- MR JOHN SAMMERS LTDDissolved- 08055273 - Dissolved on 29 October 2013 
- MR MIKE JOHNSON LTDDisolved- 16039968 - Dissolved on 11 March 2025 
- MR JOHN BURROWS LTD- 15023523 - Incorporated on 24 July 2023 
- JOHN D O’CONNOR AND SONS LIMITEDDisolved- 12452623 - Dissolved on 17 August 2021 
- CARL O CONNOR ENGINEERS LIMITED- 02186097 - Incorporated on 2 November 1987 
- J O CONNOR & SONS LIMITEDDisolved- 09330253 - Dissolved on 3 September 2024 
- JOSEPH O' CONNOR UK LTDLiquidation- 09379063 - Incorporated on 8 January 2015 
- O' CONNOR ENGINEERING SERVICES LTDDisolved- 12926184 - Dissolved on 13 February 2024 
- H A O' CONNOR LIMITEDActive - Proposal to Strike off- 10061980 - Incorporated on 14 March 2016 
- CARL O CONNOR ENGINEERING LIMITEDDissolved- 05876871 - Dissolved on 19 August 2014 
- T.J. O CONNOR GROUP LIMITED- 06790499 - Incorporated on 14 January 2009 
- MACKINTOSH O`CONNOR ASSOCIATES LIMITEDActive - Proposal to Strike off- 07298507 - Incorporated on 29 June 2010 
- O' CONNOR PROJECT SOLUTIONS LTDDisolved- 11513640 - Dissolved on 28 January 2023 
- SEAMUS O CONNOR PLASTERING LTDActive - Proposal to Strike off- 09504736 - Incorporated on 23 March 2015 
- O CONNOR CONSTRUCTION WATFORD LTD- 12743579 - Incorporated on 15 July 2020 
- THE ACCOUNTS COMPANY (S.EAST) LIMITEDActive - Proposal to Strike off- 07535455 - Incorporated on 18 February 2011 
- GBL EDUCATION LTDActive - Proposal to Strike off- 11037629 - Incorporated on 30 October 2017 
- MICHAEL JOSEPH O'CONNOR- 11A MAIN STREET, ENNISKILLEN, COUNTY FERNMAGH, BT94 1TF 
- MICHAEL JOSEPH O'CONNOR- Born September 1951 - 11A MAIN STREET, ENNISKILLEN, COUNTY FERNMAGH, BT94 1TF 
- MR MICHAEL LANE LIMITEDActive - Proposal to Strike off- 07952103 - Incorporated on 16 February 2012