- O'SULLIVAN PROPERTIES LIMITED- 07783351 - Incorporated on 22 September 2011 
- DARREN O'SULLIVAN LTDDisolved- 12155011 - Dissolved on 30 November 2021 
- O'SULLIVAN SERVICES LIMITED- 11454192 - Incorporated on 9 July 2018 
- O'SULLIVAN MEDICAL LTDDisolved- 10900858 - Dissolved on 31 October 2023 
- O'SULLIVAN ESTATE LIMITEDDisolved- 10970063 - Dissolved on 1 August 2023 
- O'SULLIVAN LOGISTICS LIMITED- 09938083 - Incorporated on 6 January 2016 
- O'SULLIVAN ENGINEERING LIMITEDActive - Proposal to Strike off- 10279451 - Incorporated on 14 July 2016 
- O'SULLIVAN BUILDERS LTDActive - Proposal to Strike off- 10276951 - Incorporated on 13 July 2016 
- MARIA O'SULLIVAN LLP- OC429963 - Incorporated on 10 December 2019 
- O'SULLIVAN HIGHWAYS LTDDisolved- 13849943 - Dissolved on 13 December 2022 
- O'SULLIVAN ROOFING LTD- 13942903 - Incorporated on 27 February 2022 
- O'SULLIVAN ASSETS LIMITED- 15863760 - Incorporated on 29 July 2024 
- O'SULLIVAN DAVIES LTD- 16213838 - Incorporated on 28 January 2025 
- HARDCASTLE O'SULLIVAN LIMITED- 16479007 - Incorporated on 28 May 2025 
- APRILSEP LIMITEDActive - Proposal to Strike off- 08337470 - Incorporated on 20 December 2012 
- THE APRIL FRAMES LTD- SC656834 - Incorporated on 9 March 2020 
- APRIL ALLANSON LTDActive - Proposal to Strike off- 11453770 - Incorporated on 9 July 2018 
- CAROLINE APRIL LTD- 11904826 - Incorporated on 26 March 2019 
- APRIL YACHTING LTD- 12872015 - Incorporated on 10 September 2020 
- APRIL HONK LIMITEDActive - Proposal to Strike off- 12325164 - Incorporated on 20 November 2019