| BIO 8 Industrial Ltd | Chesterfield | 2021 |
| BIO Active Pro Limited | London | 2025 |
| BIO Balance Limited | Kington | 2024 |
| BIO Blast Ltd | London | 2019 |
| BIO Blaster Limited | Sunderland | 2020 |
| BIO Bling Ltd | London | 2024 |
| BIO Break Ltd | Coalville | 2025 |
| BIO Buoyance Ltd | London | 2019 |
| BIO Chem Research Ltd. | Glasgow | 1999 |
| BIO Cleansers Limited | Perth | 2019 |
| BIO Construction Materials Ltd | Horsham | 2023 |
| BIO Dermo Ltd | London | 2023 |
| BIO Dose Limited | Fareham | 2020 |
| BIO Engineering Services (Southport) Limited | Preston | 2010 |
| BIO Farm Services Ltd | Llansantffraid | 2025 |
| BIO Farma Ltd | Bolton | 2010 |
| BIO Feed Limited | Lancaster | 2020 |
| BIO Green Foods Limited | London | 2000 |
| BIO Icecream Ltd | Corby | 2018 |
| BIO Innovation Ventures Limited | Wolverhampton | 2025 |
| BIO Living Ltd | Margate | 2025 |
| BIO Media Ltd | Newcastle | 2019 |
| BIO Nova Nutritional Science & Health Management Ltd. | West Midlands, England | 2025 |
| BIO Pergo System Ltd | London | 2021 |
| BIO Pure Technology Ltd | Falmouth | 1998 |
| BIO Support Services Limited | Kettering | 2002 |
| BIO Systems Assure Limited | Swindon | 2017 |
| BIO Technical Limited | Altrincham | 2021 |
| BIO Technics Limited | Liverpool | 1995 |
| BIO Vulcan Limited | Canterbury | 2022 |
| BIO Works Ltd | Trowbridge | 2022 |
| Bio&Me Limited | Chester | 2019 |
| Bio(Hk) Ltd | Manchester | 2023 |
| Bio-Bean Limited | Reading | 2013 |
| Bio-Briq Limited | Crossmaglen | 2018 |
| Bio-Check (UK) Limited | St. Asaph | 2008 |
| Bio-Circle Surface Technology Ltd | Droitwich | 2009 |
| Bio-Clean Equipment Sales Limited | Horley | 1993 |
| Bio-Clean Limited | Horley | 1997 |
| Bio-Flex Yarns Limited | Belfast | 2014 |
| Bio-Functional-Foods.Com | Manchester | 2023 |
| Bio-Health Limited | Lymington | 1981 |
| Bio-Life International Limited | Banbury | 2006 |
| Bio-Logic Science Instruments Ltd | Glossop | 1989 |
| Bio-Productions Limited | East Sussex | 1994 |
| Bio-Rad ABD Serotec Ltd | Kidlington | 1981 |
| Bio-Raze Limited | Crewe | 2022 |
| Bio-Systems Europe Limited | Malvern | 1995 |
| Bio-Tech Lubricants Limited | Southampton | 2014 |
| Bio-Tech Solutions Limited | Driffield | 2002 |
| Bio-Tees Ltd | Burton-On-Trent | 2026 |
| Bio-Tex Ltd | Kirkcaldy | 2025 |
| Bio-Tiful Dairy Limited | Market Drayton | 2012 |
| Bio-World Products Ltd | East Grinstead | 2023 |
| Bioaccess Sales Limited | Chichester | 2019 |
| Bioactive Health Ltd | Godalming | 2018 |
| Bioactive Pharma Ltd | Chichester | 2020 |
| Bioarmor International Ltd | Norwich | 2013 |
| Bioastronautics Ltd | London | 2023 |
| Bioavexia Ltd | Birmingham | 2016 |
| Biobalance Healthcare Limited | Croydon | 2023 |
| Biobax Ltd | Huddersfield | 2019 |
| Biocare Health Ltd | Tunbridge Wells | 2019 |
| Biocare Limited | Redditch | 1985 |
| Biocare UV Limited | Warrington | 2021 |
| Biocatalysts Limited | Cardiff | 1990 |
| Biocell Plastics Ltd | Kington | 2023 |
| Bioceuticals International Ltd | London | 2024 |
| Bioceuticals Limited | London | 2025 |
| Biochar Craft Limited | Ckepstow | 2025 |
| Biochar Manufacturing Ltd | Huntingdon | 2024 |
| Biochef Spares UK Ltd | Lincoln | 2026 |
| Biochrom Limited | Cambridge | 1998 |
| Bioclear Limited | Derby | 2018 |
| Biocold Limited | Edinburgh | 2006 |
| Biocolor Limited | Belfast | 1992 |
| Biocompatibles UK Limited | Weydon Lane Farnham | 2001 |
| Biocomposites Limited | Newcastle | 1996 |
| Biocon Biologics UK PLC | London | 2022 |
| Biocon Pharma UK Limited | London | 2018 |
| Biocontractors Ltd | Stockton-On-Tees | 2024 |
| Biocore Agri Ltd | Blackpool | 2021 |
| Biocore Organics UK Ltd | Fleetwood | 2015 |
| Biocosmedical Holdings Ltd | Newbury | 2022 |
| Biocycle Innovations Ltd | Llandudno Junction | 2019 |
| Biodata Limited | | 1973 |
| Biodeb Group Ltd | Romford | 2013 |
| Biodeg Chemical Co Limited | Liverpool | 1989 |
| Biodent Limited | Shrewsbury, | 2025 |
| Biodigester Products Ltd | Newbury | 2008 |
| Biodiver.City Ltd | Stirling | 2023 |
| Biodiverse Solutions Limited | Plymouth | 2025 |
| Biodome-Systems Ltd | Sawbridgeworth | 2013 |
| Biodrop Ltd | Cambridge | 2012 |
| Biodynamic Wines Ltd | London | 2019 |
| Bioeco Material Ltd | London | 2020 |
| Bioecoplant Ltd | Stirling | 2025 |
| Bioelements Limited | York | 2013 |
| Bioenergy Renewables Limited | London | 2024 |
| Bioenergy Solutions Limited | Stourbridge | 2020 |