- PETER O'SULLIVAN LIMITEDDisolved- 05819271 - Dissolved on 9 August 2022 
- DANIEL O'SULLIVAN LIMITEDActive - Proposal to Strike off- 08314446 - Incorporated on 30 November 2012 
- 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 
- 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 
- B.M. SULLIVAN INC.- FC021959 - Incorporated on 6 July 1999 
- N & A O'SULLIVAN LTD- 04724855 - Incorporated on 7 April 2003 
- M O'SULLIVAN LTDLiquidation- 07620656 - Incorporated on 3 May 2011 
- S. SULLIVAN LTDActive - Proposal to Strike off- 07280693 - Incorporated on 10 June 2010 
- T SULLIVAN LTD- 11563390 - Incorporated on 11 September 2018 
- SULLIVAN J LTDActive - Proposal to Strike off- 11767090 - Incorporated on 15 January 2019