| Collins Landscaping Limited | Administrative & support | 2015 |
| Colnovus Limited | Information & communication | 2023 |
| Colourtex Limited | Manufacturing | 2003 |
| Colt Hill Media Limited | Professional & scientific | 2023 |
| Combined AI Ltd | Professional & scientific | 2025 |
| Comfort CAB Services Ltd | Transport & logistics | 2025 |
| Comfort Cooling West Midlands Ltd | Energy | 2025 |
| Comfort Reach Furniture Ltd | Wholesale & retail | 2025 |
| Comic Social Ltd | Information & communication | 2026 |
| Commandery Coaches (Worcester) Limited | Transport & logistics | 2012 |
| Commercial Equipment Services Limited | Manufacturing | 1999 |
| Commodity Design Ltd | Professional & scientific | 2022 |
| Common Tongue Group Ltd | Financial services | 2026 |
| Commonwealth Flyfishers Association | Arts & recreation | 2014 |
| Community World Limited | Health & social care | 1993 |
| Comocean Ltd | Information & communication | 2000 |
| Compacdian Limited | Administrative & support | 2021 |
| Company 03051103HOLD Limited | Financial services | 2016 |
| Company for Life Ltd | Information & communication | 2019 |
| Compass Assessment and Training Services Ltd | Health & social care | 2026 |
| Compass Psychology Services Ltd | Health & social care | 2019 |
| Compasss Limited | Administrative & support | 2015 |
| Compco Fire Systems Limited | Construction | 1993 |
| Competitive Future Ltd | Professional & scientific | 2018 |
| Complete Build (Midlands) Ltd | Construction | 2014 |
| Complete DRY Cleaners Limited | Other services | 2013 |
| Complete GAS Heating Ltd | Professional & scientific | 2013 |
| Comply: Amusement Safety Ltd | Professional & scientific | 2017 |
| Comply:Inspection & Measurement Ltd | Professional & scientific | 2020 |
| Comprehensive Financial Solutions Ltd | Professional & scientific | 2025 |
| Computer Cycle Ltd | Wholesale & retail | 2024 |
| Computer House Ltd | Wholesale & retail | 2021 |
| Computer Solutions (Worcester) Limited | Wholesale & retail | 2013 |
| Concurrent Solutions Limited | Manufacturing | 1984 |
| Configurate Limited | Information & communication | 2022 |
| Confluencers International Limited | Professional & scientific | 2022 |
| Conisborough Limited | Real estate | 2025 |
| Connected Automotive Ltd | Wholesale & retail | 2024 |
| Connected Peace Ltd | Professional & scientific | 2025 |
| Connex Property Lettings Ltd | Real estate | 2023 |
| Connex Utility Limited | Construction | 2016 |
| Connexus Products Ltd | Wholesale & retail | 2014 |
| Conservation Chemicals Consultants Limited | Manufacturing | 1987 |
| Consolidated Telecommunications Limited | Information & communication | 2011 |
| Consolo X Limited | Transport & logistics | 2025 |
| Constancia Group Ltd | Information & communication | 2026 |
| Consultancy Management Group Ltd | Administrative & support | 2014 |
| Consultancy Universe Limited | Professional & scientific | 2025 |
| Contemporary Construction Services Ltd | Construction | 2009 |
| Contemporary Development Services Ltd | Construction | 2021 |
| Conteur Ltd | Professional & scientific | 2011 |
| Contract Cleaning Network Ltd | Professional & scientific | 2022 |
| Control Your Mind Ltd | Health & social care | 2026 |
| Controlight Limited | Construction | 2015 |
| Converge IO Solutions Ltd | Information & communication | 2024 |
| Converge IO Technologies Ltd | Information & communication | 2024 |
| Convoy Carriers Limited | Transport & logistics | 2018 |
| Cooksey Green Property Limited | Real estate | 2024 |
| Cool Blue Interiors Limited | Wholesale & retail | 2010 |
| Cool Jacket Coding Limited | Information & communication | 2023 |
| Coolbrook Limited | Real estate | 2003 |
| Coole Source Ltd | Administrative & support | 2026 |
| Coomber Electronics Limited | Manufacturing | 2012 |
| Cooper's Cleans Ltd | Administrative & support | 2023 |
| Coordinated Training Services Limited | Education | 1989 |
| Copper Beech Brewing Company Ltd | Manufacturing | 2019 |
| Copper Beech Commerce Ltd | Wholesale & retail | 2024 |
| Copperfield Property Limited | Real estate | 2023 |
| Copson Services Limited | Information & communication | 2018 |
| Copson Social Ltd | Professional & scientific | 2019 |
| Copymax Limited | Wholesale & retail | 2008 |
| Corb Solutions Ltd | Information & communication | 2024 |
| Cordelis Consulting Limited | Professional & scientific | 2010 |
| Corega Limited | Professional & scientific | 1992 |
| Coremo Automation Limited | Professional & scientific | 1992 |
| Corinium Associates Limited | Information & communication | 2008 |
| Cornel Pirciu Ltd | Transport & logistics | 2025 |
| Corner Inn Limited | Hospitality | 2025 |
| Cornmeadow Early Years and Families Limited | Education | 2015 |
| Cornmill Residents Association Limited | Households | 2007 |
| Cornus Limited | Professional & scientific | 2020 |
| Cornwall Care Limited | Health & social care | 1995 |
| Cornwall Care Property Limited | Construction | 2010 |
| Cornwall Care Services Limited | Health & social care | 2011 |
| Corporate Legal and Advisory Services Limited | Professional & scientific | 2026 |
| Corsica Recruitment Limited | Administrative & support | 2024 |
| Corunna Close Management Limited | Professional & scientific | 2025 |
| Corvus Unmanned Air Services Limited | Information & communication | 2021 |
| Cosmetic Emporium Limited | Wholesale & retail | 2018 |
| Cotswold Catering Services Ltd | Hospitality | 2024 |
| Cotswold Classics Ltd | Hospitality | 2018 |
| Cotswold Housing Ltd | Construction | 2024 |
| Cotswold Renovation and Building Services Limited | Construction | 2025 |
| Cotswold Smartphones Ltd | Information & communication | 2025 |
| Cottrills Commercials Ltd | Wholesale & retail | 2024 |
| Cottrill’S Carpentry Ltd | Manufacturing | 2019 |
| Count Away Ltd | Professional & scientific | 2026 |
| Counter-Fit Events Limited | Administrative & support | 2015 |
| Country House Maintenance Ltd | Construction | 2017 |
| Country House Occasions LLP | | 2011 |