| DNA Brands Limited | Wholesale & retail | 2013 |
| Dnate Limited | Administrative & support | 2004 |
| Dnba Ltd | Education | 2025 |
| DND Brothers Transport Ltd | Transport & logistics | 2023 |
| DNK Trans Ltd | Transport & logistics | 2023 |
| DNP Entertainments Ltd | Administrative & support | 2024 |
| DNP Solutions Limited | Construction | 2022 |
| Dnsj Limited | Financial services | 2023 |
| DO Bees Cleaning Ltd | Administrative & support | 2025 |
| Dobbs and Bond Associates Ltd | Construction | 2016 |
| Dobix Healthcare Ltd | Health & social care | 2018 |
| Doble Motorcycles Limited | Wholesale & retail | 2017 |
| Dobles Motorcycles Ltd. | Wholesale & retail | 2017 |
| Dobrescu Kris Limited | Transport & logistics | 2018 |
| Dobrogeanu Florian Ltd | Transport & logistics | 2020 |
| Dobrolux Ltd | Real estate | 2025 |
| Dobson and James Law Ltd | Professional & scientific | 2020 |
| Docaway Coaching Limited | Education | 2020 |
| Dock 2 Shop Limited | Wholesale & retail | 2023 |
| Docsolution Limited | Information & communication | 2006 |
| Doctor Electric Ltd | Construction | 2019 |
| Docwhizz Limited | Information & communication | 2024 |
| Doddington Development Projects Ltd Ltd | Construction | 2025 |
| Doddington Nurseries Ltd | Wholesale & retail | 2023 |
| Dodford Properties Limited | Manufacturing | 1985 |
| DOE Contracts Limited | Construction | 2024 |
| Dog Days Dinners Limited | Other services | 2018 |
| Dog Days Inn Limited | Other services | 2013 |
| Dogaru Trans Ltd | Education | 2018 |
| Doggery Limited | Extraterritorial | 2023 |
| Doggett Electrical Services Limited | Construction | 2019 |
| Doghead Creative Ltd | Information & communication | 2021 |
| Doghead Productions Ltd | Arts & recreation | 2020 |
| Dogoat Ltd | Manufacturing | 2026 |
| Dogot Brickwork Ltd | Construction | 2023 |
| Dogs in Need Agility Limited | Agriculture & fishing | 2010 |
| Dokument Legaliz Limited | Professional & scientific | 2025 |
| Dolan Express Ltd | Administrative & support | 2018 |
| Dollar Speed Ltd | Transport & logistics | 2017 |
| Dolmek Ltd | Real estate | 2022 |
| Dolphin Outsourcing Ltd | Professional & scientific | 2019 |
| DOM Trans Ltd | Transport & logistics | 2017 |
| Domary Trans Ltd | Transport & logistics | 2023 |
| Dombricks Ltd | Construction | 2021 |
| Dome From Home Limited | Hospitality | 2022 |
| Dominic INT Trans Ltd | Transport & logistics | 2022 |
| Dominic P Trans Ltd | Transport & logistics | 2018 |
| Dominik Facades Ltd | Construction | 2024 |
| Domus Estates Ltd | Real estate | 2022 |
| Domus Interiors (Morpeth) Limited | Wholesale & retail | 2015 |
| Domus Quattuor Ltd | Real estate | 2026 |
| DON Enterprises (Rushden) Limited | Construction | 2014 |
| DON Haulage Limited | Administrative & support | 2022 |
| DON Smith Blinds Limited | Manufacturing | 2004 |
| Don'T Buy, Adopt Ltd | Agriculture & fishing | 2022 |
| Donald SZE Limited | Arts & recreation | 2023 |
| Donbas Trans Ltd | Transport & logistics | 2026 |
| Donegan Properties 2025 Ltd | Real estate | 2025 |
| Doni's Construction Ltd | Construction | 2022 |
| Donna Salado Design Limited | Arts & recreation | 2024 |
| Donnys Pizza Ltd | Wholesale & retail | 2026 |
| Donwell Cleaning Company Limited | Administrative & support | 2026 |
| Doodles Stick Limited | Professional & scientific | 2016 |
| Door Spring Supplies Ltd | Manufacturing | 2008 |
| Door-To-Door-Holidays Limited | Administrative & support | 2003 |
| Doorstep Dispensaree Limited | Wholesale & retail | 2015 |
| Doorway Services Limited | Extraterritorial | 2016 |
| Doosan Bobcat UK Northampton Ltd. | Wholesale & retail | 2011 |
| DOR Consulting Limited | Financial services | 2017 |
| Dorado Beauty Ltd | Wholesale & retail | 2024 |
| Dorah Assets Ltd | Real estate | 2025 |
| Dorchester Court (Northampton) Limited | Households | 1983 |
| Dorchester Homes and Developments Ltd | Real estate | 2022 |
| Dorchester Management Consultancy Ltd | Professional & scientific | 2018 |
| Dore DOT Limited | Professional & scientific | 2025 |
| Dorelk Care Ltd | Health & social care | 2022 |
| Dorin Services Ltd | Transport & logistics | 2022 |
| Dorinmarin Limited | Transport & logistics | 2025 |
| Doris-D Limited | Health & social care | 2020 |
| Dorney Properties Limited | Real estate | 2021 |
| Dosa Chef Limited | Hospitality | 2012 |
| Dosa Xpress Ltd | Hospitality | 2025 |
| Dosh & Wickett Ltd | Wholesale & retail | 2023 |
| Dossierflow Tech Limited | Information & communication | 2025 |
| Dostavka Ltd | Transport & logistics | 2026 |
| DOT Bekins Ltd | Wholesale & retail | 2020 |
| DOT Property Invest Ltd | Wholesale & retail | 2019 |
| Dot's Finishing Limited | Wholesale & retail | 2017 |
| Dotpekins Limited | Information & communication | 2017 |
| Dotty H Properties Limited | Real estate | 2016 |
| Double Drop Limited | Financial services | 2018 |
| Double Hands Cleaning Crew Ltd | Administrative & support | 2026 |
| Double S Consulting Ltd | Professional & scientific | 2016 |
| Double S Transport Limited | Transport & logistics | 2021 |
| Double Trouble Films Limited | Other services | 2018 |
| Dove Decorating Ltd | Construction | 2015 |
| Dove Dental Care Limited | Health & social care | 2008 |
| Dove House Properties Ltd | Extraterritorial | 2010 |
| Dove Property and Developments Limited | Real estate | 2021 |
| Dovecote Gardens (NO.2) Freehold Limited | Households | 1997 |