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
A British scientist says the age women may be able to conceive children could soon be significantly extended.
Simon Cowell admitted he was "so embarrassed" after his shirt burst open during an X Factor audition.
Following the promise of further powers for Scotland, David Cameron is now talking about a new deal for the other home nations.