At the time of Big Bang, NMW Computers Plc, where ACT Group Plc now has 25%, and Quotient Plc, which it already owns, each claimed to have about 50% of the third party stock exchange settlement business, so that if ACT moved for NMW – and no-one takes the just an investment disclaimer very seriously – ACT would become overwhelmingly dominant in the City of London financial software and services market.
