| Bigbridge Farm Ltd | Cookstown | 2026 |
| Bigby Farms Ltd | Barnetby | 2021 |
| Bigdogbandoguk Ltd | London | 2026 |
| Bigfin Technologies Ltd. | Purley | 2019 |
| Biggar Food Growing Group Community Interest Company | Biggar | 2021 |
| Biggarshiels Carriages Ltd | Biggar | 2006 |
| Biggart Forestry Services Ltd | Carlisle | 2021 |
| Biggin Limited | Corby | 2005 |
| Biggings Farm Limited | Stenness | 2018 |
| Biggleswade & Hitchin AA Limited | St. Neots | 2002 |
| Bighton Hill Limited | Alresford | 2015 |
| Bigthames Business Limited | Burnham-On-Crouch | 2013 |
| Bilan Consultancy Ltd | Derby | 2013 |
| Bilberry Investments Limited | Newton Abbot | 2012 |
| Bilbster Ltd | Wick | 2025 |
| Bill Hurcomb Scanning Limited | Stranraer | 2012 |
| Bill Mccann Limited | Chorley | 2003 |
| Bill Young Agriculture Ltd | Warwick | 2024 |
| Billericay Doggy Day Care Ltd | Canvey Island | 2025 |
| Billingbear Farm Limited | Bracknell | 2007 |
| Billingford Farms Limited | London | 2018 |
| Billingford Lakes Limited | Dereham | 2018 |
| Billingham Manor Estate Ltd | Newport | 2025 |
| Billingsmoor Farm Limited | Bedford | 2011 |
| Billington Farming Limited | Macclesfield | 2013 |
| Billington Farms Limited | Wrexham | 2021 |
| Billington Mushroom Farms Ltd | London | 2025 |
| Billington Sheep Farmers Limited | Brentwood | 2011 |
| Billington Stud Farms Limited | Wrexham | 2021 |
| Billockby Farms Limited | Great Yarmouth | 1961 |
| Bills Farm Services Limited | Leicestershire | 2007 |
| Billy-Frank Matcham Limited | Margate | 2022 |
| Bilting Grange Limited | Faversham | 2009 |
| BIN Marra Falcons Limited | Uxbridge | 2026 |
| Binas Barkin Beauties Limited | Dinas Powys | 2024 |
| Binchester Enterprises Community Interest Company | Bishop Auckland | 2018 |
| Bindis Lost and Found Pets CIC | Frodsham | 2020 |
| Bindon Estates Limited | Nr Seaton | 2012 |
| Bindon Farming Limited | Nr Seaton | 2022 |
| Bindon Land Limited | London | 2026 |
| Bindwell Limited | North Walsham | 1990 |
| Bingham Farms Limited | Derry | 2025 |
| Binks Nurseries Limited | Middlesbrough | 2001 |
| Binn Agricultural Limited | Edinburgh | 2015 |
| Binn Farm Limited | Edinburgh | 1981 |
| Binnian Fishing Ltd | Newry | 2017 |
| Binns Rainbow Trading Limited | Liverpool | 2015 |
| Binscarth Limited | Orkney | 2003 |
| Binsted Farms Limited | Lewes | 1957 |
| BIO 8 Ltd | Chesterfield | 2006 |
| BIO Agriculture Limited | Colerne | 2021 |
| BIO Carbonics Limited | Lincoln | 2018 |
| BIO Dermatic Laboratory for Pharmaceutical Trade and Distribution Ltd | London | 2025 |
| BIO Earth Ltd | London | 2017 |
| BIO Enterprise Ltd | Manchester | 2020 |
| BIO Recycling Solutions Limited | Morpeth | 2002 |
| BIO Zoetic Ltd | London | 2025 |
| Bio-Fert Wales Ltd | Denbigh | 2013 |
| Bioagrimed (Consultancy) Limited | Devizes | 2012 |
| Bioaqua:Farm Limited | Wedmore | 2012 |
| Biobright Ltd | Buckhurst Hill | 2021 |
| Biocare Sciences Limited | London | 2025 |
| Biocell Agri Limited | Carlisle | 2003 |
| Biochar Energy Sustainable Technologies PTY Ltd | London | 2022 |
| Biochar Innovations Limited | Halifax | 2022 |
| Biochar Ltd | Bromyard | 2018 |
| Biocharuk Ltd | Pencombe | 2018 |
| Biodemeter Limited | Canterbury | 2021 |
| Biodiverse Britain Ltd | London | 2023 |
| Biodiversity and Carbon Network Ltd | Ingatestone | 2023 |
| Biodiversity and Habitat Solutions Limited | Ashford | 2023 |
| Biodiversity NET Gain East Anglia Ltd | Norwich | 2024 |
| Bioemitters Ltd | Lochgilphead | 2012 |
| Bioenergy Crops Ltd | London | 2012 |
| Bioenergy Reforestation Partners Ltd | London | 2024 |
| Biofly Ltd | Boston | 2024 |
| Biogrow Limited | Worcester | 2019 |
| Biohybrids International Limited | Berkshire | 1996 |
| Biolevel Limited | Chipping Norton | 2016 |
| Bioline Agrosciences Limited | Little Clacton | 1988 |
| Biologic Design Limited | Stourport-On-Severn | 1999 |
| Biomass Heating Supplies Limited | Beaconsfield | 2014 |
| Biome Algae Ltd | Totnes | 2018 |
| Biomeasurements Limited | Shefford | 2005 |
| Biophillic Swansea Ltd | Swansea | 2024 |
| Bioregional Forestry Limited | Horley | 2010 |
| Bioresources Limited | Salisbury | 2019 |
| Bios Rural Limited | Haywards Heath | 2025 |
| Bioscapes Limited | Aberdeen | 1982 |
| Biosphere Organics Limited | Hereford | 2005 |
| Biostar Limited | York | 1984 |
| Biothread Limited | Chipping Norton | 2023 |
| Bioveg Oils & Fuels International Corporation Limited | London | 2008 |
| Bioyieldcare Limited | Shipley | 2025 |
| Birch Farm Limited | Crediton | 2005 |
| Birch Farms (Heywood) Limited | Heywood | 1963 |
| Birch Hall Farming Limited | Ellesmere | 2024 |
| Birch Hill Limited | Stockton-On-Tees | 2019 |
| Birch House (Potatoes) Limited | Brailsford | 1994 |
| Birch L & L Ltd | Skegness | 2025 |