| F.Clearance Limited | Administrative & support | 2014 |
| F.D.Designs Limited | Other services | 2016 |
| F.J.J. Healthcare Limited | Health & social care | 1999 |
| F355 Limited | Wholesale & retail | 2012 |
| F8EMPIRE Ltd | Manufacturing | 2026 |
| FA Financial Services Ltd | Financial services | 2023 |
| FA HR Consulting Limited | Administrative & support | 2023 |
| Faat Enterprise Limited | Construction | 2020 |
| FAB & Glam Ltd | Wholesale & retail | 2021 |
| Fabbroclean Ltd | Administrative & support | 2024 |
| Fabiano Ventures Ltd | Professional & scientific | 2021 |
| Fabkids Limited | Health & social care | 2015 |
| Fabric World Interiors Limited | Administrative & support | 1970 |
| Fabrice Mayona Ltd | Professional & scientific | 2021 |
| Fabrilight Limited | Wholesale & retail | 2025 |
| Fabulous Homecare Ltd | Health & social care | 2019 |
| FABWORLD15 Limited | Wholesale & retail | 2023 |
| FAC 213 Limited | Professional & scientific | 2019 |
| Face & Body Studio Limited | Other services | 2019 |
| Faceflavour Ltd | Hospitality | 2024 |
| Facilitec Properties Limited | Construction | 2004 |
| Facilitime Ltd | Information & communication | 2022 |
| FAD Limited | Public administration | 2025 |
| Faded Hair and Beauty Ltd | Other services | 2026 |
| Faded Skin Ltd | Other services | 2020 |
| FAF Shipping Services Ltd | Transport & logistics | 2024 |
| Fafos Electrical Ltd | Construction | 2019 |
| Faga Trading Ltd | Transport & logistics | 2019 |
| Faii Real Estates Ltd | Real estate | 2023 |
| Fair & Square Enterprises Ltd | Other services | 2003 |
| Fair Consultants Limited | Professional & scientific | 2019 |
| Fair Oak House Management Company Limited | Households | 2006 |
| Fair Price Home Decor Croydon Ltd | Wholesale & retail | 2022 |
| Fair Trade 23 Limited | Construction | 2026 |
| Fairchildes Academy Community Trust | Education | 2014 |
| Faircross Court Management Company (Thatcham) Limited | Real estate | 2012 |
| Faircut Barbers Limited | Other services | 2001 |
| Fairfield Academy UK Limited | Education | 2012 |
| Fairfield Capital Limited | Wholesale & retail | 2010 |
| Fairfield Homes Management Limited | Construction | 2026 |
| Fairfield Milford Ltd | Wholesale & retail | 2019 |
| Fairlawns (Wombourne) Management Company Limited | Extraterritorial | 2013 |
| Fairmile House (Teddington) RTM Company Limited | Households | 2016 |
| Fairmount Holdings Limited | Real estate | 2025 |
| Fairmount Real Estate Company Limited | Construction | 1944 |
| Fairview House (Management) Limited | Households | 1964 |
| Fairways Warren Ltd | Financial services | 2024 |
| Fairy Cleaning and Handyman Services Ltd | Administrative & support | 2014 |
| Faith and Beyond | Arts & recreation | 2017 |
| Faith Book Group Ltd | Information & communication | 2021 |
| Faith Cleaning Services Ltd | Administrative & support | 2026 |
| Faith Health Care Agency Ltd | Health & social care | 2017 |
| Faith United Ltd | Extraterritorial | 2013 |
| Faith Unity | Other services | 2019 |
| Faithful Endurer Limited | Health & social care | 2018 |
| Fakhar E Haider Ltd | Wholesale & retail | 2025 |
| Falana & Sons Ltd | Real estate | 2023 |
| Falchion Group Ltd | Hospitality | 2016 |
| Falco UX Ltd | Information & communication | 2023 |
| Falcon Building Services Ltd | Construction | 2018 |
| Falcon Electronics Ltd | Administrative & support | 2017 |
| Falcon Secure Services Ltd | Wholesale & retail | 2017 |
| Falcon Transport and Logistics Limited | Transport & logistics | 2020 |
| Falcon View Properties Ltd | Real estate | 2024 |
| Falconers (Thamesmead) Management Company Limited | Households | 1985 |
| Famestore Limited | Real estate | 2003 |
| Familiar Faces Records Ltd | Information & communication | 2022 |
| Family Choice Surrey Ltd | Wholesale & retail | 2026 |
| Family of Abraham Ltd | Other services | 2024 |
| Familyfun Party Hire Ltd | Administrative & support | 2025 |
| Famous Peri Peri Limited | Hospitality | 2020 |
| Famous Video Limited | Information & communication | 2017 |
| Fanatick Ltd | Wholesale & retail | 2020 |
| Fanbo Ltd | Wholesale & retail | 2023 |
| Fancyfacehealth Ltd | Health & social care | 2019 |
| Fanecliff Limited | Construction | 1971 |
| Fang FU Limited | Construction | 2021 |
| Fanozi Limited | Wholesale & retail | 2025 |
| Fantasy Production Music Limited | Arts & recreation | 2009 |
| FAR OUT Food Limited | Hospitality | 2017 |
| Faraday Consulting Limited | Administrative & support | 2020 |
| Fare House Limited | Financial services | 2024 |
| Farfalle Enterprises Limited | Manufacturing | 2019 |
| Farlap Capital Limited | Financial services | 2015 |
| Farley and Associates Limited | Professional & scientific | 2005 |
| Farm Drive Management Limited | Households | 1967 |
| Farm Taste Ltd | Manufacturing | 2021 |
| Farmako Limited | Wholesale & retail | 2018 |
| Farmview Portfolio Limited | Real estate | 2026 |
| Farnaby Road (Bromley) Flat Maintenance Limited | Households | 1970 |
| Farnek Services Ltd | Administrative & support | 2019 |
| Fars Fashions Ltd | Construction | 2021 |
| Farthing Court Property Management Company Limited | Households | 2008 |
| Fashion Roller Limited | Professional & scientific | 2014 |
| FASHION1 Limited | Wholesale & retail | 2019 |
| Fashionable Apparel Ltd | Wholesale & retail | 2018 |
| Fast Electrical Services Ltd | Construction | 2011 |
| Fast EPC London Ltd | Professional & scientific | 2020 |
| Fast Track Evictions Limited | Professional & scientific | 2015 |
| Fast TV Limited | Information & communication | 2023 |