| BST Special Projects Ltd | Construction | 2022 |
| BSU Limited | Extraterritorial | 2009 |
| BTC Hospitality Investments Limited | Professional & scientific | 2006 |
| Btcapps Limited | Real estate | 2020 |
| BTD Group Limited | Professional & scientific | 2015 |
| BTP Consultancy Ltd | Professional & scientific | 2017 |
| BTP Icon UK Ltd | Information & communication | 2023 |
| Buban Ltd | Wholesale & retail | 2018 |
| Bubbled Publishing Limited | Information & communication | 2024 |
| Bucci Industries UK Limited | Wholesale & retail | 2023 |
| Buckingham House Cheltenham Management Company Limited | Households | 2021 |
| Bucklesham Solar Limited | Energy | 2022 |
| Buckley & Bayliss-Chapman Ltd | Health & social care | 2022 |
| Buckley Trading Group Limited | Professional & scientific | 2024 |
| Budding Developments Ltd | Construction | 2016 |
| Buddy Worldwide Limited | Arts & recreation | 2009 |
| Buenavista Leisure Limited | Financial services | 2026 |
| Buffalo Financial Management Ltd | Professional & scientific | 2020 |
| Buffin Leadership International Limited | Professional & scientific | 2006 |
| Bugatti Molsheim Limited | Arts & recreation | 1987 |
| Bugatti Owners' Club,Limited(The) | Arts & recreation | 1930 |
| Bugcrowd UK Ltd | Administrative & support | 2020 |
| Bugdev Ltd | Information & communication | 2025 |
| Build Block Online Ltd | Wholesale & retail | 2021 |
| Build Hospitality Ltd | Construction | 2025 |
| Buildcore Construction Ltd | Construction | 2020 |
| Building Better Learning Ltd | Education | 2025 |
| Building Block Design Limited | Professional & scientific | 2017 |
| Building Construction Solutions LLP | | 2010 |
| Building Image in Europe Ukeig | Professional & scientific | 1992 |
| Building Solutions & More Ltd | Construction | 2016 |
| Building Supplies and Insulation Distribution Limited | Construction | 2015 |
| Buildtech (SW) Limited | Construction | 2016 |
| Buildtech Group Ltd | Construction | 2019 |
| BULBS4LIFE Limited | Manufacturing | 2009 |
| Bull Developments (Stonehouse) Ltd | Construction | 2013 |
| Bull F1T Ltd | Arts & recreation | 2023 |
| Bull Motif Mini Spares Ltd | Wholesale & retail | 2025 |
| Bulldog Protection Systems Limited | Construction | 2002 |
| Bullet Group Ltd | Financial services | 2025 |
| Bully Trading Ltd | Wholesale & retail | 2022 |
| Bunda Property Ltd | Real estate | 2021 |
| Bunty Haven Limited | Arts & recreation | 2014 |
| Burdett Legal Ltd | Financial services | 2022 |
| Burdett Partners Limited | Administrative & support | 2016 |
| Bureau Proberts International Limited | Professional & scientific | 2022 |
| Burel Air Limited | Administrative & support | 1998 |
| Burford Byres Ltd | Real estate | 2026 |
| Burford Lodge Limited | Households | 1996 |
| Burger Burger Limited | Hospitality | 2007 |
| Burke Bros (Commercials) Limited | Extraterritorial | 1949 |
| Burke Bros.(Cheltenham)Limited | Wholesale & retail | 1953 |
| Burleigh Design Ltd | Professional & scientific | 2016 |
| Burleigh Transport Holdings Limited | Other services | 2020 |
| Burleigh Travel (Transport) Ltd | Administrative & support | 2009 |
| Burleigh Travel Limited | Administrative & support | 1998 |
| Burleigh Ventures Limited | Professional & scientific | 2009 |
| Burlow Engineering Ltd | Professional & scientific | 2012 |
| Burnett Alleyne Services UK Ltd | Professional & scientific | 2020 |
| Burning Need Ltd | Professional & scientific | 2017 |
| Burrows LEA Livery Ltd | Other services | 2006 |
| Burrwood Designs Ltd | Manufacturing | 2016 |
| Burston House Ltd | Households | 2002 |
| Burtech Consulting Ltd | Administrative & support | 2014 |
| Burton Automotive Limited | Wholesale & retail | 2024 |
| Burton Electrical Limited | Construction | 2019 |
| Burton Group Properties Ltd | Real estate | 2022 |
| Bushcombe House Farm Ltd | Hospitality | 2017 |
| Bushurst Properties Limited | Real estate | 1973 |
| Business Air Centre Limited | Transport & logistics | 1989 |
| Business Analysis Excellence Ltd | Administrative & support | 2024 |
| Business and Lifestyle Ltd | Administrative & support | 2026 |
| Business Delivery Consulting Limited | Professional & scientific | 2023 |
| Business Furniture Direct Limited | Wholesale & retail | 2010 |
| Business in a Pizza Box Limited | Hospitality | 2020 |
| Business Intelligencia Ltd | Professional & scientific | 2023 |
| Business Network Limited | Information & communication | 2007 |
| Business Trade Management Limited | Professional & scientific | 2009 |
| Business@Bankhouse Limited | Real estate | 2022 |
| Buskers Court Management Company Limited | Households | 2018 |
| Butland Property Ltd | Real estate | 2016 |
| Butler Assets Ltd | Real estate | 2017 |
| Butler Property Holdings Ltd | Real estate | 2022 |
| Butlers Hill Farm Limited | Agriculture & fishing | 2015 |
| Butlers Wood Bess Limited | Energy | 2022 |
| Butts Lane Limited | Real estate | 2022 |
| BW Plastering Limited | Construction | 2016 |
| BW Sipp Trustees Limited | Financial services | 1995 |
| BWC Property Ventures Nationwide Limited | Real estate | 2016 |
| Bwlha Limited | Financial services | 2024 |
| BWS Property Ltd | Agriculture & fishing | 2026 |
| BY Antonia Illustration Ltd | Manufacturing | 2024 |
| BY Design Consulting Group Ltd | Professional & scientific | 2023 |
| BY the Meadow Farm Limited | Agriculture & fishing | 2013 |
| Bybrook Investments Limited | Real estate | 2004 |
| Bybrook Management Services Limited | Administrative & support | 2002 |
| Byco International Ltd | Administrative & support | 2024 |
| Byrd Link Audit & Accountancy Services Limited | Professional & scientific | 2020 |
| Byrd OUT Limited | Information & communication | 2016 |
| Byrkley Aquatics & Aquascaping Ltd | Wholesale & retail | 2023 |