Financial research concept

Foundry Largest-Customer Revenue Concentration

Foundry largest-customer revenue concentration measures the percentage of revenue generated by the foundry's single largest customer.

By Lee BaileyPublished Sep 25, 2026

Research context

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Research date: Sep 25, 2026Use the dated article and cited sources for the definition, examples, and stated limitations.
Operating-model context: 19 connected conceptsPart of the reviewed Semiconductor Foundry Economics; issuer definitions remain distinct where disclosed.
Company examples: 1 reviewed companyRelationships reflect supported examples, not a normalized cross-company KPI ranking.

The largest customer became less dominant
Top-ten concentration moved the other way
Pair first-customer risk with second-customer risk
Part of the Semiconductor Foundry Economics
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Foundry largest-customer revenue concentration measures the percentage of revenue generated by the foundry's single largest customer.

TSMC's largest customer represented 19% of net revenue in 2025, down from 22% in 2024 and 25% in 2023.

The largest customer became less dominant

The decline from 25% to 19% is a six-percentage-point reduction in the largest customer's share over two years.

By itself, that looks like diversification. The broader customer table shows why that conclusion would be incomplete.

Top-ten concentration moved the other way

While the largest customer fell from 25% in 2023 to 19% in 2025, top-ten concentration rose from 70% to 78%.

Revenue therefore became less dependent on the single largest customer while becoming more concentrated across the top-ten group. Top-Ten Customer Revenue Concentration captures that second dimension.

Pair first-customer risk with second-customer risk

TSMC's second-largest customer reached 17% of 2025 revenue. The top two together represented 36%, so a falling number-one share did not eliminate large-customer exposure.

Read this metric with Second-Largest Customer Revenue Concentration, not in isolation.

Primary source: TSMC 2025 Form 20-F.

Part of the Semiconductor Foundry Economics

Connect end-market and process-node mix, customer concentration, manufacturing breadth, wafer capacity, utilization, shipments, pricing, and yield to understand pure-play semiconductor foundry economics.

Browse the full operating model in Company Analysis →

Where this concept fits

Customer concentration and manufacturing breadthCurrent relationship
Largest, second-largest, and top-ten customer concentration show dependence on major customers, while customer count, product count, and process-technology count show the breadth of the manufacturing ecosystem. Breadth does not negate concentration because a small number of customers can still drive most revenue.
Foundry Customer CountLargest-Customer Revenue ConcentrationCurrent conceptFoundry Process Technology Count Foundry Product Count Second-Largest-Customer Revenue Concentration Top-Ten Customer Revenue Concentration
Platform and process-node mix
HPC, smartphone, IoT, automotive, and digital-consumer-electronics revenue mix show where foundry demand originates. Advanced-technology wafer revenue mix and process-node revenue mix show which manufacturing generations monetize that demand without treating end-market categories as process nodes.
Advanced-Technology Wafer Revenue Mix Automotive Revenue Mix Digital Consumer Electronics Revenue Mix HPC Revenue Mix IoT Revenue Mix Smartphone Revenue Mix Process-Node Revenue Mix
Capacity, utilization, output, pricing, and yield
Annual 12-inch-equivalent capacity and wafer manufacturing capacity describe production scale, capacity utilization shows how much of that scale is being used, wafer shipments measure output, wafer average selling price measures realized pricing, and manufacturing yield indicates how effectively processed wafers become usable product.
Annual 12-Inch-Equivalent Wafer Capacity Foundry Capacity Utilization Semiconductor Manufacturing Yield Wafer Average Selling Price Wafer Manufacturing Capacity Wafer Shipments

See It in Company Research

These companies are examples of how the concept is reported or discussed in public filings. Definitions can differ by issuer; these links open company research rather than a normalized metric comparison.

TSMOpen operating-model research →19 of 19 reviewed concepts in Semiconductor Foundry EconomicsCustomer concentration and manufacturing breadth6 of 6 bridge concepts supportedContinue through this bridge:Foundry Customer Count Foundry Process Technology Count Foundry Product Count Second-Largest-Customer Revenue Concentration Top-Ten Customer Revenue Concentration

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Compare single-customer dependence with second-customer and top-ten concentration trends.

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