- T O'SULLIVAN LIMITED- 04615344 - Incorporated on 12 December 2002 
- O'SULLIVAN RESOURCES LIMITEDLiquidation- 06769376 - Incorporated on 9 December 2008 
- O'SULLIVAN PROJECTS LIMITEDDissolved- 06855092 - Dissolved on 2 November 2010 
- O'SULLIVAN TRADING LIMITED- 07483823 - Incorporated on 6 January 2011 
- KATIE O'SULLIVAN LTDActive - Proposal to Strike off- 07887126 - Incorporated on 20 December 2011 
- CROSSING O'SULLIVAN LIMITEDActive - Proposal to Strike off- 04313257 - Incorporated on 30 October 2001 
- O'SULLIVAN PLASTERERS LTD- 09232634 - Incorporated on 24 September 2014 
- LYNNE O'SULLIVAN LIMITEDActive - Proposal to Strike off- 09237537 - Incorporated on 26 September 2014 
- O'SULLIVAN 1960 LIMITEDActive - Proposal to Strike off- 08862002 - Incorporated on 27 January 2014 
- KEIRON O'SULLIVAN LIMITED- 09053064 - Incorporated on 22 May 2014 
- O'SULLIVAN FUTURES LIMITED- 09799910 - Incorporated on 29 September 2015 
- IAN O'SULLIVAN LIMITED- 09826254 - Incorporated on 15 October 2015 
- O'SULLIVAN BMS LIMITEDActive - Proposal to Strike off- 11324897 - Incorporated on 24 April 2018 
- DPM O'SULLIVAN LIMITEDDisolved- 11889336 - Dissolved on 17 August 2021 
- CALLUM O'SULLIVAN LTDDisolved- 11862433 - Dissolved on 8 August 2023 
- O'SULLIVAN MACFARLANE LTD- NI639239 - Incorporated on 21 June 2016 
- O'SULLIVAN HOMES LIMITED- 12074084 - Incorporated on 28 June 2019 
- O'SULLIVAN IT LTD- 11231835 - Incorporated on 5 March 2018 
- EVE O'SULLIVAN LIMITEDDissolved- 10215073 - Dissolved on 16 October 2018 
- CIAN O'SULLIVAN LIMITEDDisolved- 13382357 - Dissolved on 27 May 2025