| Boss Hydro Creations Limited | Bishop Auckland | 2019 |
| Boss Industrial Doors Limited | Barnsley | 2023 |
| Boss Msport Ltd | Barnstaple | 2021 |
| Boss of Bosses Global Limited | Lincoln | 2013 |
| Boss Powerboats Ltd | Addlestone | 2009 |
| Boss Social Enterprises Ltd | London | 2022 |
| Boss Status Ltd | London | 2025 |
| Boss Trading Ltd | London | 2023 |
| Boss Trucks Limited | Melton Street Euston Square | 1957 |
| Boss TUP Holdings Limited | Rotherham | 2020 |
| Boss Wiring Ltd | Huntingdon | 2019 |
| Bossa Balloons Limited | Hounslow | 2026 |
| Bossa Brasil Ltd | London | 2025 |
| Bossa London Ltd | London | 2026 |
| Bossa Shoes Limited | Watford | 2023 |
| Bossbespoke Motors Ltd | London | 2026 |
| Bossman Brands Ltd | Gravesend | 2019 |
| Bossman Gems & Jewellery Limited | Barnet | 2011 |
| Bossman Sauces Ltd | Cranbrook | 2025 |
| Bossmittens Ltd | Southam | 2023 |
| Bossnbond Ltd | London | 2025 |
| Bossoms Boatyard Limited | | 1961 |
| Bosswood Limited | Dorchester | 2015 |
| Bost Instruments Group Limited | Cambridge | 2025 |
| Bostec Mechanical Company Limited | London | 2025 |
| Bostik Adhesives Limited | Stafford | 2021 |
| Bostik Limited | Stafford | 1900 |
| Bostin Brews Ltd | West Midlands | 2016 |
| Bostin Hairpins Ltd | Birmingham | 2019 |
| Bostin Watch Company Ltd | Kidderminster | 2025 |
| Bostock Lighting Ltd | Nottingham | 2015 |
| Boston Anorak Company Limited | Boston | 1981 |
| Boston Artisan Holdings Ltd | Ringwood | 2023 |
| Boston Brewery Ltd | Matlock | 2024 |
| Boston Campers Ltd | Boston | 2024 |
| Boston Cartar Ltd | Sheffield | 2023 |
| Boston Creative Limited | Uxbridge | 2003 |
| Boston Design Consultants Limited | Milton Keynes | 2006 |
| Boston Dyers Limited | Leicester | 1984 |
| Boston Engineering Supplies & Services Limited | Boston | 2015 |
| Boston Interiors Limited | Newcastle Under Lyme | 1993 |
| Boston Matthews Limited | Worcester | 1986 |
| Boston Matthews Machinery Limited | Worcester | 1984 |
| Boston Munchy Limited | Diglis | 2002 |
| Boston Sausage | Boston | 2014 |
| Boston Semi Equipment Europe Ltd. | Maidenhead | 2004 |
| Boston Trade Frames Limited | Spilsby | 2004 |
| Bostos Timber Limited | West Midlands, England | 2025 |
| Bostton Limited | London | 2018 |
| Bosun Distillery Ltd | Sherborne | 2021 |
| Bosun Ltd | Smethwick | 2021 |
| Bosun Marine Ltd | Bury St. Edmunds | 2026 |
| Bosun Mechanical Services Ltd | Haywards Heath | 2021 |
| Bosus Engineering Limited | | 2001 |
| Bosus Spares Limited | | 2005 |
| Bosveld Ltd. | Barnstaple | 2023 |
| Boswell & SON (Printers) Limited | Martlesham Heath | 1978 |
| Boswell & SON Limited | Cambridge | 1996 |
| Boswell ROD and Wire Limited | Brierley Hill | 1984 |
| Bosworth Plastics Limited | Hinckley | 1997 |
| Bosworth Wright (Anstey) Limited | Ansey | 1998 |
| BOT FIX Ltd | Manchester | 2026 |
| BOT Rods Ltd | London | 2024 |
| Bota Official Ltd | London | 2023 |
| Botane Elements Ltd | London | 2026 |
| Botane Naturals Limited | Alloa | 2025 |
| Botanibaby Limited | Northallerton | 2025 |
| Botanic Isles Ltd | Glasgow | 2019 |
| Botanica International Limited | Belfast | 2005 |
| Botanica Ireland Ltd | Belfast | 2020 |
| Botanica Limited | Belfast | 2023 |
| Botanical Brothers Drinks Ltd | Manchester | 2020 |
| Botanical Integrity Ltd | London | 2019 |
| Botanical Interior Design Ltd | Nottingham | 2024 |
| Botanical Perfumery Limited | Barnsley | 2026 |
| Botanical Remedies Ltd | Coventry | 2024 |
| Botanical Water Company Limited | London | 2025 |
| Botanicalab Biosciences Ltd | London | 2025 |
| Botanicavitals Ltd | London | 2022 |
| Botaniquo Ltd | Belfast | 2025 |
| Botanu Limited | Suffolk | 2023 |
| Botany Bay Boatyard Limited | Chorley | 2021 |
| Botany to Bottle Limited | Godalming | 2022 |
| Botanyx UK Ltd | London | 2015 |
| Botari Ltd | London | 2026 |
| Botch Sconnet Ltd | Chichester | 2020 |
| Botched Ltd | Truro | 2023 |
| Bote Ltd | Wigan | 2024 |
| Boteane Ltd | London | 2023 |
| Botelai Brewing Company Limited | Bootle | 2023 |
| Botfab Ltd | Halifax | 2022 |
| Bothanna Ltd | Haddington | 2019 |
| Bothongo Hygiene Solutions UK Limited | St. Albans | 2020 |
| Bothwell Biscuit Company Limited | | 2002 |
| Bothwell Chocolate Company Limited | | 2002 |
| Bothy Trading Limited | Angus | 2018 |
| Botivo Ltd | London | 2022 |
| Botl Media Limited | Northwich | 2025 |
| Botley Brewery Ltd | Southampton | 2012 |
| Botley Windscreens Limited | Chipping Norton | 2016 |