| Falcon Media Limited | Administrative & support | 2003 |
| Fall Into Flowers Ltd | Wholesale & retail | 2017 |
| Fallon Outcome Delivery Ltd | Information & communication | 2026 |
| Family Enrichment Services CIC | Other services | 2023 |
| Family Law Barristers Ltd | Professional & scientific | 2017 |
| Family Martial Arts Franchising Limited | Arts & recreation | 2012 |
| Family Martial Arts Warrington LLP | | 2024 |
| Family Martial Arts Wirral LLP | | 2024 |
| Family Support Care Ltd | Health & social care | 2017 |
| Famished Femme Productions Ltd | Information & communication | 2025 |
| Famished Monsters Ltd | Manufacturing | 2026 |
| Famous PK Ltd | Information & communication | 2024 |
| Famous PR Ltd | Wholesale & retail | 2020 |
| Fanciable Ltd | Professional & scientific | 2025 |
| Fandangos Productions Ltd | Arts & recreation | 2018 |
| Fanform Limited | Real estate | 1998 |
| Fantasia Supermarket Ltd | Wholesale & retail | 2017 |
| Fantastic Rooms Ltd | Households | 2023 |
| Fantasy Chicken Fast Food Ltd | Hospitality | 2025 |
| Faraday Development Limited | Construction | 2004 |
| Faringdon Precision Engineering Ltd | Manufacturing | 2005 |
| Faringdon's Hand Car Wash Ltd | Other services | 2017 |
| Farm Yard Circus Ltd | Arts & recreation | 2020 |
| Farmceutica Group Ltd | Wholesale & retail | 2021 |
| Farmery Property Group Ltd | Real estate | 2019 |
| Farmgene Limited | Agriculture & fishing | 2004 |
| Farnborough Aerospace Centre Management Limited | Real estate | 1991 |
| Farnworth Marine Ltd | Professional & scientific | 2023 |
| Farringdon Derivatives Limited | Professional & scientific | 2010 |
| Farrs Catering Group Limited | Hospitality | 2015 |
| Farrs Freehouse's Ltd | Hospitality | 2020 |
| Farsight Wills Ltd. | Professional & scientific | 2011 |
| Fasie LUX Limited | Wholesale & retail | 2025 |
| Fast Car Valeting Ltd | Administrative & support | 2011 |
| Fast Courier for YOU Ltd | Transport & logistics | 2021 |
| Fast Delivery MAR Ltd | Transport & logistics | 2025 |
| Fast Piston Ltd | Wholesale & retail | 2023 |
| Fast Piston Performance & Paint Ltd | Wholesale & retail | 2025 |
| Fast Plumbing & Heating Ltd | Construction | 2022 |
| Fast Spedition Limited | Wholesale & retail | 2016 |
| Fast Track Staffing Solutions Ltd | Administrative & support | 2026 |
| Fastlink Data Cables Limited | Manufacturing | 1993 |
| FAT Bustards Motors Limited | Wholesale & retail | 2025 |
| Fatima Lettings Ltd | Real estate | 2025 |
| Fatima Properties Ltd | Real estate | 2026 |
| Fausto Properties Ltd | Real estate | 2025 |
| Favajo Limited | Health & social care | 2013 |
| Favour Eight Ltd | Other services | 2023 |
| Favour Internet Cafe & Unisex Ltd | Wholesale & retail | 2025 |
| Fayrehouse Ltd | Information & communication | 2013 |
| Fays Flowers Group PLC | Professional & scientific | 2016 |
| Fayth Ifil Ltd | Arts & recreation | 2024 |
| Fazz Services Limited | Professional & scientific | 2019 |
| Fazzs Bar Ltd | Hospitality | 2024 |
| FB Catering XL Ltd | Hospitality | 2023 |
| FC GOA Ltd | Hospitality | 2023 |
| FD Electrical Services Ltd | Construction | 2020 |
| FDB Group Ltd | Construction | 2026 |
| FDC Technologies Ltd | Information & communication | 2013 |
| FDE Solar UK Limited | Wholesale & retail | 2021 |
| FDM Consulting Ltd | Information & communication | 2021 |
| Fdsgb Ltd | Extraterritorial | 2024 |
| FE Builds Ltd | Construction | 2021 |
| Feathertouch Caring Limited | Hospitality | 2013 |
| Feathertouch Property Management Limited | Real estate | 2021 |
| FEB BAS Limited | Health & social care | 2024 |
| Fedai Technology Limited | Information & communication | 2014 |
| Federation for Informatics Professionals in Health and Social Care Community Interest Company | Health & social care | 2017 |
| Feeney Heating Services Ltd | Manufacturing | 2025 |
| Felbridge Homes Limited | Real estate | 1997 |
| Felicitas Creative Marketing Solutions Ltd | Professional & scientific | 2025 |
| Femmaz Ltd | Health & social care | 2017 |
| FEN Tiger Productions Ltd | Information & communication | 2021 |
| Fengad Ltd | Health & social care | 2023 |
| Fennels Gate (Management) Company Limited | Households | 1999 |
| Fentonblue Recruitment Limited | Administrative & support | 2023 |
| Fermac Limited | Transport & logistics | 2020 |
| Fernandes Properties Ltd | Real estate | 2024 |
| Ferndale Aerials Ltd | Information & communication | 2018 |
| Ferndale Food and Wine Ltd | Wholesale & retail | 2015 |
| Fernedit Ltd | Wholesale & retail | 2026 |
| Ferns Driving School Ltd | Administrative & support | 2026 |
| FEST4YOU Ltd | Administrative & support | 2020 |
| Festival on the Farm Ltd | Arts & recreation | 2024 |
| Festivalamp Ltd | Information & communication | 2025 |
| Festivales Limited | Administrative & support | 1999 |
| Festive Colours Ltd | Arts & recreation | 2019 |
| Fetch Fulfilment Ltd | Transport & logistics | 2022 |
| Fethan Ltd | Health & social care | 2023 |
| Ffrr Paignton Ltd | Hospitality | 2025 |
| FH2 Development Ltd | Real estate | 2021 |
| Fhsm Logistics Ltd | Transport & logistics | 2026 |
| FI Capital Investments Ltd | Financial services | 2021 |
| Fibre Planning Solutions Ltd | Professional & scientific | 2020 |
| Fibreactive Limited | Manufacturing | 1997 |
| Fibrecom Data Networks Limited | Information & communication | 2001 |
| FIC Logistics Ltd | Transport & logistics | 2024 |
| Fidelity Healthcare Grove Hill Ltd | Health & social care | 2019 |
| Fidenti Group Ltd | Financial services | 2020 |
| Fidenti Wealth Protection Ltd | Financial services | 2016 |