| Buddies Yate Community Interest Company | Bristol | 2022 |
| Buddiesworld Ltd | Grimsby | 2023 |
| Budding Prescribing Limited | Cheadle | 2025 |
| Budding Tots Ltd | Salford | 2025 |
| Buddu Limited | Derby | 2024 |
| Buddy Bear Trust | Dungannon | 1989 |
| Buddy Bridge CIC | London | 2025 |
| Buddy Childcare Ltd | Sittingbourne | 2022 |
| Buddy Dog Ltd | Newport Pagnell | 2025 |
| Buddy Omotosho Healthcare Ltd | Leicester | 2018 |
| Buddyhub C.I.C. | London | 2014 |
| Bude Eyecentre Limited | Barnstaple | 2004 |
| Bude Yoga and Therapy Space Limited | Ross-On-Wye | 2018 |
| Buderim Ltd | Sutton Coldfield | 2021 |
| Budgen Orthopaedics Limited | Leeds | 2010 |
| Budget Safe Ltd | Winsford | 2016 |
| Budgie Healthcare Limited | Colchester | 2022 |
| Budika Limited | Norwich | 2018 |
| Budlite Healthcare Ltd | Belfast | 2022 |
| Buds & Blossoms Ltd | Oldham | 2022 |
| Buds and Blooms Limited | Watford | 2017 |
| Buds That Blossom Aylesbury Limited | Chinnor | 2022 |
| Buds That Blossom Chinnor Limited | Chinnor | 2021 |
| Buds That Blossom Limited | Chinnor | 2019 |
| Budvan Anaesthesia Ltd | Liverpool | 2023 |
| Budwood Limited | Bromsgrove | 2018 |
| Budworth CIO Ltd | Prenton | 2025 |
| Budz Afterschool Club Ltd | Winchester | 2019 |
| Bufag Care Ltd | Gillingham | 2022 |
| Bufd Limited | Wilmslow | 2024 |
| Buff & Polish (Chigwell) Limited | Chigwell | 2017 |
| Buff Group Enterprises Limited | Cheadle Hulme | 2023 |
| Buff Natural Body Care Ltd | Newton Abbot | 2015 |
| Buffalo Bull Limited | Derby | 2015 |
| Buffalo Trades Limited | Chatteris | 2015 |
| BUG Thugs UK Ltd | London | 2017 |
| Bugg Ltd | Redruth | 2025 |
| Buggies and Brews Community CIC | Sheffield | 2026 |
| Bugle Library of Things CIC | St. Austell | 2020 |
| Bugo Services Limited | Bristol | 2025 |
| Bugwicks Barn Limited | Leicester | 2026 |
| Bugz and Bunnies CIC | Northwich | 2022 |
| Buhati Limited | Basingstoke | 2021 |
| Buhle Care Services Ltd | Rochdale | 2026 |
| Buhlebenkosi Limited | Bolton | 2014 |
| Buhlebokumazi Healthcare Services Limited | Nottingham | 2022 |
| Buick Consulting Limited | Mersea Island | 2017 |
| Build a Body Ltd | Bradford | 2025 |
| Build a Bridge Foundation | London | 2020 |
| Build a Bridge Therapy Ltd | London | 2024 |
| Build a Community Ltd | Stalybridge | 2025 |
| Build Agility Strength Ltd | Norwich | 2023 |
| Build and Social Care Health Ltd | Birmingham | 2024 |
| Build Brilliance Ltd | London | 2022 |
| Build Charity Limited | Norwich | 2012 |
| Build Futures CIC | Dudley | 2026 |
| Build Local Limited | Enfield | 2015 |
| Build ME UP Buttercup Limited | London | 2025 |
| Build on Belief Limited | London | 2012 |
| Build U Fitness Limited | Stratford-Upon-Avon | 2021 |
| Build Your Village Ltd | Northampton | 2025 |
| Build Your Wellbeing Ltd | Newport | 2018 |
| Building a Neurodiverse Community CIC | Bridport | 2026 |
| Building a New Direction Ltd | London | 1996 |
| Building Access Support & Engagement Limited | Banbridge | 2026 |
| Building Balance Limited | Frome | 2023 |
| Building Blocks and Bridges Limited | Swindon | 2024 |
| Building Blocks Care Limited | Rochford | 2024 |
| Building Blocks Day Care Ltd | Luton | 2025 |
| Building Blocks Day Nursery (Anderton) Limited | Wirral | 2007 |
| Building Blocks Day Nursery (Bold Heath) Limited | Wirral | 2007 |
| Building Blocks Day Nursery (Little Leigh) Limited | Wirral | 2007 |
| Building Blocks Day Nursery (NI) Ltd | Antrim | 2013 |
| Building Blocks Day Nursery (NW) Limited | Oldham | 2011 |
| Building Blocks Day Nursery (Yorkshire) Limited | Oldham | 2025 |
| Building Blocks Daycare Catford Limited | London | 2015 |
| Building Blocks Kids Nursery Limited | London | 2017 |
| Building Blocks Nursery Limited | Birmingham | 2001 |
| Building Blocks Reablement Limited | Rochford | 2024 |
| Building Blocks SLT Ltd | Haywards Heath | 2023 |
| Building Blocks Therapy Centre Ltd. | Leicester | 2013 |
| Building Blocks Therapy Ltd | Burgess Hill | 2021 |
| Building Bonds Project CIC | Sheffield | 2018 |
| Building Bradford CIC | Bradford | 2025 |
| Building Bree Ltd | Reading | 2025 |
| Building Bricks Coaching Ltd | London | 2023 |
| Building Bridges in Burnley | Burnley | 2005 |
| Building Bridges London Ltd | Rotherham | 2017 |
| Building Bridges Together Ltd | Southport | 2025 |
| Building for the Future Wokingham Limited | Wokingham | 2014 |
| Building Future Minds Ltd | Birmingham | 2024 |
| Building Futures Together (BFT) Integrating Communities CIC | Slough | 2024 |
| Building Health Limited | London | 2006 |
| Building HER... CIC | London | 2025 |
| Building Integrated Health UK Limited | London | 2026 |
| Building Lives (UK) Limited | Birmingham | 2012 |
| Building Lives Project CIC | Chelmsford | 2017 |
| Building Minds CIC | London | 2023 |
| Building Resilience in Children and Communities Limited | Bradford | 2023 |
| Building Young Lives Limited | London | 2020 |