Wikipedia
Fidessa
Fidessa Group plc is a British-headquartered company which provides software and services such as trading systems to clients in the financial services sector. The firm also provides market data and related services to buy side and sell side financial services customers.
The company is headquartered in Woking with offices in London, New York, Chicago, Boston, Tokyo, Hong Kong, Paris, Toronto, San Francisco, Belfast, Singapore, Bahrain, Sydney and São Paulo. It is listed on the London Stock Exchange and is a member of the FTSE 250 Index.