| Beltov 2 Limited | Real estate | 2025 |
| Belvedere Resources Limited | Extraterritorial | 2006 |
| Belveduese PWD Ltd | Agriculture & fishing | 2022 |
| Bemacts Ltd | Administrative & support | 2025 |
| Bemc International Limited | Health & social care | 2016 |
| BEN Elliott Limited | Wholesale & retail | 2016 |
| BEN Fletcher Limited | Construction | 2003 |
| BEN Forster Ltd | Transport & logistics | 2015 |
| BEN Lomond Holdings Limited | Financial services | 2025 |
| BEN Murtagh Ltd | Administrative & support | 2019 |
| BEN Smith (Farrier) Limited | Agriculture & fishing | 2009 |
| BEN Strebel Limited | Information & communication | 2019 |
| Ben-Mira General Services UK (BGS) Ltd | Wholesale & retail | 2021 |
| Ben-Tek Ltd | Information & communication | 2024 |
| Benchtown Limited | Professional & scientific | 1915 |
| Benecas Productions Ltd | Arts & recreation | 2021 |
| Benefit Answers Limited | Financial services | 2006 |
| Beneil Electrical Ltd | Construction | 2015 |
| Beneil Properties Limited | Real estate | 2025 |
| Benetimo Limited | Professional & scientific | 2010 |
| Benignus Limited | Administrative & support | 2025 |
| Benjamin Blogs Ltd | Professional & scientific | 2025 |
| Benjamin Hackett Film Ltd | Information & communication | 2026 |
| Benjamin Solicitors Limited | Professional & scientific | 2015 |
| Benjamin Waters Limited | Extraterritorial | 2026 |
| Benjamin Williams Limited | Hospitality | 2012 |
| Bennett D Limited | Wholesale & retail | 2014 |
| Bennett Holdings NW Ltd | Financial services | 2023 |
| Bennett Homes NW Ltd | Real estate | 2023 |
| Bennetts MOT & Car Repair Centre Limited | Wholesale & retail | 2018 |
| Bennisound & Light Limited | Construction | 2006 |
| Benray Services Ltd | Professional & scientific | 2025 |
| Benthom Construction Limited | Construction | 2023 |
| Benthom Developments Ltd | Construction | 2012 |
| Benthom Group Limited | Professional & scientific | 2023 |
| Benthom Homes Limited | Administrative & support | 2019 |
| Bentley Consultants Ltd | Information & communication | 1994 |
| Bentley Entertainment Group Limited | Health & social care | 2026 |
| Bentom Limited | Administrative & support | 2005 |
| BER Jackson Limited | Construction | 2024 |
| Beresford Digital Assets Limited | Financial services | 2026 |
| Berigan Consulting Limited | Administrative & support | 2013 |
| Berkeley Care Management Limited | Health & social care | 1996 |
| Berkeley Drummond Limited | Extraterritorial | 1999 |
| Berkeley Square Trading Ltd | Financial services | 2020 |
| Berkerley Consultancy UK Ltd | Financial services | 2021 |
| Berkley Estates Limited | Real estate | 2018 |
| Bernard Dickinson Limited | Wholesale & retail | 1984 |
| Bernard Moon Limited | Construction | 2005 |
| Bernard Watson Limited | Extraterritorial | 2016 |
| Berry Box Ltd | Manufacturing | 2021 |
| Berry Lane Bakery Ltd | Manufacturing | 2011 |
| Berry's Animal Feeds Limited | Wholesale & retail | 2003 |
| Berwick Commercial Ltd | Real estate | 2024 |
| BES Design (Preston) Limited | Administrative & support | 2008 |
| Bespoke Barber Ltd | Manufacturing | 2018 |
| Bespoke Beauty by RH Ltd | Other services | 2017 |
| Bespoke Events Specialists Limited | Administrative & support | 2008 |
| Bespoke EYE Surgery Limited | Health & social care | 2022 |
| Bespoke Healthcare (Holdings) Limited | Professional & scientific | 2013 |
| Bespoke Healthcare Limited | Health & social care | 2006 |
| Bespoke Hospital Limited | Health & social care | 2025 |
| Bespoke Oak and Slate Ltd | Administrative & support | 2026 |
| Bespoke Property Solutions NW Ltd | Construction | 2026 |
| Bespoke Radiology Solutions Limited | Health & social care | 2023 |
| Best Commerce Group Ltd | Wholesale & retail | 2020 |
| Best Crypto Ltd | Information & communication | 2021 |
| Best Dressed Guest Limited | Wholesale & retail | 2015 |
| Best Elco Limited | Wholesale & retail | 2003 |
| Best Hamoz Barber Ltd | Other services | 2023 |
| Best Hygiene Supplies Ltd | Manufacturing | 2021 |
| Best Investments (North West) Limited | Real estate | 2006 |
| Best Marketing 4 U Ltd | Professional & scientific | 2023 |
| Best MIX Concrete Blackburn Limited | Manufacturing | 2024 |
| Best Price Caravan and Motor Homes Limited | Wholesale & retail | 2022 |
| Bestbell Limited | Other services | 2003 |
| Bestdeliverycouriers Ltd | Transport & logistics | 2023 |
| Betastate Ltd | Information & communication | 2025 |
| Bethany Dobson Limited | Other services | 2023 |
| Bethel Brothers Co Ltd | Manufacturing | 2024 |
| Bethel Window Cleaning Limited | Administrative & support | 2024 |
| Bethesda Properties Limited | Real estate | 2026 |
| Betta Parcel Service Ltd | Transport & logistics | 2025 |
| Better Barn Limited | Real estate | 2004 |
| Better Bungalows LLP | | 2006 |
| Better Doors Ltd | Extraterritorial | 2017 |
| Better Stays Property Management Ltd | Households | 2024 |
| Betty's Fish & Chips Ltd | Hospitality | 2021 |
| Betty's Kitchen Limited | Hospitality | 2019 |
| Betty's Tipis Limited | Hospitality | 2016 |
| Bevan & Black Ltd | Professional & scientific | 2019 |
| Bevlee Properties Limited | Construction | 1961 |
| Bexprime Ltd | Professional & scientific | 2003 |
| Beyond Artist Management Ltd | Arts & recreation | 2021 |
| Beyond Borders Creative Consultancy Ltd | Education | 2025 |
| Beyond Horizon Estates and Management Limited | Real estate | 2024 |
| Beyond Interactive Communications Ltd | Information & communication | 2006 |
| Beyond Limits OT Ltd | Health & social care | 2016 |
| Bezalel Infotech PVT Ltd | Information & communication | 2024 |
| Bezamicon Ltd | Education | 2024 |