| Font Communications Ltd | Professional & scientific | 2019 |
| Food Hygiene Services (UK) Ltd | Professional & scientific | 2011 |
| Food OPS Ltd | Hospitality | 2020 |
| Food Republic Ltd | Real estate | 2009 |
| FOOD2ENERGY Limited | Administrative & support | 2008 |
| Football Shirt Kingdom Ltd | Wholesale & retail | 2023 |
| Footballportal Limited | Wholesale & retail | 2025 |
| Footy 4 ALL CIC | Arts & recreation | 2023 |
| Forbidden Flowers by Florence Ltd | Wholesale & retail | 2025 |
| Fore Golf Studio Ltd | Arts & recreation | 2026 |
| Foree Market Limited | Wholesale & retail | 2020 |
| Forensic Psychology Partnership Ltd | Health & social care | 2023 |
| Forest Hill Design Limited | Professional & scientific | 2007 |
| Forest Hill Transport Ltd | Transport & logistics | 2016 |
| Forever Travel Ltd | Real estate | 2023 |
| Foreword Ltd | Administrative & support | 2015 |
| Forex Trading World Limited | Financial services | 2008 |
| Forge New Homes LLP | | 2019 |
| Forgetech Solutions Ltd | Wholesale & retail | 2025 |
| Form Build Limited | Wholesale & retail | 2011 |
| Formula MH Ltd | Other services | 2026 |
| Fortlands Limited | Real estate | 1990 |
| Fortress Management Services (UK) Limited | Financial services | 1999 |
| Fortress Trustee Services Limited | Financial services | 2009 |
| Fortunes Growth Ltd | Wholesale & retail | 2024 |
| Foster Your Physique Ltd | Other services | 2021 |
| Fosterwave Ltd | Information & communication | 2026 |
| Founded Ltd | Wholesale & retail | 2023 |
| Four Frog Instruments Ltd | Manufacturing | 2024 |
| Four Seasons Luxury Travel Ltd | Wholesale & retail | 2022 |
| Fournorth Property Limited | Construction | 2014 |
| Fowler & Co Limited | Financial services | 2010 |
| FOX & Co Properties Limited | Real estate | 2020 |
| FOX and Moon Limited | Wholesale & retail | 2017 |
| Foxberry (Services) Ltd | Administrative & support | 2010 |
| Foxvale Limited | Wholesale & retail | 1987 |
| FPS Commercial Ltd | Professional & scientific | 2022 |
| FR Local Properties Ltd | Real estate | 2025 |
| FR Media Ltd | Administrative & support | 2024 |
| Fr.Aesthetics Ltd | Health & social care | 2022 |
| Fragrance & Flame London Ltd | Manufacturing | 2026 |
| Framesmart Halifax Ltd | Professional & scientific | 2023 |
| Frami Consultancy Limited | Public administration | 2015 |
| Franchizza Limited | Hospitality | 2024 |
| Francis Moore (Specialist Weavers) Limited | Manufacturing | 2002 |
| Frank Langfield Holdings Limited | Financial services | 2021 |
| Frank Langfield Limited | Wholesale & retail | 1994 |
| Frank Lawson Limited | Professional & scientific | 2014 |
| Frank Nuris Group Limited | Wholesale & retail | 2026 |
| Frankies Chicken Ltd | Hospitality | 2025 |
| Franklin & LEE Ltd | Administrative & support | 2025 |
| Frankly Health Care Limited | Public administration | 2015 |
| Franklyn's (Jewellers & Goldsmiths) Limited | Wholesale & retail | 1996 |
| Frazer Hall Limited | Financial services | 2010 |
| Frazer Hall Mergers Limited | Financial services | 2011 |
| Free and Open Source Silicon Foundation C.I.C. | Other services | 2015 |
| Freightlink Europe LLP | | 2004 |
| Freightlink Ltd | Transport & logistics | 2019 |
| Freja's Centre for Reproductive Health Awareness CIC | Other services | 2023 |
| Fresco Graphic Displays Ltd | Manufacturing | 2018 |
| Fresh Air Fuels Limited | Construction | 2023 |
| Fresh and Easy Minimarket Limited | Wholesale & retail | 2017 |
| Fresh Face Clinic Ltd | Other services | 2022 |
| Fresh Grassroots Rainbow Community CIC | Other services | 2026 |
| Freshman Catering Services Ltd | Hospitality | 2024 |
| Friarsgate Studio Limited | Extraterritorial | 1983 |
| Frls Holding Limited | Financial services | 2023 |
| Frog Education Group Limited | Information & communication | 2014 |
| Frog Education Limited | Information & communication | 2000 |
| Frostbrook Fasters Ltd | Wholesale & retail | 2024 |
| Fsip Homes Ltd | Health & social care | 2022 |
| Ftma Property Ltd | Real estate | 2024 |
| FTS Platinum Ltd | Hospitality | 2026 |
| FTS Silver Ltd | Hospitality | 2024 |
| Full Exposure Ltd | Information & communication | 2024 |
| Full Healthcare Limited | Health & social care | 2022 |
| Full of Beans Ltd | Administrative & support | 2024 |
| Full of Beans Property Ltd | Real estate | 2023 |
| FUN House Productions Limited | Arts & recreation | 2001 |
| Furnaces UK Limited | Professional & scientific | 2009 |
| Furnico Living Ltd | Wholesale & retail | 2017 |
| Furnicon Limited | Construction | 2004 |
| Furqaan Mughal Delivery Ltd | Transport & logistics | 2026 |
| Furtherance Care and Nursing Limited | Health & social care | 2026 |
| Fusco & Sons Limited | Construction | 2018 |
| Fusionhr Integrations Ltd | Information & communication | 2025 |
| Future Energy Solutions Lighting Ltd | Wholesale & retail | 2025 |
| Future Home Builders Ltd | Construction | 2023 |
| Future Lens Limited | Professional & scientific | 2024 |
| Future Manufacturing Ltd | Health & social care | 2023 |
| Future Redesigned Ltd | Health & social care | 2023 |
| Future Telecom Solutions Limited | Information & communication | 2021 |
| Future Vision Holdings Ltd | Financial services | 2024 |
| Futuro International Ltd | Wholesale & retail | 2019 |
| FXH Limited | Hospitality | 2024 |
| FXK Group UK Ltd | Health & social care | 2020 |
| FZ Automotives Group Ltd | Wholesale & retail | 2024 |
| G & a Executive Properties Ltd | Real estate | 2022 |
| G & D Multitrades Limited | Construction | 2013 |
| G & F Property & Investments Limited | Real estate | 2021 |