- TOM BRIEN LTDDissolved- 07441589 - Dissolved on 7 May 2019 
- TOM O'BRIEN LTD- 13811412 - Incorporated on 21 December 2021 
- MR PHILIP DAVID ORBELL LIMITED- 15356296 - Incorporated on 16 December 2023 
- MR DAVID FRANCIS PALFREMAN LTD- 15592525 - Incorporated on 25 March 2024 
- DR. COLM O'BRIENActive - Proposal to Strike off- NI605394 
- O'BRIEN NDT LTDDisolved- 07607804 - Dissolved on 6 September 2022 
- JOE O'BRIEN LTD- 12183141 - Incorporated on 2 September 2019 
- BRIENNE LTDDisolved- 14147731 - Dissolved on 16 April 2024 
- MR PAUL DAVID CHISHOLM LIMITEDDisolved- 08471885 - Dissolved on 2 July 2024 
- BRIENOU LTDActive - Proposal to Strike off- 13387120 - Incorporated on 11 May 2021 
- R.J. O'BRIEN (EUROPE) LIMITED- 07432813 - Incorporated on 8 November 2010 
- DAVID KIM BRIEN- Born January 1960 - 29 SILCOATES AVENUE, RENTHORPE, WAKEFIELD, WEST YORKSHIRE, WF2 0UP 
- DAVID KIM BRIEN- THE GRAPES TOWN ROAD, CROSTON, LEYLAND, LANCASHIRE, UNITED KINGDOM, PR26 9RB 
- Philip Neil, Mr. BEARE- Born December 1960 - 101a Crow Green Road, Pilgrims Hatch, Brentwood, England, CM15 9RP 
- Neil Mark, Mr. PAINTON- Born October 1973 - 231 Poplar Grove, Kennington, Oxford, England, OX1 5QT 
- Angus Neil, Mr. MURRAY- Born October 1963 - 35a King George Square, Richmond, Surrey, TW10 6LF 
- DAVID KIM BRIEN- Born January 1960 - 29 SILCOATES AVENUE, WRENTHORPE, WAKEFIELD, WEST YORKSHIRE, UNITED KINGDOM, WF2 0UP 
- Neil, Mr. MCWILLIAMS- Born December 1969 - Sandhaven Beachway, Blyth, Northumberland, United Kingdom, NE24 3PG 
- David, Mr. YAPP- Born September 1943 - Ivydene Main Road, Dibden, Southampton, England, SO45 5TB 
- Neil Glenn, Mr. MARTIN- Born June 1984 - 3 Enterprise House 8 Essex Road, Dartford, Kent, United Kingdom, DA1 2AU