Research

Studies built from what companies file with the SEC. Each one is dated, says how its numbers were made, and lists every figure it removed or corrected, so anyone can check it.

Oct 21, 2026Who lives off one customerCustomer concentration in 3,049 US-listed companies, from their latest annual reports. 267 get a quarter of their revenue or more from a single customer, 96 half or more, and most of them do not say who it is.1,236 disclosures checked against the filing · 164 corrected · Data free under CC BY 4.0