| Falmouth Construction Limited | Construction | 2020 |
| Falsgrave Funeral Service Ltd | Other services | 2023 |
| FAM Premier Ltd | Wholesale & retail | 2018 |
| Families Relief Recycle UK Ltd | Wholesale & retail | 2021 |
| Family Foods Ltd | Hospitality | 2022 |
| Family FUN Time Limited | Arts & recreation | 2016 |
| Family Thai Kitchen Ltd | Hospitality | 2022 |
| Family Tree Records Limited | Arts & recreation | 2014 |
| Family Voice Sheffield C.I.C. | Hospitality | 2018 |
| Family Wills and Estate Planning Limited | Professional & scientific | 2013 |
| Famlingo Ltd | Education | 2018 |
| Famm IT Consultancy Ltd | Information & communication | 2023 |
| Famous Tattoo Studio Ltd | Other services | 2017 |
| FAN Cave Group Ltd | Wholesale & retail | 2019 |
| Fancy Fries Franchise Ltd | Hospitality | 2023 |
| Fancy Nails Ltd | Other services | 2024 |
| Fandango Data Solutions Limited | Information & communication | 2020 |
| Fangorn Consultancy Ltd | Information & communication | 2026 |
| Fanhuasheng Ltd | Wholesale & retail | 2025 |
| Fans Chance Limited | Other services | 2025 |
| Fanshi Crystal Limited | Wholesale & retail | 2025 |
| Fansidy Limited | Health & social care | 2013 |
| Fantastic Ecological Design Landscape Co. Ltd | Administrative & support | 2016 |
| FAO Recruitment Limited | Extraterritorial | 2014 |
| FAR Beyond Driven Limited | Arts & recreation | 2015 |
| FAR North Film Ltd | Information & communication | 2017 |
| FAR OUT Campers Ltd | Wholesale & retail | 2025 |
| FAR Whitely Investments Group Limited | Real estate | 2026 |
| Faraday Scientific Limited | Manufacturing | 2010 |
| Farafina Trade Ltd | Wholesale & retail | 2023 |
| Faresco Holdings Limited | Professional & scientific | 2019 |
| Faresco Limited | Wholesale & retail | 1988 |
| Faretext Limited | Information & communication | 2013 |
| Farkas Associates Limited | Health & social care | 2009 |
| Farkas Limited | Wholesale & retail | 2025 |
| Farley PUB & Restaurant Services Limited | Professional & scientific | 2016 |
| Farm to Feed Ltd | Wholesale & retail | 2026 |
| Farm View Management (Ulley) Ltd | Households | 2025 |
| Farmer Norton (UK) Limited | Manufacturing | 2021 |
| Farmer Will Media Limited | Professional & scientific | 2023 |
| Farmers Feast Limited | Hospitality | 2003 |
| Farmerys Florist Limited | Professional & scientific | 2019 |
| Farmomi Limited | Wholesale & retail | 2026 |
| Farmweigh Ltd | Manufacturing | 2025 |
| Farnell Car & Commercial Limited | Wholesale & retail | 2015 |
| Farpost Creative Limited | Professional & scientific | 2012 |
| Farr International Ltd | Professional & scientific | 2019 |
| Farragher Consultancy Ltd | Professional & scientific | 2018 |
| Farrand Property Limited | Real estate | 2022 |
| Farro Ltd | Hospitality | 2024 |
| Farspan Limited | Construction | 1986 |
| Farwater Properties Ltd. | Real estate | 2017 |
| Farzanah Nasser Nutrition Limited | Administrative & support | 2023 |
| Fasadgruppen UK Bidco Limited | Construction | 2024 |
| Fasadgruppen UK Limited | Financial services | 2024 |
| Fashion Influx Limited | Professional & scientific | 2018 |
| Fashion Marketing and Content Creation Limited | Wholesale & retail | 2025 |
| Fashion/Sewing Ltd | Arts & recreation | 2025 |
| Fast & Fresh Cleaning Limited | Administrative & support | 2025 |
| Fast & Loose Pubs Ltd | Hospitality | 2020 |
| Fast Deliveries Pwllheli Ltd | Transport & logistics | 2018 |
| Fast Find Hire Ltd | Administrative & support | 2025 |
| Fast Fit Auto Ltd | Wholesale & retail | 2022 |
| Fast FIX Locksmith Ltd | Administrative & support | 2026 |
| Fast Lane Delivery Service Limited | Hospitality | 2025 |
| Fast Maids Ltd | Administrative & support | 2025 |
| Fast Saps Limited | Construction | 2019 |
| Fast Sea Trade Ltd | Wholesale & retail | 2023 |
| Fast Track Construction Services Ltd | Construction | 2018 |
| Fast Track Financial Limited | Financial services | 2015 |
| Fast Track Freight Limited | Transport & logistics | 2020 |
| Fast Track to Slow Living Ltd | Professional & scientific | 2023 |
| Fast-Western Limited | Information & communication | 1971 |
| Faster Deliveries Pwllheli Ltd | Transport & logistics | 2021 |
| Fastrack Brokers Limited | Administrative & support | 2014 |
| Fasttrack Rail Interface Services Limited | Construction | 2025 |
| Fasttrack Screening Services Ltd | Administrative & support | 2023 |
| FAT Cat Entertainment Limited | Wholesale & retail | 2023 |
| FAT Possum Records Limited | Information & communication | 2014 |
| FAT Stans Dinnington Limited | Wholesale & retail | 2014 |
| FAT White Family Limited | Information & communication | 2016 |
| Fatern Ltd | Construction | 2016 |
| Fates and Fury Tattoo Ltd | Arts & recreation | 2019 |
| Fathom Interactive Limited | Information & communication | 2005 |
| Fatima Consultancy Ltd | Information & communication | 2025 |
| Faturk Ltd | Professional & scientific | 2025 |
| Fauxkin Limited | Real estate | 1967 |
| Favela Football CIC | Arts & recreation | 2024 |
| Favela Sports Group Ltd | Wholesale & retail | 2024 |
| Favell Smith & Lawson Limited | Professional & scientific | 2014 |
| Favourite Cleancare Ltd | Administrative & support | 2019 |
| Fawley Road Management Company Limited | Households | 1976 |
| Fawmond Galaxy Ltd | Wholesale & retail | 2024 |
| Fawnmore Limited | Professional & scientific | 2022 |
| Faxon Render Systems Ltd | Construction | 2014 |
| Fazaty Europe Limited | Financial services | 2024 |
| Fazely Properties Ltd | Real estate | 2023 |
| FB Customs Ltd | Wholesale & retail | 2024 |
| FB Fire Technologies Ltd | Manufacturing | 2014 |
| FB Repair Solutions Ltd | Construction | 2023 |