- O'SULLIVAN ESTATES LTD- 15072852 - Incorporated on 15 August 2023 
- O'SULLIVAN TM LTDActive - Proposal to Strike off- 15706516 - Incorporated on 7 May 2024 
- O'SULLIVAN MOTORS LIMITEDDisolved- 16233291 - Dissolved on 24 June 2025 
- SMITH & O'SULLIVAN LIMITEDDisolved- 01394213 - Dissolved on 18 May 2025 
- ANDREW O'SULLIVAN LTD- 04380221 - Incorporated on 22 February 2002 
- MACPHERSON O'SULLIVAN LLPDissolved- OC304858 - Dissolved on 4 August 2009 
- O'SULLIVAN SOLUTIONS LTD- 08037732 - Incorporated on 19 April 2012 
- GREG O'SULLIVAN LIMITED- 05779645 - Incorporated on 12 April 2006 
- MACPHERSON O'SULLIVAN LIMITEDActive - Proposal to Strike off- 08089794 - Incorporated on 30 May 2012 
- CHARLIE O'SULLIVAN LIMITED- 08971353 - Incorporated on 1 April 2014 
- O'SULLIVAN JOINERY LTD- 09687754 - Incorporated on 15 July 2015 
- O'SULLIVAN PHOTOGRAPHY LTDActive - Proposal to Strike off- 08615579 - Incorporated on 18 July 2013 
- PAUL O'SULLIVAN LIMITEDActive - Proposal to Strike off- 09073003 - Incorporated on 5 June 2014 
- TIM O'SULLIVAN LTDActive - Proposal to Strike off- 09138905 - Incorporated on 21 July 2014 
- O'SULLIVAN UTILITIES LIMITEDLiquidation- 09347125 - Incorporated on 9 December 2014 
- O'SULLIVAN PRODUCTIONS LTDDisolved- 11264855 - Dissolved on 20 August 2023 
- LUKE O'SULLIVAN LTD- 10858676 - Incorporated on 10 July 2017 
- O'SULLIVAN ENTERPRISES LIMITEDActive - Proposal to Strike off- 09762623 - Incorporated on 4 September 2015 
- O'SULLIVAN QUINN LTDDisolved- 10046964 - Dissolved on 12 October 2021 
- O'SULLIVAN-TAYLOR LTDDisolved- 12351520 - Dissolved on 16 May 2023