| Bridgedale Gardens Limited | Households | 2023 |
| Bridgewell Corporate Communication Limited | Professional & scientific | 2002 |
| Britpave Barrier Systems Limited | Professional & scientific | 2011 |
| Bromley & Dadford Associates Limited | Professional & scientific | 2001 |
| Brooke Hill Academy Trust Limited | Education | 2011 |
| Brown & Jones Limited | Construction | 2002 |
| Bruce Morton Associates Ltd | Professional & scientific | 2023 |
| Brunel Partnership Limited | Construction | 2001 |
| Buckland Road Industrial Estate (Leicester) Ltd | Real estate | 2025 |
| Buddha Bar & Brew Limited | Wholesale & retail | 2026 |
| Build IT (Leicester) Limited | Construction | 2009 |
| Burge Group Ltd | Construction | 2022 |
| Burghley Facilities Management Ltd | Administrative & support | 2015 |
| Burkitt Communications Ltd | Other services | 2011 |
| Burley Management Company Limited(The) | Households | 1984 |
| Bushby Engineering Ltd | Manufacturing | 2014 |
| Business Directory Promotions Limited | Information & communication | 2010 |
| Busy Bush Ltd | Information & communication | 2025 |
| C & C Lawncare Limited | Administrative & support | 2003 |
| C Allen Groundworks & Landscaping Ltd | Construction | 2024 |
| C S Ellis Logistics Limited | Transport & logistics | 1965 |
| C&D Wright Property Ltd | Real estate | 2026 |
| C(Uk) Logistics Limited | Administrative & support | 2015 |
| C.H.Hollis Limited | Agriculture & fishing | 1944 |
| C.S. Ellis (Holdings) Limited | Professional & scientific | 2013 |
| Cakehead Limited | Manufacturing | 2004 |
| Caladailskills Limited | Administrative & support | 2024 |
| Call of Crows Limited | Information & communication | 2025 |
| Calveo Ltd | Other services | 2018 |
| Cambria Sound Limited | Information & communication | 2016 |
| Cambridge Angels Group Ltd | Other services | 2018 |
| Cambridge Angels Ltd | Other services | 2021 |
| Campervanology Limited | Administrative & support | 2024 |
| Canine Training Group Ltd | Other services | 2025 |
| Cardiatec Biosciences Ltd | Professional & scientific | 2021 |
| Care Halos Community CIC | Other services | 2025 |
| Carfanz Ltd | Other services | 2023 |
| Carl Stevenson Builders Limited | Construction | 2025 |
| Carole Sandhu Limited | Wholesale & retail | 2020 |
| Caroline Hudson Limited | Professional & scientific | 2013 |
| Carr Restoration Limited | Construction | 2010 |
| Case Plumbing & Heating Limited | Construction | 2004 |
| Castle Car Care Limited | Wholesale & retail | 2016 |
| Castle Dataware Limited | Manufacturing | 1999 |
| Catherine Airey Limited | Arts & recreation | 2024 |
| Catmose Animal Health Ltd | Professional & scientific | 2023 |
| Catmose Park Road Limited | Real estate | 2023 |
| Cavell Taylor Holdings Limited | Financial services | 2021 |
| Cavell Travel Limited | Administrative & support | 2011 |
| CC13 Ltd | Professional & scientific | 2022 |
| CCB Investments Limited | Other services | 2021 |
| Celestial View Limited | Hospitality | 2021 |
| Centre for Electroneurodiagnostics Ltd | Professional & scientific | 2020 |
| Ceylon Clothing Company Ltd | Wholesale & retail | 2025 |
| Chalfont Classic Cuisine Limited | Hospitality | 2002 |
| Challenger (Financial Literacy) Ltd | Education | 2025 |
| Chancenumber Limited | Arts & recreation | 1992 |
| Change Agents UK Charity | Administrative & support | 2004 |
| Change Agents UK Trading Ltd | Administrative & support | 2008 |
| Chapel Close Residents Ltd | Real estate | 2002 |
| Chapel Consulting Ltd | Information & communication | 2024 |
| Charlie's Paddock Management Company Limited | Real estate | 1998 |
| Charrington Cars Ltd | Wholesale & retail | 2014 |
| Chater Advisory Limited | Real estate | 2026 |
| Chatsworth Legal Management Services Limited | Professional & scientific | 2002 |
| Cherry Turbine Repir Ltd | Manufacturing | 2026 |
| Chicbuy Limited | Wholesale & retail | 2025 |
| Chietech Ltd | Administrative & support | 2019 |
| Chipperfields Circus Limited | Arts & recreation | 2019 |
| Chody Limited | Financial services | 2008 |
| Chois Oakham Limited | Hospitality | 2025 |
| Chris Foers Limited | Construction | 2006 |
| Chris's Childcare Limited | Health & social care | 2019 |
| Christmas in Uppingham CIC | Administrative & support | 2024 |
| Christopher Linnett Limited | Other services | 2013 |
| Christopher Simpson Landscape Design Ltd | Administrative & support | 2018 |
| Chunic Ltd | Wholesale & retail | 2013 |
| Church Farm (Exton) Management Company Limited | Households | 2005 |
| Church Farm (Whissendine) Management Company Limited | Households | 2002 |
| Church Growth Trust Limited | Real estate | 2010 |
| Church Lane (Seaton) Management Limited | Real estate | 2006 |
| Cielo Costa Limited | Information & communication | 2013 |
| Citadel Civils Ltd | Construction | 2025 |
| CJM Coaching Ltd | Health & social care | 2023 |
| CJO Construction Consultants Ltd | Professional & scientific | 2017 |
| CJS Governance Limited | Public administration | 2026 |
| CJT Holdings Limited | Professional & scientific | 2004 |
| Ckbss Limited | Professional & scientific | 2009 |
| CKC Projects Limited | Construction | 2015 |
| Clarion Accountancy and Taxation Limited | Professional & scientific | 2017 |
| Clarke PR and Media Limited | Professional & scientific | 2019 |
| Clayton Private Hire Ltd | Transport & logistics | 2023 |
| CLC Fabrications Ltd | Manufacturing | 2023 |
| Clean Your Teeth Limited | Administrative & support | 2008 |
| Clegg Aust Investments Ltd | Real estate | 2026 |
| Clevecolne Limited | Construction | 1962 |
| Climate Tech Consulting Ltd | Extraterritorial | 2020 |
| Climate Tech Investments Ltd | Extraterritorial | 2020 |
| Climate Tech Ltd | Extraterritorial | 2020 |
| Clipper Coaching and Consulting Ltd | Information & communication | 2022 |