| Fairue Healthcare Ltd | Health & social care | 2016 |
| Fairview Road Management Company Limited | Households | 2017 |
| Faith Movie UK Limited | Information & communication | 2019 |
| Faith TV Limited | Information & communication | 2010 |
| Faiths Care Ltd | Administrative & support | 2021 |
| Faiths Care Training Academy and Staffing Ltd | Administrative & support | 2025 |
| Faithworld Television Limited | Information & communication | 2011 |
| Faktisk Limited | Information & communication | 2023 |
| Falcon Contracting Ltd | Construction | 2020 |
| Falcon Eco Cleaning Ltd | Administrative & support | 2024 |
| Falcon Roofing and Building Limited | Construction | 2025 |
| Falconer Medical Ltd | Health & social care | 2025 |
| Falmec UK Limited | Extraterritorial | 2019 |
| Familia Legatum Ltd | Real estate | 2019 |
| Families Empowered Limited | Health & social care | 2011 |
| Family Affairs Mentorship Initiative Ltd | Information & communication | 2026 |
| Family Feast Ltd | Hospitality | 2025 |
| Family Landscapes Ltd | Health & social care | 2015 |
| Family Rule Ltd | Manufacturing | 2016 |
| Familya Care Services Ltd. | Health & social care | 2018 |
| Fanig Solutions Ltd | Administrative & support | 2025 |
| Fans of Fans Company Limited | Wholesale & retail | 2023 |
| FAR From the Madding Crowd Events Ltd | Administrative & support | 2021 |
| Faradent Limited | Manufacturing | 2026 |
| Fardings Ltd | Education | 2016 |
| Farhad Mashadi Properties Limited | Real estate | 2022 |
| Farm House Fuels Limited | Wholesale & retail | 2015 |
| Farmer Legacy Group Limited | Financial services | 2023 |
| Farmhouse Cafe Halesworth Limited | Hospitality | 2019 |
| Farmhouse Fuels Biomass Limited | Wholesale & retail | 2021 |
| Farne Associates Limited | Information & communication | 2019 |
| Farnsworth House Management Limited | Real estate | 2012 |
| Farranti Property Ltd | Real estate | 2017 |
| Farrell Physiotherapy Ltd | Health & social care | 2003 |
| Farrow Commercial Thorrington 2025 LLP | | 2025 |
| Fascias ETC Ltd | Construction | 2020 |
| Fascination TV Productions Limited | Information & communication | 2015 |
| Fase Property Ltd | Real estate | 2010 |
| Fashion Cafe Bar Ltd | Hospitality | 2013 |
| Fashion Distribution Limited | Transport & logistics | 1982 |
| Fast Food Supplies (Anglia) Limited | Hospitality | 1987 |
| Fast Precast Ltd | Construction | 2025 |
| Fastrack Group Limited | Administrative & support | 2008 |
| Fastrack Leisure Limited | Extraterritorial | 2011 |
| Fastracker Ltd. | Wholesale & retail | 1998 |
| Fastrent Ltd | Financial services | 2004 |
| Fastship UK Limited | Transport & logistics | 2000 |
| FAT Property Limited | Real estate | 2024 |
| Fatcat Removals Limited | Transport & logistics | 2015 |
| Father's Field Developments Limited | Arts & recreation | 1999 |
| Fathom Deep Ltd | Real estate | 2022 |
| Fatisha Boutique Limited | Wholesale & retail | 2020 |
| Faux Limited | Information & communication | 2026 |
| Faversham Stone Limited | Construction | 2025 |
| Favoured Services Limited | Health & social care | 2016 |
| Fawnoak Estates Limited | Households | 1994 |
| FAZALWAINS1 Ltd | Wholesale & retail | 2025 |
| FB Dragon Ltd | Wholesale & retail | 2026 |
| FB Garden Ltd | Administrative & support | 2026 |
| Fbrs Investments Limited | Real estate | 2023 |
| FC Bostock Ltd | Real estate | 2025 |
| FC Wells Scaffolding Ltd | Construction | 2026 |
| FCA Automotive Limited | Information & communication | 2011 |
| Fcdd Ltd | Hospitality | 2020 |
| FDR Estates Ltd | Real estate | 2025 |
| FDR Ltd | Professional & scientific | 2023 |
| FDY Building Services Ltd | Construction | 2019 |
| FEA Electrical Services Ltd | Administrative & support | 2017 |
| FEA Property Ltd | Real estate | 2025 |
| Feast Colchester Ltd | Hospitality | 2018 |
| Featherstone Social Work Services Limited | Health & social care | 2014 |
| Fedarlu Ltd | Information & communication | 2026 |
| Feel OK Ltd | Information & communication | 2025 |
| Feelcool Ltd | Construction | 2022 |
| Feellocal Food and Wine Ltd | Wholesale & retail | 2022 |
| Feering Hill Management Company Limited | Households | 2000 |
| Feis Catering Ltd | Hospitality | 2025 |
| Feliana Enterprise Limited | Other services | 2012 |
| Felicitas Ltd | Extraterritorial | 2016 |
| Felicitous Foodology UK Limited | Education | 2024 |
| Felix Cleaning Ltd | Administrative & support | 2016 |
| Felix Culpa Limited | Professional & scientific | 2015 |
| Felixstowe Management Services Limited | Real estate | 2022 |
| Felixstowe Mortgage Centre Limited | Financial services | 2014 |
| Fellside Engineering Limited | Administrative & support | 2011 |
| Felstead Cleaning & Gardening Ltd | Administrative & support | 2018 |
| Felstead Property Maintenance Ltd | Administrative & support | 2011 |
| Felsted Mackins Ltd | Wholesale & retail | 2022 |
| Feltham Hill Estates Limited | Professional & scientific | 1936 |
| Female Explorers Ltd | Administrative & support | 2024 |
| Females in Motorsport Limited | Manufacturing | 2023 |
| Femco Services Limited | Public administration | 2023 |
| Femefab Ltd | Manufacturing | 2025 |
| Femioguns Ltd | Health & social care | 2025 |
| FEN Bears Ltd | Hospitality | 2023 |
| FEN Street Designs Ltd | Information & communication | 2022 |
| Fencing and Landscaping Solutions Ltd | Administrative & support | 2019 |
| Fendente Communications Ltd | Professional & scientific | 2025 |
| Fenn Wright LLP | | 2020 |
| Fenniks Reinsurance Management Limited | Financial services | 2009 |