The brief is believed to be worth around £250,000 (PRWeek, 17 March).
FD was one of four agencies that pitched. It replaces five-year incumbent C&W, which declined to repitch. FD managing director Tarquin Henderson said: 'It is a commercially focused brief but our boardroom comms heritage helped us win it.'
Henderson said FD's work would involve research into financial services, telecoms and governance.
Thompson said Unisys had a strong heritage in the security sector but needed to extend its message to other markets.
This week the company won a two-year £2.7m account to oversee Malaysia's MyKad smartcard project. The programme involves the issuing of ID cards to all Malaysians aged 12 or over.
Unisys is jockeying with more than a dozen US IT firms for involvement in the UK's proposed biometric national ID card scheme.
The company, which will not use FD for financial comms, and does not have a financial agency, is listed in New York.