The combined revenue share of the n largest customers: CR1, CR5, CR10.
The concentration ratio adds the shares of the top n customers. It is the form lenders, acquirers and auditors use, and it is blind to how revenue is divided inside the top n: one customer at 41 percent and nine at 1 percent is the same CR10 as ten at 5 percent. CR1 is always reported beside CR10 for that reason.
The revenue shares of the n largest customers added together, usually for n of 1, 5 and 10, from the ledger with subsidiaries rolled up to parents.
The largest customer is 12 percent of revenue, the top five 31 percent and the top ten 40 percent. A year ago they were 9, 27 and 38.
Top ten reported without the largest single share. One customer at 41 percent and nine at 1 percent looks the same as ten at 5 percent.