| Faizey Leather Goods Ltd | Manufacturing | 2010 |
| Falcon Engineering Solutions Ltd | Manufacturing | 2025 |
| Falconhurst Estates Limited | Real estate | 1999 |
| Falkirk Equipment Limited | Administrative & support | 2026 |
| Fallon & Wolf Ltd | Professional & scientific | 2024 |
| Farhan Mart Limited | Wholesale & retail | 2025 |
| Farmtell Limited | | 1983 |
| Farradata Consulting Services Limited | Information & communication | 2021 |
| Farringdon Develop Ltd | Construction | 2019 |
| Farrington Industries Limited | Manufacturing | 1999 |
| Fast & Furious Freight Ltd | Transport & logistics | 2018 |
| Fast Track UK Limited | Professional & scientific | 2002 |
| Fatima Techworks Limited | Wholesale & retail | 2025 |
| Faun Zoeller (UK) Limited | Wholesale & retail | 1963 |
| Featherbed Lets Ltd | Real estate | 2025 |
| Featherbed Stays Ltd | Hospitality | 2022 |
| Feckenham Gardens Management Company Limited | Households | 2017 |
| Fegamo Ltd | Information & communication | 2015 |
| Feli&Dani Ltd | Wholesale & retail | 2023 |
| Fence-Line Limited | Administrative & support | 2003 |
| Fencing and Construction Training Ltd | Education | 2010 |
| Ferris Group Limited | Administrative & support | 2011 |
| Ferris Leisure Ltd | Arts & recreation | 2008 |
| Ferris South West Limited | Construction | 2024 |
| Ferrisuk Ltd | Manufacturing | 2015 |
| Ferrow Pavilions Limited | Construction | 2026 |
| Fertech Ltd | Agriculture & fishing | 2020 |
| Festival of Antiques Limited | Administrative & support | 2017 |
| Fiazone Digital Solution Ltd | Wholesale & retail | 2026 |
| Fibrehydrate Ltd. | Information & communication | 2017 |
| Field Communications Services Limited | Other services | 2018 |
| Field View Care Home Ltd | Health & social care | 2024 |
| Field View Home Care Ltd | Health & social care | 2025 |
| Fields Farm Events Limited | Hospitality | 2025 |
| Fields Farm Stays Limited | Hospitality | 2026 |
| Fifi Mcgee Limited | Administrative & support | 2020 |
| FIL Logistics Ltd | Transport & logistics | 2024 |
| Filmcell Favourites Ltd | Manufacturing | 2013 |
| Fine Rooms & English Deli Ltd | Hospitality | 2019 |
| Fineranch Limited | Real estate | 2017 |
| Finn IT Limited | Information & communication | 2005 |
| Fiori Property Ltd | Real estate | 2024 |
| Fire Compliance Inspections Ltd | Public administration | 2019 |
| Fire Fighting Supplies Ltd | Wholesale & retail | 2025 |
| Fire Safe Security Limited | Extraterritorial | 2012 |
| Fireplace City (Redditch) Limited | Administrative & support | 2010 |
| Firmnest Health and Care Services Ltd | Professional & scientific | 2025 |
| First Light Developments Ltd | Real estate | 2020 |
| First Light Software Limited | Information & communication | 2010 |
| Firwood Paints Limited | Manufacturing | 1925 |
| Fish for Property Ltd | Financial services | 2023 |
| FISH4DOGS Limited | Manufacturing | 2020 |
| FISH4PETS Limited | Manufacturing | 2004 |
| Fisher Bookkeeping & Accounts Limited | Professional & scientific | 2019 |
| Fisher Care Services Limited | Health & social care | 2025 |
| FIT4FLEET Holdings Limited | Administrative & support | 2020 |
| FIT4FLEET Limited | Wholesale & retail | 2006 |
| Fitness Unlimited Limited | Arts & recreation | 2017 |
| Fixit ICT Ltd | Wholesale & retail | 2025 |
| Fizz POP Events Ltd | Hospitality | 2019 |
| FJK Construction & Facilities Ltd | Construction | 2019 |
| FJP Property Investing Limited | Hospitality | 2025 |
| FJT (Properties) Limited | Real estate | 2022 |
| FJT Consultancy Limited | Professional & scientific | 2022 |
| Flaming Nice Limited | Hospitality | 2024 |
| Flarepalm Limited | Financial services | 2018 |
| Flaro Ltd | Wholesale & retail | 2026 |
| Flash Fire and Security Ltd | Administrative & support | 2019 |
| Flat SIX Road and Race Engineering Limited | Professional & scientific | 2014 |
| Fletch Tech Limited | Professional & scientific | 2020 |
| Fletch Thomas Electrical Ltd | Construction | 2023 |
| Fletcher Construction Ltd | Construction | 2002 |
| Flex Flues Ltd | Construction | 2026 |
| Flexel 1986 Limited | Manufacturing | 2008 |
| Flexible Networking Solutions Ltd | Information & communication | 2012 |
| Flexure Limited | Manufacturing | 2011 |
| Flikon Network Limited | Wholesale & retail | 2025 |
| FLO Investment Holdings Ltd | Financial services | 2026 |
| Flojaytrans Ltd | Transport & logistics | 2024 |
| Floorcoat Limited | Construction | 2011 |
| Floors Reborn Ltd | Construction | 2024 |
| Floraverde Limited | Extraterritorial | 2009 |
| Florigo Limited | Wholesale & retail | 2009 |
| Flowers Forever Limited | Administrative & support | 2005 |
| Flusheco Limited | Manufacturing | 2016 |
| FLY by Nite Holdings Limited | Transport & logistics | 2019 |
| FLY by Nite Rehearsal Studio Limited | Arts & recreation | 2014 |
| Flyers by Night Ltd | Manufacturing | 2024 |
| Flynn-Ryan Property Ltd | Households | 2025 |
| FLZ Fit Ltd | Arts & recreation | 2017 |
| FM Products (Holdings) Limited | Financial services | 2023 |
| FM Products Limited | Wholesale & retail | 2004 |
| FM77 Holdco Ltd | Real estate | 2024 |
| FM77 Ltd | Construction | 2023 |
| Foden Electrical Contracting Limited | Construction | 2024 |
| Foge Care Ltd | Health & social care | 2014 |
| Folly Residents Management Ltd | Households | 2025 |
| Foodability Holdings Limited | Financial services | 2019 |
| Foodability Limited | Administrative & support | 2019 |
| Fooladi Properties Ltd | Real estate | 2024 |