| Farsa Engineering Services Ltd | Construction | 2014 |
| Farshori Metals Ltd | Wholesale & retail | 2002 |
| Fashionjayuk Ltd | Wholesale & retail | 2025 |
| Fast Growth Consulting Limited | Administrative & support | 2019 |
| Fataaha Ltd | Households | 2026 |
| Favekol Ltd | Professional & scientific | 2022 |
| FCL3 Ltd | Professional & scientific | 2022 |
| FCL5 Limited | Health & social care | 2025 |
| FDL Rail and Special Projects Limited | Construction | 2009 |
| Fenix EUR Ltd | Professional & scientific | 2016 |
| FERHAT66 Ltd | Hospitality | 2025 |
| Fetii Clothing Ltd | Wholesale & retail | 2025 |
| FF Builders Ltd | Construction | 2023 |
| Fifteen 04 Limited | Other services | 2022 |
| Find Materials Ltd | Wholesale & retail | 2023 |
| Findatherapist.Co.Uk Ltd | Information & communication | 2007 |
| Findaway Limited | Wholesale & retail | 2005 |
| Fine Lands Ltd | Real estate | 2022 |
| Finest Consultants Ltd | Information & communication | 2021 |
| Fintan Solutions Limited | Information & communication | 2005 |
| Fircroft Services Limited | Health & social care | 1986 |
| Firewerse Ltd | Administrative & support | 2025 |
| First Call Protection Ltd | Transport & logistics | 2025 |
| First Cyte Ltd | Information & communication | 2025 |
| Firstaideasy Ltd | Construction | 2017 |
| Fisher Financial Advisors Ltd | Financial services | 2015 |
| Fit Cook Ltd | Other services | 2020 |
| Five River Ashford Limited | Arts & recreation | 2019 |
| Five River Dover Limited | Arts & recreation | 2019 |
| Five River Group Limited | Arts & recreation | 2017 |
| Five River Warminster Ltd | Arts & recreation | 2021 |
| FIX UP Enterprise Ltd | Health & social care | 2011 |
| FJ Associates Ltd | Professional & scientific | 2024 |
| Flame One Limited | Real estate | 2024 |
| Flamegen AI Ltd | Information & communication | 2025 |
| Flawless Flooring Services Limited | Construction | 2007 |
| Fleet Healthcare Limited | Extraterritorial | 2025 |
| Flex Driving Academy Ltd | Other services | 2021 |
| Flexy Retail Ltd | Wholesale & retail | 2021 |
| Flintham Holdings Limited | Financial services | 2023 |
| Flintham Homes Limited | Real estate | 2023 |
| Flooring Website Limited | Construction | 2020 |
| Flushed Away Ltd | Construction | 2020 |
| Flux Data Solutions Limited | Information & communication | 2021 |
| FLY the Flag Limited | Professional & scientific | 1993 |
| FMA Foods Ltd | Wholesale & retail | 2024 |
| FMP Property Limited | Real estate | 2020 |
| FMR Holdings Limited | Financial services | 2019 |
| FMR Property Limited | Real estate | 2021 |
| Focus Trading Ltd | Wholesale & retail | 2023 |
| Fonofire Media Limited | Arts & recreation | 2021 |
| Football 567 Ltd | Arts & recreation | 2011 |
| Football FUN Factory (Community 133) Limited | Arts & recreation | 2024 |
| Forbury Consultants Limited | Professional & scientific | 2017 |
| Foresters Wholesale Limited | Wholesale & retail | 2026 |
| Forge Lane Management Company Limited | Other services | 1991 |
| Forgesite Supplies Ltd | Wholesale & retail | 2025 |
| Forza Technology Limited | Information & communication | 2026 |
| Foteino Services Limited | Real estate | 2024 |
| Foundation Developments Limited | Construction | 1990 |
| Fountain Green Ltd | Hospitality | 2024 |
| Foxley Court Lessees Limited | Real estate | 1967 |
| FP Home Improvements Ltd | Construction | 2026 |
| Francombe Group Ltd | Administrative & support | 2024 |
| Fransan Island Ltd | Real estate | 2024 |
| Fred Design Limited | Professional & scientific | 2011 |
| Freddie & SON Building Services Ltd | Construction | 2016 |
| Fremont Property Limited | Households | 2025 |
| Fresco Gelato Ltd | Hospitality | 2018 |
| Fresco Ltd | Hospitality | 2026 |
| Fresco WP Ltd | Hospitality | 2022 |
| Fresh Bread Media Limited | Information & communication | 2013 |
| Fresh Skin Ltd | Health & social care | 2018 |
| Freshwood Residents (Freehold) Company Limited | Households | 2003 |
| FRG Belfast Ltd | Arts & recreation | 2025 |
| FRG Hammersmith Ltd | Arts & recreation | 2026 |
| FRG London Ltd | Arts & recreation | 2025 |
| Front Footwear Ltd | Wholesale & retail | 2020 |
| Fulcrum Care Limited | Health & social care | 2017 |
| Fulcrum Care Management Ltd | Health & social care | 2022 |
| Fulfillment Express Limited | Administrative & support | 2000 |
| Fullon Creative Ltd | Information & communication | 2019 |
| Funcon Limited | Administrative & support | 2020 |
| Funson Limited | Other services | 2020 |
| Furniture for Schools Limited | Education | 2003 |
| Fuse Fitness Services Ltd | Arts & recreation | 2018 |
| Futurewise Accountancy Limited | Professional & scientific | 2015 |
| Futurewise Finance Ltd | Administrative & support | 2020 |
| Futurewise International Ltd | Information & communication | 2017 |
| FVP Investments Limited | Real estate | 2020 |
| G K Energy Analysis Limited | Other services | 2002 |
| G L H Electrical & Building Services Ltd | Construction | 2018 |
| G. Rentocchini Limited | Professional & scientific | 2021 |
| G.A.P Accountancy Services Limited | Professional & scientific | 2002 |
| G.P.T. Consultants Limited | Professional & scientific | 2022 |
| Gabcon Ltd | Professional & scientific | 2025 |
| Gabriels Consulting Limited | Information & communication | 2015 |
| Gaimcontrol Ltd | Information & communication | 2024 |
| GAJ Solutions Ltd | Professional & scientific | 2022 |
| Galham Services Ltd | Administrative & support | 2022 |