| Bella MIA Skin & Beauty Limited | Other services | 2018 |
| Bella MIA Training Academy Limited | Education | 2021 |
| Bellcamps Ltd | Transport & logistics | 2019 |
| Belleva Holdings Limited | Financial services | 2014 |
| Bellevue Nail & Beauty Bar Ltd | Other services | 2024 |
| Bells Supermarket (Offmore) Limited | Wholesale & retail | 2004 |
| Belvont Global Ltd | Wholesale & retail | 2016 |
| BEN Laud Trading Ltd | Manufacturing | 2012 |
| Benam East Herts Management Company Limited | Extraterritorial | 2023 |
| Bennion-Odell Ltd | Professional & scientific | 2021 |
| Bentley Chemicals Holdings Limited | Financial services | 2011 |
| Bentley Chemicals Limited | Wholesale & retail | 1978 |
| Beokrumer Ltd | Wholesale & retail | 2021 |
| Bepco UK Limited | Wholesale & retail | 1997 |
| Berikos Properties Ltd | Households | 2025 |
| Berlif Ltd | Wholesale & retail | 2020 |
| Berrigan LX Consultancy Limited | Health & social care | 2025 |
| Berwyn Thomas Consultancy Group Ltd | Professional & scientific | 2019 |
| Beryl Guitars Ltd | Manufacturing | 2008 |
| Besimwock Ltd | Transport & logistics | 2024 |
| Bestbeemlots Ltd | Administrative & support | 2020 |
| Bestchoisecars Ltd | Wholesale & retail | 2022 |
| Bestra Ltd | Transport & logistics | 2014 |
| Better Call OL Limited | Construction | 2021 |
| Bettertrollinn Ltd | Administrative & support | 2019 |
| Bewdley Care Limited | Health & social care | 2011 |
| Bewdley Manor Management Ltd | Households | 2009 |
| Bewdley Properties Ltd | Real estate | 2022 |
| Bholenath Ltd | Hospitality | 2021 |
| BHP Collectibles Limited | Wholesale & retail | 2021 |
| Bianca VAR Trans Ltd | Transport & logistics | 2022 |
| Biblioyel Ltd | Administrative & support | 2020 |
| Bicknells Transport Group Ltd | Administrative & support | 2025 |
| Big Wills Tattooing LLP | | 2023 |
| Bigmouths Catering Ltd | Hospitality | 2020 |
| Bigplateresto Ltd | Transport & logistics | 2019 |
| Bike Skills Ltd | Education | 2025 |
| Billingsley Electrical Contractors Limited | Construction | 2008 |
| Billingtons Developments Ltd | Construction | 2020 |
| Bils DY11 Ltd | Hospitality | 2025 |
| Bimmauk Limited | Education | 2020 |
| Biocon Ltd | Extraterritorial | 2018 |
| Birch Brothers Holdings Limited | Construction | 2015 |
| Birch Heating & GAS Services Ltd | Construction | 2014 |
| Birchen Coppice Stores Ltd | Wholesale & retail | 2026 |
| Bird's Groupage Ltd | Wholesale & retail | 2019 |
| Birkett & Clark Ltd | Real estate | 2019 |
| Birmingham Speedway PBS Limited | Arts & recreation | 2015 |
| Bishop's Butchery and Burgers Limited | Hospitality | 2020 |
| Bison Precision Engineering Ltd | Manufacturing | 2019 |
| Bithell Holding Company Limited | Information & communication | 2021 |
| Bizzio Limited | Administrative & support | 2021 |
| BK Site Services Limited | Construction | 2008 |
| Black Country Medics Limited | Education | 2021 |
| Black Crown Capital Limited | Financial services | 2018 |
| Black Heart Tattoo Ltd | Arts & recreation | 2017 |
| Black Hill Books Ltd | Information & communication | 2021 |
| Black Pear Press Limited | Information & communication | 2013 |
| Blackheath Metal Industries Limited | Real estate | 1971 |
| Blackledge and Leslie Limited | Health & social care | 2013 |
| Blackpole Aggregates Limited | Construction | 2025 |
| Blackpole Commercials Limited | Manufacturing | 2025 |
| Blackpole Fabrication Limited | Manufacturing | 2025 |
| Blackpole Group Limited | Financial services | 2025 |
| Blackpole Haulage Limited | Wholesale & retail | 2025 |
| Blackpole Re:Source Limited | Water & waste | 2025 |
| Blackpool Investments Limited | Construction | 2020 |
| Blacksky Investments Limited | Real estate | 2023 |
| Bladen Lettings Limited | Real estate | 2023 |
| Bladenproperties Ltd | Real estate | 2022 |
| Blakedown Catering Limited | Hospitality | 2016 |
| Blakedown Properties Ltd | Financial services | 2026 |
| Blaze Monroe Associates Ltd | Professional & scientific | 2019 |
| BLC Automotive Limited | Wholesale & retail | 2023 |
| Blee Transport Ltd | Transport & logistics | 2020 |
| Blend Hair Studio Ltd | Other services | 2023 |
| BLH Lettings Limited | Real estate | 2021 |
| Blink Vision Centre Limited | Health & social care | 2011 |
| Bliss Gate Nature Explorers CIC | Education | 2025 |
| Blisstech Solutions Ltd | Information & communication | 2012 |
| Block Clean Ltd | Administrative & support | 2021 |
| Bloomers Florist Ltd | Wholesale & retail | 2019 |
| Bloomflux Ltd | Transport & logistics | 2019 |
| Blue Bush Ltd | Professional & scientific | 2003 |
| Blue Circle Contractors Limited | Wholesale & retail | 2018 |
| Blue Flame GAS Limited | Construction | 2015 |
| Blue Hoots Pre-School & OUT of School Care Limited | Education | 2009 |
| Blue Kingfisher Rural SPV Limited | Real estate | 2026 |
| Bluebell Hill Enterprises Ltd | Transport & logistics | 2025 |
| Blueco Electrical Ltd | Construction | 2020 |
| Bluspace Software Limited | Information & communication | 2025 |
| BM Consortium Ltd | Wholesale & retail | 2015 |
| BMK Stourport Ltd | Hospitality | 2026 |
| BOB Price & SON Groundworks Ltd | Construction | 2024 |
| BOB Price & SON Limited | Construction | 2014 |
| Bobby Mander Ltd | Professional & scientific | 2017 |
| Bodor Laser UK Limited | Manufacturing | 2024 |
| Bold Solutions Group Limited | Manufacturing | 2000 |
| Bombay Blues Bari Limited | Hospitality | 2026 |
| Bombay Blues Hindustani Ltd | Hospitality | 2019 |