| Fairbairn Capital Limited | Administrative & support | 2020 |
| Fairbairn Services Ltd | Administrative & support | 2023 |
| Faire Sailing Ltd | Manufacturing | 2022 |
| Faire-Ring Marine Limited | Transport & logistics | 2024 |
| Fairfax and Favor Ltd | Wholesale & retail | 2013 |
| Fairfield Road Residents Management Company Limited | Households | 2026 |
| Fairlight Holdings Limited | Hospitality | 2019 |
| Fairlight Lodge Limited | Hospitality | 2009 |
| Fairway Tax and Accounting Limited | Professional & scientific | 2023 |
| Fairways Build Limited | Construction | 2021 |
| Faith Hotels Limited | Hospitality | 2015 |
| Faithlicious Ltd | Hospitality | 2023 |
| Fakenham and District Funeral Services Limited | Other services | 2017 |
| Fakenham Town Football Club Limited | Arts & recreation | 2022 |
| Falcon Catering Equipment Limited | Extraterritorial | 1952 |
| Family Care Direct Cremations Ltd | Other services | 2026 |
| Family Store Ltd. | Administrative & support | 2019 |
| Family Support Centre Limited | Administrative & support | 2012 |
| Fandabbydaisy Limited | Wholesale & retail | 2008 |
| Farias Goncalves Health Ltd | Health & social care | 2022 |
| Farmington Ltd | Wholesale & retail | 2025 |
| Farmyard Frozen Ltd | Hospitality | 2021 |
| Farnol Ltd | Financial services | 2025 |
| Fast Bunny Wholesale Limited | Wholesale & retail | 2021 |
| Fast Road Tuning Ltd | Wholesale & retail | 2023 |
| Fast Valet Ltd | Administrative & support | 2021 |
| Fastfix UK Garage Doors Ltd | Construction | 2012 |
| FAT Jackson Ltd | Professional & scientific | 2024 |
| Fawcitt Properties Ltd | Real estate | 2025 |
| FD Accommodations Ltd | Hospitality | 2026 |
| FD Property & Lettings Ltd | Real estate | 2025 |
| FDR Property Ltd | Real estate | 2024 |
| Federal Air Filtration Limited | Manufacturing | 2001 |
| Feet UP Travel Ltd | Professional & scientific | 2024 |
| Feminine Touch KBB Limited | Other services | 2018 |
| FEN Lane Ltd | Wholesale & retail | 2024 |
| Fenkleen Hygiene EOT Limited | Administrative & support | 2022 |
| Fenkleen Hygiene Ltd | Construction | 2009 |
| Fenland Animal Rehabilitation Ltd | Professional & scientific | 2022 |
| Fenland Green Energy Ltd | Energy | 2010 |
| Fenland Home Improvements Ltd | Construction | 2019 |
| Fenland Logistics Limited | Transport & logistics | 2016 |
| Fenns of Lynn Limited | Wholesale & retail | 2008 |
| Fenscape Fencing Ltd | Other services | 2020 |
| Feral Cat Ltd | Information & communication | 2015 |
| Fernstart Consulting Limited | Administrative & support | 2025 |
| Ferry Lane Social Club Limited | Other services | 2017 |
| Festival TOO | Arts & recreation | 1990 |
| Festival TOO Trust Limited | Arts & recreation | 2013 |
| FGC Carpentry Ltd | Manufacturing | 2023 |
| Field and Marsh Limited | Agriculture & fishing | 2021 |
| Field View Lane Residents Management Company Limited | Other services | 2016 |
| Fifp & Carpentry Solutions Ltd | Construction | 2017 |
| Filtered Naturally Limited | Construction | 2025 |
| Finch Home Limited | Manufacturing | 2024 |
| Finchley Morgan Limited | Professional & scientific | 2021 |
| Fine Finish Ltd | Construction | 2014 |
| Finsurge (UK) Ltd | Information & communication | 2020 |
| Firesafety Consulting Limited | Professional & scientific | 2024 |
| Firesafety-Uk Limited | Professional & scientific | 2023 |
| First Glass Wine Services Limited | Hospitality | 2014 |
| First Renewable Alpha Limited | Construction | 2015 |
| Fistein Enterprises Ltd | Professional & scientific | 2011 |
| Fitton Homes Limited | Real estate | 2019 |
| Fitton Oake Developments Ltd | Construction | 2016 |
| Fitton Support Services Limited | Information & communication | 2016 |
| Five Star Nails 33 Ltd | Other services | 2021 |
| FIX Car Body Repair Ltd | Wholesale & retail | 2023 |
| Flair Property Maintenance Limited | Administrative & support | 2006 |
| Fleet Timber Supplies Limited | Wholesale & retail | 1999 |
| Fleming Residential Limited | Real estate | 1989 |
| Flexo Limited | Wholesale & retail | 2025 |
| Flights of Fantasy Creative Play (Care and Maintenance) Limited | Manufacturing | 2022 |
| Floorguarddirect Ltd | Wholesale & retail | 2019 |
| Flooring 24/7 Ltd | Construction | 2014 |
| Florens Timber Limited | Wholesale & retail | 2015 |
| Flowpack Limited | Manufacturing | 2000 |
| Flubs LLP | | 2018 |
| Fluential Ltd | Professional & scientific | 2018 |
| Fodderston Farm House Limited | Administrative & support | 2014 |
| Fofwdc Limited | Manufacturing | 2023 |
| Folkfit Ltd | Arts & recreation | 2020 |
| Fomsa Ltd | Transport & logistics | 2022 |
| Foobaero Limited | Professional & scientific | 2026 |
| Food & Things Ltd | Wholesale & retail | 2017 |
| Food IS Glorious Ltd | Other services | 2015 |
| Food Safety Greg Limited | Professional & scientific | 2026 |
| Foodworks Consultancy Limited | Administrative & support | 2014 |
| Foras Limited | Manufacturing | 2005 |
| Forbes Technologies Limited | Manufacturing | 1983 |
| Force Aero Ltd | Professional & scientific | 2019 |
| Foreman Hurley Properties Ltd | Real estate | 2022 |
| Forever Memories 23 Ltd | Extraterritorial | 2020 |
| Foreward Healthcare Ltd | Health & social care | 2019 |
| Forster Accounting Ltd | Professional & scientific | 2015 |
| Forteenforty Fitness Ltd | Arts & recreation | 2026 |
| Forward Day Centre Limited | Health & social care | 1998 |
| Four Transport Ltd | Transport & logistics | 2021 |
| FOX Anglia Homes Limited | Construction | 2018 |
| FP Sporting Ltd | Agriculture & fishing | 2021 |