Why it matters
The larger the share of a few clients, the harder one loss hits you. It also determines your negotiating position: if you depend on one client, you give in more easily on rates.
Where it goes wrong
A group with several operating companies appears as separate clients in your accounting. Then concentration looks lower than it is. Merge them at the level where decisions are made.
How Dashly calculates it
Dashly calculates it per quarter from your accounting, with clients merged. The long tail, the share of revenue outside the top 10, sits next to it.