| Flow Control Consulting Ltd | Transport & logistics | 2025 |
| Flow Control Holding Limited | Financial services | 2025 |
| Flow Studio. Doncaster Ltd | Arts & recreation | 2024 |
| Flow-Tech Installations Ltd | Construction | 2024 |
| Flower Hill Ltd. | Wholesale & retail | 2007 |
| Flower in Hand Limited | Professional & scientific | 2018 |
| Flowmole Limited | Construction | 2024 |
| Flowpex Solutions Limited | Wholesale & retail | 2026 |
| Flowscope Healthcare Ltd | Professional & scientific | 2026 |
| Flowtek HDD UK Ltd | Construction | 2012 |
| Flowww.Org Associates Ltd | Financial services | 2026 |
| Flox Group Ltd | Wholesale & retail | 2019 |
| FLP Ltd | Wholesale & retail | 2013 |
| FLP Worldwide LLP | | 2013 |
| FLS Industrial Services Ltd | Extraterritorial | 2019 |
| Fluffy Stuff Ltd. | Professional & scientific | 2018 |
| Fluid Power Solutions Ltd | Other services | 2003 |
| Fluxentra Platforms Ltd | Extraterritorial | 2026 |
| Fluxvision Ltd | Information & communication | 2023 |
| Flydoncaster Limited | Transport & logistics | 2024 |
| Flying Futures C.I.C | Arts & recreation | 2009 |
| Fmcg Interim & Consultancy Services Ltd | Professional & scientific | 2016 |
| Fmcg Retail & Sales Consultancy Limited | Administrative & support | 2013 |
| Fmcgexec Limited | Administrative & support | 2002 |
| Fmdi Trans Ltd | Transport & logistics | 2025 |
| FME Facility Management & Engineering Limited | Extraterritorial | 2024 |
| FMF Connect Ltd | Financial services | 2026 |
| FMH Property Services Limited | Households | 2025 |
| FMM Productions Limited | Professional & scientific | 2019 |
| Fmpr Limited | Professional & scientific | 2014 |
| FN Family Advantage Limited | Transport & logistics | 2019 |
| FNA C.I.C. | Other services | 2026 |
| FND Beauty Ltd | Other services | 2019 |
| FND TM Ltd | Construction | 2018 |
| FND Together WE Rise CIC | Administrative & support | 2025 |
| Focstrans Ltd | Transport & logistics | 2018 |
| Fodder & Froth Limited | Hospitality | 2019 |
| Foga System UK Ltd | Manufacturing | 2014 |
| Folat UK Ltd | Wholesale & retail | 2021 |
| Fold Music Limited | Information & communication | 2014 |
| Folde Stays Ltd | Hospitality | 2025 |
| Folk Matter Ltd | Health & social care | 2025 |
| Follet Ltd | Wholesale & retail | 2025 |
| Follitech Ltd | Other services | 2020 |
| Follow Janey Ltd | Professional & scientific | 2020 |
| Folly Nook Developments Limited | Real estate | 2008 |
| Fond Farewell Direct Cremations Ltd | Other services | 2025 |
| Fondation Ecole Art ET Metiers Camp Ltd | Wholesale & retail | 2026 |
| Fontanellamy Limited | Other services | 2025 |
| Food 2 EAT Limited | Hospitality | 2026 |
| Food 49 Limited | Hospitality | 2026 |
| Food and Beverage Northern Ltd | Health & social care | 2024 |
| Food Integrity & Systems Support Ltd | Professional & scientific | 2018 |
| Food Massala Ltd | Hospitality | 2018 |
| Food Plus Hexthorpe Ltd | Wholesale & retail | 2019 |
| Food Target Ltd | Hospitality | 2020 |
| Foodline Supplies Ltd | Wholesale & retail | 2026 |
| Foot Forward Property Investments Ltd | Real estate | 2015 |
| Footastic Limited | Wholesale & retail | 2025 |
| Football Family Foundation CIC | Education | 2019 |
| Football Prodigy Coaching Academy Ltd | Professional & scientific | 2024 |
| Football Prodigy Community CIC | Education | 2025 |
| FOOTBALL4HEALTH Ltd | Arts & recreation | 2025 |
| Footprint Builders Ltd | Construction | 2011 |
| FOR WE Care Healthcare Services Ltd | Health & social care | 2019 |
| Force 10 Doors Ltd | Wholesale & retail | 2023 |
| Force 10 Homes Ltd | Construction | 2019 |
| Force 10 Recruitment Ltd | Administrative & support | 2007 |
| Force Electrical Ltd | Construction | 2012 |
| Force Solutions Limited | Construction | 2007 |
| Ford BID Solutions Ltd | Professional & scientific | 2023 |
| Forefront IT Services Limited | Information & communication | 2021 |
| Forerunner Fitness Limited | Extraterritorial | 2024 |
| Foresight Compliance Limited | Professional & scientific | 2014 |
| Foresight Design Limited | Information & communication | 2024 |
| Foresta Limited | Professional & scientific | 2023 |
| Forestersessentials Ltd | Wholesale & retail | 2025 |
| Forever Blue Sky Limited | Real estate | 2017 |
| Forever Green Installations Limited | Construction | 2025 |
| Forever Smooth Laser Ltd | Other services | 2023 |
| Forever United Ltd | Wholesale & retail | 2025 |
| Foreverlawn Limited | Wholesale & retail | 2012 |
| Forge & Feel AI Studio Ltd | Information & communication | 2025 |
| Forged Growth Ltd | Wholesale & retail | 2026 |
| Forged in Nature Forest School CIC | Education | 2025 |
| Forgepeak Engineering Ltd | Extraterritorial | 2026 |
| Forgetrade UK Limited | Professional & scientific | 2025 |
| Fork Truck Transport Limited | Transport & logistics | 2021 |
| Forma Athleisure Ltd | Wholesale & retail | 2026 |
| Formation Agents Limited | Extraterritorial | 2006 |
| Formation Awareness and Community Engagement Society (Faces) AID UK CIC | Information & communication | 2024 |
| Formed Creative Limited | Professional & scientific | 2013 |
| Formosa Ltd | Professional & scientific | 2015 |
| Fort ST. Elmo Holdings Limited | Financial services | 2022 |
| Fortalis Services Ltd | Professional & scientific | 2025 |
| Forte Civil Ltd | Construction | 2022 |
| Forte Construction Ltd | Construction | 2022 |
| Forte Consultancy Limited | Financial services | 2019 |
| Forte Education Group Limited | Extraterritorial | 2022 |
| Fortema Group Limited | Real estate | 2025 |