| Flour & Bean Limited | Professional & scientific | 2013 |
| Flourish and Bloom Ltd | Professional & scientific | 2022 |
| Flovan Limited | Health & social care | 2015 |
| Flovan Property Limited | Real estate | 2018 |
| Flow Plumbing and Drainage Limited | Construction | 2026 |
| Flow Productions Limited | Other services | 2019 |
| Flow Utilities & Consultancy Ltd | Professional & scientific | 2025 |
| Flowapowa Limited | Information & communication | 2000 |
| Flower House Wroxham Ltd | Construction | 2024 |
| Flower Vision (East Anglia) Limited | Wholesale & retail | 2006 |
| Flowers by Nicole Ltd | Wholesale & retail | 2017 |
| Flowers by Sarah Jane Limited | Wholesale & retail | 2003 |
| Flowers Nicole the Franchise Limited | Wholesale & retail | 2020 |
| Flowline Plastics Ltd | Construction | 2009 |
| Floyd Driving Academy Ltd | Education | 2014 |
| FLS Wraps Ltd. | Wholesale & retail | 2025 |
| Fluffy Wambler Limited | Information & communication | 2025 |
| Fluffyegg Limited | Information & communication | 2012 |
| FLUID2 New Media Limited | Information & communication | 2004 |
| Fluidgrove Limited | Other services | 1991 |
| Fluke Precision Measurement Limited | Manufacturing | 1979 |
| Fluvial Ltd | Financial services | 2026 |
| Fluxcourier Logistics Limited | Administrative & support | 2025 |
| FLY a Flight Ltd | Other services | 2017 |
| Flydor Limited | Wholesale & retail | 2003 |
| Flying Forest Group Ltd | Financial services | 2022 |
| Flying Forest Limited | Manufacturing | 2024 |
| Flying Saucers Bar Ltd | Hospitality | 2022 |
| Flying Spur Group Limited | Financial services | 2020 |
| Flying Spur Limited | Health & social care | 2012 |
| Flying V Football Club Ltd | Arts & recreation | 2026 |
| FM Interim Solutions Ltd | Professional & scientific | 2018 |
| FM Office Services Ltd | Administrative & support | 2016 |
| FMC Enterprises Limited | Professional & scientific | 2015 |
| FMP Norfolk Limited | Wholesale & retail | 2008 |
| FMP Partnership Ltd | Financial services | 2017 |
| Fmuk Trading Ltd | Wholesale & retail | 2024 |
| FO Foods Ltd | Hospitality | 2021 |
| Foam Superstore Ltd | Manufacturing | 2018 |
| Foan Construction Limited | Construction | 2024 |
| Focalise Finance Limited | Financial services | 2024 |
| Focalise Funding Limited | Financial services | 2026 |
| Focalpoint Digital Limited | Professional & scientific | 2002 |
| Focus Caring Services Limited | Health & social care | 2004 |
| Focus CS Limited | Administrative & support | 2025 |
| Focus IT Management Limited | Information & communication | 2016 |
| Focus on the Future Ltd | Administrative & support | 2023 |
| Focus Property Group Limited | Administrative & support | 2017 |
| Focus Property Maintenance Group Limited | Households | 2025 |
| Focus Reports Limited | Information & communication | 2011 |
| FOD Fitness Limited | Arts & recreation | 2025 |
| Fold Digital Limited | Other services | 2015 |
| Folder Holdings Ltd | Extraterritorial | 2023 |
| Foldgate Property Investments Ltd | Construction | 2026 |
| Foley and Baugh Ltd | Professional & scientific | 2019 |
| Folio Developments Limited | Financial services | 2023 |
| Folio IQ Ltd | Information & communication | 2026 |
| Folio Life Limited | Construction | 2023 |
| Folio Life Stanford Limited | Real estate | 2008 |
| Folium Digital Marketing Ltd | Professional & scientific | 2022 |
| Folk Enterprises Limited | Construction | 2022 |
| Folklore Herbalist Ltd | Manufacturing | 2019 |
| Folks at Blakeney Ltd | Hospitality | 2023 |
| Folks Bakery Ltd | Manufacturing | 2023 |
| Folks Coffee Co Ltd | Hospitality | 2022 |
| Follies Classics Ltd | Wholesale & retail | 2017 |
| Food Delicious Group Ltd | Hospitality | 2019 |
| Food Delivery Service 123 Ltd | Transport & logistics | 2020 |
| Food Enterprise Park Limited | Agriculture & fishing | 2018 |
| Food for Living Limited | Professional & scientific | 1989 |
| Food for the Hungry UK | Health & social care | 1989 |
| Food Forensics Limited | Professional & scientific | 2011 |
| Food Merchants International Limited | Wholesale & retail | 1985 |
| Food Nest Ltd | Hospitality | 2022 |
| Food Nest Maryland Ltd | Hospitality | 2022 |
| Food Passport Ltd | Information & communication | 2026 |
| Food Processing Holding Ltd | Professional & scientific | 2015 |
| Food Republic Alum Rock Ltd | Hospitality | 2018 |
| Food, Farming and Sustainability Education Alliance Limited | Education | 2025 |
| Foodbycpc Ltd | Wholesale & retail | 2020 |
| Foodmex Ltd | Hospitality | 2020 |
| Foodsafety Experts Limited | Professional & scientific | 2002 |
| FOODSIE100 Limited | Hospitality | 2016 |
| Football Against Dementia CIC | Health & social care | 2025 |
| Football FUN Factory (Community 013) Ltd | Arts & recreation | 2020 |
| Football FUN Factory (Community 048) Limited | Arts & recreation | 2022 |
| Football FUN Factory (Community 063) Ltd | Arts & recreation | 2022 |
| Footprint Concept & Co Limited | Wholesale & retail | 2019 |
| FOR the Love of Norfolk Ltd | Wholesale & retail | 2023 |
| FOR Time Fitness Ltd | Wholesale & retail | 2020 |
| FOR Your Fries Only RB Ltd | Hospitality | 2026 |
| Forager Provisions Ltd | Wholesale & retail | 2023 |
| Ford UK Breakers Ltd | Wholesale & retail | 2018 |
| Forder Property Services Limited | Manufacturing | 2010 |
| Fordfit Personal Training Ltd | Arts & recreation | 2025 |
| Fordham Global Foresight Ltd | Professional & scientific | 2022 |
| Fordies Handyman Services Limited | Construction | 2025 |
| Foreacre Limited | Construction | 2025 |
| Foreacre SPV 1 Limited | Construction | 2025 |
| Foreacre SPV 2 Limited | Construction | 2025 |