| Erik JAN Scholten Ltd | Professional & scientific | 2011 |
| Erringham Consulting Ltd | Professional & scientific | 2018 |
| Erzanmyne Ltd | Construction | 2021 |
| Essbee Consulting Ltd | Information & communication | 2026 |
| Estate Agent Services Team Ltd | Other services | 2019 |
| Ethereal Software Limited | Information & communication | 2013 |
| Eurostar International (Films & TV) Limited | Transport & logistics | 1991 |
| Eva&David Limited | Construction | 2021 |
| Evans Way (Tring) Management Limited | Households | 1997 |
| Evely Consulting Ltd | Administrative & support | 2024 |
| Everslea Associates Limited | Information & communication | 2006 |
| Evolvedspaces Investments Ltd | Real estate | 2023 |
| Evolvedspaces Ltd | Construction | 2020 |
| Evomore Limited | Financial services | 2023 |
| Ewire Limited | Information & communication | 2002 |
| Excultus Limited | Professional & scientific | 2010 |
| Exfx Ltd | Information & communication | 2025 |
| Exim Software Limited | Extraterritorial | 2004 |
| Experience Work Education C.I.C. | Education | 2024 |
| External Techs Limited | Information & communication | 2018 |
| F.S.P. Architects & Planners Limited | Professional & scientific | 1993 |
| Faciendo Consulting Ltd | Professional & scientific | 2024 |
| Farm Direct Limited | Wholesale & retail | 2014 |
| Farmer JON Property Ltd | Real estate | 2024 |
| Farr & Pursey Equine Veterinary Services Limited | Professional & scientific | 2014 |
| Farston Limited | Professional & scientific | 2024 |
| Fastworx Limited | Administrative & support | 2017 |
| Feathers & Sprinkles Limited | Arts & recreation | 2022 |
| Febosol UK Limited | Real estate | 2023 |
| Fenley Martel Ltd | Professional & scientific | 2016 |
| Feral Spirit LLP | | 2024 |
| FF Corse Limited | Wholesale & retail | 2009 |
| Ffix Consulting Ltd | Professional & scientific | 2019 |
| FFR Services Limited | Professional & scientific | 2025 |
| Fibre Options Limited | Information & communication | 1990 |
| Film Drapes Ltd | Manufacturing | 2023 |
| Finance 4 Homes Limited | Financial services | 2018 |
| Finborough Consulting Limited | Information & communication | 2019 |
| Finch & Walker Ltd | Wholesale & retail | 2025 |
| Finch Hatton Management Limited | Financial services | 2022 |
| Fineplan Consulting Ltd | Professional & scientific | 2018 |
| Fire Stop Products Limited | Wholesale & retail | 2022 |
| Firstofjune Property Limited | Real estate | 2019 |
| Fisherking 2000 Limited | Construction | 1999 |
| Fisticuf Ltd | Information & communication | 2014 |
| Fitclub Gym Group Ltd | Health & social care | 2024 |
| Fitclub Properties Ltd | Real estate | 2025 |
| Fitclub Tring Ltd | Arts & recreation | 2024 |
| FIVE1FIVE C Ltd | Information & communication | 2018 |
| FJ Building Solutions Ltd | Construction | 2025 |
| FK & L Otto Ltd | Health & social care | 2010 |
| FK Styling Ltd | Information & communication | 2025 |
| Flame Sisters Ltd | Wholesale & retail | 2023 |
| Fletcherwilson Limited | Information & communication | 2012 |
| FLO HQ Ltd | Information & communication | 2025 |
| Flourishing Potential Ltd | Professional & scientific | 2019 |
| Fluxguide Limited | Professional & scientific | 2024 |
| Flytes Hydration Ltd | Wholesale & retail | 2025 |
| FMD Projects Limited | Construction | 2014 |
| FMD Rentals Ltd | Real estate | 2020 |
| Foodie Flavours Limited | Wholesale & retail | 2009 |
| Forde Films Ltd | Information & communication | 2025 |
| Foreign Currency Partners Ltd | Administrative & support | 2020 |
| Forrester Video Ltd | Information & communication | 2018 |
| Fortis Green Digital Limited | Information & communication | 2021 |
| Fosn Limited | Professional & scientific | 2012 |
| Foundry DC Ltd | Arts & recreation | 2022 |
| Four Core Studio Ltd | Information & communication | 2024 |
| Fourth Avenue Estates Limited | Construction | 1948 |
| FOX Hegarty Ltd | Professional & scientific | 2025 |
| Frankham Project Management Ltd | Professional & scientific | 2014 |
| Franklin Frames Limited | Wholesale & retail | 2000 |
| Frankum Associates Ltd | Construction | 2020 |
| Free Rein Pilates Ltd | Education | 2025 |
| Frequency Wizards Ltd | Arts & recreation | 2021 |
| Frontier Innovation Ltd | Professional & scientific | 2024 |
| FRS Air Conditioning Ltd | Energy | 2024 |
| FSP Business Services Limited | Real estate | 1999 |
| FSP Properties Limited | Real estate | 2016 |
| Full Circle Technologies Limited | Information & communication | 2019 |
| Full-Time Cover Limited | Financial services | 2014 |
| Fullelove Smith Limited | Professional & scientific | 2018 |
| Fullerton Investment Company Limited | Real estate | 2016 |
| FUN 4 MUM Ltd | Wholesale & retail | 2011 |
| Functional IT Solutions Ltd | Information & communication | 2019 |
| Funky Doodle Ltd | Professional & scientific | 2024 |
| Futuresonic Ltd. | Information & communication | 2014 |
| G Grace & SON Hotels Ltd | Hospitality | 2023 |
| G Grace & SON Ltd | Wholesale & retail | 2020 |
| G H Electrical (Tring) Limited | Construction | 2015 |
| G Hicks Construction Limited | Construction | 2003 |
| G P Quoreenton (Ductwork) Limited | Energy | 2008 |
| G S Reynolds & Sons Transport Ltd | Transport & logistics | 2013 |
| G&B Product Services Limited | Wholesale & retail | 2018 |
| G&O Consulting Limited | Professional & scientific | 2026 |
| G.E.C. Anderson Limited | Manufacturing | 1962 |
| G.O.A.T. Yard Limited | Hospitality | 2024 |
| G1 Governance Limited | Real estate | 2025 |
| Gamnel Mews (Tring) Management Company Limited | Administrative & support | 2001 |
| Garden Know HOW Ltd | Administrative & support | 2015 |