- INFORMATION SYSTEMS ASSOCIATES LIMITEDDissolved- 02189829 - Dissolved on 30 December 2013 
- DASH INFORMATION SYSTEMS LIMITED- 03786567 - Incorporated on 10 June 1999 
- ORCHARD INFORMATION SYSTEMS LIMITED- 01900078 - Incorporated on 27 March 1985 
- LYNX INFORMATION SYSTEMS LIMITED- 02454130 - Incorporated on 20 December 1989 
- FERRET INFORMATION SYSTEMS LIMITED- 02126033 - Incorporated on 24 April 1987 
- THALES INFORMATION SYSTEMS LIMITED- 02937836 - Incorporated on 10 June 1994 
- QUEST INFORMATION SYSTEMS LIMITED- 02028133 - Incorporated on 13 June 1986 
- BUSINESS INFORMATION SYSTEMS LIMITEDDissolved- 02468291 - Dissolved on 27 March 2012 
- INFORMATION SYSTEMS PRACTITIONERS LIMITED- 02469647 - Incorporated on 13 February 1990 
- ADLIB INFORMATION SYSTEMS LIMITEDActive - Proposal to Strike off- 02559749 - Incorporated on 19 November 1990 
- INFORM INFORMATION SYSTEMS LIMITED- 02568442 - Incorporated on 13 December 1990 
- EXCELSIOR INFORMATION SYSTEMS LIMITED- 02620327 - Incorporated on 14 June 1991 
- MOBILE INFORMATION SYSTEMS LIMITED- 02986473 - Incorporated on 3 November 1994 
- BROOKLYN INFORMATION SYSTEMS LIMITEDDissolved- 03197634 - Dissolved on 26 October 2010 
- SHADOW INFORMATION SYSTEMS LIMITEDActive - Proposal to Strike off- 03247475 - Incorporated on 9 September 1996 
- TOR INFORMATION SYSTEMS LIMITEDDissolved- 03412940 - Dissolved on 19 June 2018 
- LINDEN INFORMATION SYSTEMS LIMITEDDisolved- 03530601 - Dissolved on 27 June 2023 
- MRM INFORMATION SYSTEMS LIMITEDDissolved- 03932038 - Dissolved on 17 September 2019 
- TRANSCOSMOS INFORMATION SYSTEMS LIMITED- 04020027 - Incorporated on 22 June 2000 
- BLASHFORD INFORMATION SYSTEMS LIMITEDActive - Proposal to Strike off- 04036178 - Incorporated on 18 July 2000