| Bulbi.Nl Ltd | Wholesale & retail | 2021 |
| Bulgarasi DE AUR Limited | Transport & logistics | 2022 |
| Bulldog Developments Limited | Real estate | 2012 |
| Bullfrog Bottles Ltd | Wholesale & retail | 2021 |
| Bullsh Independent Trader Company Limited | Wholesale & retail | 2003 |
| Bundy Building Limited | Construction | 2015 |
| Bunyip Veterinary Services Limited | Professional & scientific | 2013 |
| Burdenless Management Company Limited | Households | 1996 |
| Burfield Digital Limited | Professional & scientific | 2006 |
| Burnell Builders + Sons of Bath Somerset Ltd | Construction | 2025 |
| Burnell Heating Solutions Ltd | Construction | 2018 |
| Burnett Business Park Limited | Real estate | 1994 |
| Burnished Ltd | Information & communication | 2012 |
| Burns NED Services Limited | Financial services | 2018 |
| Buro Happold Consulting Engineers Limited | Professional & scientific | 1986 |
| Buro Happold Engineers Limited | Professional & scientific | 1986 |
| Buro Happold Limited | Professional & scientific | 1986 |
| BUS Investments Limited | Financial services | 2014 |
| Bush & Bush Ltd | Professional & scientific | 2008 |
| Business & Energy Management Solutions Ltd | Manufacturing | 2014 |
| Business Accounting & Taxation (Bath) Limited | Professional & scientific | 2003 |
| Business Aircraft Painting Services Ltd | Transport & logistics | 2024 |
| Business and Personal Accountants Limited | Professional & scientific | 2024 |
| Business Cat Ltd | Arts & recreation | 2022 |
| Business Control Limited | Professional & scientific | 2002 |
| Business Lawyer (UK) Limited | Administrative & support | 2014 |
| Business Sparks Ltd | Wholesale & retail | 2011 |
| Busy BEE Cleaning Holdings Limited | Financial services | 2026 |
| Busy Bees Cleaning & Maintenance 2000 Limited | Administrative & support | 1998 |
| Busy Lizzie Home Care Limited | Health & social care | 2020 |
| Butchers Arms 1978 Limited | Hospitality | 2024 |
| Butterworth Consulting Limited | Information & communication | 2018 |
| Buying Support Agency Limited | Professional & scientific | 2002 |
| Buytasker Ltd | Information & communication | 2023 |
| Buzzard Williams Real Estate Ltd | Construction | 2017 |
| BW Meats Ltd | Hospitality | 2022 |
| Bw-Tech Fire & Security Ltd | Information & communication | 2023 |
| BWS Security Systems Limited | Administrative & support | 1999 |
| BX Commerce Ltd | Wholesale & retail | 2025 |
| BY Shepherd Ltd | Construction | 2024 |
| Byarc Ltd | Information & communication | 2012 |
| Bybrook Fishing Limited | Agriculture & fishing | 1994 |
| Bygaia Ltd | Manufacturing | 2025 |
| Byron Management Company (Woolacombe) Ltd | Households | 2015 |
| BZ Investments LP | | 2002 |
| BZB IT Ltd | Information & communication | 2018 |
| C & J Premium Services Limited | Health & social care | 2023 |
| C Bourquin Services Limited | Administrative & support | 2014 |
| C D Accounting Services Limited | Professional & scientific | 1999 |
| C Derrick Plastering Ltd | Construction | 2024 |
| C Enterprise (UK) Limited | Professional & scientific | 2006 |
| C Eves Bath Limited | Professional & scientific | 2009 |
| C J Fabrications Limited | Real estate | 1998 |
| C M Goodwin Limited | Real estate | 2017 |
| C S Electrical (Bath) Limited | Construction | 2002 |
| C S Property (Bath) Limited | Real estate | 2022 |
| C S Williams Property Ltd | Real estate | 2023 |
| C Stick Arcade Ltd | Wholesale & retail | 2024 |
| C the World Limited | Administrative & support | 2009 |
| C&A Brown Properties Ltd | Real estate | 2024 |
| C&C Logistics Group Limited | Transport & logistics | 2024 |
| C&M Meals Ltd | Manufacturing | 2021 |
| C. Firbank (Engineers) Limited | Professional & scientific | 2005 |
| C. Firbank and SON, Limited | Real estate | 1935 |
| C. M. Collective Limited | Manufacturing | 2013 |
| C.E. Davis & Company (Marshfield) Limited | Agriculture & fishing | 1943 |
| C.J.Securities(Bath)Limited | Real estate | 1962 |
| C.O.R. WW Limited | Wholesale & retail | 2020 |
| C.T.C. Precision Engineering Limited | Manufacturing | 1986 |
| C2 Air Conditioning Ltd | Manufacturing | 2013 |
| C3I Investments Beau Nash House Ltd | Financial services | 2023 |
| C3I Investments Ltd | Financial services | 2021 |
| CA Bath Ltd | Hospitality | 2025 |
| Cabaletta Limited | Arts & recreation | 2012 |
| Cabble Lettings Ltd | Real estate | 2025 |
| Cabble Properties Limited | Real estate | 2019 |
| Cabinetry Works Ltd | Construction | 2011 |
| Cabins Limited | Extraterritorial | 1988 |
| Caci Properties Ltd | Real estate | 2017 |
| Cadmid Configuration Consultants Ltd | Professional & scientific | 2019 |
| Cadspot Limited | Information & communication | 2002 |
| Cafe AU Lait (Bath) Limited | Hospitality | 2017 |
| Cafe Lucca Limited | Hospitality | 2014 |
| Cafe Retro Limited | Professional & scientific | 2004 |
| Caffe Terraza Limited | Hospitality | 2021 |
| Caffee Diana Luggage Limited | Other services | 2023 |
| Caiber Limited | Information & communication | 2023 |
| Caines Pump Consultancy Co Limited | Professional & scientific | 2005 |
| Cakeshop.Com (UK) Limited | Wholesale & retail | 2016 |
| CAL Ltd | Health & social care | 2025 |
| Calculus Trading Systems Ltd | Professional & scientific | 2016 |
| Caldom Limited | Real estate | 2024 |
| Caliacademy Limited | Information & communication | 2025 |
| Calibre Generation Limited | Energy | 2017 |
| Calibre Homes (SW) Limited | Construction | 2012 |
| Calibre Homes Developments Limited | Construction | 2014 |
| Calico Content Ltd | Professional & scientific | 2021 |
| Caligroup Limited | Financial services | 2025 |
| Calima Ltd | Information & communication | 2018 |
| Calinette Limited | Financial services | 2020 |