| CMC (Igroup) Limited | Real estate | 2019 |
| CMC Commercial 2 Ltd | Real estate | 2019 |
| CMC Lettings (NW) Ltd | Real estate | 2024 |
| Cmcd Limited | Administrative & support | 2019 |
| Cmclc Ltd | Professional & scientific | 2025 |
| CMH Property Rentals Limited | Real estate | 2026 |
| CMJ (NW) Limited | Administrative & support | 2019 |
| Cmjmlv LLP | | 2024 |
| CMM Civils & Rail Limited | Construction | 2014 |
| CMR Property Ltd | Real estate | 2024 |
| CNC (Preston) Holdings Limited | Construction | 2021 |
| CNC Modeller Ltd | Information & communication | 2026 |
| CND Autos Ltd | Wholesale & retail | 2025 |
| Cnergy Limited | Information & communication | 2018 |
| CNM Autos Ltd | Wholesale & retail | 2022 |
| Cnvrt UK Limited | Professional & scientific | 2024 |
| CNY Building & Landscaping Limited | Administrative & support | 2023 |
| Co Health Consultancy Ltd | Health & social care | 2023 |
| Co-Lab IT Ltd | Information & communication | 2025 |
| CO4 Limited | Administrative & support | 2017 |
| Coach Hire Executive Travel Ltd | Transport & logistics | 2002 |
| Coach House Mews Management Company Limited | Households | 1993 |
| Coach.Consult.Results Ltd | Professional & scientific | 2024 |
| COACH4IMPROVEMENT Care Consultancy Ltd | Professional & scientific | 2022 |
| Coachcraft Limited | Extraterritorial | 2012 |
| Coaching by Mind Mail Limited | Administrative & support | 2018 |
| Coaching Works 4 ME Limited | Education | 2011 |
| Coalfields Growth Fund | | 2009 |
| Coars (N.E.) Limited | Other services | 2009 |
| Coastal Fabrications Limited | Manufacturing | 2001 |
| Coastal Retail Limited | Wholesale & retail | 2017 |
| Coates Commercial Services Ltd | Professional & scientific | 2018 |
| Cobblers Garstang Ltd | Hospitality | 2024 |
| Cobco (450) Limited | Administrative & support | 2002 |
| Cobco (494) Limited | Financial services | 2002 |
| Cobra WCB Limited | Arts & recreation | 2019 |
| Cobrec Limited | Manufacturing | 2014 |
| Coburg Quay Management Company Limited | Households | 1997 |
| Cobyex Limited | Information & communication | 2012 |
| Cocker Property Holdings Limited | Real estate | 2019 |
| Cockerham Management Company Limited | Households | 2020 |
| Coco Eats (Preston) Ltd | Hospitality | 2025 |
| Cocoa Coffee Ltd | Manufacturing | 2025 |
| Coconut (NW) Ltd | Hospitality | 2019 |
| Coddington Bracewell Limited | Agriculture & fishing | 2026 |
| Code Connect Ltd | Information & communication | 2023 |
| Code Creative Limited | Information & communication | 2016 |
| Codeshift Ltd | Information & communication | 2013 |
| Coentry Partners Limited | Information & communication | 2025 |
| Coggin Sustainable Office Solutions Limited | Manufacturing | 2017 |
| Coggon Properties Ltd | Real estate | 2026 |
| Cognitive Computing Limited | Information & communication | 1994 |
| Cogvita Ltd | Wholesale & retail | 2024 |
| COI Contracts Limited | Administrative & support | 2025 |
| Cojac Limited | Administrative & support | 2004 |
| Cojoe Ltd | Information & communication | 2017 |
| Col.Lab - Collaboration Laboratory Ltd | Professional & scientific | 2021 |
| Cold Touch UK Limited | Other services | 2011 |
| Coldham Group Ltd | Construction | 2025 |
| Cole and Lopez Ltd | Arts & recreation | 2018 |
| Cole Optical Ltd | Professional & scientific | 2024 |
| Cole's Homes Limited | Real estate | 2019 |
| Coleman and Pearce Ltd | Hospitality | 2019 |
| Coleman Logistics Ltd | Transport & logistics | 2024 |
| Coletel Limited | Administrative & support | 2013 |
| Coley's Beauty Ltd | Other services | 2025 |
| Colin Bradley Ltd | Agriculture & fishing | 1990 |
| Colin Gelsthorpe Agencies Limited | Wholesale & retail | 2002 |
| Colin Turberfield Ltd | Construction | 2017 |
| Collaborate CBT Ltd | Health & social care | 2021 |
| Collagen Booster Ltd | Wholesale & retail | 2021 |
| Collateral Sky Build Ltd | Construction | 2021 |
| Collcon Projects Holdings Ltd | Financial services | 2018 |
| Collcon Projects Ltd | Construction | 1996 |
| Collectable Guild Ltd | Wholesale & retail | 2025 |
| Collectif and Then... | Arts & recreation | 2012 |
| Collectors’ Cabin Ltd | Wholesale & retail | 2025 |
| Collins Developments North Ltd | Construction | 2024 |
| Collins Property Ltd | Real estate | 2017 |
| Collinson Besthall Ltd | Construction | 1992 |
| Collinson Holdings Garstang Ltd | Financial services | 2024 |
| Collinson Joinery Construction Ltd | Manufacturing | 2005 |
| Collinwood Gardens Management Company Limited | Real estate | 2017 |
| Collinwood Property Developments Ltd | Real estate | 2016 |
| Colnago Ltd | Transport & logistics | 1998 |
| Colo Care General Surgical Services Limited | Health & social care | 2019 |
| Colombia Roasteries Limited | Manufacturing | 2020 |
| Coloproctology Limited | Health & social care | 2010 |
| Color ME Beautiful Ltd | Extraterritorial | 2007 |
| Colour ME Beautiful Cosmetics Ltd | Extraterritorial | 2015 |
| Colour ME Beautiful Ltd | Extraterritorial | 2007 |
| Colourful Life Ltd | Manufacturing | 2022 |
| Combat Performance Academy Whalley Ltd | Arts & recreation | 2021 |
| Comfort Stay BPL Ltd | Hospitality | 2023 |
| Comfort World Ltd | Wholesale & retail | 2025 |
| Comfortable Living Limited | Construction | 2006 |
| Comitted Ltd | Wholesale & retail | 2024 |
| Command Health Limited | Health & social care | 2015 |
| Commerce Foundry Limited | Professional & scientific | 2026 |
| Commerce Palace Ltd | Wholesale & retail | 2025 |