Fastly (FSLY) concentration risks

The company's disclosed concentration profile is relatively diffuse by edge computing and CDN sector standards, with a medium-share aggregate top-customer exposure and a small-share named single-entity dependency layered beneath it. The ten largest customers generated an aggregate of 32% of revenue in the trailing twelve months ended December 31, 2025 — a medium share by disclosed size and a dependency character. For a content delivery and edge cloud platform, this level of customer concentration is lower than many peers in the sector, reflecting a customer base spread across media, e-commerce, software, and enterprise verticals rather than dominated by a single industry. The dependency character means individual customer spending decisions — driven by their own traffic levels, vendor consolidation choices, or in-house build versus buy decisions — can affect revenue in ways that are not always visible in advance. Within that top-ten share, affiliated customers that are business units of a single company generated 10% of revenue for the year ended December 31, 2025 — a small share by disclosed size but a more idiosyncratic dependency, since these are business units of one parent entity. Any strategic decision by that parent to reduce usage, consolidate vendors, or shift delivery infrastructure in-house would affect the full 10% simultaneously rather than as separate customer decisions. Together, the disclosures suggest a manageable overall customer concentration profile, with the single-entity affiliated exposure at 10% representing the primary named idiosyncratic variable to monitor.

For the engine’s reasoning on FSLY’s current verdict — including which dimensions drove the score — see the per-dimension breakdown.

Concentration counts reflect items disclosed in each peer’s most recent 10-K; disclosed-size classification uses TrendMatrix’s internal 10-K extraction taxonomy.