| Booling Industrial Co., Ltd | Beckenham | 2014 |
| Boombox Dance Fitness Limited | Bury | 2012 |
| Boomerang IP Ltd | Waltham Abbey | 2019 |
| Boomerang Ltd | Glasgow | 2023 |
| Boomerang Pharmacomms Ltd | London | 2008 |
| Boomex Limited | Bishop Auckland | 2012 |
| Boomlak Limited | Gillingham | 2023 |
| Boomwall Limited | Guildford | 2012 |
| Boormans (Carbis Water) Limited | St. Ives | 2006 |
| Boost Away Ltd | London | 2022 |
| Boost Social Media Ltd | Callington | 2015 |
| Booster Ecommerce Solution Limited | London | 2019 |
| Booster Education Ltd | Cardiff | 2021 |
| Boosung Engineering Co., Ltd. | Kington, | 2013 |
| Boot Tree Limited | Harrogate | 2025 |
| Boote + Co Ltd | Stoke On Trent | 2017 |
| Bootfast Technologies Ltd | Leeds | 2010 |
| Booth Soils and Aggregates Limited | Warrington | 2020 |
| Booth ST Estates Ltd | Manchester | 2016 |
| Booth Ventures Waste (Midlands) Limited | Warrington | 2020 |
| Booth Ventures Waste (North West) Limited | Warrington | 2020 |
| Booth Ventures Waste (Yorkshire) Limited | Warrington | 2020 |
| Boothique Azzies Limited | Kington | 2026 |
| Boothmans (Agriculture) Limited | London | 1975 |
| Bootman Productions Ltd | Turvey | 2018 |
| Boots the Chemists Limited | London | 2007 |
| Booxx Corporation Limited | London | 2023 |
| Booze Jewelry Co., Ltd | Beckenham | 2024 |
| Booze Limited | Harrogate | 2025 |
| Boozedelivered.Com Limited | London | 2010 |
| Boozy DO Limited | Sheffield | 2021 |
| Bopsy Ltd | Glastonbury | 2015 |
| Boquhan Estate (1960) Limited | Glasgow | 2025 |
| BOR1S Limited | Harrogate | 2020 |
| Bora Bora Marine Limited | London | 2015 |
| Boraces GR Limited | London | 2017 |
| Boramir Yachting Ltd | Blackpool | 2023 |
| Borarda Ltd | Bromley | 2024 |
| Boras Malaren Invest Limited | London | 2022 |
| Boras Malaren Limited | London | 2022 |
| Borco Solutions Ltd. | London | 2006 |
| Bordeaux Direct Limited | Theale, Berkshire | 1978 |
| Bordeaux Limited | Harrogate | 2024 |
| Border Aggregates Limited | Lancashire | 1992 |
| Border Barrier Systems Limited | Carlisle | 2021 |
| Border Fastenings Ltd | Nottingham | 2015 |
| Border Fine Arts Company Limited | Lockerbie | 1974 |
| Border Foods Limited | Lanark | 1996 |
| Border Forest Caravan Park Limited | Hexham | 2014 |
| Border IP Two Limited | Carlisle | 2016 |
| Border Nurseries Limited | Pontypool | 2010 |
| Border Property Lettings Limited | Carlisle | 2012 |
| Border Property Maintenance Ltd | Jedburgh | 2008 |
| Border Reivers Tweed Company Limited | Annan | 2020 |
| Border Reprographics Ltd | Nottingham | 2015 |
| Border Show Services Group Limited | Carlisle | 2021 |
| Border Signs Ltd | Nottingham | 2015 |
| Border Trade Services Ltd | Duns | 2020 |
| Border Ventures Limited | Carlisle | 2004 |
| Border Vets Limited | Edinburgh | 2009 |
| Borderbuild Construction Ltd | Monmouth | 2023 |
| Borderfields Limited | Nottingham | 2009 |
| Borderflight Investments Limited | Aylesham Near Canterbury | 2013 |
| Borderflight Properties Ltd | Canterbury | 2013 |
| Borderloos Limited | Carlisle | 2021 |
| Borderville Management Limited | Stamford | 2013 |
| Bordison Memory Company Limited | Manchester | 2017 |
| Borealis Yachting Ltd | Kington | 2025 |
| Boreham Road Residences Limited | Dorset | 2007 |
| Borg Electronics Ltd | Bracknell | 2004 |
| Borgrollswarner (UK) Limited | Sunderland | 2012 |
| Borkwood Development Software Ltd | Manchester | 2015 |
| Borlandland Limited | Glasgow | 2015 |
| Born Alpha Ltd | Exeter | 2023 |
| Born at Home Ltd | West Kirby | 2024 |
| Born Digital Health IP Limited | Newcastle Upon Tyne | 2021 |
| Born Digital Health Research and Innovation Limited | Newcastle Upon Tyne | 2021 |
| Born in Italy Ltd | London | 2014 |
| Born Snooty Limited | Cheltenham | 2011 |
| Born to Run Ltd | Harrogate | 2012 |
| Born-Brands International Ltd | Cirencester | 2020 |
| Borodin Close Management Company Limited | Hampshire | 2000 |
| Borough Homes Limited | Ipswich | 1998 |
| Boroughbridge Brick + Tile Limited | Northallerton | 1987 |
| Boroughbury Garage Limited | Norwich | 1936 |
| Borrans Court Residents Association Limited | Nelson | 1988 |
| Borrow (London) Limited | London | 2014 |
| Borshch Electrical Limited | Birmingham | 2018 |
| Borthwick Group (JMH) Limited | Hartlepool | 2013 |
| Bortomta Entreprenad & Lantbrukstjanst Limited | London | 2016 |
| Bortomta Invest Limited | London | 2016 |
| BOS (Shared Appreciation Mortgages (Scotland) NO.2) Limited | Halifax | 1997 |
| BOS (Shared Appreciation Mortgages (Scotland)) Limited | Halifax | 1996 |
| Bosa Vision Limited | London | 2022 |
| Bosacci Ltd | London | 2022 |
| Bosco & Barney Limited | Bristol | 2025 |
| Bosense International Group Limited | Beckenham | 2014 |
| Bosite Technology Industrial Limited | Gillingham | 2019 |
| Bosky Rider Services Limited | Heanor | 2019 |
| Bosphorus Trio Ltd | London | 2024 |