Major customer disclosure requirements under U.S. GAAP kick in when a single outside buyer accounts for 10% or more of a company’s total revenue in a reporting period. That threshold comes from FASB’s Accounting Standards Codification 280, Segment Reporting, and it requires the company to disclose the concentration, the dollar amount involved, and which operating segments earned the revenue. Public companies carry an additional set of SEC obligations that can go further, including naming the customer in some cases.
The 10% Revenue Threshold
Under ASC 280-10-50-42, a customer becomes a “major customer” the moment its purchases hit 10% or more of consolidated revenue for the period. Total revenue here means all sales to outside parties across every operating segment; intercompany transactions drop out. The math is simple: revenue from the one buyer divided by total consolidated revenue. Ten percent or higher, and disclosure is on.
The test is annual. Entity-wide disclosures under ASC 280, which include the major customer disclosure, are not required in interim financial statements. Still, when a material shift happens mid-year — a new customer crossing the line, or a long-standing one falling off — SEC expectations generally push public companies to address it in quarterly filings rather than sit on the change until year-end.
Location and product line do not matter. A foreign buyer counts the same as a domestic one. A customer of one segment counts the same as a customer that buys across several. Only the percentage matters.
What Counts as a Single Customer
The standard defines “single customer” more broadly than most people expect, and the two expansions catch situations that would otherwise slip below the threshold.
Entities under common control are treated as one customer. If a parent and three of its subsidiaries each buy from you, you combine the four sets of purchases. You cannot split them into four separate accounts to stay under 10%.
Each level of government also counts as one customer. The entire U.S. federal government is one customer. Each state is one. Each local government, such as a county or city, is one. Each foreign government is one. For defense contractors and other companies with heavy public-sector work, this alone can push government revenue past the threshold even when the actual contracts are scattered across dozens of agencies.
What You Have to Disclose
Once a customer crosses 10%, three items must appear in the disclosure:
- the fact that revenue from a single external customer equals or exceeds 10% of total revenue;
- the total revenue amount earned from that customer during the period; and
- the identity of the operating segment or segments that reported the revenue.
If more than one customer independently clears 10%, each one gets its own disclosure. Combining two major customers into a single line would obscure the risk each relationship carries and is not allowed. The only aggregation the standard permits is the common-control combination described above.
What You Do Not Have to Disclose
ASC 280-10-50-42 explicitly says the company does not have to name the major customer. The buyer can stay anonymous in the footnotes as “Customer A” or simply “a single customer.” The standard also does not require breaking out how much of the major customer’s revenue each segment earned. Naming the segments involved is required; the per-segment dollar split is not.
Where the Disclosure Appears
Major customer information usually sits in the footnotes to the financial statements, inside the note on segment reporting. It can be written as a paragraph, presented as a table, or both. A typical version is a short paragraph stating the percentage and dollar amount of revenue from the customer along with the reporting segments involved. When there are multiple major customers, each gets its own line or paragraph.
Who These Rules Apply To
The major customer disclosure requirements in ASC 280 apply only to public entities. Private companies are not required to provide them, though FASB encourages voluntary disclosure. Private companies often deal with the underlying question anyway during acquisition due diligence or when lenders assess commercial credit, since buyers and creditors will ask about customer concentration regardless of what the accounting rules demand.
Single-segment public companies are not exempt. The entity-wide disclosures under ASC 280, including this one, apply to every public entity no matter how many segments it reports. “We only have one segment, so segment reporting doesn’t apply to us” is wrong on this point.
Extra Requirements for SEC-Reporting Companies
Public companies carry a second layer of obligations on top of the GAAP footnote. The SEC’s Regulation S-K governs the substance of registration statements and periodic reports, and it addresses customer concentration on its own terms.
Naming the Customer
Regulation S-K Item 101(c) requires registrants to describe “any dependence on revenue-generating activities, key products, services, product families or customers, including governmental customers.” Smaller reporting companies get a more direct version at Item 101(h)(4)(vi), which specifically calls for disclosure of “dependence on one or a few major customers.”1eCFR. 17 CFR 229.101 – (Item 101) Description of Business
Where ASC 280 permits anonymity, the SEC often pushes harder. The federal securities law materiality standard can require naming the customer when a reasonable investor would consider that identity important to an investment decision. This typically surfaces in the description of business or in Management’s Discussion and Analysis. SEC staff comment letters have flagged registrants for leaving customers unnamed when the concentration was severe enough that anonymity kept investors from assessing the risk.
Risk Factors
Public companies must also cover customer concentration in the Risk Factors section of Form 10-K and Form 10-Q when the dependence is material. This disclosure is forward-looking rather than historical. It should explain what happens to revenue and profitability if the major customer cuts orders, pushes back on pricing, or leaves. Boilerplate does not satisfy the requirement. The SEC expects language specific enough to let an investor gauge the size of the risk.
When a Major Contract Ends Early
If a material customer contract terminates outside its normal expiration, the company likely has a current reporting obligation under Form 8-K Item 1.02, which covers termination of a material definitive agreement. The filing must describe the date of termination, the parties, the material terms of the agreement, the circumstances of the termination, and any early termination penalties. The company has four business days from the event to file.2U.S. Securities and Exchange Commission. Form 8-K – Current Report
Item 1.02 applies only when the termination happens outside the agreement’s normal expiration and not because both sides fully performed. A contract that simply reaches its scheduled end date does not trigger a filing. A major customer walking away mid-contract, or either side terminating early, almost certainly does.
Consequences of Getting It Wrong
For public companies, missing a major customer disclosure carries real enforcement risk. The SEC can suspend trading, issue stop orders, and bring enforcement actions against companies that file materially deficient periodic reports.3U.S. Securities and Exchange Commission. Enforcement and Litigation In successful cases, courts can order disgorgement, with recovered funds distributed to harmed investors.
The more common consequence is an SEC comment letter. Staff reviewers flag missing or insufficient major customer disclosures, the company has to respond publicly, and the exchange lands on EDGAR as part of the record. Repeated failures or serious omissions can escalate to formal proceedings.
Litigation risk sits behind the SEC risk. Shareholder suits routinely cite omitted customer concentration as evidence that a company misled investors about the stability of its revenue, particularly after a stock price drop tied to a major customer’s departure.
Effect of the 2023 Segment Reporting Update
FASB issued ASU 2023-07 in late 2023, updating segment reporting for the first time in years. It added new requirements around significant segment expenses and the role of the chief operating decision maker. It did not change the major customer disclosure rules. The entity-wide disclosures under ASC 280, including the 10% major customer threshold, remain intact. Companies adopting the new standard for fiscal years beginning after December 15, 2023, should not expect any difference in how they identify or report major customers.