| FAN Solutions Limited | Other services | 2013 |
| Fanshawe Road (Cambridge) Management Company Limited | Households | 2025 |
| Fanshawe Road (E1 and W2) Management Company Limited | Households | 2026 |
| Farehurst Park (Fulbourn) Block Management Company Limited | Households | 2025 |
| Farm Shop Fish Mongers Ltd | Wholesale & retail | 2026 |
| Fast GUJ Construction Limited | Construction | 2021 |
| Fastnett Fire & Security Limited | Other services | 2002 |
| Fastnett Limited | Other services | 2019 |
| FAT Boys Snack Bar Limited | Hospitality | 2026 |
| Father Alterin Limited | Manufacturing | 2021 |
| FB Transport Consultancy Ltd | Professional & scientific | 2026 |
| FBL Admin Solutions Limited | Administrative & support | 2023 |
| FBL Assets Limited | Real estate | 2025 |
| Fdbs London Ltd | Hospitality | 2023 |
| FDK Import & Export Company Limited | Wholesale & retail | 2022 |
| FELLOWSHIP5 Limited | Professional & scientific | 2017 |
| Female Narratives Ltd | Professional & scientific | 2017 |
| Femme Guide Ltd | Information & communication | 2020 |
| Fentax Limited | Other services | 2019 |
| Ferreh Limited | Real estate | 2025 |
| Festiva Ltd | Arts & recreation | 2017 |
| FG Electrical Systems Limited | Construction | 2024 |
| FG Landscaping Ltd | Construction | 2018 |
| Fieldie Ltd | Real estate | 2015 |
| Fifteen Thirty Company Limited | Other services | 2017 |
| Financial Consulting and Training Centre (Fctc) Limited | Information & communication | 2022 |
| Finch Nazareth Limited | Hospitality | 2019 |
| Find ME Funding Group Ltd | Professional & scientific | 2023 |
| Findpaws Ltd | Wholesale & retail | 2026 |
| Fineedge Interior Ltd | Construction | 2025 |
| Firat Salih Limited | Hospitality | 2018 |
| Fire & Ice Holdings Limited | Financial services | 2024 |
| Fire Pitt Limited | Wholesale & retail | 2025 |
| Fire Social Limited | Hospitality | 2026 |
| Firesafe Residential Solutions Ltd | Construction | 2025 |
| Firetech Life Safety Ltd | Administrative & support | 2026 |
| Firmiana Limited | Hospitality | 2025 |
| First Call Property Services Ltd | Administrative & support | 2018 |
| First Data Solutions Ltd | Information & communication | 2021 |
| First Stop Consultancy and Development Limited | Wholesale & retail | 2018 |
| Fish ARE Green Ltd | Arts & recreation | 2025 |
| Fitzsimmons Enterprises Limited | Real estate | 2019 |
| Flames Grill 38 Ltd | Hospitality | 2023 |
| Flames Oultonbroad Limited | Hospitality | 2024 |
| Flat 75 Limited | Real estate | 2002 |
| Fleur DE VIE Hair & Beauty Limited | Other services | 2025 |
| Fleur Hill LLP | | 2021 |
| Fleur Hill Number 1 LLP | | 2006 |
| Fleximore Limited | Extraterritorial | 2007 |
| Flimby Pizzeria Limited | Hospitality | 2025 |
| Flip Graphics Ltd | Professional & scientific | 2010 |
| Flipia Ltd | Construction | 2024 |
| Flomedical Ltd | Health & social care | 2024 |
| Floral Fantasy London Ltd | Wholesale & retail | 2025 |
| Flow Free Drainage Limited | Administrative & support | 2006 |
| Flow Free Mechanical Services Limited | Water & waste | 2018 |
| Flow Free Services Limited | Administrative & support | 2018 |
| FLY by Travel Holidays Ltd | Administrative & support | 2020 |
| FMB91 Ltd | Transport & logistics | 2024 |
| Fmuk Finance Ltd | Professional & scientific | 2024 |
| Foley & Co. Holdings Ltd | Real estate | 2025 |
| Food From Italy Limited | Hospitality | 2024 |
| Food Joy Wise Consulting Limited | Other services | 2023 |
| Food Morning Ltd | Wholesale & retail | 2022 |
| Foodcon Ltd | Hospitality | 2025 |
| Ford END Farm Ltd | Agriculture & fishing | 2019 |
| Forest Car Company Ltd | Wholesale & retail | 2022 |
| Forfar Hot Food Limited | Hospitality | 2017 |
| Forgione Pasha Catering Limited | Hospitality | 2025 |
| Format Design Studio Limited | Professional & scientific | 2006 |
| Formline Studio Ltd | Professional & scientific | 2025 |
| Formula Air Racing Limited | Extraterritorial | 1989 |
| Fortitude Wealth Ltd | Health & social care | 2013 |
| Forty Hill Plant Displays Ltd | Wholesale & retail | 2019 |
| Fourgen Lettings Limited | Real estate | 2026 |
| Fourgen Limited | Real estate | 2026 |
| Fourgen Properties Limited | Real estate | 2026 |
| Fourways Nursery Ltd | Agriculture & fishing | 2011 |
| Fragolah Limited | Hospitality | 2024 |
| Frankie the Videographer Limited | Information & communication | 2021 |
| Frca Exams Limited | Education | 2013 |
| FRD Properties Limited | Real estate | 2018 |
| Fred's Glass Ltd | Construction | 2023 |
| Fredereck Sage Co Ltd. | Construction | 1996 |
| Fredereck Sage Holdings Limited | Financial services | 2016 |
| Fredereck Sage Property Management Ltd | Households | 2007 |
| Freefall Ltd | Information & communication | 2025 |
| Freshco Savouries Limited | Wholesale & retail | 2013 |
| Freshcraft Limited | Extraterritorial | 1981 |
| Friends Media Limited | Information & communication | 2020 |
| Frontline Protection Ltd | Administrative & support | 2026 |
| FS Property Group Ltd | Real estate | 2020 |
| FS Services Group Ltd | Administrative & support | 2016 |
| FU Civil Construction Limited | Construction | 2021 |
| Full Moon Gaming Ltd | Wholesale & retail | 2025 |
| Functional Aesthetics Intelligence Ltd | Health & social care | 2026 |
| Funiily Limited | Arts & recreation | 2025 |
| Furious Goose Limited | Wholesale & retail | 2015 |
| Fuse Fire Services Ltd | Professional & scientific | 2026 |
| Fusion Walthamx Ltd | Hospitality | 2019 |