There is no universal customer quota. Assess the real enterprise, investment and nonmarginality using actual commitments and credible operating evidence.
Explain concentration honestly
Do not invent additional customers to make the business appear diversified.
An E-2 review should produce a transaction map: treaty nationality, enterprise ownership, source of funds, method of transfer, current commitment, risk of loss, business plan, and investor control. Where a note is secured by the assets of the business being bought - its equipment, inventory, receivables or goodwill - that borrowed amount is not the investor's capital at risk, because the enterprise itself absorbs the loss on default. Describe the investor’s enterprise as a set of real commercial functions: product selection, branding, sales, inventory risk, customer obligations, quality control, and supplier management. The core showing stays the same: treaty citizenship, at least fifty percent treaty ownership, substantial capital genuinely committed and at risk, a real operating enterprise that is not marginal, and your genuine development and direction of it. The enterprise must be real and operating, producing goods or services, and it must be more than marginal, meaning capable of generating more than a minimal living for the investor and family, judged over roughly five years.