- 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 
- DANIEL DANIELA'S LTDDisolved- 14903214 - Dissolved on 30 April 2024 
- AIDFIRST ELECTRICAL LIMITEDDissolved- 06543279 - Dissolved on 4 September 2012 
- PRESAFE LTD- 03070651 - Incorporated on 21 June 1995 
- SEECODE LTD- 11566854 - Incorporated on 13 September 2018 
- O'SULLIVANS LTDDissolved- 06788022 - Dissolved on 10 August 2010 
- SULLIVAN (UK) LTD- 08696145 - Incorporated on 18 September 2013 
- VL SULLIVAN LTDDisolved- 14008882 - Dissolved on 10 October 2023 
- SULLIVAN R US LTDDisolved- 13722072 - Dissolved on 18 April 2023 
- KW SULLIVAN LTDDisolved- 13785813 - Dissolved on 22 July 2025 
- IAN OWEN A.D. LTDActive - Proposal to Strike off- 07231891 - Incorporated on 22 April 2010 
- R OWEN & SON LTD- 05737756 - Incorporated on 9 March 2006 
- F OWEN & SON LTDLiquidation- 04745469 - Incorporated on 25 April 2003 
- R OWEN & SUN LTD- 06417844 - Incorporated on 5 November 2007 
- SID OWEN LTD- SC334764 - Incorporated on 3 December 2007 
- RJ OWENS LTD.Active - Proposal to Strike off- 09546222 - Incorporated on 16 April 2015