- WARD SIMPSON LTD- 04435027 - Incorporated on 9 May 2002 
- SIMPSON RAIL LTDActive - Proposal to Strike off- 10141706 - Incorporated on 22 April 2016 
- GARY M SIMPSON LTD- SC520487 - Incorporated on 17 November 2015 
- MARC A SIMPSON LTDActive - Proposal to Strike off- SC550724 - Incorporated on 21 November 2016 
- MIKE SIMPSON LTD- 11806822 - Incorporated on 5 February 2019 
- JOHN T SIMPSON LTD- 11896704 - Incorporated on 21 March 2019 
- SIMPSON LETS LTDDisolved- 13656179 - Dissolved on 28 March 2023 
- RESPIREX INTERNATIONAL LIMITED- 00592506 - Incorporated on 25 October 1957 
- PALINTEST LIMITED- 01204118 - Incorporated on 18 March 1975 
- AMAZE MARKETING LIMITED- 04557661 - Incorporated on 9 October 2002 
- BLUE SKY ACCOUNTING SOLUTIONS LIMITEDActive - Proposal to Strike off- SC400000 - Incorporated on 20 May 2011 
- SIMPSON & PARTNERS HOLDINGS LIMITED- 09332307 - Incorporated on 28 November 2014 
- SIMPSON COLE LTD.Active - Proposal to Strike off- 07608664 - Incorporated on 19 April 2011 
- SIMPSON BROS LTDDissolved- 07695928 - Dissolved on 21 January 2014 
- SIMPSON & WOOD LTD- 04504486 - Incorporated on 6 August 2002 
- J SIMPSON GRAY LTD.Active - Proposal to Strike off- SC602330 - Incorporated on 11 July 2018 
- GALE & SIMPSON LTD- 09612486 - Incorporated on 28 May 2015 
- KAY SIMPSON & CO. LTDDisolved- SC645226 - Dissolved on 13 December 2022 
- RIA & KA SIMPSON LTD- 13281392 - Incorporated on 21 March 2021 
- SIMPSON ASDT LTDDisolved- 14830945 - Dissolved on 1 October 2024