| Barrett Corp & Harrington Ltd | Financial services | 2006 |
| Barrington Byett Limited | Professional & scientific | 2010 |
| Barrington Decorators Limited | Construction | 2019 |
| Barrington Place Management Company Limited | Real estate | 2016 |
| Barrons Hairdressing Limited | Other services | 2003 |
| Barry Eyecare Ltd | Wholesale & retail | 2024 |
| Bars Renovation Electricity Ltd | Construction | 2022 |
| Bart Homes (Cheltenham) Ltd | Construction | 2018 |
| Barter Barlow Developments Limited | Real estate | 2024 |
| Barter Green Property Investments Ltd | Real estate | 2024 |
| Bartisan Limited | Real estate | 2025 |
| Bartlett Trade Group Ltd | Construction | 2023 |
| Barton & Barton (Cirencester) Limited | Administrative & support | 2007 |
| Barton Hyett Associates Ltd | Professional & scientific | 2009 |
| Barton Mews Ltd | Hospitality | 2024 |
| Bartons Business Services Ltd | Hospitality | 2024 |
| BASE3 Solutions Limited | Information & communication | 2021 |
| Basec Group Limited | Professional & scientific | 2022 |
| Bashall and Hobbs Ltd | Wholesale & retail | 2026 |
| Basil Limited | Households | 1999 |
| Basingstoke Land Ltd | Real estate | 2014 |
| Basker Ltd | Information & communication | 2024 |
| Baskycatering Ltd | Hospitality | 2025 |
| Baslow Management Consultancy Limited | Information & communication | 2003 |
| Bastion Systems Limited | Information & communication | 2021 |
| Bateleur Consulting Limited | Professional & scientific | 2025 |
| Bath & Bristol Loft Conversions Limited | Construction | 2008 |
| Bath & Shower Seal Shop UK Ltd | Wholesale & retail | 2025 |
| Bath Parade Mews Limited | Households | 1986 |
| Bath Road Barbers Ltd | Other services | 2023 |
| Bath Wealth Management Limited | Professional & scientific | 2016 |
| Bathville Mews Management Company Limited | Households | 1982 |
| Batsford Sporting Club Limited | Arts & recreation | 2023 |
| Batt Management Consulting Ltd | Information & communication | 2015 |
| Battenhold Limited | Real estate | 2012 |
| Battledown Brewery LLP | | 2005 |
| Battledown Grange Flats Limited | Real estate | 1959 |
| Battledown Heating Limited | Construction | 2023 |
| Battledown Priors Limited | Households | 1965 |
| Battledown Villa Number One RTM Company Limited | Real estate | 2015 |
| Baum Associates Limited | Professional & scientific | 2016 |
| Bautista Solutions Ltd | Administrative & support | 2023 |
| Bawdsey (1) Limited | Real estate | 2014 |
| Bay Trading Limited | Wholesale & retail | 2014 |
| Bay Tree Dental Limited | Health & social care | 2006 |
| Bay's Kitchen Ltd | Manufacturing | 2016 |
| Bayden Ltd | Construction | 2020 |
| Bayhill Limited | Real estate | 2011 |
| Bayhill Property Limited | Real estate | 2013 |
| Baylis (Gloucester) Holdings Limited | Financial services | 2020 |
| Baylis (Gloucester) Limited | Wholesale & retail | 1993 |
| Bayliss & Higgs Electrical Ltd | Construction | 2016 |
| Bayliss & Iddon - Home & Property Ltd | Real estate | 2026 |
| Bayliss-Jones Ltd | Professional & scientific | 2019 |
| Bayshill Properties Limited | Construction | 2006 |
| Bayt Recruitment Ltd | Administrative & support | 2024 |
| Bayvest Limited | Agriculture & fishing | 2006 |
| BB Consulting International Limited | Professional & scientific | 2016 |
| BB2C LLP | | 2011 |
| Bbmore Ltd | Real estate | 2005 |
| BBN Events Ltd | Arts & recreation | 2019 |
| BBS Facades Limited | Wholesale & retail | 2009 |
| BBU Ltd | Education | 2019 |
| BCH Digital Limited | Information & communication | 2000 |
| BCH Group Ltd | Administrative & support | 2018 |
| BCH Holdings Limited | Information & communication | 2003 |
| Bclla Ltd | Financial services | 2023 |
| Bcnu Services Ltd | Administrative & support | 2023 |
| Bcomp 488 Limited | Extraterritorial | 2014 |
| BCS Haulage Limited | Transport & logistics | 2015 |
| BCS Storage Ltd | Transport & logistics | 2021 |
| BDD Consultants Ltd | Information & communication | 2021 |
| BDM Smiles Limited | Professional & scientific | 2010 |
| BDP Consultancy Limited | Professional & scientific | 2021 |
| BDS Contractors Ltd | Construction | 2025 |
| BE Bamboozled Ltd | Wholesale & retail | 2021 |
| BE Online Safe and Savvy Ltd | Information & communication | 2024 |
| BE Victorious Limited | Other services | 2004 |
| Be&S Limited | Construction | 2020 |
| BE8MAX Ltd | Wholesale & retail | 2025 |
| Beacon Safety Consulting Limited | Administrative & support | 2007 |
| Beaconsfield Court (Cheltenham) Management Limited | Households | 1974 |
| Bealach Consultancy Ltd | Information & communication | 2025 |
| Bear and Boon Ltd | Manufacturing | 2022 |
| Bear Associates Surveyors Limited | Real estate | 2004 |
| Bear House Media Ltd | Information & communication | 2021 |
| Bear Rail Ltd | Professional & scientific | 2015 |
| Beards London Limited | Wholesale & retail | 2011 |
| Beardyman Farm Ltd | Agriculture & fishing | 2022 |
| Beata's Cafe Ltd | Hospitality | 2022 |
| Beats & Bowls Ltd | Wholesale & retail | 2024 |
| Beats and Eats World Limited | Information & communication | 2020 |
| Beaty HR Limited | Professional & scientific | 2009 |
| Beau Monde Salon and Spa Limited | Other services | 2017 |
| Beaufort (Cheltenham) Ltd | Real estate | 2017 |
| Beaufort Arms (Cheltenham) Limited | Hospitality | 2020 |
| Beaufort Dental Health Centre Ltd | Health & social care | 2008 |
| Beaumont Technology Ltd | Information & communication | 2025 |
| Beaurepaire Properties Ltd | Real estate | 2022 |
| Beautique 12 Limited | Other services | 2025 |