The 17% Customer Who Didn't Exist Two Years AgoThin moat

Micron Technology (MU) — moat facet

Micron's largest relationship went from zero to a sixth of revenue in two years, and moved from phones and cars into the AI data centre.

Micron's Note 28 records a transformation in three sentences. No customer accounted for 10% or more of total revenue in 2023. One customer was 10% in 2024, primarily across the mobile, automotive and cloud segments. One customer was 17% in 2025, primarily in the Cloud Memory Business Unit1.

One relationship, three years2023no customer at 10% of revenue2024one at 10% — mobile, automotive, cloud2025one at 17% — primarily Cloud MemoryWhat changedcomposition as well as sizeWhat it now trackshyperscaler capital budgetsMicron names no customer. The segment shift is what the filing discloses.
Not one relationship growing steadily — a different kind of customer arriving.

Read carefully, that is not one relationship growing steadily. The 2024 customer was spread across phones, cars and cloud — the profile of a large diversified electronics buyer. The 2025 customer sits primarily in the segment that sells high-bandwidth memory to data centre accelerator makers. The composition of Micron's largest relationship changed at the same time as its size.

Micron does not name the customer, and this collection will not assert an identity the filing withholds. What matters commercially is the character of the demand: a buyer of HBM for AI accelerators orders against a capital spending cycle set by a handful of hyperscalers, which is faster-growing, higher-margin and much less predictable than the consumer electronics cycles Micron built its business around.

Watch this percentage in each annual filing. A relationship that went from zero to 17% in two years has no established equilibrium, and the same mechanism that produced the rise can reverse it — memory buyers adjust orders far faster than they adjust roadmaps.

Moat trajectory: Narrowing

Zero, then 10%, then 17% — and the composition changed from a diversified electronics buyer to a cloud-segment relationship. A dependency that has no established equilibrium and was created by a capital-spending cycle Micron does not control. Rising further would deepen a concentration Micron has never carried before.

The number that tests this moat
Moat Explorer calc
Cloud Memory share of revenue
33% in fiscal Q3 2026 ($13.8B of $41.5B)

Micron's largest customer sits mainly in this unit. Its share of revenue rising means Micron depends more on a few hyperscalers' budgets.

How it's calculated: Cloud Memory Business Unit revenue ($13,769M) ÷ total revenue ($41,456M), fiscal Q3 2026.
Source: Micron fiscal Q3 2026 results ↗
References
  1. ReportedRevenue from one customer was 17% in 2025 (primarily CMBU) and 10% in 2024 (MCBU, AEBU and CMBU); no customer reached 10% in 2023.
    Micron Form 10-K, FY2025 (Note 28, Certain Concentrations) — revenue from one customer was 17% of total revenue for 2025, primarily included in the Cloud Memory Business Unit segment; revenue from one customer was 10% of total revenue for 2024, primarily included in the MCBU, AEBU and CMBU segments; no customer accounted for 10% or more of total revenue in 2023; in each of the last three years approximately one-half of total revenue was from the top ten customers, and in 2025 over half; approximately one-half of total revenue was concentrated in the data center end market; increases in sales of system solutions may increase dependency upon specific customers because products with specifications unique to a customer increase reliance on that customer — FY2025 (ended August 28, 2025) · publ. October 3, 2025 · source ↗
Sources
Generated September 23, 2026