| Background Group Ltd | London | 2017 |
| Background Holdings Limited | Shrewsbury | 2023 |
| Background People Limited | London | 2025 |
| Backhouse Construction Insurance Brokers Limited | Nelson | 1969 |
| Backhouse Group Limited | Bristol | 2025 |
| Backhouse Independent Financial Services Limited | Nelson | 1973 |
| Backhouse Insurance Brokers Limited | Nelson | 1935 |
| Backing British Business Ltd | Weybridge | 2014 |
| Backler Investments Limited | Edinburgh | 2025 |
| Backrate Limited | Borehamwood | 2024 |
| Backsplash Limited | Canterbury | 2016 |
| Backstage Beauty Group Ltd | London | 2024 |
| Backstage Financial Limited | Towcester | 2025 |
| Backstrom Holdings Ltd | Arundel | 2023 |
| Backtest Global Ltd | Bootle | 2025 |
| Backwaters Investment Ltd | Livingston | 2023 |
| Backwells Limited | London | 1998 |
| Bacon & Bear Limited | Truro | 2025 |
| Bacon & Woodrow Partnerships Limited | Liverpool | 1996 |
| Bacon Holdings Limited | Norwich | 2024 |
| Bacon Legal Consulting Limited | Salford | 2011 |
| Bacqd Capital Limited | Bishop'S Stortford | 2025 |
| Bacs Fire Safety Ltd | Colchester | 2025 |
| Bactalogical Group Ltd | Gateshead | 2021 |
| Bactel Carrier Services Limited | Eastbourne | 1998 |
| Bacton Estates Limited | London | 2023 |
| BAD Wolf Investments Ltd | London | 2025 |
| Bada Bing Group Limited | Norwich | 2026 |
| Bada Bing Holdings Ltd | Pontypridd, | 2024 |
| Badaoui Brear Ltd | London | 2019 |
| Badbury Holdings Limited | Wimborne | 2021 |
| Badby Limited | Cockfosters | 2017 |
| Baddesley Accident & Hire Services Ltd | Greenford | 2013 |
| Baddesley Knight Holdings Ltd | Burton-On-Trent | 2022 |
| Baddow Capital Limited | Chelmsford | 2026 |
| Bade Holdings Ltd | London | 2022 |
| Badea Holdings Ltd | Knebworth | 2025 |
| Badenheath Development Holding SPV Limited | Glasgow | 2021 |
| Badenoch Investments | London | 2021 |
| Bader Malan Limited | Leatherhead | 2001 |
| Badge Global Ltd | Billingham | 2025 |
| Badger Bidco Limited | London | 2021 |
| Badger Finance Limited | London | 2003 |
| Badger Investment Holdings Limited | London | 2026 |
| Badger Investments | Birmingham | 2017 |
| Badger Loans Limited | Paignton | 2016 |
| Badger Special Projects Limited | Cowbridge | 2026 |
| Badgerholt Holdings Ltd | Bridgend | 2025 |
| Badgers Burrow Limited | Ipswich | 2026 |
| Badgers Consultancy Services Ltd | Middlesbrough | 2025 |
| Badgers Gate Holdings Ltd | London | 2024 |
| Badgerwood Holdings Ltd | High Peak | 2026 |
| Badham Group Ltd | Sevenoaks | 2026 |
| Badhan Holdings Ltd | Birmingham | 2024 |
| Badhan Limited | West Bromwich | 2024 |
| Badiane East Limited | London | 2023 |
| Badiani Enterprise Ltd | Leicester | 2017 |
| Badj AM 1 Limited | Newport Pagnell | 2025 |
| Badj Cricket Limited | Newport Pagnell | 2024 |
| Badley Geoscience Group Limited | Spilsby | 2025 |
| Badley Geoscience Holdings Limited | Spilsby | 2021 |
| Badmore Infra 1 Ltd | London | 2024 |
| Badnor Financial Services Limited | Farnham | 1992 |
| Badosa Ltd | Manchester | 2023 |
| Badri Consultancy UK Ltd | Altrincham | 2024 |
| Badshah Holdings Limited | London | 2024 |
| Badshop.De PLC | Stockport | 2021 |
| Badsworth Financial Limited | Rochdale | 2025 |
| Badtap Limited | 91 Waterloo Road | 2022 |
| Badudanla International Investment Co., Ltd | West Midlands, England | 2025 |
| Baduhenna Bidco Limited | Cardiff | 2021 |
| Baduhenna Holdco Limited | Cardiff | 2021 |
| Badwolf Holdings Limited | Stoke-On-Trent | 2017 |
| BAE EOT Limited | Bristol | 2021 |
| BAE Systems (Holdings) Limited | Camberley | 2004 |
| BAE Systems (Kazakhstan) Limited | Camberley | 1998 |
| BAE Systems (MEH) Limited | Camberley | 2001 |
| BAE Systems Electronics Limited | Camberley | 1897 |
| BAE Systems Integrated System Technologies Limited | Camberley | 1997 |
| BAE Systems Land Systems (Finance) Limited | Camberley | 1991 |
| BAE Systems Marine (Holdings) Limited | Camberley | 1985 |
| BAE Systems Surface Ships (Holdings) Limited | Camberley | 2007 |
| BAE Systems Surface Ships (Overseas) Limited | Camberley | 2009 |
| Baecd Ltd | Morden | 2024 |
| Baemos Holdings Limited | London | 2017 |
| BAF Printers (Holdings) Limited | Leeds | 2022 |
| BAF19 Limited | London | 2023 |
| Bafa Holdings Ltd | Glasgow | 2025 |
| Bafa Ventures Ltd | Liverpool | 2025 |
| Baffa Limited | Nottingham | 2026 |
| Baffoe Bekoe Capital Ltd | London | 2026 |
| Baffoe Bekoe Holdings Ltd | London | 2026 |
| BAG of Holding Limited | Brighton | 2026 |
| Baganton Business and Systems Consulting(Uk) T/A Responsive Care Service Ltd | London | 2014 |
| Bagasi Investments Ltd | Bolton | 2019 |
| Bagatelle Holdings Ltd | London | 2024 |
| Bagchi Kotnis and Daughters Ltd | Harrow | 2025 |
| Bagden Holdings Limited | Huddersfield | 2019 |
| Bage & Group Ltd | London | 2025 |
| Bageco Limited | Cambridge | 2025 |