| Borderless Theatre Ltd | London | 2026 |
| Borderless Works Ltd | London | 2024 |
| Borderline Athletics Ltd | Kelso | 2023 |
| Borderline Events Ltd | Belfast | 2025 |
| Borderline Greenway CIC | Gateshead | 2021 |
| Borderlines Festival CIC | Carlisle | 2021 |
| Borders (Milfield) Gliding Club Limited(The) | Wooler | 1970 |
| Borders Book Festival | Melrose | 2006 |
| Borders Pottery C.I.C. | Eyemouth | 2021 |
| Borders School of Dance Limited | Lancaster | 2024 |
| Borders Sport and Leisure Enterprises Limited | Melrose | 2003 |
| Borealis Theatre Limited | London | 2007 |
| Boreham Wood Football Club (Utilities) Limited | Derby | 1963 |
| Boreham Wood Football Club Limited | Borehamwood | 1990 |
| Borehamwood 2000 FC Limited | Borehamwood | 2015 |
| Borehamwood Youth Football Club Limited | Borehamwood | 2006 |
| Boris Fitness Ltd | Suffolk | 2023 |
| Borkertas Events Ltd | Grantham | 2025 |
| Born 2 BE Free Ltd | Barnet | 2025 |
| Born 2 Boogie Ltd | Borehamwood | 2024 |
| Born 2 Bounce Ltd | Ashton-Under-Lyne | 2021 |
| Born 2 Dance Limited | Lancaster | 2023 |
| Born 2 Reform Ltd | Northampton | 2026 |
| Born 2 Run Events Ltd | Newcastle | 2012 |
| Born Again Bottles CIC | Honiton | 2024 |
| Born Again Concerts Limited | Abingdon | 2018 |
| Born Again Today Limited | Ashford | 2023 |
| Born Artistic to Achieve Ltd | Ipswich | 2023 |
| Born Athlete Ltd | Lincoln | 2025 |
| Born Lagree Limited | London | 2024 |
| Born Lucky Competitions Ltd | London | 2025 |
| Born Maverick Interactive Ltd | Bangor | 2024 |
| Born N Bread Ltd | London | 2014 |
| Born Survivor Events Limited | Preston | 2018 |
| Born This Way Media Ltd | London | 2020 |
| Born to BE Live Ltd | Stockport | 2012 |
| Born to Party Ltd | Derby | 2021 |
| Born to Perform College Ltd | Derby | 2024 |
| Born to Perform Events Limited | Derby | 2023 |
| Born to Train Ltd | Bedford | 2013 |
| Born to WIN Jackpot Ltd | Chatham | 2026 |
| Born Twice Ltd | Market Deeping | 2025 |
| Born Ugly Associates Limited | Leeds | 2020 |
| Born Ugly Limited | Leeds | 1994 |
| Born Wild Media Limited | London | 2017 |
| Born With Horns Tattoo Ltd | Northampton | 2022 |
| Born::Free LDN Ltd | London | 2020 |
| Bornballers Limited | Sheffield | 2022 |
| Borne Events Ltd | Leicester | 2023 |
| Borne Fitness Ltd | High Wycombe | 2024 |
| Borneo Orangutan Survival UK | London | 2011 |
| Bornready Academy Athletics Ltd | Erith | 2024 |
| Boro FC Comm Ltd | Farnborough | 2022 |
| Boro FC Social Limited | Farnborough | 2016 |
| Boro FC. Ltd | Farnborough | 2013 |
| Boro Leisure Limited | Nuneaton | 2008 |
| Boro Theatrical Experiences Ltd | London | 2024 |
| Borosko Ltd. | Warrington | 2017 |
| Borough 19 Motor Club Limited | Herne Bay | 1987 |
| Borough Green Junior FC Limited | Folkestone | 2014 |
| Borough of Barnsley Swimming Club Limited | Barnsley | 2026 |
| Borough of Havant Sport and Leisure Trust | Havant | 1997 |
| Boroughmuir Bears Ltd | Edinburgh | 2018 |
| Boroughmuir Limited | Edinburgh | 2012 |
| Boroughmuir Rugby & Community Sports Club | Edinburgh | 2012 |
| Boroughmuir Rugby Football Club Limited | Edinburgh | 1996 |
| Boroughmuir Thistle Football Club Ltd | Edinburgh | 2024 |
| Borrowash Victoria AFC Limited | Derby | 2026 |
| Borrowash Victoria Holdings Ltd | Derby | 2025 |
| Bort Kincaid Ltd | London | 2023 |
| Borth and Ynyslas Golf Club (Trading) Limited | Aberystwyth | 2023 |
| Borth and Ynyslas Golf Club,Limited(The) | Aberystwyth | 1912 |
| Borthers Limited | Altrincham | 2005 |
| Borthwick Games Limited | London | 2026 |
| Borussia London FC Ltd | Epsom | 2023 |
| BOS Academy Ltd | Hull | 2021 |
| Bosbun Limited | London | 2018 |
| Boscombe Down Aviation Collection Limited | Salisbury | 2007 |
| Bosh Comp Limited | Chichester | 2026 |
| Bosh Draws Ltd | North Weald | 2026 |
| Bosh Padel Club Ltd | Manchester | 2026 |
| Bosham Sailing Club Limited | Chichester | 1992 |
| Boshpro Limited | Nottingham | 2025 |
| Bosloe's Creative Chaos Ltd | Banbury | 2024 |
| Boss Acting School Ltd | London | 2020 |
| Boss Exclusive Limited | Horsham | 2017 |
| Boss Fit Ltd | London | 2023 |
| Boss Fitness Limited | Durham | 2018 |
| Boss Gang Touring Limited | Edinburgh | 2026 |
| Boss Gym Ltd | Hollinwood | 2020 |
| Boss Gym Magherafelt Ltd | Magherafelt | 2024 |
| Boss Key Ltd | Witham | 2022 |
| Boss Morris Ltd | Stroud | 2025 |
| Boss My List Limited | Longfield | 2019 |
| Boss Talent Limited | London | 2018 |
| Boss Talent Sports Limited | Morden | 2023 |
| Bossa DOS Patos Ltd | Stockport | 2025 |
| Bosscrowns Film and Drama School | Barking | 2015 |
| Bosscrowns Productions Ltd | London | 2004 |
| Bosse & Baum Limited | London | 2013 |