| DIA Technology Ltd | Other services | 2023 |
| Diablo Distribution Limited | Wholesale & retail | 2019 |
| Diagnosync Limited | Information & communication | 2023 |
| Dial a Donut Ltd | Hospitality | 2025 |
| Dial for a Drink Limited | Hospitality | 2021 |
| Dial House Place (Rainford) Management Company Limited | Households | 2024 |
| Dial Properties Limited | Administrative & support | 1994 |
| Dial-A-Rod Limited | Professional & scientific | 1992 |
| Dialhub Limited | Administrative & support | 2020 |
| Diamond Art Studio UK Ltd | Wholesale & retail | 2020 |
| Diamond Bars Derby Limited | Hospitality | 2024 |
| Diamond City 2026 Ltd | Hospitality | 2026 |
| Diamond Cleaning (Belfast) Limited | Administrative & support | 2022 |
| Diamond Gate Properties Ltd | Real estate | 2025 |
| Diamond House Corner Limited | Real estate | 2020 |
| Diamond Kang Properties Limited | Real estate | 2019 |
| Diamond Oven & Carpet Cleaning Limited | Administrative & support | 2015 |
| Diamond Performance Racing Ltd | Manufacturing | 2024 |
| Diamonds City 2024 Limited | Hospitality | 2024 |
| Diana Duggan Associates (UK) Ltd | Administrative & support | 2014 |
| Diana Duggan Associates Holdings Ltd | Financial services | 2025 |
| DID Secure Ltd | Information & communication | 2025 |
| Didimos Properties Ltd | Real estate | 2026 |
| Diesel and Dagger Ltd | Wholesale & retail | 2025 |
| Digbeth Square Management Company Limited | Households | 2020 |
| Digi Cycle Solutions Limited | Water & waste | 2026 |
| Digilynx Limited | Information & communication | 2021 |
| Digital Aerospace Design Limited | Professional & scientific | 2015 |
| Digital Division Ltd | Professional & scientific | 2015 |
| Digital Done Group Limited | Information & communication | 2020 |
| Digital Education Marketing Limited | Information & communication | 2011 |
| Digital Enforcement Concepts Limited | Professional & scientific | 2017 |
| Digital Health Hub Ltd | Information & communication | 2026 |
| Digital Icon Agency Limited | Administrative & support | 2017 |
| Digital Ignition Ltd | Information & communication | 2017 |
| Digital Marketingsuk Ltd | Manufacturing | 2025 |
| Digital Product Solutions Limited | Professional & scientific | 2015 |
| Digital Solutions Management Limited | Professional & scientific | 2017 |
| Digizee Ltd | Information & communication | 2026 |
| Dignity Independent Living C.I.C. | Real estate | 2024 |
| Digs Contractors Ltd | Professional & scientific | 2019 |
| DIL 786 Investments Ltd | Real estate | 2025 |
| Dilhe Estates Ltd | Real estate | 2016 |
| Dilivio Services Ltd | Transport & logistics | 2025 |
| Dillyz Cars Ltd | Transport & logistics | 2024 |
| Dima Investments Ltd | Health & social care | 2018 |
| Dimant Properties Limited | Real estate | 2006 |
| Dime Technologies Ltd | Information & communication | 2025 |
| Dimm HK Ltd | Wholesale & retail | 2022 |
| DIN Gastro Ltd | Administrative & support | 2016 |
| DIN Services Limited | Health & social care | 2004 |
| DINER66 Limited | Hospitality | 2018 |
| Dinky Candles Ltd | Wholesale & retail | 2020 |
| Dinmadee Limited | Wholesale & retail | 2016 |
| Dinsdale Construction Ltd | Construction | 2020 |
| DIO Genes Financial Limited | Extraterritorial | 2011 |
| Direct 4X4 Limited | Extraterritorial | 2003 |
| Direct 4X4 Manufacturing Limited | Manufacturing | 1997 |
| Direct Building & Plumbing Supplies Limited | Wholesale & retail | 1998 |
| Direct Clean Ltd | Administrative & support | 2019 |
| Direct Finance Solutions Limited | Financial services | 2007 |
| Direct Roofing Limited | Construction | 2019 |
| Direct Shop 4 Stores Limited | Wholesale & retail | 2013 |
| Direct Stairlifts Ltd | Wholesale & retail | 2007 |
| Direct to Site Contractor Services Limited | Extraterritorial | 2008 |
| Dirty Little Treasures Ltd | Wholesale & retail | 2024 |
| Dirty Rock Campers Limited | Wholesale & retail | 2022 |
| Dirty Rock Property Ltd | Real estate | 2025 |
| Dis-Dimi Ltd | Administrative & support | 2019 |
| Disaan Limited | Health & social care | 2025 |
| Disability Direct | Health & social care | 1999 |
| Discovery Properties Limited | Construction | 1993 |
| Diseworth Heritage Trust | Arts & recreation | 2005 |
| Dishley Forestry Services Ltd | Agriculture & fishing | 2025 |
| Distinctive Acquisitions Limited | Administrative & support | 2024 |
| Distove Caribbean Cuisine Catering Ltd | Hospitality | 2025 |
| Divemaster Scuba Chesterfield Limited | Professional & scientific | 2008 |
| Divina Casa Living Ltd | Real estate | 2020 |
| Divine (Midlands) Limited | Hospitality | 2011 |
| Divine Dynamics Limited | Public administration | 2025 |
| Divine Skin Ltd | Other services | 2018 |
| Diviniti Holdings Limited | Financial services | 2021 |
| Diviniti Ltd. | Real estate | 2005 |
| Diwa Management Ltd | Professional & scientific | 2026 |
| Diya Beauty Ltd | Wholesale & retail | 2023 |
| Diyar Limited | Real estate | 2024 |
| DJ Building Ltd | Construction | 2023 |
| Dj'Healthwise Ltd | Wholesale & retail | 2025 |
| Djbedford Consultancy Ltd | Professional & scientific | 2022 |
| DJC Civil Engineering Limited | Construction | 2012 |
| DJD Technology Ltd | Information & communication | 2024 |
| DJE Project Management Limited | Construction | 2009 |
| DJF Composites Limited | Manufacturing | 2018 |
| DJH Bolton Limited | Professional & scientific | 2006 |
| DJH Derby Limited | Professional & scientific | 2002 |
| DJH Tech Partners Limited | Information & communication | 2017 |
| DJL Agriculture Limited | Wholesale & retail | 2016 |
| DJL Amenity Ltd | Agriculture & fishing | 2025 |
| Djla Holdings Limited | Financial services | 2014 |
| DJM Consult Limited | Public administration | 2019 |