it inflected — from the prospectus's biggest loss line to positive segment EBITDA — but the maiden print reframes the whole company as a capital allocation story. Three businesses at very different points on the curve (Starlink compounding at scale, AI inflecting on gigantic spend, Space absorbing Starship R&D), funded by a fortress balance sheet. The valuation page has the segment build and a DCF you can point at the assumption that actually decides the number: whether $15.8 billion of quarterly AI capex keeps producing $14 billion contract cohorts.

Every figure traces to accession 0001628280-26-052515 (sec.gov). Research, not investment advice.