- SIMONE LTD- 12033583 - Incorporated on 5 June 2019 
- MAT ARMSTRONG LTD- 12719327 - Incorporated on 4 July 2020 
- SIMON AND SIMON TRANSPORT LTDDisolved- 09537967 - Dissolved on 20 September 2022 
- SOUTHERN COMMUNICATIONS LIMITED- 01328040 - Incorporated on 1 September 1977 
- ARMSTRONG SCREWS & FIXINGS LIMITEDDisolved- 01165129 - Incorporated on 1 April 1974 
- ARMSTRONG NATIONWIDE LTD.- 03919924 - Incorporated on 4 February 2000 
- ARMSTRONG EXECUTIVE SEARCH LTD- 02129227 - Incorporated on 8 May 1987 
- ROBERT TEARLE LIMITED- 08064851 - Incorporated on 11 May 2012 
- ARMSTRONG CYCLES LIMITEDActive - Proposal to Strike off- 07571350 - Incorporated on 21 March 2011 
- ARMSTRONG WRIGHT LIMITEDActive - Proposal to Strike off- SC473046 - Incorporated on 20 March 2014 
- ETA ALPHA LIMITED- NI635572 
- SEN SUCCESS LTD- 13127574 - Incorporated on 12 January 2021 
- ARMSTRONG LAW LLPDissolved- OC325299 - Dissolved on 7 April 2009 
- ARMSTRONG TEC LTDActive - Proposal to Strike off- SC386514 - Incorporated on 5 October 2010 
- ARMSTRONG CHC LTDDisolved- 11616350 - Dissolved on 14 January 2025 
- ANN ARMSTRONG 1700 LTDActive - Proposal to Strike off- 10076491 - Incorporated on 22 March 2016 
- JAC ARMSTRONG LTD- 16341655 - Incorporated on 25 March 2025 
- SIMON TAGG (STL) LTD- 07816915 - Incorporated on 20 October 2011 
- T AND D ARMSTRONG LTDActive - Proposal to Strike off- 08853862 - Incorporated on 21 January 2014 
- ARMSTRONG MEP LTDDisolved- 13387060 - Dissolved on 18 October 2022