A study by the company, which specialises in helping companies that have been hit by ransomware, malware that only attacks Windows systems, found that firms paid up because they feared public embarrassment, lost data and regulatory fines.
Worldwide, Emsisoft estimated that those using ransomware as a means of making money had pulled in an estimated £19 billion annually.
Emsisoft said British companies had suffered an estimates 5000 attacks in 2019 and paid about £210 million in ransoms, mostly in cryptocurrencies which are difficult to trace to an individual.
It is not illegal to pay a ransom in the UK unless it is connected to terrorism.
A recent ransomware attack on American cloud software company Blackbaud ended with the company paying a ransom. In the process, the data of 33 of its clients, including charity shop line Sue Ryder and the National trust, was compromised.
The Emsisoft report said Britain was sixth in the list of countries paying out ransoms, topped by France, Spain, Germany, Italy and the US in that order. America is said to have paid out US$1.3 billion in ransoms.