| Cognovo Consulting Ltd | Information & communication | 2019 |
| Cohezhion Ltd | Professional & scientific | 2010 |
| Colci Ltd | Education | 2025 |
| Cold Morning Limited | Construction | 2007 |
| Cole & Co (Accountants) Limited | Professional & scientific | 2002 |
| Coleridge Lodge Limited | Households | 1985 |
| Coles Precision Engineering Ltd | Manufacturing | 2025 |
| Coles Upholstery Service Limited | Other services | 2011 |
| Colin Vass Gardener Limited | Administrative & support | 2013 |
| Colins Retail Limited | Wholesale & retail | 2025 |
| Collaborate Interact Entertain Limited | Wholesale & retail | 2025 |
| Collacott Limited | Hospitality | 2016 |
| Collar Close Management Limited | Households | 2025 |
| College Street (Kempston) Management Co Limited | Households | 2007 |
| College Street Motors Limited | Wholesale & retail | 2010 |
| Collett Hulance Accountants Limited | Professional & scientific | 2021 |
| Collins Collins & Co Limited | Professional & scientific | 2015 |
| Collis Civils Ltd | Construction | 2025 |
| Colne Distribution Ltd | Transport & logistics | 2012 |
| Colombe Group Ltd | Construction | 2026 |
| Colossal Health Ltd | Wholesale & retail | 2025 |
| Colour Your Way Ltd | Wholesale & retail | 2025 |
| Colour-Tech Painting & Decorating Services Ltd | Construction | 2022 |
| Colourised Media Ltd | Wholesale & retail | 2025 |
| Colours Events & Entertainment Ltd | Administrative & support | 2025 |
| Columbia Metals Holdings Limited | Financial services | 2016 |
| Columbia Metals Limited | Wholesale & retail | 1961 |
| Colz Limited | Health & social care | 2025 |
| Comaf Studio Ltd | Real estate | 2020 |
| Combined Insulations and Plastics Limited | Manufacturing | 1990 |
| Come Vibes WID WE Ltd | Arts & recreation | 2025 |
| Comercify Ltd | Wholesale & retail | 2025 |
| Comfort Mattress Limited | Wholesale & retail | 2007 |
| Comfort Residence Ltd | Public administration | 2023 |
| Comfortcare Home Services Ltd | Health & social care | 2024 |
| Comfy Corner 29 Limited | Real estate | 2024 |
| Comfy Place Accommodation Ltd | Hospitality | 2024 |
| Comfy Workers Limited | Administrative & support | 2020 |
| Comline Auto Parts Limited | Wholesale & retail | 1988 |
| Comline Holdings Limited | Financial services | 2016 |
| Commercial & Construction Services Ltd | Professional & scientific | 2022 |
| Commercial Contracts Management Limited | Professional & scientific | 2013 |
| Commercial EPC Group Ltd | Administrative & support | 2022 |
| Commercial Interior Design Limited | Construction | 2007 |
| Commercial Interiors and Storage Ltd. | Construction | 1976 |
| Commodity Prospector Limited | Administrative & support | 2009 |
| Commodoreplus Limited | Administrative & support | 2016 |
| Common Farm Lane Management Limited | Households | 2012 |
| Comms Buyer Network Ltd | Extraterritorial | 2012 |
| Community Access Support Services Limited | Health & social care | 2015 |
| Community Radio Awards Ltd | Administrative & support | 2016 |
| Community Social Work, Welfare and Justice Centre Ltd | Health & social care | 2015 |
| Community Soil CIC | Professional & scientific | 2025 |
| Community Voluntary Service Bedfordshire | Health & social care | 2001 |
| Compass Land & Property Limited | Construction | 2013 |
| Compass Solutions (UK) Limited | Information & communication | 2014 |
| Compasses Greenfield Ltd | Hospitality | 2025 |
| Compassionate Care Solutions Ltd | Health & social care | 2025 |
| Complete Accounts and Tax Ltd | Professional & scientific | 2013 |
| Complete Adolescents Provisions Ltd | Other services | 2018 |
| Complete IT Solution Ltd | Information & communication | 2001 |
| Complete Nursing and Care Solutions Ltd | Health & social care | 2006 |
| Complete Organisation Limited | Administrative & support | 2014 |
| Complete Underground Technology Services Limited | Professional & scientific | 2003 |
| Complete Welding Solutions Ltd | Manufacturing | 2019 |
| Complete-Vit Ltd | Manufacturing | 2022 |
| Complex Technology Ltd | Information & communication | 2016 |
| Complyology Ltd | Professional & scientific | 2020 |
| Computer Disposals Limited | Extraterritorial | 2000 |
| Comton Group Ltd | Administrative & support | 2018 |
| COMVERGENCEM2M Limited | Wholesale & retail | 2014 |
| Concept Carpentry Limited | Construction | 2005 |
| Concept Event Solutions Ltd | Arts & recreation | 2019 |
| CONCEPT13 Limited | Professional & scientific | 2014 |
| Concepts in Motion Ltd | Information & communication | 2010 |
| Concordia CG Limited | Construction | 2016 |
| Confetti and Curves Bridal Limited | Wholesale & retail | 2017 |
| Confluence Property Management Ltd | Real estate | 2024 |
| Conker Products Limited | Professional & scientific | 2005 |
| Connection Library Limited | Information & communication | 2017 |
| Conneely Management Limited | Information & communication | 2025 |
| Conodealer Ltd | Wholesale & retail | 2025 |
| Conovo Partners Ltd | Information & communication | 2014 |
| Conquest and Austin Limited | Wholesale & retail | 2015 |
| Conquest Chimney Sweep Limited | Administrative & support | 2023 |
| Conquest Estates Ltd | Hospitality | 2014 |
| Conquest Transport Ltd | Transport & logistics | 2025 |
| Conquest Valley Motorsport Ltd | Arts & recreation | 2021 |
| Conquest Wildman Limited | Information & communication | 1994 |
| Conservation by Design Limited | Manufacturing | 1992 |
| Constant & Co (Bedford) Limited | Public administration | 2010 |
| Constant & Co (Investments) Limited | Professional & scientific | 1985 |
| Constant & Co Limited | Professional & scientific | 2011 |
| Constantinou Property Management Ltd | Real estate | 2019 |
| Construction Buying Factors Ltd | Wholesale & retail | 2019 |
| Construction MK Developments Ltd | Construction | 2021 |
| Construction Projects Recruitment Ltd | Administrative & support | 2018 |
| Construzzo Ltd | Construction | 2024 |
| Consuliving Advisors Ltd | Administrative & support | 2024 |
| Consult West Ltd | Professional & scientific | 2024 |