| Fine Sports Group Limited | Wholesale & retail | 2024 |
| Fine Watch Club Ltd | Wholesale & retail | 2019 |
| Finedale Foods Ltd | Manufacturing | 2017 |
| Finelight Agencies Limited | Extraterritorial | 2011 |
| Finelight Group Limited | Professional & scientific | 2016 |
| Finelight Media Group Ltd | Professional & scientific | 2025 |
| Finelight Media Limited | Information & communication | 1999 |
| Fineline Decorating (Anglia) Limited | Construction | 2026 |
| Fineline Landscaping Ltd | Administrative & support | 2024 |
| Finer Collectives Limited | Hospitality | 2023 |
| Finesse Desserts Enterprises Limited | Hospitality | 2017 |
| Finesse Desserts Walsall Ltd | Hospitality | 2017 |
| Finesse Glazing Ltd | Construction | 2016 |
| Finesse Property (Norwich) Ltd | Real estate | 2021 |
| Finest Foods Group Ltd | Wholesale & retail | 2021 |
| Finlay Homes Ltd | Real estate | 2015 |
| Finlex International Limited | Wholesale & retail | 2016 |
| Finnemore Cleaning Services Ltd | Administrative & support | 2023 |
| Finovate Management Solutions Ltd | Professional & scientific | 2025 |
| Finsure Premium Finance Limited | Financial services | 1982 |
| Fintech Innovation Group Ltd | Information & communication | 2025 |
| Fintor Ltd | Real estate | 2016 |
| Finza Consulting Ltd | Professional & scientific | 2019 |
| Fiona Sykes Executive Coaching Ltd | Professional & scientific | 2019 |
| FIR BCB Limited | Other services | 2019 |
| Firbanks Close Management Company Limited | Real estate | 2021 |
| Firdaus Perfume Ltd | Wholesale & retail | 2025 |
| Fire and Flux Ceramics Limited | Arts & recreation | 2016 |
| Fire Assess & Extinguish Ltd | Administrative & support | 2017 |
| Fire Frenzy Ltd | Wholesale & retail | 2020 |
| Fire Guard (East Anglia) UK Ltd | Administrative & support | 2023 |
| Fire Investments London Ltd | Real estate | 2022 |
| Fire Izakaya Limited | Hospitality | 2022 |
| Fire Nutrition Ltd | Wholesale & retail | 2024 |
| Fire Risk Management Solutions Ltd | Other services | 2022 |
| Fire Safety Assessments Ltd | Other services | 2010 |
| Firebirds Group Limited | Financial services | 2026 |
| Firebirds HQ Limited | Hospitality | 2025 |
| Firecat Software Ltd | Information & communication | 2018 |
| Fired UP Food Company Limited | Hospitality | 2007 |
| Firedoor Sales Limited | Other services | 2025 |
| Firefite Boxcross Ltd | Arts & recreation | 2023 |
| Fireflow Entertainment Ltd | Arts & recreation | 2021 |
| Firefly Bookkeeping Ltd | Professional & scientific | 2010 |
| Firefly Tipis & Events Ltd | Administrative & support | 2020 |
| Firefox Coastal Limited | Construction | 2010 |
| Firefox Electrical Services Ltd | Extraterritorial | 2013 |
| Fireguard Interiors + Ltd | Construction | 2025 |
| Fireguard National Ltd | Administrative & support | 2023 |
| Firenze Properties Limited | Real estate | 2024 |
| Firepit Media Ltd | Professional & scientific | 2020 |
| Firestarter Films Ltd | Information & communication | 2025 |
| Firestone Films Limited | Information & communication | 2013 |
| Firewing Kitchen Ltd | Hospitality | 2025 |
| Fireworld International Ltd | Administrative & support | 2018 |
| Firminger Property Estates Ltd | Construction | 2025 |
| Firs Park Residents Management Company Limited | Households | 2017 |
| First ADE Computers Limited | Other services | 2001 |
| First AID at Work Norfolk Ltd | Health & social care | 2011 |
| First Class Closing Ltd | Professional & scientific | 2025 |
| First Class First AID Ltd | Education | 2020 |
| First Class Rides Ltd | Transport & logistics | 2024 |
| First Class Taxis Limited | Transport & logistics | 2022 |
| First Decorators Ltd | Construction | 2018 |
| First Draft Bar & Kitchen Ltd | Hospitality | 2023 |
| First Eastern Counties Buses Limited | Transport & logistics | 1931 |
| First Eco Solutions Ltd | Water & waste | 2020 |
| First Eleven Capital Holding Ltd | Financial services | 2021 |
| First Glance Ultrasound Ltd | Health & social care | 2025 |
| First Hand Learning Ltd | Manufacturing | 2005 |
| First Health (UK) Limited | Health & social care | 2005 |
| First Home Improvements (England) Limited | Wholesale & retail | 2008 |
| First Light Films Ltd | Arts & recreation | 2018 |
| First Line Event Security Ltd | Administrative & support | 2008 |
| First Line Training Solutions Ltd | Education | 2024 |
| First Property Limited | Real estate | 1982 |
| First Steps Norwich CIC | Education | 2023 |
| First Teachers Ltd | Education | 2023 |
| First Time Delivery Ltd | Transport & logistics | 2017 |
| First Vehicle Sales Limited | Wholesale & retail | 2024 |
| First-Connect Fire & Security Ltd | Administrative & support | 2007 |
| Firstcall 247 Norwich Limited | Administrative & support | 2020 |
| Firstcourt (RTM) Company Limited | Households | 2015 |
| Firstlight Solar Ltd | Construction | 2026 |
| Firstmead Limited | Real estate | 2000 |
| Fish Conservation Society | Other services | 2026 |
| Fish DNA Ltd | Information & communication | 2010 |
| Fisher & Sons (Fakenham) Limited | Professional & scientific | 2009 |
| Fisher and Co. Solicitors Ltd | Professional & scientific | 2022 |
| Fisher Healthcare East Anglia Ltd | Administrative & support | 2017 |
| Fisher Healthcare Kings Lynn Ltd | Administrative & support | 2017 |
| Fisher Healthcare Limited | Administrative & support | 2011 |
| Fishergate Limited | Real estate | 2012 |
| Fisherlegal LLP | | 2016 |
| Fishermans Return Limited | Hospitality | 2011 |
| Fishers Green Ltd | Real estate | 2017 |
| Fishfin Limited | Financial services | 2010 |
| Fishwick & Reader Electrical Ltd | Construction | 2022 |
| Fiszbach Ltd | Health & social care | 2024 |
| Fit and FIX Property Solutions Limited | Construction | 2025 |