List every meaningful revenue source and its dollar revenue for the year. Two readings come back: how spread out the whole book is, and how exposed you are to the single biggest source.
| Revenue source | Last 12 months | Share |
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Two different readings, two different sources. The index runs 0 to 10,000, where one source carrying everything scores 10,000. Its bands follow the 2023 Merger Guidelines as published by the DOJ: under 1,000 diversified, 1,000 to 1,800 moderately concentrated, above 1,800 highly concentrated. The single-largest-source zones, healthy at or under 10 percent, caution above 10 and up to 25, danger above 25, are RocketLevel working thresholds, the kind of line a buyer applies when pricing risk, not a figure from a published report. A book can sit inside the index bands and still fail on the largest single source, which is the reading that usually bites first.