| Fit Interior Ltd | Construction | 2018 |
| Fitness Resolutions Limited | Arts & recreation | 2016 |
| Fitt Construction Limited | Construction | 2015 |
| Fitt Signs Limited | Manufacturing | 2016 |
| Fitter Body Ladies Norwich Ltd | Arts & recreation | 2023 |
| Fitter Faster Stronger Ltd | Other services | 2024 |
| Fitzmaurice Engineers Limited | Professional & scientific | 1973 |
| Fitzmaurice Group Limited | Financial services | 2024 |
| Fitzmaurice Holdings Limited | Transport & logistics | 1973 |
| Five IT Consultancy Limited | Information & communication | 2023 |
| Five Percent Studios Ltd | Information & communication | 2026 |
| Five Roses Limited | Administrative & support | 2021 |
| Five Ways Farm Limited | Agriculture & fishing | 2005 |
| Fixers UK Construction Ltd | Administrative & support | 2017 |
| Fixo Business Solutions Ltd | Professional & scientific | 2025 |
| Fixo Retail Solutions Ltd | Wholesale & retail | 2025 |
| Fixr Ltd | Professional & scientific | 2022 |
| Fixstik Ltd | Wholesale & retail | 2021 |
| Fizz and Fromage Limited | Hospitality | 2021 |
| FJD Holdings Limited | Professional & scientific | 2021 |
| FJM Entertainment Ltd | Arts & recreation | 2021 |
| FJP Consultants Limited | Administrative & support | 2007 |
| FJV & Partners Limited | Administrative & support | 2005 |
| FK Electrical Services Ltd | Manufacturing | 2018 |
| FKB Electrical Services Ltd | Construction | 2015 |
| FKK 01 Limited | Professional & scientific | 2005 |
| FKK 02 Limited | Professional & scientific | 2002 |
| FKK Investments Ltd | Administrative & support | 2016 |
| Flacara Limited | Hospitality | 2023 |
| Flagship Finance PLC | Professional & scientific | 2021 |
| Flagship Garden Products Limited | Manufacturing | 2024 |
| Flagship Housing Developments Limited | Real estate | 2004 |
| Flair Content Ltd | Information & communication | 2026 |
| Flamentina UK Ltd | Wholesale & retail | 2013 |
| Flamin' Briefcase Gaming Ltd | Information & communication | 2017 |
| Flamingo Cleaning Company Ltd | Administrative & support | 2023 |
| Flamingo Domestic Services Limited | Households | 2012 |
| Flanerie Ltd | Arts & recreation | 2022 |
| Flash Residential Ltd | Real estate | 2021 |
| Flashpoint Fabrications Limited | Construction | 2007 |
| Flashtech Motorsport Ltd | Arts & recreation | 2020 |
| Flathouse Developments Ltd | Construction | 2017 |
| Flatout Events Limited | Administrative & support | 2024 |
| Flattnoffki Music Limited | Information & communication | 2014 |
| Flava Properties Ltd | Construction | 2018 |
| Flavajam Ltd | Hospitality | 2026 |
| Flaverton Engineering & Consultancy Services Limited | Professional & scientific | 2017 |
| Flavourznvibez Limited | Hospitality | 2023 |
| Flawless Cleaning Norfolk Ltd | Administrative & support | 2022 |
| Fleet Precision Engineering Ltd | Manufacturing | 2023 |
| Fleet Seats Ltd | Wholesale & retail | 2026 |
| Fleet Seven Ltd | Extraterritorial | 2017 |
| Fletcher Anaesthetic Services Limited | Health & social care | 2015 |
| Fleve Collections Limited | Administrative & support | 2015 |
| Flex Blend Ltd | Wholesale & retail | 2024 |
| Flexi Personnel Ltd | Administrative & support | 2019 |
| Flexible Design & Automation Limited | Manufacturing | 2003 |
| Flexible Lettings Ltd | Real estate | 2025 |
| Flexitech Software Limited | Information & communication | 2016 |
| Flexx LEX Ltd | Wholesale & retail | 2018 |
| Flexx LEX X Limited | Wholesale & retail | 2024 |
| Flight Management Ltd | Transport & logistics | 2023 |
| Flight Software Services Ltd | Information & communication | 2013 |
| Flight Training East Anglia Ltd | Education | 2024 |
| Flights International Midland Ltd | Information & communication | 2014 |
| Flint and Feather Ltd | Construction | 2020 |
| Flint Environmental Services Limited | Professional & scientific | 2003 |
| Flint Estates (Bergh Apton) Ltd | Real estate | 2001 |
| Flint Film Studios Limited | Information & communication | 2025 |
| Flint Finance Limited | Financial services | 2022 |
| Flint Property Solutions Limited | Real estate | 2019 |
| Flint Surveyors Limited | Professional & scientific | 2020 |
| Flipr Ltd | Wholesale & retail | 2019 |
| Flixton Mushrooms Ltd. | Agriculture & fishing | 1998 |
| Float Norwich Ltd | Wholesale & retail | 2022 |
| Float Online Ltd | Professional & scientific | 2020 |
| Floc Events Limited | Hospitality | 2020 |
| Flock Coffee House (Norwich) Ltd | Hospitality | 2025 |
| Flock Sense Ltd | Professional & scientific | 2025 |
| Flomotion Studio Ltd | Wholesale & retail | 2021 |
| Floodlight Finds Limited | Wholesale & retail | 2026 |
| Floor Finishers Ltd | Construction | 2016 |
| Floorbase Limited | Wholesale & retail | 1988 |
| Floorbox Ltd | Administrative & support | 2016 |
| Floored Genius (UK) Limited | Construction | 2010 |
| Floorflow UK Limited | Construction | 2011 |
| Flooring Fellas Ltd | Construction | 2026 |
| Flooring Supplies Anglia Limited | Wholesale & retail | 1982 |
| Floorless (Norfolk) Limited | Construction | 2017 |
| Flooteg Ltd | Energy | 2024 |
| Flora Events Norfolk Ltd | Hospitality | 2026 |
| Flora Holdings Ltd | Construction | 2026 |
| Floral Image Band Limited | Arts & recreation | 2026 |
| Flora’L Works Ltd | Information & communication | 2023 |
| Florence Horrigan Ltd | Financial services | 2023 |
| Florence Penny Ltd | Administrative & support | 2019 |
| Florentina Catering Ltd | Hospitality | 2025 |
| Florida Transport Ltd | Transport & logistics | 2016 |
| Florins DRY Cleaners & Laundry Specialists Limited | Other services | 2024 |
| Flotel Limited | Real estate | 2022 |