| Expertax Limited | Professional & scientific | 2024 |
| Expo Cash & Carry Ltd | Wholesale & retail | 2023 |
| Express Demolition Ltd | Construction | 2025 |
| Express Developments Limited | Real estate | 2002 |
| Express Distillers Limited | Wholesale & retail | 2023 |
| Express Grill and Pizza Ltd | Hospitality | 2015 |
| Express Parcel Delivery Limited | Transport & logistics | 2017 |
| Express R&M Estates Ltd | Real estate | 2022 |
| Express UK Tyres Ltd | Manufacturing | 2026 |
| Expressmotion Limited | Manufacturing | 1997 |
| Extranonce Limited | Information & communication | 2020 |
| Extrapolate Ltd | Information & communication | 2024 |
| Extrastake Property Management Limited | Extraterritorial | 1986 |
| Extreme Investments Ltd | Real estate | 2015 |
| Extremer Ltd | Wholesale & retail | 2025 |
| Eyeconic Management Ltd | Professional & scientific | 2022 |
| Eyribalt Ltd | Administrative & support | 2017 |
| Eyzey Ltd | Hospitality | 2024 |
| EZ Property Rentals Ltd | Real estate | 2024 |
| Ezidrops Ltd | Manufacturing | 2019 |
| Ezion Ltd | Information & communication | 2025 |
| Ezovion Group Ltd | Wholesale & retail | 2015 |
| Ezutoram Limited | Households | 2018 |
| F & J Developments Ltd | Wholesale & retail | 2022 |
| F Andrus Ltd | Construction | 2019 |
| F C J Precision Grinding Limited | Manufacturing | 2014 |
| F G and G Services Limited | Construction | 2023 |
| F Pintea Ltd | Administrative & support | 2015 |
| F R Kisule Limited | Administrative & support | 2014 |
| F S R Holdings Limited | Financial services | 2016 |
| F Wilma Ltd | Health & social care | 2016 |
| F&B Europe Limited | Wholesale & retail | 2023 |
| F&D Global Limited | Wholesale & retail | 2023 |
| F&S Interiors Ltd | Construction | 2023 |
| F&Z Enterprise Ltd | Other services | 2012 |
| F. H. Lambert Limited | Professional & scientific | 2021 |
| F7D Ltd | Construction | 2014 |
| FA Corporate Limited | Wholesale & retail | 2014 |
| Fabric Fomo Ltd | Wholesale & retail | 2025 |
| Fabsy Ltd | Hospitality | 2025 |
| Facade Consulting Limited | Professional & scientific | 2022 |
| Facades Specialists Ltd | Construction | 2014 |
| Face 2 Face Aesthetic Clinic Ltd | Professional & scientific | 2020 |
| Facebyck Ltd | Other services | 2024 |
| Faceo FM UK Ltd | Administrative & support | 1975 |
| Facorp Limited | Information & communication | 2013 |
| Factor SIX Films Ltd | Information & communication | 2015 |
| Fade Masters Barber Limited | Wholesale & retail | 2015 |
| Fadoua Farji Ltd | Financial services | 2023 |
| FAI Transport Ltd | Transport & logistics | 2024 |
| Faib Solutions Ltd | Professional & scientific | 2023 |
| Faibs Limited | Wholesale & retail | 2022 |
| Fair Care Professional Ltd | Health & social care | 2011 |
| Fair Private Capital Partners Limited | Financial services | 2020 |
| Fair Process Limited | Administrative & support | 2004 |
| Fair View Accountants Ltd | Professional & scientific | 2010 |
| Fairfields Chaseside Residents Limited | Real estate | 1995 |
| Fairland Contractors Ltd | Construction | 1990 |
| Fairs Residential Limited | Real estate | 2021 |
| Fairshot Court (Management) Limited | Households | 1998 |
| Fairstone Partners Ltd | Professional & scientific | 2023 |
| Fairtree Solutions Ltd | Administrative & support | 2016 |
| Fairview Accountax Limited | Professional & scientific | 2014 |
| Fairview Insights Ltd | Administrative & support | 2018 |
| Fairway Marine Services Limited | Transport & logistics | 2000 |
| Faith Tabernacle | Other services | 2003 |
| Fakhruddin Properties (UK) Limited | Financial services | 2020 |
| Fakri Ltd | Construction | 2022 |
| Falcon Autotech Ltd | Wholesale & retail | 2019 |
| Falcon Furniture Ltd | Wholesale & retail | 2025 |
| Falcon Heating Solution Ltd | Construction | 2016 |
| Falcon Hire Services Ltd | Administrative & support | 2026 |
| Falcon Real Estate Investments Ltd | Real estate | 2024 |
| Falcon Roofing & Construction Ltd | Construction | 2025 |
| Falcon Seven Media Ltd | Professional & scientific | 2016 |
| Falcon Smart IT Limited | Information & communication | 2019 |
| Falcon Structural Repairs Limited | Construction | 1986 |
| Falcon Travel (Watford) Ltd | Administrative & support | 2017 |
| Falkenberg Corporation LP | | 2014 |
| Fallsbrook Road Ltd | Construction | 2024 |
| Fallsbrook Road Management Company Limited | Households | 2024 |
| FAM Inspired Stays Ltd | Real estate | 2026 |
| FAM Realty Ltd | Real estate | 2023 |
| FAM Stays Ltd | Real estate | 2025 |
| Fame of London Limited | Wholesale & retail | 2023 |
| Family Guys Roofing and Maintenance Ltd | Construction | 2025 |
| Fancy Apps Limited | Information & communication | 2019 |
| Fansy Limited | Wholesale & retail | 2015 |
| Fantasia Advertising Limited | Professional & scientific | 1993 |
| FAR Impex Limited | Health & social care | 2016 |
| FAR Property Group Ltd | Real estate | 2024 |
| FAR Songs Ltd | Information & communication | 2014 |
| Farben Designs Ltd | Professional & scientific | 2025 |
| Farhan Tinwala Limited | Professional & scientific | 2022 |
| Farheen Abdool Majid Psychology Consultancy Ltd | Health & social care | 2025 |
| Farm House Pizza Ltd | Administrative & support | 2005 |
| Farm Pizzaria Ltd | Professional & scientific | 2019 |
| Farm to Mart Ltd | Wholesale & retail | 2024 |
| Farm Way Management Company Limited | Households | 2008 |
| Farooqui Homes Ltd | Real estate | 2022 |