| Dact Fire and Security Limited | Construction | 2016 |
| Dact Maintenance Limited | Information & communication | 2012 |
| Daily Selections Ltd | Wholesale & retail | 2025 |
| Dailyquest Limited | Professional & scientific | 2016 |
| Daksh Techinfo Ltd | Information & communication | 2023 |
| Dale Connection Driving Solutions Ltd | Transport & logistics | 2025 |
| Dali Chiro Ltd | Health & social care | 2009 |
| Dalton Lodge Management Limited | Health & social care | 1991 |
| Daly&Alex Ltd | Wholesale & retail | 2020 |
| Damash Real Estates Ltd | Real estate | 2023 |
| Dames Rugby Ltd | Real estate | 2023 |
| Damian Transport Ltd | Transport & logistics | 2025 |
| DAN Dixon Consultancy Ltd | Information & communication | 2016 |
| Danado Limited | Information & communication | 2015 |
| Danam Financials Limited | Professional & scientific | 2026 |
| Dandom Properties Limited | Real estate | 2011 |
| Danetre Estates Limited | Real estate | 2023 |
| Danetre Holdings Limited | Professional & scientific | 1986 |
| Dangabman Ltd | Health & social care | 2023 |
| Daniel Findlay Ltd | Professional & scientific | 2026 |
| Daniel James Consulting Ltd | Information & communication | 2011 |
| Danielle House Management Limited | Households | 2007 |
| Daniel’S Photo Studio Limited | Professional & scientific | 2025 |
| Danjon Limited | Transport & logistics | 2023 |
| Danlau Ltd | Information & communication | 1998 |
| Danlavy Trans Ltd | Transport & logistics | 2016 |
| Danlinda Services Limited | Other services | 2015 |
| Danmat Logistics Ltd | Transport & logistics | 2026 |
| Dapitol Investments Ltd | Financial services | 2024 |
| Dapitol Limited | Wholesale & retail | 2018 |
| Darek Schab Car Technician Ltd | Manufacturing | 2025 |
| Darfera Ltd | Information & communication | 2025 |
| Darkink Advertising Limited | Professional & scientific | 2024 |
| Darren Bates Driving Instructor Ltd | Education | 2023 |
| Darren Parmley Limited | Transport & logistics | 2017 |
| Dashing Blades Barbershop Ltd | Other services | 2019 |
| Dashing Dino Limited | Arts & recreation | 2022 |
| Dassaur Productions Ltd | Information & communication | 2023 |
| Data Centre Infrastructure Management Limited | Information & communication | 2022 |
| Data Plumbers Ltd | Information & communication | 2024 |
| Data Quick Limited | Extraterritorial | 2013 |
| Datacell Networks Limited | Information & communication | 2016 |
| Datacurious.Ai Ltd | Information & communication | 2021 |
| Datascrew Ltd | Information & communication | 2022 |
| Daterna Limited | Wholesale & retail | 2012 |
| Davcat Ltd | Transport & logistics | 2020 |
| Dave Ball Painter and Decorator Limited | Construction | 2017 |
| Dave Harrell Angling Limited | Wholesale & retail | 2011 |
| Dave Young Automotive Services Ltd | Manufacturing | 2025 |
| Daventry and District Sports Trading Limited | Arts & recreation | 2016 |
| Daventry Cricket Centre Limited | Arts & recreation | 2026 |
| Daventry Decor Development Limited | Professional & scientific | 2024 |
| Daventry Welding Supplies Limited | Wholesale & retail | 2022 |
| David Dallas Contracting Ltd | Manufacturing | 2026 |
| David Freight Spedition Limited | Transport & logistics | 2016 |
| David Gilkes & Sons Limited | Transport & logistics | 1986 |
| David Head Creative Ltd | Professional & scientific | 2023 |
| David Huck Farms Limited | Real estate | 2008 |
| David J Watts Limited | Agriculture & fishing | 2016 |
| David Liddington (Lutterworth) Limited | Professional & scientific | 1987 |
| David Liddington Limited | Real estate | 1977 |
| David Little Service Ltd | Transport & logistics | 2025 |
| David Pinchen Footcare Limited | Health & social care | 2003 |
| David Spurgeon Ltd | Arts & recreation | 2016 |
| Daviden Interior Finishes Ltd | Construction | 2020 |
| Davillion Design & Build Limited | Real estate | 2004 |
| Davis Commercial Grass Cuts Ltd | Administrative & support | 2025 |
| Davy Capital LLP | | 2007 |
| Dawcourt Limited | Real estate | 1979 |
| Dawson Driving Limited | Transport & logistics | 2018 |
| Daytona Classics Ltd | Wholesale & retail | 2025 |
| DB Card Payment Services Limited | Financial services | 2021 |
| DB Social Care Consultancy Ltd | Health & social care | 2017 |
| DC Furniture Store Limited | Wholesale & retail | 2025 |
| DC Training & Consultancy Ltd | Extraterritorial | 2025 |
| DC14 Ltd | Real estate | 2023 |
| DC15 Ltd | Real estate | 2025 |
| DCA Components Limited | Wholesale & retail | 2002 |
| DCB Music Limited | Wholesale & retail | 2012 |
| Dcme Solutions Limited | Information & communication | 2024 |
| Dcplus Ltd | Transport & logistics | 2014 |
| Dcube Technology Ltd | Professional & scientific | 2018 |
| DD Bloodstock Limited | Arts & recreation | 2025 |
| De-Kay Hygiene Solutions Limited | Wholesale & retail | 2002 |
| Deacon Direct Property Consultants Limited | Real estate | 2008 |
| Dead Good Tattoo Club Ltd | Other services | 2021 |
| Deakin Davenset Rectifiers Limited | Manufacturing | 2003 |
| Deans Rental Ltd | Administrative & support | 2025 |
| Deat for Heat Limited | Information & communication | 2026 |
| Deavdip Limited | Water & waste | 2017 |
| Debann Limited | Information & communication | 2015 |
| Debbie's Day Care Ltd | Health & social care | 2011 |
| Debco HR Ltd | Administrative & support | 2018 |
| Debi's Rudra Raaga Ltd | Arts & recreation | 2026 |
| Decebal Trans Ltd | Transport & logistics | 2014 |
| Decomplexed Limited | Professional & scientific | 2025 |
| Decoo Greg Ltd | Construction | 2024 |
| Decor Carpets & Flooring Ltd | Wholesale & retail | 2024 |
| DEE Management Services Ltd | Real estate | 2022 |
| Deecon Ltd | Professional & scientific | 2025 |