| Buki Finance Limited | Erith | 2014 |
| Bukmaris Consulting Ltd | Harlow Essex | 2016 |
| Bukovuk Ltd | London | 2020 |
| BUL BUL Impex Limited | Musselburgh | 2026 |
| Bula Bula Limited | Dudley | 2024 |
| Bulawayo Mining Company Limited | London | 2017 |
| Bulb Bidco Limited | Bracknell | 2021 |
| Bulb International Holdings Limited | London | 2021 |
| Bulb Midco 1 Limited | Bracknell | 2021 |
| Bulb Midco 2 Limited | Bracknell | 2021 |
| Bulb Topco Limited | Bracknell | 2021 |
| Bulb Ventures Limited | London | 2021 |
| Buld Group Ltd | London | 2025 |
| Bulge Group Investments Limited | England | 2025 |
| Bulgroup Holdings Ltd | Ilford | 2025 |
| Buli Ltd | London | 2023 |
| Bulk Haulage Group Limited | Maldon | 2019 |
| Bulk Haulage Holdings Limited | Mexborough | 2022 |
| Bulk Logistics Limited | Bedale | 2015 |
| Bulkeley Investments Ltd | Manchester | 2024 |
| Bulkeley Property Limited | London | 2011 |
| Bull & Bear Enterprises Limited | Coulsdon | 2012 |
| Bull & Bull Limited | Sidcup | 2018 |
| Bull and Bear Ventures Ltd | Belfast | 2025 |
| Bull Doza Legal Holdings Limited | London | 2024 |
| Bull Family Investments Limited | London | 2015 |
| Bull Ferguson Limited | Chatham | 2009 |
| Bull Markets Limited | London | 2012 |
| Bull MBC FIC Limited | London | 2023 |
| Bull Motif Holdings Limited | Redditch | 2021 |
| Bull UK Holdings Limited | London | 2025 |
| Bull Wealth Management Limited | Grays | 2006 |
| Bull&Grace Ltd | Evesham | 2024 |
| Bullamasplash Limited | Willenhall | 2026 |
| Bullard Wealth Limited | Lowestoft | 2016 |
| Bullas Ltd | Longfield | 2019 |
| Bullas Property Holdings Ltd | Halifax | 2023 |
| Bullbear Investments Limited | Southampton | 2011 |
| Bullbuoys Holdings Limited | Northampton | 2024 |
| Bullbuoys Limited | Northampton | 2022 |
| Bulldog Axiom Financial Ltd | London | 2020 |
| Bulldog Holdings Limited | Basingstoke | 1964 |
| Bulldozer Developer Limited | Orpington | 2020 |
| Bulldozer Group Ltd | London | 2023 |
| Bullen Property Solutions Ltd | Cardiff | 2025 |
| Bullen UND Baeren Stiftung Ltd | Egham | 2021 |
| Bullent Corp Ltd | London | 2025 |
| Bullerwell & Co Limited | Bedfordshire | 2002 |
| Bullerwell Holdings Ltd | Bedford | 2016 |
| Bullet Digital UK Ltd | London | 2025 |
| Bullet Group Ltd | Cheltenham | 2025 |
| Bullet-Loans Limited | London | 2021 |
| Bulletproof Cyber Holdings Ltd | London | 2024 |
| Bulletproof Holdings Ltd | Alderley Edge | 2025 |
| Bulley's Ground Maintenance Limited | Tadley | 2022 |
| Bullfinch Capital Partners Limited | London | 2018 |
| Bullfinch Equity Release Ltd | Brentwood | 2018 |
| Bullfinch Estates Limited | Greater London | 2026 |
| Bullgate Holdco Ltd | Alderley Edge | 2024 |
| Bullimore Underwriting Agency Ltd. | London | 1999 |
| Bullinger Wealth Limited | Tunbridge Wells | 2018 |
| Bullion and Bond Capital Ltd | London | 2025 |
| Bullion Broker Limited | Liverpool | 2022 |
| Bullion CAP Ltd | London | 2025 |
| Bullionedge FX Limited | Oldham | 2025 |
| Bullish UK Custody Limited | London | 2024 |
| Bullish UK Operations Limited | London | 2024 |
| Bullitt Holding Limited | Belfast | 2018 |
| Bullivant Trustees UK Ltd | Derby | 2024 |
| Bullivant Wealth Management Ltd | Wickford | 2020 |
| Bullman Bearstein Ltd | Leicester | 2003 |
| Bullmans Wharf Marine Limited | Southend-On-Sea | 2022 |
| Bullock Street Waste Energy Limited | London | 2016 |
| Bullough Financial Planning Limited | Preston | 2021 |
| Bullprofits Ltd | London | 2025 |
| Bullseye Financial Ltd | London | 2020 |
| Bullseye Holdings Limited | London | 2022 |
| Bullseye Superfactors EOT Limited | Doncaster | 2024 |
| Bullsnape Holdings Limited | Taunton | 2023 |
| Bullstock Holding Company Limited | London | 2019 |
| Bulltrade Signal Alerts Ltd | Croydon | 2025 |
| Bulmer Holdings Limited | Pickering | 2016 |
| Bulmer House Advisory Ltd | Robertsbridge | 2016 |
| Bulmer Leisure Limited | Holyhead | 2020 |
| Bulsatcom Investment Limited | Solihull | 2014 |
| Bulsatcom UK Holdco Limited | Brighton | 2019 |
| Buluk BIZ Ltd | Rochester | 2026 |
| Bulwark Financial Services Limited | Warrington | 2004 |
| Bulwark Global Risk Limited | London | 2012 |
| Bulwark Management Limited | London | 2020 |
| Bumbershoot Limited | Stone | 2010 |
| Bumble BEE Enterprise Limited | Colchester | 2017 |
| Bumble BEE Group Limited | Stoke On Trent | 2023 |
| Bumble Bidco Limited | Blackpool | 2024 |
| Bumble Marketing Holdco Limited | London | 2020 |
| Bumble-Bees Montessori Ltd. | London | 2000 |
| Bumblebee Holdings Ltd | London | 2021 |
| Bumblebee Loans Ltd | London | 1985 |
| Bumblebee Mortgages Limited | Newport | 2020 |
| Bumblebee Services Limited | Nottingham | 2023 |