| Falcon Flues Ltd | Construction | 2015 |
| Falkland Cricket Club Limited | Arts & recreation | 2015 |
| Falkland Cricket Club Trading Limited | Arts & recreation | 2016 |
| Falmouth Liner Freehold Limited | Households | 2022 |
| Family Breaks Ltd | Hospitality | 2022 |
| Fanscapes Ltd | Wholesale & retail | 2017 |
| FAR Pavilion Tents Ltd | Extraterritorial | 2014 |
| FARMS2EWE Limited | Agriculture & fishing | 2007 |
| Farolfort Ltd | Professional & scientific | 2023 |
| Farsighted Films Ltd | Information & communication | 2019 |
| Fastlife Limited | Real estate | 1980 |
| Fathom ME UK Limited | Administrative & support | 2017 |
| Fatman Limited | Other services | 2025 |
| Faze Five Consulting Limited | Information & communication | 2023 |
| FBC London Ltd | Administrative & support | 2012 |
| FDO Consulting Limited | Information & communication | 2016 |
| Feast-Inn Family Group Ltd | Hospitality | 2025 |
| Feather & Thistle Limited | Professional & scientific | 2018 |
| February London Ltd | Professional & scientific | 2007 |
| Felicity Wood Yoga Ltd | Education | 2019 |
| Felox Ltd | Wholesale & retail | 2025 |
| Feltham Group Limited | Professional & scientific | 2003 |
| Feltham Limited | Professional & scientific | 1999 |
| Feltham Properties Limited | Construction | 2013 |
| Fenestration Holdings Ltd | Wholesale & retail | 2022 |
| Fenix Ventures Limited | Financial services | 2021 |
| Fenton Elliott Solicitors Limited | Professional & scientific | 2018 |
| Fermented Reality Ltd | Manufacturing | 2024 |
| Fermoy Gardens Management Company Limited | Households | 2016 |
| Fernandes Food Limited | Hospitality | 2025 |
| Fernhay Limited | Manufacturing | 2019 |
| Fernhay Partners Limited | Professional & scientific | 2012 |
| Fernygrove Farm Ltd | Wholesale & retail | 2018 |
| Fero Ltd | Transport & logistics | 2015 |
| Ferreira IT Consulting Ltd | Information & communication | 2015 |
| Festival Energy Limited | Professional & scientific | 2013 |
| FF Agency Ltd | Wholesale & retail | 2019 |
| FF Consulting 2016 Ltd | Wholesale & retail | 2016 |
| Fgsj Ltd | Professional & scientific | 2026 |
| Fibonacci Media Limited | Information & communication | 2025 |
| Fiducia Opus Limited | Information & communication | 2021 |
| Field & Theory Brewing Company Ltd | Manufacturing | 2025 |
| Field Farm Stud (Wiltshire) Ltd. | Agriculture & fishing | 2018 |
| Fieldfare International Ecological Development Limited | Professional & scientific | 1996 |
| Fieldfare Trees and Gardens LLP | | 2025 |
| Fieweger Ltd | Transport & logistics | 2015 |
| Fifi & Moose Ltd | Wholesale & retail | 2007 |
| Filter Solutions Limited | Manufacturing | 2003 |
| Fine and Rare Art and Antiques Limited | Information & communication | 2010 |
| Fire and Security Supplies Limited | Wholesale & retail | 2016 |
| Firehawk Consulting Limited | Professional & scientific | 2020 |
| Firn Overseas Packaging Limited | Wholesale & retail | 1975 |
| Firnen Ltd | Real estate | 2023 |
| First Longevity Ltd | Information & communication | 2019 |
| First Move Properties Limited | Administrative & support | 1992 |
| First Step Emea Limited | Administrative & support | 2011 |
| Firstxtra Commercial and Specialist Finance Limited | Financial services | 2024 |
| Firstxtra Financial Services Limited | Financial services | 2013 |
| Firstxtra Limited | Extraterritorial | 2021 |
| Firsty Group Limited | Information & communication | 2011 |
| Fisher Bricks Ltd | Real estate | 2024 |
| Fisher of Newbury Limited | Wholesale & retail | 2012 |
| Fisher Renewables Ltd | Professional & scientific | 2012 |
| Fit 4 Work Limited | Health & social care | 2007 |
| FIT2EXIT Limited | Professional & scientific | 2025 |
| Fitizen Ltd | Manufacturing | 2015 |
| Flameworks Services Ltd | Wholesale & retail | 2007 |
| Flapjack Octopus Limited | Hospitality | 2010 |
| Flashback Cameras Ltd | Wholesale & retail | 2026 |
| Fleet Direct Sales Ltd | Wholesale & retail | 2023 |
| Fleet Street Print & Design Limited | Manufacturing | 2006 |
| Fleetcliff (Newbury) Limited | Real estate | 2021 |
| Flex Health Hub Limited | Health & social care | 2025 |
| Flexford Court Management Company Limited | Households | 1985 |
| Flexigasuk Limited | Wholesale & retail | 2017 |
| Flightless Aviation Limited | Transport & logistics | 2024 |
| Flint & Arrow Consulting Limited | Information & communication | 2026 |
| Floor Ninja Ltd | Construction | 2019 |
| Floors Stud Limited | Agriculture & fishing | 2020 |
| Florian Holdings Limited | Professional & scientific | 2014 |
| Flow Heating Solutions Limited | Construction | 2017 |
| Floxpad Ltd | Information & communication | 2025 |
| Fluid Innovation Limited | Construction | 2006 |
| Fluid Maintenance Services Limited | Manufacturing | 2003 |
| Fluid Perspectives Limited | Professional & scientific | 2017 |
| Flutterby Crafts Limited | Wholesale & retail | 2004 |
| Flying a Services Limited | Administrative & support | 1994 |
| Foconis UK Ltd | Administrative & support | 1983 |
| Focus Executive Limited | Administrative & support | 1988 |
| Focus Plus Limited | Professional & scientific | 2007 |
| Focus Stoves Limited | Wholesale & retail | 1997 |
| Foden Grealy Limited | Professional & scientific | 2008 |
| Folan Contracting and Sons Limited | Construction | 2011 |
| Foley Lodge Limited | Professional & scientific | 1975 |
| Follywood Transport Services Ltd | Transport & logistics | 2023 |
| Food Connects Ltd | Wholesale & retail | 2013 |
| Food Partners SJT Ltd | Wholesale & retail | 2014 |
| Foodmedia Ltd | Professional & scientific | 2016 |
| Ford Mcdonald Consultancy Limited | Professional & scientific | 2004 |
| Forever Loved Horse Therapy CIC | Health & social care | 2022 |