- SIR TRANS LTDDisolved- 14114379 - Dissolved on 24 October 2023 
- SIR MANAGEMENT LTDDisolved- 13629571 - Dissolved on 14 March 2023 
- SIR RESIDENTIAL LIMITED- 13634884 - Incorporated on 21 September 2021 
- SIR LONDRES LTD- 14841681 - Incorporated on 2 May 2023 
- SIR TRADING LTD- 15577146 - Incorporated on 19 March 2024 
- SIR ROBIN LTD- 16090252 - Incorporated on 20 November 2024 
- SIR JANA LIMITED- 16158650 - Incorporated on 2 January 2025 
- SIR TIMBER LIMITED- 16227414 - Incorporated on 4 February 2025 
- SIR EDWARD LTD- 16549387 - Incorporated on 30 June 2025 
- SIRRUS LTDActive - Proposal to Strike off- 07119826 - Incorporated on 8 January 2010 
- SIREAG LTD.Dissolved- 08144377 - Dissolved on 25 February 2014 
- SIRIUS360 LTDActive - Proposal to Strike off- 07734722 - Incorporated on 9 August 2011 
- SIRIONA SA- FC029710 - Incorporated on 24 May 2010 
- SIRECO LTD- 07538927 - Incorporated on 22 February 2011 
- M M R SIRIUS LTDDissolved- 01677550 - Dissolved on 20 November 2012 
- KAM SIRA LTD- 08240037 - Incorporated on 4 October 2012 
- SIRKEL LTD- 06609916 - Incorporated on 3 June 2008 
- SIRRIS LTDDisolved- 07054382 - Dissolved on 5 September 2023 
- SIRACH LTDActive - Proposal to Strike off- 08483399 - Incorporated on 11 April 2013 
- SIRONA LTD- 11555184 - Incorporated on 6 September 2018