| Bidwai Medical Limited | Liverpool | 2026 |
| Bidwell Practice Limited | Totnes | 2003 |
| Bidyutprava Health Ltd | Kenley | 2023 |
| Biema-British Indian Emergency Medicine Association | Chelmsford | 2019 |
| Bien JN Limited | London | 2014 |
| Bien-Aime Healthcare Ltd | Ruislip | 2025 |
| Bien-Etre Clinical Ltd | Leicester | 2026 |
| Bienestar 360 Ltd | Haverhill | 2018 |
| Bienvenue Supported Housing Services Ltd | Harrow | 2024 |
| Bierley Bradford Limited | Leeds | 2023 |
| Biers Urology Ltd | Lincoln | 2021 |
| Bies Ruchel School CC Limited | Salford | 2024 |
| Bifc-Hub Limited | Okehampton | 2023 |
| Bifit Co. Ltd | Altrincham | 2022 |
| Bifrost Enterprises Ltd | Wembley | 2022 |
| Bifrost Medical Ltd | Shoeburyness | 2024 |
| Bifwa Funeral | London | 2015 |
| Big Aa's Company Limited Ltd | Luton | 2019 |
| Big About Kids CIC | Wigan | 2021 |
| Big Adventures Children's Nursery Ltd | Leicester | 2009 |
| Big BAN Ltd | Basildon | 2018 |
| Big Baraka Limited | Dundee | 2011 |
| Big Bird Care Ltd | Sidcup | 2026 |
| Big Bruv Limited | London | 2016 |
| Big Church Festival Limited | Rustington | 2009 |
| Big Church Live Limited | Rustington | 2013 |
| Big CV Healthcare Ltd | Birmingham | 2022 |
| Big Discoveries Ltd | Waterlooville | 2016 |
| Big Family Daycare Ltd | Kingston Upon Thames | 2022 |
| Big Five Support Services Ltd | Dagenham | 2024 |
| Big Grins Essex Ltd | Shenfield | 2023 |
| Big Hands Little Hands Childcare Limited | Consett | 2015 |
| Big Healthcare Services Ltd | London | 2026 |
| Big Heart Residential Limited | London | 2025 |
| Big Hearts Day Nursery Limited | Sheffield | 2026 |
| Big Hearts Recruitment Ltd | Andover | 2018 |
| Big Herts Care Ltd | London | 2024 |
| Big Hope 4 ALL | Leeds | 2022 |
| Big House Care Limited | Swindon | 2022 |
| Big Ideas Community Interest Company | Luton | 2016 |
| Big Issue Changing Lives C.I.C. | London | 2023 |
| Big Issue North Trust Ltd | Manchester | 1996 |
| Big J Ministry Limited | Rochdale | 2026 |
| Big Life Services Limited | Manchester | 1997 |
| Big Love Foundation | Benfleet | 2015 |
| Big Luke Tattoo Ltd | Studley | 2018 |
| Big MAC Recruitment Limited | Leicester | 2022 |
| Big Muffins Limited | London | 2023 |
| Big N ALL Preschool and Day Nursery Ltd | London | 2022 |
| Big Ocean Therapy Limited | Milton Keynes | 2026 |
| Big Osteopath Limited | Melton Mowbray | 2000 |
| Big Picture Health Protection Ltd | Cambridge | 2023 |
| Big Red Wheel (BRW) Clinical Services Limited | Norwich | 2019 |
| Big Sister Care Limited | Durham | 2025 |
| Big Sky Alpacas and Donkeys CIC | Alford | 2024 |
| Big Sleep Anaesthetic Services Ltd | Belfast | 2025 |
| Big Smile Ltd | Slough | 2019 |
| Big Steps Limited | Leeds | 2013 |
| Big Teeth Ltd | London | 2023 |
| Big Top Buckingham Park Ltd | Northampton | 2022 |
| Big Top LAB Ltd | London | 2024 |
| Big Top Nursery - Roman Park Ltd | Northampton | 2019 |
| Big Top Nursery Limited | Northampton | 2012 |
| Big Valley Group Limited | Leicester | 2017 |
| Big Voices Childcare Services Ltd | Glasgow | 2022 |
| Big Wellies Limited | Dundee | 2003 |
| Big Wide Smile Ltd | Swansea | 2014 |
| Big World Recovery Ltd | Durham | 2024 |
| Big Yellow Door Nursery Limited | Retford | 2020 |
| BIG3GS Ltd. | Reading | 2017 |
| BIG5 Healthcare Ltd | Worcester | 2025 |
| Bigaloe & Co. Ltd | Chigwell | 2011 |
| Bigame Limited | Leicester | 2019 |
| Bigben Care Ltd | Watford | 2021 |
| Bigbenfamilygroup Ltd | Chesterfield | 2024 |
| Bigbolly Limited | Hythe | 2020 |
| Bigbomp Limited | London | 2013 |
| Bigfa Limited | Salisbury | 2025 |
| Bigfirm Limited | Gloucester | 2014 |
| Bigfoot Ltd | Sheffield | 2023 |
| Biggar DP Ltd | Glasgow | 2026 |
| Biggie Smiles Limited | Manchester | 2021 |
| Biggin Hill Community Care Association | Westerham | 1996 |
| Bigginswood Physiotherapy Ltd | Carnforth | 2021 |
| Biggleswade Care Home Development Limited | Slough | 2016 |
| Biggleswade Care Home Limited | Slough | 2016 |
| Biggrin Ltd | Truro | 2019 |
| Biggs Beit Ltd | Dunstable | 2014 |
| Bighand Healthcare Ltd | London | 2019 |
| Bighouse Carers Ltd | Manchester | 2023 |
| Bigils 3A Healthcare Limited | Southampton | 2025 |
| Bigkid Foundation | London | 2008 |
| Bigmama Healthcare Limited | Walsall | 2023 |
| Bigman Johnson Ltd | Basildon | 2025 |
| Bigmath Enterprise Ltd | Harlow, Essex | 2024 |
| Bigprostate Limited | London | 2018 |
| Bigsist Icare Ltd | Ashton-Under-Lyne | 2026 |
| Bigsteps Children Home Ltd | Basildon | 2026 |
| Bigton Collective Ltd | Shetland | 2021 |
| Bigwood Leadership and Development Ltd | Derry | 2025 |