- O'SULLIVAN & CO LIMITEDActive - Proposal to Strike off- 04363436 - Incorporated on 30 January 2002 
- O'SULLIVAN RETAIL LIMITEDActive - Proposal to Strike off- 06235361 - Incorporated on 2 May 2007 
- O'SULLIVAN FACILITIES LIMITED- 06667922 - Incorporated on 8 August 2008 
- O'SULLIVAN DEVELOPMENTS LTDDisolved- 04151666 - Dissolved on 17 June 2025 
- PETER O'SULLIVAN LIMITEDDisolved- 05819271 - Dissolved on 9 August 2022 
- JAMIE O'SULLIVAN LTDActive - Proposal to Strike off- 07893762 - Incorporated on 29 December 2011 
- TOM O'SULLIVAN LTDActive - Proposal to Strike off- 08406210 - Incorporated on 18 February 2013 
- PATRICK O'SULLIVAN LTDActive - Proposal to Strike off- 09222222 - Incorporated on 17 September 2014 
- CPF O'SULLIVAN LIMITED- 09484977 - Incorporated on 12 March 2015 
- O'SULLIVAN PSYCHOTHERAPY LIMITEDActive - Proposal to Strike off- 10113470 - Incorporated on 8 April 2016 
- O'SULLIVAN CONSULTING LIMITEDDisolved- 10795653 - Dissolved on 1 November 2022 
- ENGLISH & O'SULLIVAN LIMITEDDisolved- 10876169 - Dissolved on 30 May 2023 
- O'SULLIVAN HOLDINGS LIMITEDDisolved- 10969352 - Dissolved on 20 September 2024 
- O'SULLIVAN METALWORK LIMITEDActive - Proposal to Strike off- 10998129 - Incorporated on 5 October 2017 
- O'SULLIVAN STUDIO LIMITEDDisolved- 13013109 - Dissolved on 23 January 2024 
- O'SULLIVAN LETTINGS LTDDisolved- 13537135 - Dissolved on 31 January 2023 
- O'SULLIVAN ART LTDDisolved- SC785388 - Dissolved on 11 March 2025 
- O'SULLIVAN HOLDINGS LTD- 16218574 - Incorporated on 30 January 2025 
- OWEN & OWEN CREATIVE LIMITED- 08375274 - Incorporated on 25 January 2013 
- OWENS & OWENS HOLDINGS LTD- 15785220 - Incorporated on 18 June 2024