Anthropic is SpaceX's largest customer — 34.5% of the Q3 10-Q's $14.6B quarter

Open · 1 update · since Oct 29, 2026 · updated Oct 29, 2026 Space spacex anthropic

Where it stands: SpaceX's mystery "Customer B" is Anthropic, which accounted for 34.5% of the company's $14.6 billion in Q3 2026 revenue and became its largest customer. That quarter's revenue was up 161% from 2025, with Starlink up 69.5% and AI revenue from renting compute to AI labs quintupling from the previous quarter. Watch how much Anthropic spends in Q4 and how large those compute-rental contracts turn out to be.

Latest

• 2026-10-29
  (~4:20 PM ET, ShiftDelete citing Bloomberg — en.shiftdelete.net): the SpaceX 10-Q's mystery "Customer B" is Anthropic — behind 34.5% of Q3 2026 revenue, making the AI lab SpaceX's largest customer. Same-day financial read (Morningstar, morningstar.com.au/stocks): Q3 revenue of $14.6 billion, up 161% since 2025, Starlink revenue up 69.5%, and AI revenue quintupling sequentially on "neocloud rentals" of compute to AI labs — the driver Morningstar cites in raising its fair-value estimate. Watch: Customer B's spend into Q4, the neocloud-rental contracts' size, independent identification of the customer from the filing, and the AI/data-center revenue build beside the orbital-data-center and Terafab storylines.