| Fiander Tovell (CR) Limited | Financial services | 2017 |
| Fibc Service Center UK Ltd | Administrative & support | 2023 |
| Fibretech Profusion Ltd | Construction | 2006 |
| Fida Company Ltd | Wholesale & retail | 2025 |
| Fidgens Ltd | Professional & scientific | 2004 |
| Fieldcross Engineering Limited | Information & communication | 2000 |
| Fieraru Executive Cars Ltd | Transport & logistics | 2026 |
| Fifth Avenue Limited | Real estate | 2016 |
| Fifty One North Limited | Information & communication | 2013 |
| Fiftyfive Ventures Limited | Construction | 2018 |
| Fight Yourself Fit Limited | Information & communication | 2014 |
| Filmer & Co Business Services Ltd | Professional & scientific | 2025 |
| Filmer Trading Ltd | Hospitality | 2013 |
| Fimg ( Football Industries Management Group) Limited | Professional & scientific | 2025 |
| Finance and Management in Education Ltd | Professional & scientific | 2017 |
| Finance Projekt Ltd | Information & communication | 2012 |
| Financial Office Support Ltd | Financial services | 2015 |
| Financial Trouble Shooter Ltd | Financial services | 2024 |
| Finbas Limited | Construction | 2023 |
| Finbri Limited | Financial services | 2020 |
| Find Yourspace Limited | Real estate | 2023 |
| Findafault Ltd | Wholesale & retail | 2020 |
| Findifox Ltd | Information & communication | 2020 |
| Fine & Country Limited | Professional & scientific | 2001 |
| Fine Design Homes Limited | Construction | 2024 |
| Fine Homes Southern Limited | Real estate | 2021 |
| Fineheat Plumbing and Heating Limited | Construction | 2019 |
| Finest Smile Ltd | Health & social care | 2008 |
| Finestam LOG Cabins Ltd | Other services | 2013 |
| Finezzeuk Ltd | Wholesale & retail | 2024 |
| Fingo Piri Piri Ltd | Hospitality | 2024 |
| Finishing Touch Cleaning Services Ltd | Administrative & support | 2015 |
| Finlay Investments (Wessex) Ltd | Construction | 2024 |
| Finova Auralis Ltd | Information & communication | 2025 |
| Finura Marketing Limited | Professional & scientific | 2023 |
| Fiona Jane Designs Ltd | Professional & scientific | 2020 |
| Fiore Bottega Limited | Wholesale & retail | 2026 |
| Firbank Freehold Limited | Households | 2004 |
| Firbank Properties Ltd | Real estate | 2022 |
| Fire Dove Films Ltd | Information & communication | 2016 |
| Firefly Literature Limited | Information & communication | 2019 |
| Fireplace Story Limited | Education | 2020 |
| Fireside Digital Ltd | Information & communication | 2026 |
| Fireworx Ice Limited | Professional & scientific | 2016 |
| Firs Glen Fabrications Limited | Manufacturing | 2014 |
| First 4 U Recruitment Ltd | Administrative & support | 2023 |
| First Capital Finance Limited | Financial services | 2000 |
| First Capital Leasing Limited | Financial services | 2003 |
| First Century Holdings Limited | Extraterritorial | 2023 |
| First Choice Drains Ltd | Water & waste | 2026 |
| First Choice Motor Services Ltd | Wholesale & retail | 2023 |
| First Choice PPF Ltd | Extraterritorial | 2021 |
| First Choice Training Company Limited | Extraterritorial | 2002 |
| First Direct Accounting Ltd | Administrative & support | 2009 |
| First FIX Drain Services Ltd | Construction | 2025 |
| First Magnolia Holdings Limited | Administrative & support | 2021 |
| First Maintenance Ltd | Construction | 2024 |
| First Rate Property Maintenance Ltd | Construction | 2025 |
| FIRST4PROPERTY Services Limited | Construction | 2021 |
| Firstlight Productions Ltd | Professional & scientific | 2021 |
| Firstmagic Limited | Hospitality | 2000 |
| FIS Electrical Ltd | Construction | 2023 |
| Fiscal Financial Planning Limited | Financial services | 2016 |
| Fischer Technik (Industrial) Ltd | | 1981 |
| Fisher Family Homes Limited | Real estate | 2022 |
| Fisherlicious Limited | Hospitality | 2023 |
| Fisherman's Vista Limited | Households | 2007 |
| Fit for a Princess Boutique Ltd | Wholesale & retail | 2025 |
| FIT40 Health & Lifestyle Ltd | Wholesale & retail | 2025 |
| Fitforlifechiro Limited | Health & social care | 2004 |
| Fitter Than Fit Limited | Arts & recreation | 2013 |
| Fitzroy Computer Systems Limited | Real estate | 1972 |
| Five Point Homes Ltd | Real estate | 2025 |
| Five Point Living Ltd | Real estate | 2022 |
| Five Spice Catering Poole Ltd | Hospitality | 2023 |
| Five Star Removals and Clearances Ltd | Water & waste | 2025 |
| Five Talents Financial Planning Limited | Financial services | 2021 |
| Five Vectors Ltd | Wholesale & retail | 2023 |
| Fives Farm Ltd | Agriculture & fishing | 2020 |
| FIX FOX Ltd | Other services | 2016 |
| FIX IT Home Improvements Ltd | Construction | 2026 |
| Fixithomecare Limited | Other services | 2018 |
| FJB Hotels Limited | Financial services | 2015 |
| FJL Interiors Ltd | Construction | 2022 |
| FK Trade & Co Ltd | Wholesale & retail | 2017 |
| Flagship Recruitment Ltd | Professional & scientific | 2018 |
| Flaithulach Limited | Wholesale & retail | 2009 |
| Flamelily Environmental Limited | Professional & scientific | 2017 |
| Flash Properties Management Limited | Households | 2011 |
| Flashdrive South Limited | Wholesale & retail | 2018 |
| Flat Roof Management Ltd | Construction | 2018 |
| Flatearth Computing Limited | Information & communication | 2002 |
| Flatiques Ltd | Manufacturing | 2025 |
| Flawless Accounting Limited | Professional & scientific | 2024 |
| Fleming IT Services Limited | Information & communication | 2016 |
| Fletchurst Management Limited | Households | 1991 |
| Flex Academy Limited | Education | 2014 |
| Flexer & Sandiland C.I.C. | Administrative & support | 2007 |
| Flexiestays Ltd | Real estate | 2023 |
| Flint Land Advisory Limited | Administrative & support | 2026 |