| DDB SET Support Ltd | Construction | 2025 |
| Design Domain Limited | Arts & recreation | 2007 |
| Devere Software Limited | Information & communication | 2003 |
| Dextec Building Services and Facilities Management Limited | Administrative & support | 2011 |
| Diggers and Dreamers Ltd | Extraterritorial | 2025 |
| Digi Beat Ltd | Wholesale & retail | 2015 |
| DMF Fitness Studios Ltd | Arts & recreation | 2022 |
| Dockers Scaffolding Ltd | Construction | 2017 |
| Dogs Best Friend Ltd | Other services | 2026 |
| Dooncaher Ltd | Construction | 2013 |
| DQ Travel Advisors Limited | Administrative & support | 2005 |
| Drab Leisure Ltd | Arts & recreation | 2023 |
| Dreadnought Reach Limited | Administrative & support | 2004 |
| Dreamy Wellbeing Ltd | Wholesale & retail | 2024 |
| Drivedream Limited | Households | 1995 |
| Dutchlands Management Limited | Households | 2005 |
| Eaglex Ltd | Other services | 2020 |
| Earth Air Fire Water Ltd | Professional & scientific | 2012 |
| Earth Tide Consulting Ltd | Professional & scientific | 2025 |
| Eazi-Fit.Com Ltd | Wholesale & retail | 2017 |
| Echomark Ltd | Professional & scientific | 2024 |
| EGO Verse Ltd | Wholesale & retail | 2024 |
| Eidem Limited | Information & communication | 2021 |
| Electric Property Limited | Real estate | 2020 |
| Elephant Planners Limited | Professional & scientific | 1997 |
| Eleven Loves Limited | Wholesale & retail | 2017 |
| Elliotts Home Improvements Limited | Construction | 2017 |
| Ellwood Court (Watford) Management Company Limited | Households | 1979 |
| Elmhurst Management Limited | Households | 1988 |
| Elmtree Court (Great Missenden) Limited | Real estate | 1968 |
| Elmtree Green Residents Association Limited | Households | 1966 |
| Emblem Properties Limited | Real estate | 2006 |
| Embleton Professional Partners Ltd | Professional & scientific | 2026 |
| Emergent Studio Ltd | Information & communication | 2021 |
| Emerson Court Management Company Limited | Households | 1982 |
| Emma J Shipley Ltd | Administrative & support | 2013 |
| Empowered Canine Ltd | Other services | 2026 |
| Enchant Ltd | Professional & scientific | 2018 |
| Endosol Ltd | Education | 2022 |
| Enerfox Ltd | Information & communication | 2019 |
| Eskdale Lodge (Amersham) Management Company Limited | Households | 1975 |
| Eskdale Lodge Associates RTE Limited | Households | 2010 |
| Espever Limited | Information & communication | 2021 |
| Estela Holdings Limited | Other services | 2021 |
| Eurohouse Design Ltd | Construction | 2007 |
| Everdene Ltd | Construction | 2025 |
| Evevideo Ltd | Information & communication | 2021 |
| Exclusive Escapes Ltd | Hospitality | 2021 |
| Expert Media Pro Ltd | Information & communication | 2025 |
| Eyebright Homes Ltd | Real estate | 2026 |
| Fair Acres Builders Limited | Construction | 2015 |
| Fairfield Place (Uxbridge) Management Co. Limited | Real estate | 1975 |
| Fairpay Limited | Professional & scientific | 1996 |
| Falcon Barber Ltd | Other services | 2023 |
| FAN FAN Pizza Ltd | Hospitality | 2019 |
| Farins Family Limited | Real estate | 2017 |
| Farmford Limited | Households | 1982 |
| Fast Lane Paint Repairs Ltd | Manufacturing | 2003 |
| Faster NOT Easier Ltd | Professional & scientific | 2017 |
| Fastsearch Limited | Professional & scientific | 2004 |
| Fayence Management Consulting Limited | Professional & scientific | 2014 |
| Fell Court Management Limited | Households | 1985 |
| Fellsy.Tv Ltd | Information & communication | 2017 |
| Fenix Systems Ltd | Manufacturing | 2024 |
| Field & Stable Ltd | Manufacturing | 2014 |
| Filene’S Limited | Wholesale & retail | 2025 |
| Financial Services Advisory & Consultancy Ltd | Professional & scientific | 2025 |
| Fintech Plus Ltd | Information & communication | 2015 |
| Firecrest Books Limited | Information & communication | 1995 |
| Firecrest Media Ltd | Information & communication | 2020 |
| Firecrest Publishing Limited | Administrative & support | 2006 |
| Firle Properties Limited | Real estate | 2000 |
| Five on a Bike Limited | Information & communication | 2014 |
| Fleina Limited | Information & communication | 2021 |
| Flickerbook Features Limited | Information & communication | 2017 |
| Flintlock Homes Ltd | Real estate | 2013 |
| FNB Limited | Health & social care | 2001 |
| Fordingham Limited | Professional & scientific | 2022 |
| Formosa Systems Ltd | Information & communication | 2017 |
| FOX and Beau Ltd | Wholesale & retail | 2020 |
| FOX Curated Ltd | Administrative & support | 2025 |
| Freim Limited | Information & communication | 2021 |
| Frith Hill Farm Limited | Agriculture & fishing | 2026 |
| FTP Solutions Ltd | Information & communication | 2023 |
| Gambol Foods Limited | Manufacturing | 2021 |
| Gates Farm Limited | Agriculture & fishing | 1973 |
| GB Training & Consulting Limited | Professional & scientific | 2006 |
| Gemma Chase Marketing Ltd | Professional & scientific | 2023 |
| Georgian Lodge Residents Association (Pinner) Limited | Households | 2017 |
| Geosky Services Limited | Construction | 2006 |
| Gexilabs Ltd | Administrative & support | 2023 |
| Ghanshyam Housing Ltd | Real estate | 2017 |
| Gilly Hafner Design Ltd | Administrative & support | 2018 |
| Glebe Ickenham Management Limited | Households | 2008 |
| Glebe Meadow Management Co Ltd | Households | 2022 |
| Glen View Investments Limited | Real estate | 2015 |
| Gmsa Accounting Ltd | Professional & scientific | 2025 |
| Gmsa Air Charters Ltd | Administrative & support | 2024 |
| Gmsa Properties Ltd | Real estate | 2022 |
| Goodun Limited | Information & communication | 2018 |