Major ClientsNarrow moat

SpaceX (SPCX) — moat facet

SpaceX built its own biggest source of demand, which is why the rockets got cheap — and in 2026 two outside customers reached nearly two-fifths of revenue.

SpaceX did something unusual about customer concentration: rather than diversify, it built its own biggest source of demand. Starlink accounted for $11.4 billion of 2025 revenue — about 61% of the total — against $4.1 billion from the Space segment.1 Starlink's revenue comes from its own subscribers, but its satellites ride SpaceX rockets from SpaceX pads, and the company books no revenue between segments for those flights.2

Share of revenue, Q2 2026 (%)Customer A18.3%Customer B (AI)19.5%All other62.2%SpaceX Form 10-Q, concentration of risk
Two unnamed customers were nearly two-fifths of revenue in the June 2026 quarter; a year earlier only one passed 10%.

That structure resolves the problem the launch industry has always had. Rockets get cheap only through volume, and commercial demand alone never justified the cadence that makes reuse pay. Starlink supplied the demand internally, which is why SpaceX flies more than everyone else combined and why its costs fell far enough to make the constellation viable. Each half of the company is the other half's reason for working.

Outside it, the filings name no customers but do measure them. One customer, Customer A, buys from all three segments and was 25.2% of revenue in 2023, 24.2% in 2024 and 20.9% in 2025.3 In the June 2026 quarter it was 18.3%, and a second appeared: Customer B, buying only from the AI segment, at 19.5%, having been below 10% a year earlier.4 Customer A's reach across launch, broadband and AI is what a government's would look like, and Customer B arrived in the quarter SpaceX signed $14.1 billion of cloud-services agreements; SpaceX names neither, and these pages infer rather than assert.5 Behind them sit twelve million Starlink subscribers paying $66 a month on average, against $85 a year earlier.6

The number that tests the structure is the combined share of the two lettered customers, 37.8% in the June quarter.7 A vertically integrated source of demand is a wonderful thing while it grows; two outside customers at nearly two-fifths of revenue is a concentration SpaceX did not have a year ago.

Moat trajectory: Narrowing

Customer A fell from 25.2% of revenue in 2023 to 18.3% in the June 2026 quarter, but Customer B arrived at 19.5%, so two outside customers are now 37.8% of revenue. Starlink subscribers doubled; the concentration question moved to AI.

The number that tests this moat
Reported
Revenue from the two customers above 10%
Customer A 18.3% and Customer B 19.5% of Q2 2026 revenue; B is an AI customer that was below 10% a year earlier

Customer A buys from all three segments; B only from AI. Two customers at 38% of revenue is a new concentration, created by the cloud contracts, and worth watching quarter by quarter.

Source: SpaceX Form 10-Q, quarter ended 30 June 2026 ↗
Dig deeper
DIG DEEPER 01
Starlink: The Customer SpaceX Built for Itself
Sixty-one percent of revenue comes from a customer SpaceX owns; the circularity is exactly what made reusable launch economic.
DIG DEEPER 02
Twelve Million Subscribers, and What Each Is Worth
The subscriber base doubled while revenue per user fell by a third — Starlink is becoming a utility rather than a niche.
DIG DEEPER 03
One Government, Several Hats
NASA, the Space Force and the agencies are separate contracts drawing on one budget and one political weather system.
DIG DEEPER 04
The AI Customer at Nineteen Percent
The AI revenue turned out to be arm's-length rather than affiliated — and concentrated: one cloud customer was 19.5% of the whole company's revenue in…
References
  1. ReportedStarlink accounted for $11.4 billion of 2025 revenue — about 61% of the total — against $4.1 billion from the Space segment.
    SpaceX IPO prospectus (Form 424B4), segment note - revenue: Space $3,557M / $3,796M / $4,086M, Connectivity $3,869M / $7,599M / $11,387M, AI $2,961M / $2,620M / $3,201M, total $10,387M / $14,015M / $18,674M (2023-2025); segment income from operations Space $(1)M / $21M / $(657)M, Connectivity $469M / $2,006M / $4,423M, AI $(3,973)M / $(1,561)M / $(6,355)M; capital expenditures $4,415M / $11,163M / $20,737M; Starlink ARPU $99, $91, $81 — FY2023-FY2025 · publ. June 11, 2026 · source ↗
  2. ReportedStarlink's revenue comes from its own subscribers, but its satellites ride SpaceX rockets from SpaceX pads, and the company books no revenue between segments for those flights.
    SpaceX IPO prospectus (Form 424B4, 11 June 2026) - net income (loss) $(4,628)M, $791M and $(4,937)M for 2023-2025 (2024 aided by a $549M tax benefit and $985M of other income); mass to orbit 1,210, 1,699 and 2,213 metric tons (customer payloads 205, 282 and 312; internal 1,005, 1,418 and 1,901); launches 98, 138 and 170; Starlink subscribers 2.3M, 4.4M, 8.9M and 10.3M (March 2026); ARPU $99, $91, $81 and $66; NASA figures of $18,500 per kilogram historical average, about $2,700 for the first Falcon 9 (2010, about 85% less) and about $1,400 for the first Falcon Heavy (2018); Customer A 25.2%, 24.2% and 20.9% of revenue, across all three segments; backlog $27,621M at 31 March 2026; about 650 V1 Mobile satellites, about 30 MNO partners covering about 1.9 billion people; no inter-segment revenue on internal constellation deployments; Starship expected to begin payload delivery to orbit in 2H 2026, with next-generation V3 and V2 Mobile satellites dependent on it — FY2023-FY2025 and Q1 2026 · publ. June 11, 2026 · source ↗
  3. ReportedOne customer, Customer A, buys from all three segments and was 25.2% of revenue in 2023, 24.2% in 2024 and 20.9% in 2025.
    SpaceX IPO prospectus (Form 424B4, 11 June 2026) - net income (loss) $(4,628)M, $791M and $(4,937)M for 2023-2025 (2024 aided by a $549M tax benefit and $985M of other income); mass to orbit 1,210, 1,699 and 2,213 metric tons (customer payloads 205, 282 and 312; internal 1,005, 1,418 and 1,901); launches 98, 138 and 170; Starlink subscribers 2.3M, 4.4M, 8.9M and 10.3M (March 2026); ARPU $99, $91, $81 and $66; NASA figures of $18,500 per kilogram historical average, about $2,700 for the first Falcon 9 (2010, about 85% less) and about $1,400 for the first Falcon Heavy (2018); Customer A 25.2%, 24.2% and 20.9% of revenue, across all three segments; backlog $27,621M at 31 March 2026; about 650 V1 Mobile satellites, about 30 MNO partners covering about 1.9 billion people; no inter-segment revenue on internal constellation deployments; Starship expected to begin payload delivery to orbit in 2H 2026, with next-generation V3 and V2 Mobile satellites dependent on it — FY2023-FY2025 and Q1 2026 · publ. June 11, 2026 · source ↗
  4. ReportedIn the June 2026 quarter it was 18.3%, and a second appeared: Customer B, buying only from the AI segment, at 19.5%, having been below 10% a year earlier.
    SpaceX Form 10-Q, quarter ended 30 June 2026 - net loss $(541)M against $(1,008)M; Customer A 18.3% and Customer B 19.5% of revenue (Customer B below 10% a year earlier; Customer A across all three segments, Customer B in the AI segment); backlog $47,461M, about 56% within one year; Enterprise & Government revenue $1,806M including Starlink Mobile; related parties: $329M of Tesla Megapacks bought in the six months, Valor equipment-lease debt $2,039M current and $11,290M non-current, other transactions with Tesla and related parties immaterial — Q2 2026 · publ. August 4, 2026 · source ↗
  5. ReportedCustomer A's reach across launch, broadband and AI is what a government's would look like, and Customer B arrived in the quarter SpaceX signed $14.1 billion of cloud-services agreements; SpaceX names neither, and these pages infer rather than assert.
    SpaceX Q2 2026 results release (Form 8-K exhibit 99.1, 4 August 2026) - revenue $7,814M (+92%); Space $962M, Connectivity $4,291M, AI $2,561M (Q2 2025: $746M, $2,588M, $737M); net loss $541M against $1,008M; adjusted EBITDA $3.5B; AI segment adjusted EBITDA $1,146M against $(609)M in Q1, operating loss $1,257M; capex $18,369M ($15,828M AI; $2,825M a year earlier), $28,476M in the first half; nameplate compute 1.4 GW from 1.0 GW; cloud services agreements of $14.1B contracted sales adding $1.6B of AI infrastructure revenue; advertising $367M and AI solutions & infrastructure $2,194M (Q2 2025: $426M and $311M); Starlink subscribers 12.0M (+1.7M in the quarter, 6.0M a year earlier), ARPU $66 against $85; Connectivity revenue +66%; launches 38 against 46 and 78 in the half against 84; mass to orbit 485 t against 652 t; Starship Flight 12 (May) and Flight 13 (July, 20 production V3 satellites deployed); agreement to acquire Cursor for $60B; IPO net proceeds about $85.7B; $25B bond; $100B of cash and marketable securities; backlog $47.5B — Q2 2026 · publ. August 4, 2026 · source ↗
  6. ReportedBehind them sit twelve million Starlink subscribers paying $66 a month on average, against $85 a year earlier.
    SpaceX Q2 2026 results release (Form 8-K exhibit 99.1, 4 August 2026) - revenue $7,814M (+92%); Space $962M, Connectivity $4,291M, AI $2,561M (Q2 2025: $746M, $2,588M, $737M); net loss $541M against $1,008M; adjusted EBITDA $3.5B; AI segment adjusted EBITDA $1,146M against $(609)M in Q1, operating loss $1,257M; capex $18,369M ($15,828M AI; $2,825M a year earlier), $28,476M in the first half; nameplate compute 1.4 GW from 1.0 GW; cloud services agreements of $14.1B contracted sales adding $1.6B of AI infrastructure revenue; advertising $367M and AI solutions & infrastructure $2,194M (Q2 2025: $426M and $311M); Starlink subscribers 12.0M (+1.7M in the quarter, 6.0M a year earlier), ARPU $66 against $85; Connectivity revenue +66%; launches 38 against 46 and 78 in the half against 84; mass to orbit 485 t against 652 t; Starship Flight 12 (May) and Flight 13 (July, 20 production V3 satellites deployed); agreement to acquire Cursor for $60B; IPO net proceeds about $85.7B; $25B bond; $100B of cash and marketable securities; backlog $47.5B — Q2 2026 · publ. August 4, 2026 · source ↗
  7. Moat Explorer calcThe number that tests the structure is the combined share of the two lettered customers, 37.8% in the June quarter.
    Moat Explorer calculation from SpaceX's prospectus, Q2 2026 10-Q and results release: AI share of revenue $2,561M / $7,814M = 32.8% (Q2 2026) against $737M / $4,071M = 18.1% (Q2 2025); Customer A 18.3% + Customer B 19.5% = 37.8%; AI revenue growth 3.5 times — Q2 2025 to Q2 2026 · publ. 2026-09-23 · source ↗
Sources
Generated September 23, 2026