No Customer Worth NamingWide moat

Microsoft (MSFT) — moat facet

Diffusion protects against losing any one customer, never against all of them spending less at once — the risk here was never departure, only slowdown.

Microsoft's revenue concentration disclosure is one of the least dramatic sentences in corporate filing: no sales to any individual customer, or to any country other than the United States, accounted for more than 10% of revenue in fiscal 2026, 2025 or 20241. Three consecutive years, no exceptions, nothing to elaborate.

The largest customer, as a share of revenue (%)10%Disclosure threshold7.3%OpenAI, FY2026belowEvery other customerForm 10-K FY2026 — $24.1B of $331.8B; no other customer is separately disclosed
Three years of an empty concentration table, and one counterparty now sits three points below the line at which it would stop being empty.

What sits behind it is the broadest enterprise customer base in technology. Microsoft sells to essentially every large organisation in the developed world and to a very large number of small ones — and it sells them several things at once, which is the more important point. A customer buying Office, Azure, security and developer tools on a single enterprise agreement is difficult to lose in a way that a customer buying one product is not, and the renewal is a negotiation about price rather than about whether to stay.

The qualification arrived this year, from a different disclosure entirely. Microsoft booked $24.1 billion from OpenAI in fiscal 20262 — 7.3% of revenue, which is to say the largest customer in the company's history is now within three points of the line it has spent three years reporting that nobody crosses. Nothing in the concentration sentence is untrue; it simply no longer implies what a reader would take from it.

The subtlety worth holding onto is that diffusion protects against losing any one customer, not against everyone spending less at once. Enterprise IT budgets move with the economy, and Microsoft's exposure is to the aggregate rather than to any individual account — with one exception, which it is now obliged to name.

Moat trajectory: Holding steady

Three consecutive years of the same disclosure, on the broadest enterprise base in technology, with customers buying several products on one agreement rather than one product each. Structural rather than dynamic — it would only change if enterprise IT itself consolidated, and the exposure has always been aggregate budgets rather than any single account.

The number that tests this moat
Reported
Customers above 10% of revenue
0, for a third year — the largest, OpenAI, reached 7.3%

The concentration table is empty and has been for three years, which is genuine diversification across millions of enterprise agreements. The qualification arrived this year: a single related party is now within three points of the disclosure threshold. If OpenAI crosses it, Microsoft's cleanest structural defence stops being clean.

Source: Microsoft Form 10-K, FY2026 ↗
References
  1. ReportedNo individual customer, or country other than the United States, accounted for more than 10% of revenue in fiscal 2026, 2025 or 2024.
    Microsoft Form 10-K, FY2026 — financial statements and notes: net income $133,749M, diluted EPS $17.95; segment revenue and operating income (Productivity and Business Processes $139,996M / $83,879M; Intelligent Cloud $137,791M / $56,972M; More Personal Computing $54,052M / $14,386M); revenue by product and service offering; additions to property and equipment $115,948M; net cash from operations $182,935M; unearned revenue $75,712M with $194,184M deferred and $185,737M recognised; revenue allocated to remaining performance obligations $684B, commercial $678B at a weighted average duration of about 2.3 years with approximately 30% expected within twelve months; contractual obligations $743,821M — FY2026 (ended June 30, 2026) · publ. July 29, 2026 · source ↗
  2. Moat Explorer calcMicrosoft booked $24.1 billion of revenue from OpenAI in fiscal 2026 — 7.3% of total revenue of $331,839M.
    Moat Explorer calculation from Microsoft Forms 10-K, FY2023-FY2026 — segment operating margin = segment operating income / segment revenue (Productivity and Business Processes $83,879M / $139,996M = 59.9% in FY2026 and $50,074M / $94,151M = 53.2% in FY2023; Intelligent Cloud $56,972M / $137,791M = 41.3%); free cash flow = net cash from operations less additions to property and equipment ($182,935M - $115,948M = $66,987M in FY2026; $118,548M - $44,477M = $74,071M in FY2024); capital spending as a share of operating cash flow (63% in FY2026, 38% in FY2024); Windows and Devices as a share of revenue ($17,084M / $331,839M = 5.1%); the near-term backlog = the disclosed percentage applied to the disclosed total ($205B of $684B in FY2026; $103B of $229B in FY2023); OpenAI's share of revenue = $24.1B / $331,839M = 7.3% — FY2023-FY2026 · publ. 2026 · source ↗
Sources
Generated September 22, 2026