Dealogic is best known for supplying trading software for share and bond dealings but it also provides realms of data on equity transactions, mergers, acquisitions and floats in the Square Mile. The business, previously known as Computasoft, was set up 21 years ago with just £30,000 but now has 300 offices in New York, London and Hong Kong. Profits last year came in at £12m on sales of £28m.