- A O'BRIEN LTDDisolved- 09424295 - Dissolved on 9 May 2023 
- O'BRIEN.C LTD- 11885758 - Incorporated on 15 March 2019 
- THE FORMWORK COMPANY LIMITED- 06818552 - Incorporated on 13 February 2009 
- BRIEN LTDDisolved- 08582463 - Dissolved on 8 August 2023 
- RONALD MICHAEL WILLIAM GRUNDY LTD- 15927863 - Incorporated on 31 August 2024 
- K&A O'BRIEN LTD- 03816457 - Incorporated on 26 July 1999 
- A & S O'BRIEN LTDActive - Proposal to Strike off- SC451340 - Incorporated on 31 May 2013 
- D M O'BRIEN LTD- 12118376 - Incorporated on 23 July 2019 
- C O'BRIEN LTDActive - Proposal to Strike off- 09910506 - Incorporated on 10 December 2015 
- K & J O'BRIEN LTDDisolved- 14994563 - Dissolved on 17 December 2024 
- PIRIE & HUNTER LIMITED- SC428946 - Incorporated on 24 July 2012 
- RONALD WEB LTDDisolved- 14108579 - Dissolved on 17 October 2023 
- RONALD TURNERActive - Proposal to Strike off- 08724579 - Incorporated on 9 October 2013 
- PIRIE & SMITH LIMITED- 02873291 - Incorporated on 18 November 1993 
- PIRIE PROPERTY LIMITEDDisolved- 14784033 - Dissolved on 1 October 2024 
- KROGH & PARTNERS LIMITED- 02349266 - Incorporated on 17 February 1989 
- REALISATIONS (RT) LIMITEDLiquidation- 03175284 - Incorporated on 20 March 1996 
- RONALD LDC LTDActive - Proposal to Strike off- 11097423 - Incorporated on 5 December 2017 
- RONALD LAM LTD- 16208593 - Incorporated on 26 January 2025 
- PIRIE DEVELOPMENTS LTDDissolved- SC343765 - Dissolved on 12 March 2010