| Bioextractions Wales Limited | Tredegar | 2013 |
| Biofare Investments Limited | Newbury | 2011 |
| Bioffenics Ltd | Blackwood | 2024 |
| Biofibre Solutions Limited | London | 2025 |
| Biofix Ltd | Ringwood | 2021 |
| Bioforce N.E Ltd | Middlesbrough | 2014 |
| Bioforms Ltd | London | 2023 |
| Biofortuna Limited | Deeside | 2008 |
| Biofresh Cosmos Ltd | London | 2016 |
| Bioftech Ltd | London | 2024 |
| Biofuel International Group Limited | London | 2023 |
| Biofynder Limited | Southampton | 2025 |
| Biogas Products Limited | Brierley Hill | 2008 |
| Biogas Technology Limited | Salford Quays | 1988 |
| Biogen X Pharmaceutical Ltd | London | 2025 |
| Biogrid Omagh | Omagh | 2015 |
| Bioguard Biotech Ltd | Middlesbrough | 2025 |
| Bioguru Ltd | Reading | 2020 |
| Bioha Laboratories Group Ltd | Pontypridd | 2015 |
| Biohabit Ltd | Liverpool | 2019 |
| Biohack Supplements Ltd | London | 2025 |
| Bioharv Ltd | London | 2024 |
| Biohazard Candy Ltd | Littlehampton | 2021 |
| Bioheal Ltd | Belfast | 2019 |
| Biohealth Technology Ltd | London | 2022 |
| Bioherb Food Supplements Trading Ltd | Manchester | 2025 |
| Biohorizons Camlog UK & Ireland Ltd | Bracknell | 2018 |
| Biohybrid Devices Limited | Bristol | 2024 |
| Biointegrated Medical Service Limited | London | 2019 |
| Biokinetic Labs Limited | Sunderland | 2026 |
| Biokinetics Limited | Holywell | 2002 |
| Biolab Systems Ltd | Camberley | 2025 |
| Biolacuna Holdco 4 Ltd | Wantage | 2025 |
| Biolin Scientific Limited | Manchester | 1983 |
| Bioline Reagents Limited | London | 2003 |
| Biolitica Scientific Ltd | Stockport | 2022 |
| Biologic Technologies Limited | Fordham | 2019 |
| Biologics Consulting Ltd | London | 2025 |
| Biologix Laboratories Limited | Ely | 2002 |
| Bioloop Systems Ltd | Warrington | 2026 |
| Biolope Limited | Mirfield | 2005 |
| Bioman Services Limited | Cardiff | 2012 |
| Biomar Limited | Grangemouth | 1989 |
| Biomass Boiler Services Limited | Berwick Upon Tweed | 2010 |
| Biomass Engineers Ltd | Exmouth | 2022 |
| Biomass Woodchip Limited | Ormskirk | 2016 |
| Biomassters (UK) Ltd | Kington | 2022 |
| Biomaterial Pioneer Ltd | St. Albans | 2023 |
| Biome Bioplastics Limited | Marchwood | 2002 |
| Biome Limited | Egham | 2003 |
| Biome Lube Ltd | Kingston Upon Thames | 2025 |
| Biome Plants Ltd | Cheltenham | 2020 |
| Biomech Studio Ltd | London | 2026 |
| Biomechanica Limited | Nottingham | 2024 |
| Biomed Group Ltd | London | 2025 |
| Biomed Medical Devices Limited | Milton Keynes | 2023 |
| Biomed Supplies Limited | Taunton | 2004 |
| Biomedical Research Analytics Ltd | London | 2026 |
| Biomerieux UK Limited | Basingstoke | 1972 |
| Biomet UK Limited | South Wales | 1971 |
| Biometrics Limited | Newport | 1997 |
| Biomimicry Gaia Ltd | Chislehurst | 2023 |
| Biomin Technologies Limited | London | 2014 |
| Biomixer Limited | Alcester | 2025 |
| Biomotors Limited | Maidstone | 2005 |
| Biomr Limited | London | 2023 |
| Bion Corporation Limited | London | 2012 |
| Bionacom Ltd | Coventry | 2011 |
| Bionaid Ltd | Gateshead | 2022 |
| Bionano Health and Medical Device Limited | Enfield | 2025 |
| Bionet Research Limited | Camelford | 1988 |
| Bionexa Limited | Wigan | 2025 |
| Bionic Mosquito Limited | Darlington | 2025 |
| Bionic Plants Ltd | London | 2024 |
| Bionica Systems Ltd | London | 2017 |
| Bionome UK Limited | London | 2023 |
| Bionova Scientific Ltd | London | 2024 |
| Biont International Ltd. | London | 2024 |
| Biontech UK Limited | London | 2020 |
| Bionutri Limited | Birmingham | 1990 |
| Biopanda Reagents Ltd | Belfast | 2013 |
| Biopanel Systems Limited | Halifax | 2014 |
| Biopax Limited | Belfast | 2018 |
| Biopaxium Technologies Limited | Watford | 2014 |
| Biopercept Ltd | Preston | 2017 |
| Biopets Ltd | Accrington | 2017 |
| Biopharm (U.K.) Limited | Hendy | 1983 |
| Biopharma Laboratories (UK) Limited | Hertford | 2007 |
| Biopharma Stability Testing Laboratory Limited | Nottingham | 2012 |
| Biophilica Ltd | Mitcham | 2019 |
| Bioplastuk Ltd | Cambridge | 2025 |
| Bioplus Ltd | Bury St. Edmunds | 2023 |
| Biopolymers Limited | London | 2022 |
| Bioponics Ltd | Malvern | 2021 |
| Biopower Engineering Limited | Milton Keynes | 2022 |
| Biopower Technologies Limited | Milton Keynes | 2013 |
| Biopro Solutions Ltd | St Leonards On Sea | 2025 |
| Bioprocess Ltd | Ware | 2022 |
| Bioprojet UK Limited | Salisbury | 2000 |
| Biopunch Ltd | Bingham | 2017 |