| Deer and Conservation Ltd | Professional & scientific | 2024 |
| Deeson Limited | Financial services | 2023 |
| Deetv Limited | Information & communication | 2011 |
| Delaquest Limited | Hospitality | 1993 |
| Delem Beauty Ltd | Other services | 2019 |
| Deli Costa Ltd | Wholesale & retail | 2022 |
| Delisle Properties Limited | Real estate | 2023 |
| Delm Properties Ltd | Real estate | 2021 |
| DES Does Ideas Ltd | Professional & scientific | 2025 |
| Design Build Repeat Ltd | Construction | 2020 |
| Design House Studio Ltd | Manufacturing | 2015 |
| Design Manufacture Distribute Limited | Financial services | 2020 |
| Design My Kitchen Limited | Extraterritorial | 2024 |
| DFT Instruments (UK) Limited | Administrative & support | 2010 |
| Dial Squared Ltd | Financial services | 2026 |
| Digital Design Team Ltd | Professional & scientific | 2016 |
| Digital Egret Ltd | Information & communication | 2024 |
| Digital Highstreet Group Limited | Wholesale & retail | 2022 |
| Digital Nomad Holdings Limited | Real estate | 2018 |
| Dionball Limited | Hospitality | 1998 |
| Directit UK Limited | Administrative & support | 2025 |
| Distant Sun Consulting Limited | Professional & scientific | 2014 |
| Distinctive Property Services Ltd | Construction | 2020 |
| Dixon Consulting & Operations Ltd | Professional & scientific | 2025 |
| DJF Planning Limited | Professional & scientific | 2015 |
| DK Fitness Limited | Education | 2014 |
| DK Property Maintenance Limited | Construction | 2017 |
| Dodo Labs Ltd | Wholesale & retail | 2026 |
| Domus Events Limited | Administrative & support | 2004 |
| Doodle & Patch Commercial Limited | Real estate | 2022 |
| Doodle & Remedy Limited | Health & social care | 2025 |
| Doodledum Limited | Other services | 2017 |
| Dowty Consultants Limited | Manufacturing | 2021 |
| DPE Partnership Group Ltd | Wholesale & retail | 2021 |
| Drabwell Wholesale Limited | Wholesale & retail | 2009 |
| Dragons Berkhamsted Netball Club Limited | Education | 2025 |
| Draig Recruitment Ltd | Administrative & support | 2023 |
| Drincx Ltd | Professional & scientific | 2022 |
| Drum Check Limited | Administrative & support | 2014 |
| DTG Leisure Limited | Extraterritorial | 2022 |
| Dune Property Ltd | Real estate | 2019 |
| Dupont Productions Limited | Information & communication | 2005 |
| Durand-Vibert Properties Ltd | Real estate | 2023 |
| Durham Student Living Limited | Real estate | 2022 |
| Dusi Limited | Professional & scientific | 2011 |
| Dutytown Limited | Administrative & support | 2006 |
| Dynamic Badminton Ltd | Education | 2022 |
| Dynamic Evolution Limited | Real estate | 2023 |
| E J Waterhouse Investments Ltd | Real estate | 2020 |
| E Kibble Ltd | Real estate | 2025 |
| E&C Property Group Limited | Real estate | 2020 |
| E-Magnets UK Limited | Wholesale & retail | 2008 |
| E.M.L Management Ltd | Professional & scientific | 2017 |
| Eagle Bema Properties Ltd | Real estate | 2022 |
| Eagle EYE (GB) Ltd. | Transport & logistics | 2011 |
| Earthly Music Limited | Arts & recreation | 1974 |
| Earthworm Ltd | Real estate | 2026 |
| East Central One Limited | Information & communication | 1998 |
| Ebury Public Affairs Ltd | Professional & scientific | 2019 |
| EC Invest Limited | Real estate | 2022 |
| Echostand Limited | Hospitality | 1999 |
| Eclipse Twenty SIX Limited | Real estate | 2026 |
| Eclipse Well Services Ltd | Mining & quarrying | 2026 |
| Ecom Brand Alliance Limited | Wholesale & retail | 2020 |
| Ecompass Social Media Limited | Professional & scientific | 2019 |
| ECR Group-Uk Limited | Administrative & support | 2015 |
| ECR Payments Ltd | Information & communication | 2019 |
| Ecsj Ltd | Health & social care | 2020 |
| Eden Rose Agencies Limited | Professional & scientific | 2013 |
| Edoré Limited | Manufacturing | 2025 |
| Egerton Rothesay | Education | 2001 |
| Egerton-Rothesay School Limited | Education | 1988 |
| Egglesfield Close Management Company Limited | Households | 2002 |
| EH REC2REC Ltd | Administrative & support | 2025 |
| Eidetics Limited | Information & communication | 1985 |
| Eildon Actuarial Ltd | Financial services | 2025 |
| Eisenstadt Properties Ltd | Real estate | 2016 |
| Ejen Consulting Limited | Professional & scientific | 2024 |
| EJM Developments Ltd | Real estate | 2020 |
| EL James Limited | Health & social care | 2004 |
| Eleanor Close Management Co Berkhamsted Ltd | Households | 2022 |
| Electronic Media Audits Limited | Professional & scientific | 1996 |
| Element Home Services Ltd | Construction | 2022 |
| Elemental Accounting Ltd | Professional & scientific | 2013 |
| Eleos Ltd | Administrative & support | 2023 |
| Elephant Direct Ltd | Administrative & support | 2007 |
| ELEV8 London Limited | Professional & scientific | 2018 |
| Elevate Effects Ltd | Professional & scientific | 2025 |
| Elevate Lashes Ltd | Other services | 2023 |
| Elfinman Limited | Extraterritorial | 2002 |
| Elite Nutrients Limited | Wholesale & retail | 2019 |
| Elite Sportsturf Ltd | Wholesale & retail | 2017 |
| Elite Transformations Ltd | Arts & recreation | 2020 |
| Elizabeth Tagg Design Ltd | Professional & scientific | 2020 |
| Ellel LAB Ltd | Professional & scientific | 2026 |
| Ellen Teague Limited | Other services | 2014 |
| Elliott Gardiner Investments Limited | Real estate | 2009 |
| ELS Events Ltd | Administrative & support | 2018 |
| ELW Services Limited | Administrative & support | 2025 |
| Elysian Berkhamsted Operating Company Limited | Real estate | 2021 |