| Buckhouse Holdings Limited | London | 2025 |
| Buckhurst Group (Holdings) Ltd | Bury | 2018 |
| Buckhurst Property Group Ltd | Llantwit Major | 2022 |
| Buckie Walsh Limited | Bicester | 2022 |
| Buckingham Asset Finance Limited | Pinner | 2022 |
| Buckingham Bridgefinance Corp Ltd | Beckenham | 2012 |
| Buckingham Finance Group Limited | Birmingham | 2025 |
| Buckingham Flooring Holdings Limited | Buckingham | 2023 |
| Buckingham Insurance Consultants Limited | Chesterfield | 1983 |
| Buckingham James Financial Services Limited | Brentwood | 2012 |
| Buckingham Mortgage Services Limited | Hayes | 2003 |
| Buckingham Research and Consultancy Limited | Moreton-In-Marsh | 2025 |
| Buckinghamshire Argyll Acquisitions Ltd | Milton Keynes | 2025 |
| Buckland Capital Partners Limited | Winchester | 2007 |
| Buckland Care (Holdings) Limited | Poole | 2012 |
| Buckland Civil Engineering Ltd | Reading | 2012 |
| Buckland Group Holdings Ltd | Cwmbran | 2025 |
| Buckland Ventures Limited | Woodbridge | 2024 |
| Buckle & Partners Limited | Surrey | 1997 |
| Buckle Enterprises | Chester | 2020 |
| Buckle Group Limited | Hull | 2020 |
| Buckle Invest Limited | Huddersfield | 2018 |
| Buckle Management & Holdings Limited | Chadwell Heath | 1967 |
| Bucklebury Management Limited | Reading | 2021 |
| Bucklers Hard Holdings Ltd | London | 2025 |
| Bucklers of London Limited | Solihull | 2025 |
| Bucklewell Holdings Limited | Oswestry | 2025 |
| Buckley & Co Financial Services Limited | Exeter | 2009 |
| Buckley & Lovell Ltd | Beccles | 2022 |
| Buckley Acquisitions Limited | Bolton | 2022 |
| Buckley and Buckley Ltd | Bovey Tracey | 2019 |
| Buckley Financial Services Limited | Nottingham | 2022 |
| Buckley Holding Company Limited | Nottingham | 2013 |
| Buckley Holdings NE Limited | Newton Aycliffe | 2026 |
| Buckley Watson Holdings Limited | Leigh-On-Sea | 2025 |
| Buckley Wealth Limited | St Albans | 2010 |
| Buckley Whitmoor-Pryer Tracey House Ltd | Poole | 2025 |
| Buckley-Ross Holdings Ltd | Altrincham | 2025 |
| Buckmaster Associates (U.K) Ltd | Canvey Island | 2017 |
| Buckmaster Investments Limited | Kettering | 2021 |
| Buckminster Bidco Limited | London | 2026 |
| Buckmore Park Holdings Limited | Chatham | 2019 |
| Bucknall Counselling and Collection Services Ltd | Nottinghamshire | 2006 |
| Bucks Asset Finance Limited | Milton Keynes | 2007 |
| Bucks Land & Estates Limited | Brackley | 2025 |
| Buckshaw Bunnies Childcare Holdings Ltd | Nottingham | 2026 |
| Buckshaw Financial Services Limited | Chorley | 2008 |
| Buckshot Group Limited | Goole | 2024 |
| Buckstone Limited | Exeter | 2024 |
| Buckstrybe Limited | Nottingham | 2024 |
| Buckthorn Corporate Limited | London | 2013 |
| Buckton Holdings Limited | London | 1981 |
| Buckworth Zephyr Limited | London | 2024 |
| Buckzy Payments Limited | London | 2019 |
| BUD Black Limited | London | 2026 |
| BUD Funding Limited | Basildon | 2020 |
| Buda Holdings Ltd | Birmingham | 2021 |
| Budacove Holdings Limited | Coventry | 2024 |
| Budai Consulting Ltd | East Grinstead | 2022 |
| Budd Holdings Limited | King'S Lynn | 2022 |
| Budd London Holding Company Limited | Pinner | 2021 |
| BUDD5 Ltd | Portsmouth | 2022 |
| Budden Holding Company Limited | Southampton | 2024 |
| Budden Services Ltd | Turriff | 2020 |
| Buddha Box Holdings Limited | London | 2019 |
| Buddha Group Ltd | Plymouth | 2022 |
| Buddha International Trustees Limited | Hounslow | 2021 |
| Buddha Mortgage Limited | Hayes | 2025 |
| Buddhas Tree EOT Limited | Manchester | 2023 |
| Buddies Holdings Limited | Bishop Auckland | 2026 |
| Budding Learners Holdco Limited | Edgware | 2024 |
| Buddle Nurseries Ltd | Stoke-On-Trent | 2020 |
| Buddleford AD Ltd | Newton Abbot | 2025 |
| Buddscapital Limited | London | 2025 |
| Buddy Apple Holdings Limited | Canterbury | 2025 |
| Buddy Finance Limited | London | 2017 |
| Buddy Investments | London | 2017 |
| Buddy Towers Limited | London | 2024 |
| Buddyrock Limited | London | 2023 |
| Budge (Holdings) Limited | North Yorkshire | 2004 |
| Budge and Company Limited | North Yorkshire | 1974 |
| Budget Carpet Holdings Limited | Swansea | 2021 |
| Budget Mortgages Ltd | London | 2021 |
| Budget Trading Limited | Manchester | 2007 |
| Budget Waste Management Limited | Evesham | 2026 |
| Budget Workspace Holdings Limited | Rowlands Gill | 2015 |
| Budgethero Ltd. | London | 2025 |
| Budiam Consulting Limited | Epsom | 2017 |
| Budisteanu Construction Ltd | Barking | 2026 |
| Budle Bay Holdings Limited | Morpeth | 2022 |
| Budoc Investments Limited | London | 2021 |
| Budstar Limited | Oxford | 2010 |
| Budzy Investments Limited | Preston | 2011 |
| Bueffler Capital Holding Ltd | London | 2025 |
| Buen Capital Limited | West Malling | 2020 |
| Buena Vista Dreams Limited | Enfield | 2017 |
| Buenavista Leisure Limited | Cheltenham | 2026 |
| Buendia Ltd | London | 2021 |
| Bueno 777 Limited | Welwyn | 2024 |
| Bufab UK Holdings Ltd | High Wycombe | 2022 |