- GWYN HOTELS LIMITEDDissolved- 03259047 - Dissolved on 9 September 2011 
- GWYN DERWEN CICDisolved- 12706308 - Dissolved on 18 October 2022 
- JEFFRIES ASSOCIATES LLPDissolved- OC304741 - Dissolved on 11 January 2011 
- JEFFRIES LOGISTICS LIMITEDActive - Proposal to Strike off- 08050129 - Incorporated on 30 April 2012 
- JEFFRIES JOINERY LIMITED- 05275372 - Incorporated on 2 November 2004 
- PHILLIP JEFFRIES LTD- 08753832 - Incorporated on 30 October 2013 
- JEFFRIES JUNGLE LIMITEDDissolved- 09806477 - Dissolved on 16 January 2018 
- JEFFRIES TURNER LIMITED- 10856443 - Incorporated on 7 July 2017 
- JEFFRIES CONSULTING LIMITED- 10417761 - Incorporated on 10 October 2016 
- NICHOLAS JEFFRIES LTDActive - Proposal to Strike off- 15713216 - Incorporated on 10 May 2024 
- GWYN THOMAS LIMITED- 01259319 - Incorporated on 19 May 1976 - Brettell Lane, Brierley Hill, DY5 3LG 
- BETHELL,GWYN & CO.LIMITEDActive - Proposal to Strike off- 00525814 - Incorporated on 16 November 1953 
- CASTELL GWYN LTD- 09201637 - Incorporated on 3 September 2014 
- GWYN TRADING LTDDisolved- 13074831 - Dissolved on 7 March 2023 
- CAE GWYN LIMITED- 15971798 - Incorporated on 23 September 2024 
- GWYNERIN LTDDisolved- NI665923 - Dissolved on 22 April 2025 
- GWYNSURE LTDDissolved- 07788626 - Dissolved on 3 April 2012 
- GWYNT Y GLOG CYF- 09793252 - Incorporated on 24 September 2015 
- MAES Y GWYNT LTDActive - Proposal to Strike off- 09125408 - Incorporated on 10 July 2014 
- THOMAS SIMSON & CO LIMITED- 04193860 - Incorporated on 4 April 2001