| Fennell Investments 2 Limited | Other services | 2020 |
| Fenners Carpentry, Construction & Building Maintenance Ltd | Construction | 2005 |
| Fernfield Homes Limited | Construction | 2013 |
| Feros Ferio Limited | Wholesale & retail | 2015 |
| Ferris Installations Limited | Construction | 2020 |
| Ferry Mews Management Company Limited | Households | 2003 |
| Fetechnologies Ltd | Professional & scientific | 2023 |
| Feynovate Technologies Ltd | Information & communication | 2026 |
| FFH Bapchild Ltd | Construction | 2016 |
| FFH Braintree Ltd | Construction | 2018 |
| FFH HF Ltd | Construction | 2017 |
| FFH HSF Ltd | Construction | 2022 |
| FFH SK Ltd | Construction | 2020 |
| FFH Stodmarsh Road Ltd | Construction | 2022 |
| FG Haulage Ltd | Transport & logistics | 2017 |
| FHA Logistics Limited | Transport & logistics | 2026 |
| FHC Care Limited | Health & social care | 2025 |
| Fiali Consulting Limited | Information & communication | 2025 |
| Fibonacci Digital Limited | Wholesale & retail | 2025 |
| Fidec Limited | Administrative & support | 2012 |
| Fidelity Global Relocation Ltd | Real estate | 2021 |
| Fidelity Repairs Ltd | Other services | 2019 |
| FIG Consultants Limited | Extraterritorial | 2008 |
| Fight Flames (UK) Ltd | Construction | 2021 |
| Figurehouse Private Estates Ltd | Real estate | 2025 |
| Figures Please Ltd | Professional & scientific | 2011 |
| Fincham UK Contracts Ltd | Construction | 2018 |
| Findwise Ltd | Financial services | 2025 |
| Fine Food Consultancy Ltd | Hospitality | 2018 |
| Finebuild Limited | Administrative & support | 2017 |
| Finest HOO Fish Limited | Hospitality | 2016 |
| Fink Bayonne Brothers Ventures Limited | Other services | 2013 |
| Finlayson Commercial Services Ltd | Administrative & support | 2024 |
| FIO Holdings Limited | Real estate | 2026 |
| Fiona's Kitchen Ltd | Hospitality | 2022 |
| Fire Action Compliance & Safety Ltd | Public administration | 2026 |
| Fire and Acoustic Services Ltd | Construction | 2021 |
| Fire and Acoustic Supplies Limited | Construction | 2002 |
| Fire Detection and Protection Systems Ltd | Administrative & support | 2013 |
| Fire Door Logistics Ltd | Households | 2025 |
| Fire Firm Ltd | Construction | 2022 |
| Fire Protection Management Ltd | Construction | 2025 |
| Firestop International Ltd | Professional & scientific | 2023 |
| Firmiana Investments Ltd | Real estate | 2024 |
| First Choice Flooring Ltd | Construction | 2017 |
| First Choice Plumbers Limited | Construction | 2025 |
| First Class Learning Gillingham South Ltd | Education | 2023 |
| First Intervention Training (F.I.T.) Limited | Administrative & support | 1999 |
| First Marine Group Ltd | Transport & logistics | 2026 |
| First Property Developments Ltd | Real estate | 2011 |
| First Site Office & Design Ltd | Administrative & support | 2025 |
| First Site Surveying Limited | Construction | 2001 |
| Firstcap Investments Limited | Real estate | 2013 |
| Firstfruits Environmental Services C.I.C. | Agriculture & fishing | 2021 |
| Firststep Business and Consulting Limited | Information & communication | 2012 |
| Fisherman's Wharf Whitstable Limited | Real estate | 2005 |
| Fit Risk Management Ltd | Extraterritorial | 2011 |
| Fit Workforce Solutions Limited | Other services | 2026 |
| Fitness Professionals Limited | Arts & recreation | 1990 |
| Fitpro Limited | Extraterritorial | 2004 |
| Fitzrovia Light and Sound Ltd | Manufacturing | 2026 |
| Five Bells Lane Management Limited | Professional & scientific | 1989 |
| Five O Investments Ltd | Financial services | 2023 |
| Five SIX Finance Limited | Financial services | 2023 |
| Fiveway Building Services Limited | Construction | 1989 |
| Fizza Trading Limited | Wholesale & retail | 2020 |
| FJ Cost Consultants Ltd | Professional & scientific | 2026 |
| FK Cars Ltd | Transport & logistics | 2024 |
| Flame CUT Blanks Ltd | Administrative & support | 2018 |
| Flame Flow Services Ltd | Professional & scientific | 2023 |
| Flamers Pizza Ltd | Hospitality | 2010 |
| Flamingo Properties Kent Ltd | Real estate | 2019 |
| Flash Mobile Tyre Service Limited | Wholesale & retail | 2024 |
| Flat OUT Football Ltd | Arts & recreation | 2025 |
| Flatbed Network Limited | Professional & scientific | 2002 |
| Flavours of Spain Brockley Limited | Hospitality | 2018 |
| Flavours of Spain Limited | Hospitality | 2005 |
| Flawless Floors Kent Ltd | Construction | 2026 |
| Fleet Disposals Ltd | Wholesale & retail | 2019 |
| Fleet Engineering Ltd | Wholesale & retail | 2017 |
| Fleet House Investments Limited | Real estate | 2016 |
| Fleet Luxury Packaging Limited | Extraterritorial | 2014 |
| Fleet Luxury Print Limited | Manufacturing | 2017 |
| Fleet Luxury Print Solutions Ltd | Manufacturing | 2019 |
| Fleet Retail Group Limited | Professional & scientific | 2008 |
| Fleet Retail Packaging Ltd. | Manufacturing | 2004 |
| Fleetaro Ltd | Information & communication | 2026 |
| Fleur DE LIS Classical Theatre Company Ltd | Arts & recreation | 2021 |
| Flicie Ltd | Wholesale & retail | 2020 |
| Flix Consulting Ltd | Information & communication | 2021 |
| Flochi Property Services Ltd | Real estate | 2014 |
| Flogimad Properties Ltd | Real estate | 2024 |
| Flomerg Ltd | Manufacturing | 2011 |
| Flomotion Engineering Ltd | Professional & scientific | 2025 |
| Flood Media Limited | Information & communication | 2003 |
| Floorco. Ltd | Construction | 2020 |
| Floorfast Ltd | Construction | 2023 |
| Flooring and Carpet Experts Limited | Construction | 2026 |
| Flooringempire.Ltd Limited | Construction | 2025 |
| Flora & Fauna Ltd | Information & communication | 2013 |