| Farvis Hardwick Ltd | Hospitality | 2011 |
| Faryal Enterprise Limited | Wholesale & retail | 2025 |
| FAS Contractors Ltd | Construction | 2026 |
| Fascination Street Records Ltd | Administrative & support | 2022 |
| Fascination Surgico Limited | Wholesale & retail | 2025 |
| Fascloud Ltd | Information & communication | 2025 |
| Fashion Agencies (Bristol) Limited | Real estate | 1963 |
| Fashion to Go Ltd | Wholesale & retail | 2026 |
| Fashion Wise Clothing Ltd | Wholesale & retail | 2024 |
| Fasoc Ltd | Administrative & support | 2016 |
| Fast & Furious Recoveries Ltd | Transport & logistics | 2025 |
| Fast and Fair Electrical Services Ltd | Construction | 2024 |
| Fast Business Solutions Limited | Other services | 2019 |
| Fast Choice 360 Ltd | Wholesale & retail | 2023 |
| Fast Eats Delivery Group Ltd | Financial services | 2025 |
| Fast Garage Ltd | Wholesale & retail | 2020 |
| Fast Labs IT Limited | Information & communication | 2025 |
| Fast Lettings & Property Management Ltd | Real estate | 2024 |
| Fast NG Limited | Transport & logistics | 2026 |
| Fast PHV Ltd | Transport & logistics | 2025 |
| Fast Standard Organisation Ltd | Other services | 2011 |
| Fastblade Limited | Real estate | 1999 |
| Fastfix Home Services Ltd | Real estate | 2023 |
| Fastly Services Ltd | Wholesale & retail | 2025 |
| Fastnet Marine Insurance Services Limited | Administrative & support | 1992 |
| Fastock Limited | Professional & scientific | 2002 |
| Fastpass Corp UK Group Limited | Professional & scientific | 1998 |
| Fastpass Corp UK Limited | Information & communication | 1998 |
| Fastshop Ltd | Extraterritorial | 2014 |
| Fasttrack Cambridge Limited | Real estate | 2009 |
| FAT Bean Coffee Company Limited | Manufacturing | 2023 |
| FAT Cat Travel Ltd | Administrative & support | 2026 |
| FAT Dads Kitchen Ltd | Hospitality | 2019 |
| FAT Dracula Records Ltd | Wholesale & retail | 2023 |
| FAT Giraffe Gifts Ltd | Wholesale & retail | 2020 |
| FAT Red Bird Ltd. | Information & communication | 2016 |
| FAT Rice Ltd | Hospitality | 2022 |
| FAT Toni's (Stroud) Limited | Hospitality | 2014 |
| Fate Therapeutics Ltd | Administrative & support | 2010 |
| Fatiger Ltd | Wholesale & retail | 2025 |
| Fatima ALI Ltd | Hospitality | 2011 |
| Fatima Shirazi Limited | Professional & scientific | 2025 |
| Fatsumo Limited | Wholesale & retail | 2011 |
| Fattso Ltd | Hospitality | 2020 |
| Fatty LOU Ltd | Wholesale & retail | 2018 |
| Fatwhale Limited | Transport & logistics | 2024 |
| Fatz Limited | Wholesale & retail | 2004 |
| Faulds Creativeworks Ltd | Professional & scientific | 2018 |
| Faulkland Construction Limited | Construction | 2003 |
| Faulkner Restaurants Limited | Hospitality | 2007 |
| Fauri Logistics Limited | Transport & logistics | 2019 |
| Favo Ltd | Information & communication | 2018 |
| Favor Ventures Ltd | Construction | 2023 |
| Favour Care Services Ltd | Health & social care | 2019 |
| Favourite Fried Chicken Ltd | Hospitality | 2022 |
| Favourite Motors Ltd | Wholesale & retail | 2020 |
| Fawad Hameed Limited | Health & social care | 2024 |
| Fawn and Blue Limited | Manufacturing | 2017 |
| Fawn Interiors Ltd | Professional & scientific | 2015 |
| Faye Close Limited | Households | 2022 |
| Faye Doherty Limited | Professional & scientific | 2023 |
| Fayke Ltd | Extraterritorial | 2022 |
| Fayre Oaks Limited | Wholesale & retail | 1991 |
| Fayton Limited | Financial services | 2000 |
| Fazakerley Prison Services Limited | Construction | 1994 |
| Faze Property Solutions Limited | Real estate | 2025 |
| FB Apparel Ltd | Wholesale & retail | 2024 |
| FB Carpentry Ltd | Construction | 2019 |
| FB Events Ltd | Arts & recreation | 2024 |
| FB JAK Ltd | Health & social care | 2023 |
| FB Promotions Ltd | Information & communication | 2024 |
| FB Trans Limited | Administrative & support | 2000 |
| FBA Ellis Ltd | Wholesale & retail | 2026 |
| FBC Icon Management Ltd | Administrative & support | 2025 |
| FBG11 Transport Ltd | Transport & logistics | 2025 |
| FBK Ltd | Wholesale & retail | 2016 |
| Fbmp Limited | Administrative & support | 2023 |
| Fbnyyz Ltd | Information & communication | 2024 |
| FBS Entertainment Limited | Arts & recreation | 2024 |
| FC Construct Ltd | Construction | 2025 |
| FCF Recoveries Limited | Financial services | 2025 |
| FCG Buying Limited | Agriculture & fishing | 2013 |
| FCG Labour Ltd | Agriculture & fishing | 2020 |
| Fcls Group Limited | Professional & scientific | 1996 |
| Fcls Holdings Limited | Extraterritorial | 2003 |
| Fcls RM 108 Limited | Other services | 2025 |
| Fcls RM 109 Limited | Other services | 2025 |
| Fcls RM 110 Limited | Other services | 2025 |
| Fcls RM 115 Limited | Other services | 2025 |
| Fcls RM 116 Limited | Other services | 2025 |
| Fcls RM 128 Limited | Other services | 2026 |
| Fcls RM 129 Limited | Other services | 2026 |
| Fcls RM 22 Limited | Other services | 2021 |
| FCP Coffee Ltd | Hospitality | 2023 |
| FCS Trading Limited | Construction | 2014 |
| FCT Real Estate Ltd | Real estate | 2025 |
| Fczo Ltd | Construction | 2024 |
| FD Commercial & Bridging Ltd | Financial services | 2018 |
| FD Licensing Limited | Information & communication | 2000 |
| FD Plus Limited | Professional & scientific | 2025 |