| Darkrock Ltd | Construction | 2025 |
| Darkside Security and Events Ltd | Administrative & support | 2025 |
| Darkstrata Ltd | Information & communication | 2025 |
| Darkvision Guild Ltd | Information & communication | 2013 |
| Darkwoods Exports Ltd | Information & communication | 2025 |
| Darley Mill Development Limited | Construction | 2025 |
| Darley Property Ltd | Real estate | 2018 |
| Darleybale Limited | Wholesale & retail | 2008 |
| Darli Developments Ltd | Construction | 2019 |
| Darlington Homes Limited | Real estate | 1992 |
| Darn IT Limited | Wholesale & retail | 1986 |
| Darnall Refreshments (Yorkshire) Ltd | Wholesale & retail | 2015 |
| Darnay Electrical & Automation Ltd | Manufacturing | 2025 |
| Darnel Electrical Limited | Construction | 2007 |
| Darnton Group Limited | Professional & scientific | 2007 |
| DARNTONB3 Limited | Professional & scientific | 2008 |
| Darren Burdell Photography Limited | Professional & scientific | 2008 |
| Darren Stringer Limited | Construction | 2015 |
| Darreto Ltd | Wholesale & retail | 2024 |
| Dart Cubicles LLP | | 2012 |
| Dart Engineers Ltd | Construction | 2023 |
| Dart Leasing & Finance (MSN 63154/63156) Limited | Extraterritorial | 2017 |
| Dart Leasing & Finance Limited | Administrative & support | 2017 |
| Dart Products Europe Ltd. | Manufacturing | 1970 |
| Dartingdaz Transport Ltd | Transport & logistics | 2017 |
| Dartry Financial Limited | Professional & scientific | 2020 |
| Daru TV & Film Limited | Hospitality | 2010 |
| DARUCHINI24 Ltd | Hospitality | 2024 |
| Darul Yasin Ltd | Education | 2018 |
| Darvish Limited | Hospitality | 2017 |
| Darwen Stores Ltd | Wholesale & retail | 2022 |
| Darwin Global Capital | Other services | 2018 |
| Darwin Office Ltd | Wholesale & retail | 2020 |
| Daryl Watson Tattoo Ltd | Other services | 2025 |
| Darz Holdings Limited | Financial services | 2025 |
| DAS Engineering Group Limited | Financial services | 2023 |
| DAS Engineering Holdings Limited | Professional & scientific | 2012 |
| DAS Engineering Services Group Limited | Financial services | 2023 |
| DAS Financials Ltd | Professional & scientific | 2023 |
| Dasaf Services Ltd | Health & social care | 2015 |
| Dash Recoveries Ltd | Manufacturing | 2025 |
| Dashmesh Locums Limited | Health & social care | 2013 |
| Dashwood Ventures Ltd | Hospitality | 2023 |
| Dashy Ventures Ltd | Wholesale & retail | 2019 |
| Dasilvasoft Ltd | Information & communication | 2019 |
| Dasm Properties Limited | Real estate | 2019 |
| Dasole Engineering Ltd | Professional & scientific | 2026 |
| Dass & Dass Ltd | Wholesale & retail | 2019 |
| Data Arch Limited | Information & communication | 2024 |
| Data Aware Limited | Information & communication | 2014 |
| Data Centre Ltd | Information & communication | 2003 |
| Data City Innovations Ltd | Information & communication | 2017 |
| Data Crave Ltd | Information & communication | 2023 |
| Data Driven Health Ltd | Information & communication | 2013 |
| Data HIT Ltd | Information & communication | 2025 |
| Data Integral Ltd | Information & communication | 2017 |
| Data IS Boring Ltd | Information & communication | 2026 |
| Data Junki Ltd | Information & communication | 2017 |
| Data OD Ltd | Information & communication | 2016 |
| Data Protection People Limited | Information & communication | 2015 |
| Data Q Solutions Ltd | Information & communication | 1997 |
| Data Research & Information Bureau Limited | | 2003 |
| Data Scholars Ltd | Information & communication | 2023 |
| Data Security Consulting Limited | Professional & scientific | 2010 |
| Data Venture Solutions Ltd | Information & communication | 2018 |
| Data Visionary Limited | Professional & scientific | 2018 |
| Data-Systems (Yorkshire) Ltd | Other services | 2005 |
| Data-Trax Ltd | Information & communication | 2011 |
| Databank Limited | Professional & scientific | 2003 |
| Databoss Consulting Ltd | Professional & scientific | 2013 |
| Datadiligence Limited | Professional & scientific | 2014 |
| Datadomain Ltd | Information & communication | 2026 |
| Datafin Ltd | Information & communication | 2024 |
| Dataflow Network Installations Ltd | Construction | 2003 |
| Dataflow Networking Installations Limited | Construction | 2012 |
| Dataloch Ltd | Information & communication | 2017 |
| Datasmith Ltd | Professional & scientific | 2024 |
| Datastratex Limited | Information & communication | 2024 |
| Datasys Integration Limited | Extraterritorial | 2009 |
| Dataworx Solutions Limited | Information & communication | 2025 |
| Datim Solution Limited | Other services | 2022 |
| Dating Online Limited | Other services | 2021 |
| Dats Developments Ltd | Administrative & support | 2024 |
| Dattra Consulting Ltd | Information & communication | 2026 |
| Datum Group Marketing Ltd | Administrative & support | 2022 |
| Dauntless Procurement Ltd | Professional & scientific | 2022 |
| DAV Family Ltd | Transport & logistics | 2022 |
| Daval Consultants Limited | Professional & scientific | 2010 |
| Davao Property Group Limited | Real estate | 2023 |
| Davdanis Limited | Health & social care | 2022 |
| Dave Bant Ltd | Real estate | 2024 |
| Dave Place Ltd. | Wholesale & retail | 2013 |
| Dave Rayner Cycle Sport Limited | Wholesale & retail | 2007 |
| Davenport Crafted Creations Ltd | Manufacturing | 2008 |
| Davenport Development Homes Limited | Real estate | 2019 |
| Davern Holdings Limited | Other services | 1953 |
| Daveswork Ltd | Information & communication | 2020 |
| Davey Oleary Ltd | Real estate | 2025 |
| David & Kane Strategy Ltd | Information & communication | 2025 |
| David & Mathias Limited | Administrative & support | 2026 |