| Creative Furniture & Distribution Ltd | Wholesale & retail | 2021 |
| Creative Protection Services Ltd | Professional & scientific | 2020 |
| Creen International Limited | Professional & scientific | 2007 |
| Crimesecure Limited | Administrative & support | 1993 |
| Criterai Ltd | Information & communication | 2025 |
| Crockwell Farm LLP | | 2019 |
| Crofts Estates Limited | Construction | 2020 |
| Cross Lane Storage Ltd | Administrative & support | 2025 |
| CROSSEAGLE23 Logistics Ltd | Education | 2024 |
| Crown Construction Consultants Limited | Professional & scientific | 2013 |
| Crowning Glory Hairdressing Ltd | Other services | 2021 |
| Crucis Consulting Limited | Information & communication | 2008 |
| Crystal Care Cleaning Solutions Ltd | Administrative & support | 2026 |
| Crystal Green Fencing and Landscaping Ltd | Administrative & support | 2025 |
| CSORD1011 Ltd | Transport & logistics | 2025 |
| CTG 3D UK Ltd | Information & communication | 2023 |
| Cubic Data Technologies Ltd. | Information & communication | 2010 |
| Culaccino Limited | Hospitality | 2016 |
| Cummins Communications Limited | Information & communication | 2024 |
| Custom Built Solutions Limited | Information & communication | 2019 |
| Custom Cages Limited | Manufacturing | 2000 |
| Custom Performance Ltd | Financial services | 2025 |
| Cutting Edge Tree Services Ltd | Administrative & support | 2024 |
| CVA Brick Building Ltd | Construction | 2022 |
| Cwks Limited | Transport & logistics | 2015 |
| CWL Business Solutions Ltd | Professional & scientific | 2021 |
| D Barry Psychological Services Ltd | Health & social care | 2024 |
| D H Lawrence Ltd | Professional & scientific | 2013 |
| D Welch Electrical Services Limited | Construction | 2018 |
| D&E International Trading Limited | Professional & scientific | 2014 |
| D&H International Architecture & Landscape Design Limited | Professional & scientific | 2008 |
| DA Roberts Accountancy Services Limited | Professional & scientific | 2010 |
| Daily Brands Ltd | Professional & scientific | 2015 |
| Daisy B'S Boutique Limited | Wholesale & retail | 2018 |
| Daisy MP Limited | Arts & recreation | 2024 |
| Dally Drive Transport Limited | Other services | 2023 |
| DAN Bull Building and Groundworks Ltd | Construction | 2001 |
| DAN Holland Racing Limited | Arts & recreation | 2020 |
| Danelaw Laminates Limited | Transport & logistics | 1981 |
| Danetre Abbey Limited | Real estate | 2009 |
| Danetre Glass Ltd | Construction | 2018 |
| Danetre Health Products Limited | Health & social care | 2007 |
| Danetre Packaging Limited | | 1980 |
| Danetre Workshop Supplies Limited | Wholesale & retail | 2002 |
| Daniel Adam Ltd | Education | 2025 |
| Danila Trans Limited | Transport & logistics | 2018 |
| Danway Properties Bham Ltd | Real estate | 2026 |
| Dany Plant Ltd | Administrative & support | 2021 |
| DAQ Analytic Services Ltd | Professional & scientific | 2022 |
| Daridav Services Ltd | Transport & logistics | 2025 |
| Dariusz Kapusniak Limited | Wholesale & retail | 2016 |
| Data Consulting Practice Ltd | Information & communication | 2019 |
| Data Consulting Services Limited | Wholesale & retail | 2008 |
| Datec Holdings Limited | Financial services | 2018 |
| Davco Limited | Hospitality | 2022 |
| Daventry & District Golf Club Limited | Arts & recreation | 2023 |
| Daventry 3D Printing Ltd | Manufacturing | 2024 |
| Daventry Construction Ltd | Construction | 2023 |
| Daventry District Welfare Foundation | Other services | 2010 |
| Daventry Double Glazing Limited | Professional & scientific | 2015 |
| Daventry Food Station NO 1 Ltd | Hospitality | 2016 |
| Daventry Gold and Cars Ltd | Wholesale & retail | 2025 |
| Daventry Indoor Bowling Club Limited | Arts & recreation | 1997 |
| Daventry Kebab Ltd | Hospitality | 2024 |
| Daventry Light Haulage Company Limited | Transport & logistics | 2020 |
| Daventry Masonic Club Management Company Ltd | Other services | 2026 |
| Daventry Metal Finishers Limited | Manufacturing | 2011 |
| Daventry Metal Products Limited | Manufacturing | 1978 |
| Daventry Mobiles Ltd | Wholesale & retail | 2025 |
| Daventry Mowers Ltd | Manufacturing | 2023 |
| Daventry Non-Ferrous Metals Limited | Wholesale & retail | 2021 |
| Daventry Property Investments Limited | Real estate | 2017 |
| Daventry Refrigeration Limited | Administrative & support | 2007 |
| Daventry Rugby Football Club Limited | Arts & recreation | 2010 |
| Daventry Spas & Hot Tubs Limited | Manufacturing | 2022 |
| Daventry Thermoforming (UK) Limited | Manufacturing | 1992 |
| Daventry Town Bowling Club | Arts & recreation | 2012 |
| Daventry Used Car Centre Ltd | Wholesale & retail | 2016 |
| Daventry Vape Store Ltd | Wholesale & retail | 2026 |
| Daventry Vaping Co Ltd | Wholesale & retail | 2020 |
| Daventry Welding Company Limited | Financial services | 2012 |
| Daventry Windows Limited | Extraterritorial | 2015 |
| Daventrylandscaping Ltd | Professional & scientific | 2026 |
| David Auto Parts Ltd | Wholesale & retail | 2020 |
| David Cosby Limited | Real estate | 2006 |
| David Ridley Artist Ltd | Arts & recreation | 2016 |
| Davis Paving Limited | Construction | 2014 |
| Davisa Solutions Limited | Professional & scientific | 2024 |
| Dawn Collins Training Ltd | Administrative & support | 2016 |
| Day 2 Services Ltd | Wholesale & retail | 2022 |
| DB Consulting Ltd | Professional & scientific | 2021 |
| DC Hassall Electrical Contractors Limited | Construction | 2012 |
| DCA Property Limited | Construction | 2025 |
| DCS Digital Limited | Information & communication | 2017 |
| DCS Technology Limited | Information & communication | 2017 |
| DE Home Improvements Ltd | Manufacturing | 2023 |
| Deafconnect | Health & social care | 2007 |
| Deakin and Daughters Limited | Real estate | 2026 |
| Dealers in Performance 4X4 Limited | Wholesale & retail | 2006 |
| Dean Cleaver Carpentry and Training Services Limited | Construction | 2016 |