Among those suspected of dealing with private investigators who broke the law:
- Five retailers
- Four legal firms
- Three insurance companies
- Two financial businesses
- One construction firm
- One security company
A further three private investigators were also included.
Information Commissioner Christopher Graham and his office were initially handed a list of 98 clients of corrupt private detectives by the Serious Organised Crime Agency (Soca).
Among them, 12 firms on the list were found to be no longer trading, while the Information Commissioner's Office (ICO) was awaiting further information on another 11.
More top news
Homeowners could be able to switch their mortgage for a better deal within seven days, under government plans to improve existing services.
From Wednesday "legal highs" are to be legal no more, with the Psychoactive Substances Act coming into force. But what does it all mean?
A think tank has asserted that most professional economists see leaving the UK as harmful to our prosperity.