| BNW (Scotland) Limited | Aberdeenshire | 2000 |
| BNW Injection Moulding Limited | Sandy | 2025 |
| BNW Ltd | Fleet | 2017 |
| Bnworks Leeds Ltd | Leeds | 2019 |
| BNZ Pastry Ltd | London | 2024 |
| BO Craft 1995 Ltd | Hayes | 2022 |
| BO Peeps Sheperds Huts Ltd | Newtown | 2017 |
| BO Shuo Investments Ltd | Beckenham | 2024 |
| BO Tree Farm Ltd | Perth | 2014 |
| BO Visuals Ltd | London | 2022 |
| Bo-Dahab Tmas Ltd | London | 2019 |
| Bo-Mac (Sheffield) Limited | Sheffield | 1979 |
| BO5 UK Limited | Ilford | 2011 |
| BOA (UK) Limited | Tonbridge | 1994 |
| BOA Brewing Company Ltd | Stourport-On-Severn | 2023 |
| BOA Engineering Limited | Berkshire | 2007 |
| BOA Garms Ltd | London | 2018 |
| BOA Sheetmetal Products Limited | Lidlington | 2009 |
| BOA Style Limited | Tonbridge | 2000 |
| BOA Tool Company Ltd | Tonbridge | 2000 |
| BOA Wool Limited | Bruton | 2017 |
| Boab (UK) Limited | Douglas | 2006 |
| Boag Traders Fabrications Ltd | Hartlepool | 2018 |
| Boal U.K. Limited | Loughborough | 1987 |
| Boam Joinery Limited | Nottingham | 2010 |
| Board - Walker Ltd | London | 2024 |
| Board Brothers Collective Ltd | Farnborough | 2025 |
| Board Game BUD Ltd | Burnham-On-Sea | 2020 |
| Board Services Ltd | Leeds | 2009 |
| Board&Bloom Ltd | Bristol | 2023 |
| Boardcraft Limited | St. Neots | 1997 |
| Boarder Ltd | London | 2026 |
| Boardgame Changer Ltd | High Wycombe | 2025 |
| Boardland Ltd | London | 2018 |
| Boardley & Brewer Limited | Dorking | 2001 |
| Boardley and Roberts Limited | Ipswich | 1975 |
| Boardlight Limited | Ferndown | 2020 |
| Boardlink Limited | Manchester | 1969 |
| Boardman Bikes Ltd | Redditch | 2005 |
| Boardman International Limited | Redditch | 2006 |
| Boardman Transformers Limited | Ulverston | 1959 |
| BOARDS-4U Limited | Wakefield | 2022 |
| Boardsortuk Ltd | Whitley Bay | 2026 |
| Boardtek Limited | Pontefract | 2007 |
| Boardwalk Records Inc Limited | London | 2016 |
| Boarstall Meats Limited | Chippenham | 2023 |
| Boas Joinery Ltd | Newark | 2022 |
| Boastful Ltd | Abingdon | 2024 |
| Boat Autobody Works Ltd | Tilbury | 2024 |
| Boat Club Trafalgar Limited | Bournemouth | 2018 |
| Boat Electrics & Electronics Limited | Irvine | 1978 |
| Boat Factory Ltd | Mirfield | 2023 |
| Boat Haven Marine Services Ltd | Ely | 2024 |
| Boat Life Electrics Ltd | Portsmouth | 2025 |
| Boat Mate Limited | Shepperton | 2005 |
| Boat on a Rope Limited | Ashford | 2025 |
| Boat Painting by Edward Limited | Burton-On-Trent | 2022 |
| Boat Parts Direct Ltd | Plymouth | 2021 |
| Boat People Sauce Ltd | Welling | 2021 |
| Boat Projects Ltd | Winchester | 2024 |
| Boat Renovations Ltd | Cambridge | 2023 |
| Boat Repair Centre Ltd | Portishead | 2026 |
| Boat Sales Southwest Ltd | Torpoint | 2023 |
| Boat Spa Ltd | Leyland | 2023 |
| Boat Tech Ltd | Southampton | 2020 |
| Boat Windows Limited | Blandford Forum | 2018 |
| Boat Yard Services (River Hamble) Ltd | Southampton | 2019 |
| Boat-House Interiors Ltd | Poole | 2020 |
| Boatcare Marine Limited | Southampton | 2025 |
| Boatcare Sussex Ltd | Brighton | 2021 |
| Boatco UK Ltd | Rochford | 2014 |
| Boatcraft Ltd | Ardrossan | 2010 |
| Boateek Ltd | New Milton | 2023 |
| Boatfield FLY Fishing Ltd | Harrogate | 2022 |
| Boathouse Kitchen Ltd | Cranbrook | 2020 |
| Boathouse Machine Company Limited | Cleveland | 2012 |
| Boatie Ltd | Havant | 2025 |
| Boating Leisure Services Limited | Canvey Island | 2013 |
| Boatingbuddy Marine Services Limited | Chichester | 2019 |
| Boatman Furniture Limited | Rochdale | 2025 |
| Boatman Mechanical Services Limited | London | 1998 |
| Boatnovic Ltd | London | 2025 |
| Boats Already Ltd | Southampton | 2020 |
| Boats Hydraulics Ltd | Plymouth | 2022 |
| Boats Limited | Nr. Rochford | 2003 |
| Boatserv Ltd | Ely | 2019 |
| Boatsos Ltd | London | 2026 |
| Boatspeed Ltd | Cambridge | 2018 |
| Boatta (UK) Limited | London | 2003 |
| Boatwork Limited | Central Park | 2012 |
| Boatworkers Ltd | London | 2025 |
| Boatwright Services Limited | Colchester | 2012 |
| Boaty Bits Ltd | Twickenham | 2021 |
| Boazclairs Autos Ltd | London | 2025 |
| BOB & Mouse Ltd | Ipswich | 2022 |
| BOB Air Ltd | Leamington Spa | 2024 |
| BOB Beck Fuel Injection Limited | Leamington Spa | 2016 |
| BOB Cave Supplies and Services Limited | Newport | 1999 |
| BOB Crooks First Glass Limited | Crediton | 2004 |
| BOB Dawson Steam Plant Services Limited | Barking | 2025 |