| FAT Lass Preserves Ltd | Manufacturing | 2017 |
| Fatboyz Takeaway Limited | Hospitality | 2025 |
| Fateh Process Consultancy Limited | Administrative & support | 2016 |
| Fattoush Spice Ltd | Wholesale & retail | 2018 |
| Faulknerbrowns Holdings Limited | Financial services | 2025 |
| Faulknerbrowns LLP | | 2013 |
| Faulknerbrowns Projects Limited | Professional & scientific | 2026 |
| Fave Spot Ltd | Hospitality | 2023 |
| Favonius Consulting Limited | Professional & scientific | 2020 |
| Fawcett Street Services Ltd | Professional & scientific | 2021 |
| Fawdon Eatery Ltd | Hospitality | 2015 |
| Fawdon Wine Centre Limited | Wholesale & retail | 2019 |
| Fayaz Bikhan Ltd | Wholesale & retail | 2015 |
| Faybil Maintanence Services Ltd | Real estate | 2025 |
| Faydani Skin Clinic Ltd | Other services | 2016 |
| Fayle-Russell Group Ltd | Professional & scientific | 2023 |
| Fayms NE Ltd | Wholesale & retail | 2025 |
| Fayms Properties Limited | Real estate | 2025 |
| Fayms Retails Limited | Wholesale & retail | 2019 |
| Fazal Sweet Centre Ltd | Manufacturing | 2025 |
| Fazals Boro Ltd | Wholesale & retail | 2025 |
| Fazil Fazmi Ltd | Professional & scientific | 2018 |
| FB Performance Cars Ltd | Wholesale & retail | 2023 |
| FBA Fast Track Limited | Professional & scientific | 2025 |
| FBZ Inc. Ltd | Real estate | 2020 |
| FC Apparel Ltd | Wholesale & retail | 2019 |
| FC Containers Ltd | Wholesale & retail | 2025 |
| Fcatch Ltd | Hospitality | 2025 |
| FDN Developments Limited | Construction | 2025 |
| FDP Blyth Limited | Health & social care | 2017 |
| Fdrgroupuk Limited | Real estate | 2024 |
| Fdsinstallations Limited | Construction | 2020 |
| Fearless Christian Ltd | Wholesale & retail | 2025 |
| Fearless Focus Ltd | Other services | 2024 |
| Fearons Wedding Cars Limited | Administrative & support | 2019 |
| Fearworks Media Ltd. | Manufacturing | 2011 |
| Featherstone Development Ltd | Real estate | 2020 |
| Federation of Asian Business | Information & communication | 2017 |
| Feds Newcastle Limited | Hospitality | 2025 |
| Feedom Ltd | Wholesale & retail | 2024 |
| Feel Good Autos Limited | Wholesale & retail | 2022 |
| Feel Good Promotions Ltd | Other services | 2010 |
| Feel Music Production Ltd | Information & communication | 2022 |
| Feis Life App Limited | Information & communication | 2018 |
| Feistv.Com Limited | Information & communication | 2022 |
| Feka Limited | Information & communication | 2020 |
| Felicity's Holidays Ltd | Hospitality | 2025 |
| Fell House Farm Residents Management Company Limited | Real estate | 2009 |
| Fellside Properties Limited | Real estate | 1997 |
| Fellwood Supplies Ltd | Administrative & support | 2018 |
| FEM in Stem Ltd | Other services | 2025 |
| Femcore Digital Solutions Ltd | Wholesale & retail | 2026 |
| Feminism Art Maintenance Limited | Information & communication | 2025 |
| Fence Post LP | | 2012 |
| Fencer Hill Square RTM Company Limited | Households | 2020 |
| Fengshuihall Ltd | Real estate | 2026 |
| Fenham Carpet and Flooring Limited | Wholesale & retail | 2020 |
| Fenham Hotel Express Limited | Hospitality | 2019 |
| Fenham Properties Limited | Real estate | 2013 |
| Fenham Road Jewellers Ltd | Other services | 2025 |
| Fenham Stores Newcastle Ltd | Wholesale & retail | 2019 |
| Fenham Travel Ltd | Transport & logistics | 2026 |
| Fenhamspice Ltd | Hospitality | 2024 |
| Fenhom Ltd | Wholesale & retail | 2022 |
| Fenton Allan Ltd | Construction | 2024 |
| Fenton Brook Developments Limited | Real estate | 2007 |
| Fenton Homes Ltd | Construction | 2020 |
| Fenwick 141 Limited | Administrative & support | 2020 |
| Fenwick 1882 Limited | Financial services | 2022 |
| Fenwick of Bond Street Limited | Professional & scientific | 1965 |
| Fenwick of Leicester Limited | Professional & scientific | 1898 |
| Fenwick of Newcastle Limited | Professional & scientific | 1965 |
| Fenwick Property Holdings Limited | Administrative & support | 2020 |
| Ferdowsi Limited | Hospitality | 2017 |
| Ferguson King Consulting Ltd | Professional & scientific | 2022 |
| Ferguson Tyne Construction Ltd | Construction | 2025 |
| Fern Avenue Developments Limited | Construction | 2021 |
| Fern Avenue Masonic Company Limited | Other services | 1981 |
| Fern Avenue Properties LLP | | 2024 |
| Fern Contracting Ltd | Professional & scientific | 2023 |
| Fern Court Developments Ltd | Real estate | 2023 |
| Fern Design Studios Ltd | Information & communication | 2015 |
| Ferndene Trading Ltd | Health & social care | 2023 |
| Fernwood Cars Limited | Wholesale & retail | 2024 |
| Ferro Developments Limited | Real estate | 2005 |
| Ferro ELY Windows & Doors Limited | Financial services | 2024 |
| Ferro G&E Limited | Financial services | 2026 |
| Ferro Harvey Renewables Limited | Financial services | 2025 |
| Ferro Heat Pumps Limited | Financial services | 2025 |
| Ferro L&P Limited | Financial services | 2026 |
| Ferro Property Services Limited | Financial services | 2024 |
| Ferro Renewables Limited | Financial services | 2025 |
| Ferry Homely UK Limited | Wholesale & retail | 2026 |
| Fertile Ground Dance Ltd | Arts & recreation | 2017 |
| FES Developments Ltd | Construction | 2024 |
| Fettler Design Limited | Manufacturing | 2026 |
| Fewer Moving Parts Limited | Professional & scientific | 2019 |
| Fewster Square Health Limited | Wholesale & retail | 2025 |
| FF Estates Ltd | Real estate | 2020 |
| FF Partners Limited | Health & social care | 2021 |