- D365 ADDONS LIMITEDDisolved- 13077731 - Dissolved on 16 November 2021 
- PC ADDONS LIMITED- 04632507 - Incorporated on 9 January 2003 
- ADDORAH LIMITEDDisolved- 12740664 - Dissolved on 21 December 2021 
- ADDON CUSTOMS LTDDissolved- 10105159 - Dissolved on 15 May 2018 
- ADDONIS LIMITEDDissolved- 06927901 - Dissolved on 29 March 2011 
- ADDOMAN LIMITED- 07169221 - Incorporated on 25 February 2010 
- ADDONOG LIMITEDActive - Proposal to Strike off- 08934866 - Incorporated on 12 March 2014 
- ADDOMME BEACON CAFE LIMITEDDisolved- 08503833 - Dissolved on 27 September 2022 
- ULTIMATE ADDONS LTDDisolved- 05161448 - Dissolved on 14 October 2021 
- ADDOOCO IT LIMITED- 06687050 - Incorporated on 2 September 2008 
- ADDONOVA LIMITED- 08872382 - Incorporated on 3 February 2014 
- ADDOBECK LIMITEDDisolved- 09028027 - Dissolved on 15 August 2023 
- ADDON PROPERTY LTDDisolved- 13728677 - Dissolved on 9 May 2023 
- ADDO INVESTMENTS LIMITEDDissolved- 07282094 - Dissolved on 21 January 2014 
- ADDO IMPACT LIMITEDDissolved- 08230581 - Dissolved on 19 May 2015 
- ADDO PRINTING LTDIn Administration/Administrative Receiver- 06577348 - Incorporated on 28 April 2008 
- ADDO ACCOUNTING LTD- 08664492 - Incorporated on 27 August 2013 
- NITEO ADDO LIMITEDActive - Proposal to Strike off- 08741599 - Incorporated on 21 October 2013 
- ADDO EDUCATION LIMITEDActive - Proposal to Strike off- 08416526 - Incorporated on 25 February 2013 
- ADDO EQUITY LIMITED- 09362122 - Incorporated on 19 December 2014