- BIRMINGHAM CONCRETE AND GROUNDWORKS LIMITEDActive - Proposal to Strike off- 12072525 - Incorporated on 27 June 2019 
- BRAINSMITH LTDDissolved- 08219655 - Dissolved on 18 June 2013 
- BRAINSPORTS LTDDisolved- 04006319 - Dissolved on 13 July 2021 
- BRAINSTATION LTDDissolved- 06983435 - Dissolved on 22 March 2011 
- BRAINSFIELD LTDDissolved- 07294573 - Dissolved on 7 February 2012 
- BRAINS & LOOKS LTDDissolved- 06839273 - Dissolved on 1 April 2014 
- BRAINSLEARNING LTDActive - Proposal to Strike off- 09154986 - Incorporated on 31 July 2014 
- DRAIN BRAINS LTD- 08590117 - Incorporated on 28 June 2013 
- BAINS BRAINS LTDActive - Proposal to Strike off- 08342538 - Incorporated on 28 December 2012 
- BRAINSTORM 365 LTD- 11703102 - Incorporated on 29 November 2018 
- BRAINSYRUP LTDDisolved- 12568816 - Dissolved on 3 May 2022 
- BRAINS IN WORK LTDDisolved- 14466750 - Dissolved on 31 December 2024 
- BRAINS&CHEEK (2.0) LTD- 13169753 - Incorporated on 1 February 2021 
- BRAINS BLOOM LTD- 15430944 - Incorporated on 22 January 2024 
- BRAINSHARE LTD- 16031594 - Incorporated on 21 October 2024 
- BRAINSPARKACADEMY LTD- 16555411 - Incorporated on 2 July 2025 
- BIGGER BRAINS LTDLiquidation- 08009013 - Incorporated on 28 March 2012 
- BRAINS OULOOK LTDActive - Proposal to Strike off- 08025621 - Incorporated on 11 April 2012 
- BRAINS FOR HIRE LTDDissolved- 08356236 - Dissolved on 2 April 2019 
- BRAINS BRANDS LTD- 12360334 - Incorporated on 12 December 2019