- GALLAGHER BROS. LIMITED- 01775668 - Incorporated on 6 December 1983 
- GALLAGHER CONSULTANTS LTD- SC260887 - Incorporated on 16 December 2003 
- GALLAGHER HOLDINGS LIMITED- 01579410 - Incorporated on 12 August 1981 
- GALLAGHER INVESTMENTS LIMITED- 02760943 - Incorporated on 27 October 1992 
- GALLAGHER RESOURCES LIMITED- 06501701 - Incorporated on 12 February 2008 
- AIDAN GALLAGHER LIMITEDActive - Proposal to Strike off- 09477264 - Incorporated on 9 March 2015 
- WILLIAM GALLAGHER LIMITEDDisolved- NI007285 - Dissolved on 20 August 2024 
- GALLAGHER OPPORTUNITIES LIMITED- 09076396 - Incorporated on 9 June 2014 
- GALLAGHER-WEST LIMITED- 09155725 - Incorporated on 31 July 2014 
- GALLAGHER INNS LIMITEDActive - Proposal to Strike off- 08456126 - Incorporated on 21 March 2013 
- GALLAGHER STONEMASONS LIMITEDDisolved- NI670175 - Dissolved on 21 June 2022 
- JASON GALLAGHER LTDDisolved- 12814079 - Dissolved on 18 January 2022 
- GRANT GALLAGHER LIMITED- 09760404 - Incorporated on 3 September 2015 
- KELLY GALLAGHER LIMITED- NI634183 
- GALLAGHER LOGISTICS LIMITEDActive - Proposal to Strike off- 09887206 - Incorporated on 24 November 2015 
- GALLAGHER ARTWORK LTDDisolved- 09998169 - Dissolved on 15 July 2025 
- STEPHEN GALLAGHER LIMITEDActive - Proposal to Strike off- SC532031 - Incorporated on 7 April 2016 
- RONAN GALLAGHER LTDDisolved- 12106980 - Dissolved on 29 October 2024 
- GALLAGHER-COWLEY LTDDisolved- SC637596 - Dissolved on 3 January 2024 
- SALLY GALLAGHER LIMITED- 12259825 - Incorporated on 14 October 2019