- NIC O'BRIEN LTDDisolved- 14427080 - Dissolved on 26 March 2024 
- SUE O'BRIEN LTDDissolved- 08253402 - Dissolved on 4 December 2018 
- O'BRIENS EA LTDDissolved- 10201503 - Dissolved on 5 November 2019 
- TL O'BRIENS LTDLiquidation- NI066619 - Incorporated on 16 October 2007 
- JON O'BRIEN LTDDissolved- 05841104 - Dissolved on 16 October 2012 
- TOM BRIEN LTDDissolved- 07441589 - Dissolved on 7 May 2019 
- TOM O'BRIEN LTD- 13811412 - Incorporated on 21 December 2021 
- MRSGB LTDDisolved- 13991213 - Dissolved on 22 August 2023 
- MRS FOX LTDDisolved- 14120353 - Dissolved on 19 December 2023 
- MRSAB LTDDisolved- 13712578 - Dissolved on 10 December 2024 
- MRSXY LTDActive - Proposal to Strike off- 15636541 - Incorporated on 11 April 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 
- SELINA CORP LIMITEDDisolved- 08634235 - Dissolved on 23 November 2024 
- SELINA CLEANING LIMITEDDisolved- 13710327 - Dissolved on 9 May 2023 
- ASK MRS S LTD- 12841712 - Incorporated on 27 August 2020 
- MRSRP LLP- OC421078 - Incorporated on 16 February 2018 
- MRS MAC LTDDissolved- 05520432 - Dissolved on 16 November 2010