| Businessopedia Limited | Other services | 2019 |
| Butley Developments Limited | Real estate | 2017 |
| Buxton Consulting Ltd | Professional & scientific | 2011 |
| Buxton Funeral Flowers Ltd | Wholesale & retail | 2024 |
| Buy Hearing Aids Ltd | Wholesale & retail | 2020 |
| Buydnd Ltd | Wholesale & retail | 2025 |
| BW FLO Investments Limited | Financial services | 2023 |
| BWD (Stud) LLP | | 2008 |
| BY Tumkeen Limited | Other services | 2023 |
| Byne Business Intelligence Consulting Limited | Professional & scientific | 2015 |
| Byru PMU Ltd | Other services | 2024 |
| Byzantium Advisory Limited | Professional & scientific | 2023 |
| C & a Andrew Property Limited | Real estate | 2018 |
| C & L Mills Consultancy Ltd | Professional & scientific | 2024 |
| C & S Systems UK Limited | Extraterritorial | 2000 |
| C & Scott's Electrical Limited | Construction | 2022 |
| C a H Safety & Training Limited | Professional & scientific | 2019 |
| C F Electrical (UK) Ltd | Information & communication | 2013 |
| C Oldfield Property Limited | Real estate | 2018 |
| C R C Limited | Administrative & support | 2007 |
| C&C Music Ltd | Education | 2022 |
| C&R PVC Solutions Limited | Construction | 2016 |
| C.C.L. Concept and Developments Limited | Professional & scientific | 1999 |
| C.T.S Plumbing & Heating Ltd | Construction | 2015 |
| C.V.K. Recruitment Limited | Administrative & support | 2003 |
| C6H12 Limited | Construction | 2017 |
| Cable Assembly Innovations Ltd | Manufacturing | 2024 |
| Cabo Property Consultants Ltd | Professional & scientific | 2024 |
| Caburn Properties Limited | Administrative & support | 2000 |
| Caddis Limited | Agriculture & fishing | 2008 |
| Cadgas Limited | Construction | 2021 |
| Cadmore Consulting Ltd | Professional & scientific | 2015 |
| Caesar Access Solutions Limited | Professional & scientific | 2014 |
| Cafe Mustard Ltd | Hospitality | 2026 |
| Cafepiebar Ltd | Wholesale & retail | 2018 |
| Caferacer Limited | Professional & scientific | 2007 |
| Cahill Civil Engineering Ltd | Construction | 2006 |
| Cahill Homes & Design Ltd | Construction | 2024 |
| Cairnetic Associates Limited | Professional & scientific | 2022 |
| Callagenix Limited | Information & communication | 2016 |
| Callum Bailey Audio Ltd | Information & communication | 2021 |
| Calson Joinery Limited | Construction | 2018 |
| Calveley Consultants Ltd | Transport & logistics | 2025 |
| CAM Holiday Property Ltd | Real estate | 2024 |
| Cambrian Road Limited | Real estate | 2015 |
| Camp Broadway Limited | Health & social care | 2022 |
| Campervans 4 FUN Ltd | Administrative & support | 2013 |
| Canalside Community Radio Limited | Information & communication | 2004 |
| Cancer Communications and Consultancy Limited | Professional & scientific | 2004 |
| Candoo Limited | Wholesale & retail | 2004 |
| Canine Club Limited | Professional & scientific | 2009 |
| Cann Holdings Ltd | Real estate | 2017 |
| Canterbury Student Lets Ltd | Real estate | 2019 |
| Cape Cowley Publishing Ltd | Information & communication | 1997 |
| Capital Alpaca Ltd | Other services | 2019 |
| Capital Investments (ST) Ltd. | Wholesale & retail | 2024 |
| Capri's Buxton Limited | Hospitality | 2018 |
| Caps Financial Limited | Financial services | 2022 |
| Caps Group Associates Limited | Manufacturing | 2012 |
| Caps Projects UK Ltd | Construction | 2012 |
| Captura Automotive Ltd | Extraterritorial | 2012 |
| Captura Resourcing Ltd. | Information & communication | 2008 |
| Capture Portraits Limited | Professional & scientific | 2003 |
| Captured Entertainment Ltd | Hospitality | 2023 |
| Car Leasing 247 Ltd | Administrative & support | 2023 |
| Car Loan 4U Limited | Extraterritorial | 2015 |
| Car Parts Warehouse Ltd | Wholesale & retail | 2024 |
| Car Search 2020 Limited | Wholesale & retail | 2020 |
| Caravan Tapas Limited | Hospitality | 2018 |
| Carbay Limited | Wholesale & retail | 2005 |
| Carbinx Technologies UK Limited | Professional & scientific | 2026 |
| Carbon-Jl Ltd | Wholesale & retail | 2019 |
| Carbonwise Thermal Solutions Ltd | Construction | 2025 |
| Cardanat Properties Limited | Extraterritorial | 2014 |
| Cardrona Projects Limited | Professional & scientific | 2021 |
| Care Haven (UK) Ltd | Health & social care | 1999 |
| Care Synergy Ltd | Information & communication | 2024 |
| Career Assist Ltd | Administrative & support | 2024 |
| Careers Advice North West Ltd | Education | 2020 |
| Carepathpartners Ltd | Administrative & support | 2026 |
| Caring Hearts Home Help Ltd | Health & social care | 2025 |
| Carly Haigh Consulting Ltd | Professional & scientific | 2015 |
| Caroo Ltd. | Administrative & support | 2016 |
| Carpenters Court Management Limited | Households | 1983 |
| Carpet Clearance Macclesfield Ltd | Wholesale & retail | 2025 |
| Carpet Trade Supplies (Macclesfield) Limited | Wholesale & retail | 1991 |
| Carrkemp Property Limited | Real estate | 2020 |
| Carroll-Aviation Ltd | Transport & logistics | 2015 |
| Carrwood Legal Search Ltd | Administrative & support | 2024 |
| Carson QA & Compliance Limited | Professional & scientific | 2026 |
| Carter Knowles Limited | Real estate | 2008 |
| Carter Roofing Limited | Construction | 2022 |
| Carterbench Product Development Limited | Professional & scientific | 1992 |
| Cartmell Tennis Coaching Ltd | Arts & recreation | 2025 |
| CAS Metals Ltd | Water & waste | 2025 |
| Casa Falcao Limited | Extraterritorial | 2019 |
| Casa Palm Manor Ltd | Real estate | 2025 |
| Casellis Electrical Ltd | Construction | 2025 |
| Cash Perks Ltd | Administrative & support | 2020 |
| Cashel Court Management Company Limited | Households | 2004 |