| BP Truck Exports Limited | Wholesale & retail | 2013 |
| Bradlands Pet Supplies Limited | Wholesale & retail | 2018 |
| Bradman-Lake Group Limited | Professional & scientific | 2007 |
| Bradman-Lake Limited | Manufacturing | 2007 |
| Brailsford Property Group Ltd | Real estate | 2019 |
| Brayford Holdings Ltd | Real estate | 2018 |
| Breck Lane Management Company Limited | Administrative & support | 2023 |
| Brew Shed (Retford) Ltd | Hospitality | 2018 |
| Brick & Tile (Retford) Limited | Hospitality | 2025 |
| Bridge Services Limited | Administrative & support | 2006 |
| Bridgegate Cycles Limited | Wholesale & retail | 2013 |
| Bridgegate Jewellers Ltd | Wholesale & retail | 2023 |
| Briggs Property Group Limited | Real estate | 2025 |
| Bright I Business Solutions Limited | Professional & scientific | 2014 |
| Brightville Medicals Limited | Health & social care | 2013 |
| Brik Property Group Ltd | Real estate | 2026 |
| Brit Pet Care Ltd | Wholesale & retail | 2022 |
| Brit-Tactical Airsoft. Ltd | Arts & recreation | 2009 |
| Brooks Consulting Services Limited | Professional & scientific | 2026 |
| Browns Barbershop Limited | Other services | 2025 |
| Browns Property Services Ltd | Real estate | 2026 |
| Browns Sash Window Restorations Ltd | Construction | 2026 |
| BRS Electrical Ltd | Construction | 2013 |
| BS Squared (Leen Gate) Limited | Real estate | 2019 |
| BS Squared Ltd | Real estate | 2018 |
| Bswr LLP | | 2022 |
| BTS Tools Ltd | Wholesale & retail | 2022 |
| Bubble Design & Marketing Limited | Professional & scientific | 2000 |
| Buckley & Taylor Limited | Professional & scientific | 1902 |
| Buddy & Bella Limited | Wholesale & retail | 2009 |
| Burgess Photo Print Limited | Manufacturing | 2002 |
| Burgin Atkinson & Company Ltd | Real estate | 2009 |
| Burman Plant (Notts) Ltd | Administrative & support | 2020 |
| Burton UK Commercials Ltd | Wholesale & retail | 2019 |
| Business GLU Limited | Administrative & support | 2022 |
| Busy BEE Cleaning Retford Limited | Administrative & support | 2025 |
| Busy Bees Retford Ltd | Administrative & support | 2025 |
| Butchers Chop Shop Ltd | Other services | 2020 |
| Butterley Limited | Professional & scientific | 2009 |
| Bycroft Consulting Ltd | Construction | 2021 |
| Bygone Gardens Ltd | Arts & recreation | 2018 |
| C & AM Associates Limited | Professional & scientific | 2013 |
| C & J Aesthetics Limited | Other services | 2024 |
| C & R Bentley Ltd | Construction | 2019 |
| C & S Properties (Retford) Limited | Real estate | 2013 |
| C E Musicworks Ltd | Extraterritorial | 2021 |
| C F Beckett Plumbing and Heating Limited | Construction | 2009 |
| C F Hire Limited | Administrative & support | 2021 |
| C Gosling Limited | Construction | 2016 |
| C Hall Building & Construction Ltd | Construction | 2021 |
| C Hall Property and Developments Ltd | Construction | 2025 |
| C Ives Estates Ltd | Real estate | 2020 |
| C L Steel Fabrication Limited | Manufacturing | 2007 |
| C P Design Interiors Ltd | Wholesale & retail | 2017 |
| C S Rigging Ltd | Construction | 2016 |
| C W Education Ltd | Extraterritorial | 2022 |
| C. B. Groundworks Limited | Construction | 2024 |
| C. Ratcliffe Builders Limited | Construction | 2006 |
| C.M.& G.W.Goacher Limited | Agriculture & fishing | 1961 |
| C.S. Scaffold Contracts Limited | Construction | 2001 |
| C.S.L. Industrial Limited | Manufacturing | 1998 |
| Caledonian Marketing Ltd | Administrative & support | 2022 |
| Calladines Park Homes Limited | Extraterritorial | 2014 |
| Camms Sporting Ltd | Agriculture & fishing | 2026 |
| Cannon Conversions Limited | Wholesale & retail | 2024 |
| Cannon Mortgages Limited | Financial services | 2006 |
| Captrics Limited | Professional & scientific | 2019 |
| Cara Restaurants Limited | Hospitality | 2000 |
| Carbon Club Limited | Other services | 2007 |
| Careercollab Limited | Professional & scientific | 2024 |
| Caretradeuk Ltd | Information & communication | 2025 |
| Carewell Management Limited | Real estate | 2004 |
| Carl Noble Electrical Limited | Construction | 2003 |
| Carl Parker Steel Solutions Ltd | Manufacturing | 2025 |
| Carrington-Wells Holdings Ltd | Financial services | 2020 |
| Cassie Contracts Ltd | Information & communication | 2025 |
| Catalyst International Limited | Professional & scientific | 1986 |
| Caunton Manor Equestrian LLP | | 2016 |
| Cavendish Property Group Ltd | Real estate | 2018 |
| Cawdron Property Management Ltd | Real estate | 2024 |
| CBN Maintenance Ltd | Construction | 2022 |
| CC Civils and Construction Ltd | Construction | 2024 |
| Cdbm Associates Ltd | Real estate | 2018 |
| Cdbm Properties Ltd | Real estate | 2025 |
| CDN Mortgages Limited | Financial services | 2018 |
| CDN Property Investments Ltd | Real estate | 2023 |
| CE Jubb Investments Ltd | Real estate | 2025 |
| Ceiriog Valley Apartments Management Company Ltd | Households | 2021 |
| Celebrity Creations Services Ltd | Other services | 2022 |
| Central Buy 2 Lets Limited | Real estate | 2022 |
| Central Buy 2 Lets Retford Limited | Real estate | 2025 |
| Central Property Retford Ltd | Real estate | 2021 |
| Centre Barks Doncaster Ltd | Other services | 2025 |
| Cerulean Grey Limited | Professional & scientific | 2017 |
| CF & AM Walter Limited | Professional & scientific | 2012 |
| CF Construction (Collingham) Limited | Construction | 1980 |
| CF Property Limited | Construction | 2015 |
| CF Surfacing Ltd | Construction | 2023 |
| Cfhr 2024 Limited | Administrative & support | 2020 |
| Cfpm 2024 Limited | Real estate | 2013 |