| Clarke IT Consultants Limited | Information & communication | 2007 |
| Class Twenty Locomotives Limited | Transport & logistics | 2002 |
| Classic Restorations (Sales) Limited | Wholesale & retail | 2000 |
| Classic Restorations (Spares) Limited | Professional & scientific | 2001 |
| Clear Vision Direct Limited | Health & social care | 2005 |
| Clifton Limited | Construction | 2018 |
| CLP Engineering Limited | Administrative & support | 1997 |
| Co Tops Limited | Manufacturing | 1995 |
| Coaching Transition Ltd | Health & social care | 2023 |
| Cogent Financial Planning Limited | Financial services | 2004 |
| Coleman PTL Ltd | Construction | 2022 |
| Collett Hulance LLP | | 2008 |
| Collingdon Court Limited | Real estate | 1994 |
| Colpac Limited | Manufacturing | 1937 |
| Commercial Transport Training Limited | Education | 2003 |
| Comprehensive Security Services Limited | Administrative & support | 2004 |
| Compuwise Limited | Real estate | 1987 |
| Conroy Drylining Limited | Construction | 2007 |
| Consolidated Ventures Limited | Information & communication | 2003 |
| Consumer Protection Association | Other services | 1993 |
| Contact Lens Precision Laboratories Limited | Professional & scientific | 1967 |
| Copart Europe Limited | Financial services | 2007 |
| Copperfield Wealth Limited | Financial services | 2026 |
| Cotec (Solvents) Limited | | 1977 |
| Cottenden Limited | Manufacturing | 1960 |
| Country Vehicles Limited | Wholesale & retail | 2000 |
| Cowan Recovery Limited | Administrative & support | 1977 |
| Cowley Holmes Accountants (Bedford) LLP | | 2001 |
| Craddock Electrical Services Limited | Construction | 2003 |
| Crescentone Software Limited | Information & communication | 1974 |
| Cristec Security Designs Limited | Administrative & support | 1981 |
| Crofts & Findlay | | 2005 |
| Cromptons Contracts Ltd | Construction | 2021 |
| Cromptons Properties Ltd | Households | 2023 |
| Crowley Care Homes Limited | Health & social care | 2008 |
| Culham Lodge Apartments Ltd | Real estate | 2005 |
| Cut-A-Way (UK) Limited | Construction | 2007 |
| CWM Accounting Services Limited | Professional & scientific | 2005 |
| D & K Autos LLP | | 2006 |
| D & S Homes Limited | Construction | 2003 |
| D J Pike Plumbing & Heating Ltd. | Construction | 2002 |
| D J Supermarket Ltd | Wholesale & retail | 2004 |
| D Lloyd-Jones Ltd | Other services | 2008 |
| D P Heating Limited | Construction | 2005 |
| D&G Management Services Ltd | Other services | 2026 |
| D.H.T. Limited | Construction | 1991 |
| Daedalus Sales and Marketing Consultants Limited | Administrative & support | 2007 |
| Daniels Bros (Shefford) Limited | Construction | 1970 |
| Dark Horses Limited | Wholesale & retail | 1999 |
| Datapower International College Limited | Information & communication | 1994 |
| David French Partnership LLP | | 2010 |
| David Nott & Sons Limited | Construction | 1978 |
| Davison & Co. (Holdings) Limited | Financial services | 2025 |
| Davison & Co. (Newco) Limited | Real estate | 2025 |
| Davison & Co. (Potco) Limited | Agriculture & fishing | 2025 |
| Davison & Co. Barford (Anthony Co.) Limited | Financial services | 2025 |
| Davison & Co. Barford (Anthony) Holdco Limited | Financial services | 2025 |
| Davison & Co. Barford (Charles Co.) Limited | Financial services | 2025 |
| Davison & Co. Barford (Charles) Holdco Limited | Financial services | 2025 |
| Davison & Co. Barford (Edward Co.) Limited | Financial services | 2025 |
| Davison & Co. Barford (Edward) Holdco Limited | Financial services | 2025 |
| Davison & Co. Barford (Gary Co.) Limited | Financial services | 2025 |
| Davison & Co. Barford (Gary) Holdco Limited | Financial services | 2025 |
| Davison & Co. Barford (Potco) Holdco Limited | Financial services | 2025 |
| DBS Demolition Services Limited | Construction | 2007 |
| DE Havilland Moth Club (1925) Ltd | Wholesale & retail | 2000 |
| Delicious Pizza (Kettering) Limited | Wholesale & retail | 2000 |
| Dent Master Ltd. | Wholesale & retail | 2003 |
| Derngate Securities Limited | | 1968 |
| Design Original Ltd | Administrative & support | 2002 |
| Desofil (U.K) Limited | Construction | 2007 |
| Devine Properties 888 Ltd | Real estate | 2024 |
| DFG Utilities Ltd | Construction | 2026 |
| Diadem Domiciliary Care Ltd. | Health & social care | 2021 |
| Diamondrus Consultancy Limited | Real estate | 2001 |
| Digital Golfing Ltd | Professional & scientific | 2016 |
| Direct Glazing Limited | Manufacturing | 1993 |
| Disctown Limited | | 1980 |
| DJL Windows Limited | Construction | 2002 |
| DKK Property Hub Ltd | Real estate | 2026 |
| DNA Construct Ltd | Construction | 2017 |
| Doonsville Management Limited | Real estate | 1988 |
| Downstream Environmental Engineering Limited | Manufacturing | 2002 |
| DR Ngozi Oluonye Paediatric Consulting Limited | Health & social care | 2019 |
| DR. Phil's Gardening Services Limited | Administrative & support | 2004 |
| Driveway Rejuvenation Limited | Construction | 2007 |
| DTS Financial Solutions Ltd | Professional & scientific | 2024 |
| Dumont Training Limited | Education | 2004 |
| Dunstable Discount Limited | Wholesale & retail | 2003 |
| Dunstable Glass Company Limited | Construction | 1969 |
| DW IT Consultancy Limited | Information & communication | 2011 |
| Dynasty Properties Limited | Professional & scientific | 2002 |
| E&J Resource Ltd | Health & social care | 2019 |
| Easyjet Airline Company Limited | Transport & logistics | 1995 |
| Ebuildit.Co.Uk Limited | Information & communication | 2000 |
| Education Advice Limited | Education | 2000 |
| Edward J. Frazier Ltd | Construction | 2007 |
| EGY Equine and Transport Services Ltd | Transport & logistics | 2024 |
| EJD Solutions Limited | Professional & scientific | 2006 |
| Ekimdenizozen Ltd | Professional & scientific | 2019 |