- BONITA O'BRIEN LTD- 12398880 - Incorporated on 13 January 2020 
- R.J. O'BRIEN (UK) LIMITEDDisolved- 04299065 - Dissolved on 25 April 2023 
- A. O'BRIEN SPINES LTD- 09273931 - Incorporated on 21 October 2014 
- E O'BRIEN IT LIMITEDActive - Proposal to Strike off- SC558335 - Incorporated on 22 February 2017 
- O’BRIEN & SON AUTO’S LTD- 13451384 - Incorporated on 11 June 2021 
- ARTHUR & O'BRIEN LTD- SC811668 - Incorporated on 26 May 2024 
- BRIEN BRICKS LTD- 16124030 - Incorporated on 9 December 2024 
- THE MR AND MRS EMPIRE LTD- 15603811 - Incorporated on 29 March 2024 
- O'BRIENS LIMITEDActive - Proposal to Strike off- 03712395 - Incorporated on 11 February 1999 
- O'BRIEN & CO LIMITED- 07475894 - Incorporated on 22 December 2010 
- SALLY O'BRIENS LTD- NI052057 - Incorporated on 14 October 2004 
- DANIEL R O'BRIEN O0060 LTDDisolved- 04846894 - Dissolved on 26 November 2024 
- DERMOT O'BRIEN LTD.Active - Proposal to Strike off- 08376073 - Incorporated on 25 January 2013 
- GERALD O'BRIEN LTDActive - Proposal to Strike off- 11295659 - Incorporated on 6 April 2018 
- PHILIP O'BRIEN LTDActive - Proposal to Strike off- 10105579 - Incorporated on 6 April 2016 
- O'BRIEN METALS LTD- 10652592 - Incorporated on 4 March 2017 
- KEANEXIONS LIMITEDActive - Proposal to Strike off- 10270749 - Incorporated on 11 July 2016 
- NOZ KEANE COACHING LTD- 13461281 - Incorporated on 17 June 2021 
- KEANES RAW APPAREL LTDDisolved- 13280612 - Dissolved on 4 October 2022 
- T KEANE ENGINEERING LTDDisolved- 14818071 - Dissolved on 1 August 2023