- CALLUM MACKENZIE LIMITED- 06641490 - Incorporated on 9 July 2008 
- CALLUM WILLIAMS LIMITEDDisolved- 11620584 - Dissolved on 27 December 2022 
- CALLUM INVESTMENT LTDDisolved- 11767792 - Dissolved on 18 June 2024 
- CALLUM CONSULTANCY LIMITED- 09859930 - Incorporated on 6 November 2015 
- CALLUM JOHNSON LIMITED- 09938717 - Incorporated on 6 January 2016 
- CALLUM BARRON LIMITED- 11909702 - Incorporated on 27 March 2019 
- CALLUM MOORE LIMITED- 12008022 - Incorporated on 21 May 2019 
- CALLUM SERVICES LIMITEDDisolved- 03136253 - Dissolved on 7 February 2023 
- CALLUM WINTON LIMITEDDisolved- 05558674 - Dissolved on 15 April 2025 
- CALLUM CONSULTING LIMITEDActive - Proposal to Strike off- 07745638 - Incorporated on 18 August 2011 
- CALLUM BUILDERS LIMITEDActive - Proposal to Strike off- 07404758 - Incorporated on 12 October 2010 
- CALLUM DONNAN LIMITEDActive - Proposal to Strike off- 08580836 - Incorporated on 24 June 2013 
- CALLUM FRASER LIMITEDLiquidation- SC467035 - Incorporated on 9 January 2014 
- CALLUM FRANKLIN LIMITEDActive - Proposal to Strike off- 09147919 - Incorporated on 25 July 2014 
- CALLUM ARMSTRONG LIMITEDActive - Proposal to Strike off- 10305461 - Incorporated on 1 August 2016 
- CALLUM DAWSON LIMITEDDisolved- 14219750 - Dissolved on 12 December 2023 
- CALLUM ROBERTSON LTD- SC726359 - Incorporated on 15 March 2022 
- THOMAS CALLUM LIMITED- 14634662 - Incorporated on 2 February 2023 
- CALLUM & TREASURES CIC- 15131760 - Incorporated on 11 September 2023 
- CALLUM BOSCOE LIMITEDDisolved- 15138211 - Dissolved on 18 February 2025