Cazeneuve’s office and office equipment firm has been fined £3.8m after being found to have failed to prevent a security breach that left staff exposed to radiation.
The firm was operating out of a property in Clapham in the city of London.
The company said it was cooperating fully with the investigation.
It had not disclosed the fine until Wednesday afternoon.
The company’s chairman, David Liddell, said the fine was the first of its kind in his company’s history and was not a result of a criminal conviction.
He said the breach had been fixed and the company had been fully cooperating with the police investigation.
The fine was for the theft of computers and mobile phones.
It was initially reported that Cazenesco was a client of the firm.
However, in an interview with the Irish Times, the firm’s chief executive, Martin Cazena, said his firm had no dealings with the company.
In a statement, the company said the fines were “an appropriate response to a serious and complex incident”.
In the statement, it said that, after a thorough investigation, it was “possible” that it had been “misrepresented” that Cazieneuve was a partner of Cazeniks office equipment business.
In response to questions about the company’s record, Cazenic said it had worked closely with the authorities on the matter.
“It is a matter of great regret that we were not able to prevent the breach of the equipment security of our offices in Clapton in the first place,” he said.
“The breach did not occur in the office of any of our employees and we have been working to improve our security and to increase our controls on our premises to protect our staff.”
The company was founded in 2008 and has offices in London, London, Dublin, Belfast, Birmingham and London.
It is one of the largest and oldest commercial equipment suppliers in the UK.
Cazenevez has been a director since 2014 and is the company president.
He has previously been chairman of the Cazienova Group, which owns a number of Irish power generation companies.