| Fmtm Construction Ltd | Construction | 2025 |
| Fmtm Living Ltd | Real estate | 2025 |
| FMZ Associates Ltd | Wholesale & retail | 2021 |
| FNF Wholesaler Ltd | Wholesale & retail | 2024 |
| Fngroup Limited | Wholesale & retail | 2025 |
| FNM Collection Ltd | Wholesale & retail | 2019 |
| Fobiz Limited | Professional & scientific | 2003 |
| Focus Cleaning Team Limited | Administrative & support | 2021 |
| Focus Investments Ltd | Real estate | 2026 |
| Focus Link Ltd | Professional & scientific | 2009 |
| Focus Mind Ltd | Health & social care | 2015 |
| Focus Residential Limited | Real estate | 1996 |
| Focusing on YOU Limited | Other services | 2009 |
| Focux Limited | Manufacturing | 2018 |
| Folakemii Ltd | Transport & logistics | 2026 |
| Folkon UK Limited | Manufacturing | 2018 |
| FON Healthcare Limited | Health & social care | 2024 |
| Fonebucks Limited | Information & communication | 2019 |
| FONECARE4U.COM Ltd | Wholesale & retail | 2016 |
| Fones Kits Limited | Wholesale & retail | 2026 |
| Fonseka Properties Limited | Real estate | 2024 |
| Fontan Limited | Real estate | 2023 |
| Fontari Ltd | Wholesale & retail | 2021 |
| Food Angles Limited | Wholesale & retail | 2006 |
| Food Republic Retail Ltd | Wholesale & retail | 2020 |
| Food to Go Oldham Ltd | Hospitality | 2022 |
| Foodaza Ltd | Hospitality | 2021 |
| Foodie Indians Ltd | Hospitality | 2023 |
| Foods Arcade Limited | Other services | 2022 |
| Foodsters Limited | Hospitality | 2025 |
| Foody BEE Ltd | Wholesale & retail | 2021 |
| Foot MED Limited | Health & social care | 2022 |
| Footprints Foster Care Ltd | Other services | 2011 |
| FOR English Press Nine Ltd | Education | 2019 |
| FOR Moza Ltd | Wholesale & retail | 2025 |
| Forbidden Temptation Ltd | Wholesale & retail | 2024 |
| Foremost Homes Limited | Construction | 2025 |
| Forever Dreaming Ltd | Extraterritorial | 2021 |
| Forever Exquisite Ltd | Other services | 2024 |
| Forever Homecare Limited | Health & social care | 2012 |
| Forex Money Transfer Limited | Financial services | 2015 |
| Formac Groundworks and Construction Limited | Administrative & support | 2004 |
| Formal Construction Ltd | Construction | 2024 |
| Forman Finance Ltd | Financial services | 2023 |
| Formedee UK Ltd | Financial services | 2026 |
| Formend Limited | Administrative & support | 1998 |
| Formidable Labs UK Limited | Information & communication | 2016 |
| FORMULAE5 Ltd | Other services | 2025 |
| Formulascents Limited | Wholesale & retail | 2021 |
| Fornax-Tech Limited | Information & communication | 2020 |
| Fort & Co Limited | Professional & scientific | 2009 |
| Fortescue Jones Ltd | Wholesale & retail | 2012 |
| Fortex Global Ltd | Construction | 2024 |
| Fortis Rock Properties Ltd | Real estate | 2020 |
| Fortress Guard Solution Ltd | Administrative & support | 2025 |
| Fortress Healthcare & Staffing Limited | Health & social care | 2025 |
| Fortunate Design & Build Limited | Construction | 2022 |
| Fortune Properties PVT Ltd | Real estate | 2023 |
| Fortune Real Estate Ltd | Construction | 2024 |
| Fortune UK Limited | Manufacturing | 2001 |
| Fortune Wholesales Limited | Wholesale & retail | 2018 |
| Fortunecompany Ltd | Real estate | 2025 |
| Forty Four Concept Ltd | Construction | 2026 |
| Forty Goals Limited | Agriculture & fishing | 2015 |
| Fortzauk Limited | Health & social care | 2024 |
| Forum 32 Limited | Wholesale & retail | 2024 |
| Forward Skills Limited | Education | 2024 |
| Forzacabs Ltd | Transport & logistics | 2024 |
| Fossa Care Ltd | Administrative & support | 2025 |
| Fotapro London Ltd | Construction | 2018 |
| Fotheringay Gardens (Slough) Management Company Limited | Real estate | 1982 |
| Foto Magic Limited | Manufacturing | 2022 |
| Foto Management Limited | Education | 2018 |
| Foundry Court Block C Slough RTM Company Ltd | Households | 2026 |
| Foundry Court Block D Slough RTM Company Ltd | Households | 2026 |
| Foundry Court Block E Slough RTM Company Ltd | Households | 2026 |
| Foundry Court Slough RTM Company Ltd | Households | 2025 |
| Foundry Gym Birmingham Ltd | Arts & recreation | 2022 |
| Foundry Gym Halesowen Ltd | Arts & recreation | 2023 |
| Foundry Gym Mansfield East Mids Ltd | Arts & recreation | 2026 |
| Foundry Gym Sutton Ltd | Arts & recreation | 2026 |
| Foundry Gym Worcester Ltd | Arts & recreation | 2025 |
| Four A'S Healthcare Limited | Health & social care | 2020 |
| Four Business Software Limited | Information & communication | 2018 |
| Four Business Solutions Limited | Information & communication | 2022 |
| Four Hillside Assets Ltd | Hospitality | 2023 |
| Four Seasons (PVT) Ltd | Real estate | 2022 |
| Four Seasons Baby Limited | Wholesale & retail | 2026 |
| Four Seasons Contractors Limited | Construction | 2014 |
| Fourfold Creations Ltd | Wholesale & retail | 2026 |
| Fourteen Holiday Limited | Administrative & support | 2021 |
| Fourteen Stars Private Limited | Manufacturing | 2015 |
| Fourway Building Solutions Limited | Construction | 2013 |
| FOW Limited | Hospitality | 2025 |
| Foxbridge Care (Brentwood) Limited | Health & social care | 2026 |
| Foxpress Bookstore UK Ltd | Wholesale & retail | 2025 |
| Foxpress Media UK Limited | Professional & scientific | 2025 |
| Fprh Ltd | Real estate | 2024 |
| FQA UK Limited | Information & communication | 2016 |
| FR Bookkeeping Limited | Professional & scientific | 2024 |