| Fenttiman Capital Limited | Real estate | 2022 |
| Fenttiman Limited | Real estate | 2013 |
| Fenttiman Properties London Limited | Real estate | 2022 |
| Fenttiman Properties Ltd | Real estate | 2022 |
| Fenventures Ltd | Hospitality | 2025 |
| Fenviews Ltd | Financial services | 2017 |
| Fenvino Ventures Limited | Financial services | 2022 |
| Fenwell UK Ltd. | Wholesale & retail | 2024 |
| Fercy Personal Care Products Co., Limited | Manufacturing | 2019 |
| Ferly Furniture Co., Ltd | Wholesale & retail | 2024 |
| Ferment Foods Ltd | Manufacturing | 2023 |
| Ferndale Court Management (Cambridge) Limited | Households | 2010 |
| Ferndale Web Ltd | Information & communication | 2025 |
| Ferngrove Ltd | Administrative & support | 2026 |
| Ferrandino Limited | Professional & scientific | 2020 |
| Ferranti Electric Group Co, Ltd | Manufacturing | 2021 |
| Ferraro Jewellers Ltd | Manufacturing | 2025 |
| Ferratrix Ltd | Manufacturing | 2026 |
| Ferring Marine Residents Association Limited(The) | Real estate | 1968 |
| Ferry Cross Limited | Financial services | 2015 |
| Ferry Path Education Ltd | Education | 2024 |
| Fertile Globe Limited | Manufacturing | 2024 |
| Fertility & Reproductive Health Consultancy Services Ltd | Professional & scientific | 2017 |
| Fetal.Ai Ltd | Professional & scientific | 2025 |
| FEW Construction and Carpentry Limited | Construction | 2019 |
| Fews Lane Consortium Ltd | Other services | 2018 |
| Ffei Limited | Manufacturing | 1996 |
| FFF Aiden Curuk Limited | Arts & recreation | 2025 |
| FFF Head Office Community LLP | | 2025 |
| Fgdc Limited | Information & communication | 2015 |
| FGS Corporation Limited | Financial services | 2020 |
| Fgsg Technology Limited | Information & communication | 2025 |
| FHH Enterprise Holding Ltd | Financial services | 2025 |
| Fiber Packaging Co., Ltd | Extraterritorial | 2018 |
| Fibrenex Communications Limited | Information & communication | 1995 |
| Fibrewave Networks Limited | Information & communication | 2011 |
| Fico by Betty Ltd | Hospitality | 2020 |
| Fidelium Financial Planners Limited | Financial services | 2015 |
| Fidelium Limited | Financial services | 2017 |
| Fidesign Studio Ltd | Professional & scientific | 2019 |
| Fidion EOT Limited | Professional & scientific | 2025 |
| Fidion Limited | Financial services | 2016 |
| Field Craft Maintenance Limited | Professional & scientific | 2025 |
| Field END (Balsham) Management Company Limited | Real estate | 1997 |
| Field House Renewables Limited | Energy | 2021 |
| Field Intelligence Ltd | Information & communication | 2022 |
| Field Notes Architects Limited | Professional & scientific | 2015 |
| Field Options Limited | Agriculture & fishing | 2004 |
| Field Road Kingham Limited | Real estate | 2022 |
| Field Technical Ltd | Manufacturing | 2017 |
| Field Textiles Limited | Wholesale & retail | 1998 |
| Field View Court Management Company 2023 Limited | Households | 2023 |
| Fieldcare Limited | Agriculture & fishing | 1973 |
| Fiera Oncology Limited | Professional & scientific | 2025 |
| Fife Oncology Consulting Limited | Health & social care | 2017 |
| Fife Power 1 Limited | Manufacturing | 2021 |
| Fifi One Limited | Health & social care | 2017 |
| Fifth Field Ltd | Agriculture & fishing | 2026 |
| Fifth View Ltd | Real estate | 2024 |
| FIG Therapeutics Limited | Professional & scientific | 2024 |
| Fighter Collection Limited (the) | Arts & recreation | 1985 |
| Fignum Limited | Information & communication | 2019 |
| Figs in Wigs (2022) Ltd | Arts & recreation | 2022 |
| Figueiredo Ltd | Manufacturing | 2026 |
| Filcris Limited | Manufacturing | 1990 |
| Filipe Amante Limited | Professional & scientific | 2019 |
| Filizce Ltd | Hospitality | 2026 |
| Fill Skills Gaps Digital Security CIC | Information & communication | 2025 |
| Filpharma Limited | Professional & scientific | 2025 |
| Fimbo Fitness UK Ltd | Arts & recreation | 2026 |
| FIN Boys Ltd | Hospitality | 2020 |
| FIN Capital Limited | Real estate | 2007 |
| FIN Corporate Services Limited | Professional & scientific | 2011 |
| Final Finishes Limited | Construction | 2015 |
| Finance Check Ltd | Extraterritorial | 2022 |
| Finance Systems Delivery Solutions Ltd | Information & communication | 2016 |
| Financial Flair Limited | Professional & scientific | 2024 |
| Financial Futures CIC | Education | 2026 |
| Financial Innovation Commons Limited | Financial services | 2020 |
| Financial Innovation for Impact | Education | 2023 |
| Finano Limited | Professional & scientific | 2013 |
| Finbow & Sons Limited | Administrative & support | 1961 |
| Finchams Close Limited | Real estate | 1969 |
| Fincrime Dynamics Ltd | Information & communication | 2019 |
| Find an ACT Ltd | Arts & recreation | 2019 |
| Find Trade Ltd | Wholesale & retail | 2025 |
| Find Your Tribe Limited | Other services | 2024 |
| Findent Solutions Limited | Professional & scientific | 2003 |
| Findhorizon Limited | Information & communication | 2024 |
| Finding OUR Feet CIC | Other services | 2024 |
| Fine Aesthetic Medicine Clinic Ltd | Health & social care | 2025 |
| Fine Maid Ltd | Administrative & support | 2024 |
| Fingers Inc Ltd | Construction | 2012 |
| Finkele Ltd | Information & communication | 2025 |
| Finland Aifuman Agriculture Technology Ltd | Mining & quarrying | 2026 |
| Finland Hayrick Technology Group Limited | Extraterritorial | 2023 |
| Finland Meikaifeng International Chemical Co., Ltd | Wholesale & retail | 2023 |
| Finland Ugemalan Chemical Special Fertilizer Co., Ltd. | Wholesale & retail | 2024 |
| Finland Xingyuwang Agricultural Group Co., Ltd | Wholesale & retail | 2024 |
| Finland Yaran Biotechnology International Co., Ltd | Wholesale & retail | 2025 |