- PETROSKY LIMITEDDisolved- 15520260 - Dissolved on 25 February 2025 
- PETROS CONSULTING SOLUTIONS LIMITED- 08643319 - Incorporated on 8 August 2013 
- PETROS DESIGN ENGINEERING LTDDisolved- 12008547 - Dissolved on 30 November 2021 
- PETROS-PAVLOS YPSILANTIS LTDActive - Proposal to Strike off- 11037230 - Incorporated on 30 October 2017 
- PETROSAL LIMITED- 06270637 - Incorporated on 6 June 2007 
- PETROSOL LIMITED- NI626702 
- PETROSTARS SPX LTD- SC554586 - Incorporated on 13 January 2017 
- PETROSAN CONST LTDDisolved- 14122545 - Dissolved on 24 October 2023 
- BRUNTWOOD (1 DALE STREET) LIMITED- 01403094 - Incorporated on 30 November 1978 
- PETROSEDI LIMITED- 08958862 - Incorporated on 25 March 2014 
- PETROSAI ENERGY LTD- 10641337 - Incorporated on 27 February 2017 
- PETROSTEM (UK) LIMITEDDisolved- 03581607 - Dissolved on 25 November 2022 
- PETROSMART LIMITEDDissolved- 07442549 - Dissolved on 26 June 2012 
- PETROSCRIBE LIMITEDActive - Proposal to Strike off- 09739108 - Incorporated on 19 August 2015 
- PETROSOLUTIONS 55 LIMITEDActive - Proposal to Strike off- 10741354 - Incorporated on 26 April 2017 
- EFD PETROSERVICES LTDDissolved- 06312309 - Dissolved on 10 November 2009 
- GIS PETROSOLUTIONS LTDLiquidation- 09017430 - Incorporated on 29 April 2014 
- PETROSTAR EXPORT L.P.- SL009741 - Incorporated on 13 October 2011 
- PETROS PRODUCE UK LTDDissolved- 08088698 - Dissolved on 13 August 2013 
- PETROSERV LIMITEDDisolved- 11840255 - Dissolved on 14 March 2023