- GALLAGHER RETAIL LIMITED- NI726045 - Incorporated on 5 February 2025 
- GALLAGHER EQUESTRIAN LIMITED- 16512567 - Incorporated on 11 June 2025 
- GALLAGHER WILKS LTDActive - Proposal to Strike off- 06716181 - Incorporated on 6 October 2008 
- P.S. GALLAGHER LIMITEDDissolved- 03718689 - Dissolved on 21 September 2010 
- GALLAGHER FILMS LTD- NI652324 - Incorporated on 12 April 2018 
- GALLAGHER SCOTT LTD- SC624754 - Incorporated on 18 March 2019 
- AIDAN GALLAGHER 2521 LTDActive - Proposal to Strike off- 10096236 - Incorporated on 1 April 2016 
- M C GALLAGHER LIMITED- 12058936 - Incorporated on 19 June 2019 
- M A GALLAGHER LIMITEDActive - Proposal to Strike off- 10329729 - Incorporated on 15 August 2016 
- J.J. GALLAGHER LIMITED- 10549019 - Incorporated on 5 January 2017 
- FRANK GALLAGHER LTDDisolved- 13487428 - Dissolved on 27 December 2022 
- EDDIE GALLAGHER LIMITEDDissolved- 05019726 - Dissolved on 7 September 2010 
- GALLAGHER HEALTHCARE LIMITED- SC271897 - Incorporated on 12 August 2004 
- SHAUN GALLAGHER LIMITED- 05979295 - Incorporated on 26 October 2006 
- GALLAGHER PARTITIONING LTDDisolved- 03921940 - Dissolved on 7 January 2025 
- ARDARA GALLAGHER LIMITEDDissolved- 06338948 - Dissolved on 29 December 2009 
- GALLAGHER COMMUNICATION LIMITED- 03688114 - Incorporated on 23 December 1998 
- GALLAGHER GROUP LIMITED- 02297920 - Incorporated on 20 September 1988 
- GALLAGHER & CROPTON LIMITEDLiquidation- 04027277 - Incorporated on 5 July 2000 
- JOHN GALLAGHER LIMITEDActive - Proposal to Strike off- 07530999 - Incorporated on 15 February 2011