| Community on Solid Ground | Arts & recreation | 2010 |
| Community Pride Community Interest Company | Health & social care | 2015 |
| Community Rehabilitation Services Ltd | Health & social care | 2025 |
| Community Resonance CIC | Education | 2024 |
| Community Revival (UK) Limited | Education | 2006 |
| Community Safety Education CIC | Education | 2021 |
| Community Steps Ltd | Education | 2020 |
| Community Support Plus Ltd | Real estate | 2001 |
| Community Thriving Together CIC | Health & social care | 2023 |
| Community Transformation Action (CTA) CIC | Arts & recreation | 2025 |
| Community Web Initiative Limited | Information & communication | 2014 |
| Community Women's Network CIC | Health & social care | 2025 |
| Community-Minded Ltd | Health & social care | 2011 |
| Communo CIC | Health & social care | 2026 |
| Commversant Limited | Education | 2020 |
| Como Cutz Limited | Other services | 2020 |
| Comock Limited | Wholesale & retail | 2025 |
| Comor Ltd | Wholesale & retail | 2026 |
| Compagnie DES Desserts Limited | Wholesale & retail | 2004 |
| Companies Insight Ltd | Administrative & support | 2025 |
| Companies Made Today Ltd | Professional & scientific | 2023 |
| Companions Home Support Services Ltd | Health & social care | 2022 |
| Company 2M for Trading Ltd | Wholesale & retail | 2025 |
| Company ABC Limited | Administrative & support | 2017 |
| Company Chameleon Limited | Education | 2009 |
| Company Consulting Services Limited | Administrative & support | 2016 |
| Company Four MCR Ltd | Arts & recreation | 2021 |
| Company Matters Ltd | Professional & scientific | 2012 |
| Company Tutoring Limited | Extraterritorial | 1997 |
| COMPANY38 Ltd | Real estate | 2023 |
| Compare Franchises Ltd | Professional & scientific | 2022 |
| Compare the Deals Limited | Wholesale & retail | 2026 |
| Compare Yields Ltd | Other services | 2022 |
| Compare Your Car Lease Ltd | Administrative & support | 2019 |
| Compared Life Ltd | Financial services | 2016 |
| Comparenurseries.Com Ltd | Education | 2010 |
| Comparethestones Limited | Information & communication | 2025 |
| Compass & Cross Trading Company Limited | Wholesale & retail | 2026 |
| Compass Arabia Ltd | Construction | 2021 |
| Compass Consultancy (NW) Limited | Health & social care | 2010 |
| Compass Electrical Limited | Construction | 2001 |
| Compass EU Logic Ltd | Information & communication | 2025 |
| Compass Expert Services Ltd | Professional & scientific | 2025 |
| Compass Financial (UK) Holdings Limited | Financial services | 2023 |
| Compass Financial (UK) Limited | Financial services | 2009 |
| Compass for International Trading Limited | Extraterritorial | 2026 |
| Compass Manpower Solutions Ltd | Construction | 2025 |
| Compass Medical and Education Ltd | Education | 2025 |
| Compass Rightmove UK Limited | Real estate | 2018 |
| Compass Training Group Ltd | Education | 2021 |
| Compassion Medical Staffing Limited | Administrative & support | 2026 |
| Compassionate and Wellness Centre CIC | Health & social care | 2026 |
| Compassionnet Care Limited | Health & social care | 2024 |
| Compcare Compressed Air Ltd | Other services | 2007 |
| Competence Education and Training Academy Ltd | Education | 2019 |
| Complement Ltd | Health & social care | 2023 |
| Compleo Health Limited | Health & social care | 2021 |
| Complete Accounts Office Solutions Limited | Professional & scientific | 2005 |
| Complete Acoustics Solutions Ltd | Extraterritorial | 2019 |
| Complete Caboodle Limited | Wholesale & retail | 2010 |
| Complete Construction and Property Consultants Limited | Professional & scientific | 2024 |
| Complete Contract Lifting Services Ltd | Construction | 2020 |
| Complete Cutting Services Limited | Construction | 2021 |
| Complete Dental Solutions Laboratory Limited | Health & social care | 2011 |
| Complete Electrical & Plumbing Services Ltd | Wholesale & retail | 2019 |
| Complete Event Services Limited | Administrative & support | 2025 |
| Complete Fire Solutions NW Ltd | Construction | 2019 |
| Complete Football Ltd | Administrative & support | 2023 |
| Complete Garden Solutions Ltd | Manufacturing | 2024 |
| Complete Home Improvements (NW) Ltd | Construction | 2022 |
| Complete Housing Solutions Limited | Real estate | 2016 |
| Complete Kindness CIC | Health & social care | 2021 |
| Complete Kitchen Fitters Limited | Construction | 2013 |
| Complete Maintenance Services Ltd | Real estate | 2017 |
| Complete Managements Services Ltd | Households | 2023 |
| Complete Office Support Bookkeeping Ltd | Administrative & support | 2010 |
| Complete Payment Solutions Limited | Administrative & support | 2024 |
| Complete Plant Maintenance Engineering Limited | Manufacturing | 1987 |
| Complete Property Logistics Limited | Real estate | 2004 |
| Complete Quality Care MCR Ltd | Health & social care | 2019 |
| Complete Reliability & Diagnostic Maintenance Services Ltd | Other services | 2019 |
| Complete Resilience Limited | Professional & scientific | 2018 |
| Complete Security and Protection Services Ltd | Other services | 2013 |
| Complete Site Skills Ltd | Education | 2023 |
| Complete Spaces Build Limited | Construction | 2026 |
| Complete Steam Solutions Limited | Manufacturing | 2016 |
| Complete Sustainability Solutions Ltd | Professional & scientific | 2017 |
| Complete Training & Assessment Limited | Education | 2013 |
| Complete Training and Assessment Northwest Ltd | Education | 2023 |
| Complete Vehicle Conversions Limited | Wholesale & retail | 2016 |
| Complete Wall Solutions Limited | Construction | 2012 |
| Completely Motoring Limited | Wholesale & retail | 2010 |
| Complex Legal Limited | Professional & scientific | 2016 |
| Complexconsult Ltd | Health & social care | 2025 |
| Compliance and Payments Limited | Public administration | 2025 |
| Compliance Concept Limited | Information & communication | 2019 |
| Compliance Infosec Ltd | Administrative & support | 2013 |
| Compliance Officer Services Limited | Other services | 2025 |
| Compliance Options Limited | Administrative & support | 1999 |
| Compliance Square Limited | Professional & scientific | 2024 |