| Bestandery Limited | Luton | 2019 |
| Bestar Co., Ltd | Cambridge | 2024 |
| Bestevenn Limited | Sudbury | 2020 |
| Bestfoxcall Limited | Ledbury | 2014 |
| Besthorpe Cattle Company Limited | Newark | 1994 |
| Bestone Services Ltd | Ilford | 2024 |
| Besttway Limited | Cardiff | 2018 |
| Beswick Brothers Bloodstock Ltd | Holywell | 2019 |
| Beswicks View Ltd | Crewe | 2026 |
| Beth Normandale Ltd | Scarborough | 2023 |
| Bethell Racing Ltd | Leyburn | 2025 |
| Betley Court Farm Partnership Limited | Crewe | 2016 |
| Betsie and Co Petsitting Ltd | London | 2023 |
| Better Cattle Company Ltd | Middlesbrough | 2019 |
| Better Origin Holdings Limited | London | 2026 |
| Betteshanger Farms Limited | Deal | 1956 |
| Bettina Nursery Ltd | Roydon | 2011 |
| Betts Farm & Property Management Limited | Wallingford | 1978 |
| Bettys Mini Doodles Ltd | Whitchurch | 2019 |
| Betula (Geotech) Ltd | Blairgowrie | 2015 |
| Beulah Sire Reference Co. Ltd. | Aberystwyth | 1997 |
| Beulah Trading Limited | Liverpool | 2015 |
| Beverley Butchers Limited | Beverley | 1974 |
| Bevernbridge Farm Limited | Brighton | 2018 |
| Bevernbridge Stables Limited | Brighton | 2007 |
| Bevima Ltd | Luton | 2025 |
| Bewitching Wind Farm Ltd | Pontypool | 2023 |
| Bexley Land Restoration Limited | Stanford In The Vale | 1990 |
| Bexleyhill Limited | Penryn | 2009 |
| Bexminster Limited | Aldermaston | 1978 |
| Beyond Carbon Ltd | Exeter | 2022 |
| Beyond Carbon Pioneers Limited | London | 2025 |
| Beyond Design Limited | Sturminster Newton | 1993 |
| Beyond Karbon Ltd | Maidstone | 2025 |
| Beyond Trees Ltd | Bristol | 2016 |
| Beyondtropics Ltd | Forest Row | 2024 |
| Bezinvest Ltd | Lyndhurst | 2023 |
| BF Farm Ltd | Carlisle | 2023 |
| BFC Agronomy Ltd | Creaton | 2012 |
| Bfdf Ltd | Omagh | 2018 |
| BFF Group Ltd | Sleaford | 2023 |
| BG & SON Fish & Game Ltd | Fraserburgh | 2019 |
| BG Garden Centre Limited | Eastleigh | 2025 |
| Bgdt Limited | Bolton | 2008 |
| BGF Farming Ltd | Market Rasen | 2022 |
| BH & C AG Ltd | South Yorkshire | 2024 |
| BH Bullyz Ltd | Bournemouth | 2021 |
| BH Equestrian Ltd | Oswestry | 2025 |
| BH Trading Ltd | Donaghmore | 2016 |
| Bhaggo Limited | Ilford | 2004 |
| Bhaktivedanta Manor Limited | Aldenham | 2008 |
| BHE Agricultural Contractors Ltd | York | 2002 |
| BHF Bakes Ltd | Greenford | 2025 |
| BHF Poultry Limited | Eye | 2018 |
| BHI Farming Limited | Cirencester | 2020 |
| Bhmc Enterprises Limited | Clogher | 2002 |
| BHP Bees Ltd | Buckingham | 2025 |
| BHP Equestrian Ltd | Ashbourne | 2021 |
| BHP Queens Ltd | Buckingham | 2020 |
| BHR Resources Limited | Cheltenham | 2017 |
| Biba-Dushi Ltd | Banff | 2018 |
| Bicester Tree Services Ltd. | Bicester | 2015 |
| Bichonlove Puppy Rescue CIC | Warrington | 2022 |
| Bickenhall Farms Ltd | Taunton | 2020 |
| Bickerstaff Fishing Company Limited | Brighton | 2003 |
| Bickerston Farm Limited | Norwich | 1999 |
| Bickerton Beekeeping Limited | London | 2022 |
| Bickners Farm Limited | Great Dunmow | 1968 |
| Bicknor Wood Residents Community Group Ltd | Aylesford | 2020 |
| Bickton Estate FLY Fishing Club Limited | Godalming | 2015 |
| Bicton Farms Limited | Milford Haven | 2003 |
| Bicyclenation for Communities CIC | London | 2020 |
| Bidcarbon Foundation | London | 2023 |
| Biddenden Arboriculture Limited | Whitstable | 2022 |
| Biddenfield Estate Management Limited | Southampton | 2014 |
| Biddestone Stud Ltd | Malmesbury | 2009 |
| Biddick Contractors Ltd | Cornwall | 2013 |
| Bidwell & Dart: Growing Ecological Roots CIC | Totnes | 2024 |
| Biegun Agricultural Limited | Grimsby | 2012 |
| Bielgrange Ltd | Kelso | 2018 |
| Biewerbay Ltd | Dunstable | 2021 |
| Big Bear Doggy Day Care & Home Boarding Ltd | Nottingham | 2023 |
| Big Bear Limited | Braintree | 2021 |
| Big Bloomers Ltd | Salisbury | 2026 |
| Big Brother Trade Ltd | Bury St. Edmunds | 2024 |
| Big Bully UK Limited | Milton Keynes | 2017 |
| Big Fish Farm Community Interest Company | Carterton | 2024 |
| Big Game Hunting & Safari Ltd | Winsford | 2025 |
| Big Kelp Ltd | London | 2023 |
| Big Longborough Farm Ltd | St. Helens | 2023 |
| Big Meadow CSA Ltd | Swansea | 2022 |
| Big Nippers Limited | Great Yarmouth | 2016 |
| Big Red Blacksmiths Ltd | Kirkliston | 2019 |
| Big Red Retrievers Ltd | Wigan | 2025 |
| Big Sky Technical Consultancy Ltd | Swansea | 2024 |
| Big South Bullys Ltd | Waterlooville | 2020 |
| Big Trees Limited | Stockport | 2014 |
| Big Wood Fisheries Limited | Norwich | 2009 |
| BIG5IVE Ltd | Stoke-On-Trent | 2025 |
| Bigbens Landscaping Ltd | Milton Keynes | 2026 |