- A.J. O'CONNOR LIMITED- 02781553 - Incorporated on 20 January 1993 
- KEVIN O'CONNOR LIMITEDDissolved- 04601195 - Dissolved on 13 July 2010 
- CHRIS O'CONNOR LIMITEDDissolved- 05258768 - Dissolved on 15 February 2011 
- O'CONNOR ENGINEERING LIMITED- 05446099 - Incorporated on 6 May 2005 
- O'CONNOR PARTNERSHIP LIMITED- 05995357 - Incorporated on 10 November 2006 
- O'CONNOR CONSULTANCY LIMITEDDisolved- 06803308 - Dissolved on 30 April 2024 
- O'CONNOR P LIMITED- 07958873 - Incorporated on 21 February 2012 
- O'CONNOR DESIGN LIMITED- 08061174 - Incorporated on 8 May 2012 
- O'CONNOR PUBLICITY LTDActive - Proposal to Strike off- 07493056 - Incorporated on 14 January 2011 
- O'CONNOR CHIROPRACTIC LTD- 07345713 - Incorporated on 13 August 2010 
- O'CONNOR MEDICAL LIMITED- 07332822 - Incorporated on 2 August 2010 
- STURGES O'CONNOR LIMITED- 07435512 - Incorporated on 10 November 2010 
- GEORGE O'CONNOR LIMITED- 04175390 - Incorporated on 8 March 2001 
- O'CONNOR TECHNOLOGIES LIMITEDDissolved- 08870733 - Dissolved on 19 February 2019 
- O'CONNOR MURRAY LTDActive - Proposal to Strike off- NI620922 - Incorporated on 14 October 2013 
- O'CONNOR FITNESS LTDDissolved- SC402825 - Dissolved on 21 February 2014 
- O'CONNOR CONSULTING LIMITEDDisolved- 09450444 - Dissolved on 19 April 2022 
- O'CONNOR SOLUTIONS LIMITEDDisolved- 09088440 - Dissolved on 26 September 2024 
- O'CONNOR DIXON LIMITEDDisolved- 13497132 - Dissolved on 30 May 2023 
- BRISSETT & O'CONNOR LTDActive - Proposal to Strike off- 11652325 - Incorporated on 31 October 2018