You asked
How many legal entities (Companies) have a Four-Firm Concentration (CR4) ratio above 66% or with an Herfindahl-Hirschman Index (HHI) score of 1.666 exist in the UK, please show as a time series?
We said
Thank you for your Freedom of Information request.
We have conducted a search of our records, and unfortunately, we do not hold the information you require.
We may be able to create this information for you, or something similar, as a bespoke analysis. Any such analysis would be outside of the Freedom of Information regime and would be subject to legal frameworks, disclosure control, resources and agreement of costs where appropriate. For more information please contact; IDBRDAS@ons.gov.uk