| Blankney Sporting Ltd | Arts & recreation | 2026 |
| Blue Baker.Com Ltd | Construction | 2004 |
| Blue Coral Limited | Construction | 2016 |
| Blue Knight Projects Limited | Professional & scientific | 2016 |
| Blue Plume Limited | Wholesale & retail | 2022 |
| Blueprint Productions Ltd | Information & communication | 2025 |
| BMG Goat Ltd | Professional & scientific | 2025 |
| Boldmile Limited | Wholesale & retail | 2020 |
| Bombay Club & Company Ltd | Hospitality | 2024 |
| Boseley Developments Ltd | Construction | 2024 |
| Boston Road 1977 Limited | Extraterritorial | 2014 |
| Bozo Catering Limited | Hospitality | 2025 |
| BP Brickworks Limited | Construction | 2008 |
| BPC Plumbing & Developments Ltd | Construction | 2022 |
| Br&Cs Limited | Construction | 2018 |
| Brass Windmill Leasing Limited | Real estate | 2026 |
| Brass Windmill Ltd | Hospitality | 2023 |
| Brauncewell Quarries Limited | Mining & quarrying | 1971 |
| Brazil Airport Transfers Ltd | Transport & logistics | 2007 |
| BRB Plant Ltd | Construction | 2017 |
| Breakfast Bunch Ltd | Manufacturing | 2024 |
| Bridge Instrument Designs Ltd | Professional & scientific | 2006 |
| Bridge Violins Limited | Manufacturing | 2004 |
| Bridgman Consulting Ltd | Professional & scientific | 2022 |
| Brinkhouse Limited | Real estate | 2015 |
| Bristol Arcades Limited | Construction | 1959 |
| British Fire Services Association(The) | Other services | 1912 |
| Brookes Kitchens and Bathrooms Ltd | Construction | 2007 |
| Brothers 44 Ltd | Hospitality | 2019 |
| Bryan Ruby Carpets & Flooring Ltd | Wholesale & retail | 2025 |
| Budge Properties Limited | Real estate | 2021 |
| Built Environment Design Limited | Extraterritorial | 2024 |
| Built Environment Design Partnership Limited | Professional & scientific | 2016 |
| Built Environment Group Limited | Financial services | 2016 |
| Bumco Ltd | Manufacturing | 2025 |
| Buns on the Run Smokehouse Ltd | Hospitality | 2026 |
| Burke & Hair the Barbers Shop Ltd | Other services | 2020 |
| Burnbox Ltd | Agriculture & fishing | 2024 |
| Burton Advisers Limited | Professional & scientific | 1996 |
| Burton Air Conditioning Limited | Energy | 1999 |
| Burton Brothers Partners Ltd | Administrative & support | 2021 |
| Businessresale Ltd | Wholesale & retail | 2017 |
| Bwsc Generation Services UK Ltd | Energy | 2013 |
| C & J Buildings Limited | Construction | 2015 |
| C a Duffy Engineering Limited | Professional & scientific | 2020 |
| C and J Agri Ltd | Financial services | 2025 |
| C H Sandall & SON Limited | Manufacturing | 2000 |
| C M (Ware Road) Limited | Wholesale & retail | 2015 |
| C&M Stores Ltd | Wholesale & retail | 2014 |
| C&N Insulation Ltd | Construction | 2013 |
| C. Morrissey Ltd | Other services | 2017 |
| C. S. Casey & Co Limited | Extraterritorial | 2018 |
| C.C. Cousland & SON Limited | Agriculture & fishing | 1979 |
| C.Camden-Smith and Associates Ltd | Health & social care | 2021 |
| CALP27 Investments Limited | Real estate | 2023 |
| Camel Anaesthesia Limited | Health & social care | 2019 |
| Camp Squared Limited | Administrative & support | 2026 |
| Campion Design Ltd | Professional & scientific | 2019 |
| Campista Limited | Hospitality | 2017 |
| Captain Scarlift Coaching Limited | Education | 2025 |
| Carka Properties Limited | Real estate | 2020 |
| Carlight Heritage Ltd | Arts & recreation | 2016 |
| Carre Properties Limited | Construction | 2024 |
| Castledines Electrical Limited | Wholesale & retail | 2001 |
| Cathedral View Developments Limited | Construction | 2023 |
| Caunt Properties Limited | Real estate | 2012 |
| Causebrook Smith Limited | Wholesale & retail | 2014 |
| Cawsey Motors Limited | Wholesale & retail | 2009 |
| CC Nurseries Ltd | Extraterritorial | 2011 |
| CD Property Group Ltd | Real estate | 2025 |
| CD Safety Consultancy Ltd | Professional & scientific | 2015 |
| Cdrdarling Limited | Wholesale & retail | 2026 |
| Centurion Health Care Services (Lincolnshire) Ltd | Health & social care | 2013 |
| Centurion Plumbing Services Limited | Construction | 2015 |
| CHAK27 Ltd | Hospitality | 2024 |
| Chaltamo Clover Ltd | Wholesale & retail | 2024 |
| Chanceoption Homes Limited | Construction | 2010 |
| Charlie Bridges Mortgages & Protection Ltd | Financial services | 2019 |
| Charlie Bridges Wills & Estate Planning Ltd | Administrative & support | 2019 |
| Chartermill Limited | Construction | 2015 |
| Chasella Limited | Administrative & support | 1979 |
| Checkers Cafe Ltd | Hospitality | 2022 |
| Chenab Business Group Ltd | Real estate | 2020 |
| Cheshire Ltd | Real estate | 2022 |
| Cheshire-Snowden Developments Ltd | Construction | 2024 |
| Chillfix Ltd | Manufacturing | 2010 |
| Chiltern Natural Foods Limited | Manufacturing | 2018 |
| Chris Lynch IT Consulting Limited | Information & communication | 2018 |
| Cinderhill Land Ltd | Real estate | 2018 |
| Circular Aggregates Limited | Transport & logistics | 2024 |
| Cirrus Apta Limited | Real estate | 2018 |
| Citroen Classics Sleaford Limited | Wholesale & retail | 2023 |
| Cjmb IT Consultancy Limited | Information & communication | 2025 |
| CKS Stonework & Building Limited | Construction | 2021 |
| Cladwright Ltd | Construction | 2023 |
| Clark Design & Draughting Limited | Professional & scientific | 2008 |
| Clean 'N' Shine Limited | Professional & scientific | 2015 |
| Clearly Better Designs Ltd | Extraterritorial | 2025 |
| Clearly Better Living Ltd | Real estate | 2025 |
| Clearly Better Windows Ltd | Construction | 2018 |