| Fang Health and Beauty Ltd | Other services | 2024 |
| Fantastic Sams Cleaning Services Ltd | Administrative & support | 2026 |
| Farmwood Mechanical & Electrical Services Limited | Professional & scientific | 2002 |
| Farrah Fowler Property Limited | Real estate | 2020 |
| Fast Track Development Limited | Education | 2015 |
| Father's Love Limited | Other services | 2014 |
| Faur Services Ltd | Transport & logistics | 2019 |
| Faversham Brewery Management Limited | Households | 2011 |
| Faversham Construction Services Limited | Construction | 2004 |
| FBM Scrap Metals Ltd | Wholesale & retail | 2025 |
| FCI Services NG Limited | Professional & scientific | 2024 |
| Fcma Ltd | Professional & scientific | 2022 |
| Fcsb Trans Ltd | Transport & logistics | 2025 |
| Feakes Gordon Squash Rackets Limited | Arts & recreation | 1975 |
| Fedibey Ltd | Financial services | 2025 |
| Feekings Electrical Ltd | Construction | 2025 |
| Felix Partners Ltd | Professional & scientific | 2026 |
| Fenoulhet Way Management Company Limited | Households | 2007 |
| Fenrose Limited | Construction | 1991 |
| Fenrose Waste Management Limited | Water & waste | 2023 |
| Ferdiella Group Limited | Health & social care | 2024 |
| Fern Medical Limited | Real estate | 2020 |
| Fern Valley Care Services Ltd | Health & social care | 2022 |
| Ferris Fisheries Ltd | Agriculture & fishing | 2025 |
| FES Health Ltd | Professional & scientific | 2023 |
| FGA Farming Limited | Administrative & support | 2020 |
| Fidelity (Europe) Limited | Construction | 1992 |
| Fiit Box Ltd | Arts & recreation | 2018 |
| Filtra-Solve Technologies UK Limited | Manufacturing | 2023 |
| Finbell Limited | Health & social care | 2009 |
| Find ME Recruitment Ltd | Administrative & support | 2018 |
| Finity Care Ltd | Health & social care | 2024 |
| Fire & Mist Protection UK Limited | Public administration | 2025 |
| Fire Inhibitors and Home Safety Limited | Administrative & support | 2021 |
| Fire-Tech Systems Limited | Construction | 2017 |
| Firm Foundations Property Services Limited | Real estate | 2006 |
| First Choice Hair & Beauty Limited | Wholesale & retail | 2004 |
| First Fabrications Limited | Manufacturing | 1995 |
| First FIX Electrics Kent Limited | Construction | 2016 |
| First Investment Properties Ltd | Real estate | 2018 |
| First Partnership Properties LLP | | 2005 |
| First Solution Healthcare Ltd | Administrative & support | 2023 |
| Fitshifter Ltd | Information & communication | 2025 |
| Fitster Limited | Other services | 2016 |
| Five Limited | Administrative & support | 2000 |
| Five Stars Cleaning Ltd | Construction | 2024 |
| FIVE:14 Healthcare Services Limited | Health & social care | 2023 |
| FIVE:14 Social Work Services Ltd | Health & social care | 2019 |
| FJ Haven Property Management Ltd | Real estate | 2025 |
| Fkdk Limited | Transport & logistics | 2026 |
| Flair Construction Group Ltd | Financial services | 2016 |
| Flair Construction Ltd | Construction | 2020 |
| Flamingo Life Limited | Administrative & support | 2016 |
| Flanders Plumbing and GAS Ltd | Construction | 2025 |
| Fleetwood Transport Limited | Manufacturing | 2010 |
| Fleming Care Homes Limited | Health & social care | 2006 |
| Fleual Limited | Real estate | 1977 |
| Flexible Futures HR Limited | Professional & scientific | 1995 |
| Flexible LAB Solutions Limited | Professional & scientific | 2011 |
| Floglojo Limited | Administrative & support | 2017 |
| Floplast Limited | Manufacturing | 1991 |
| Florence Motors Limited | Wholesale & retail | 2024 |
| FLOURISH1LIFE Ltd | Health & social care | 2020 |
| Flowers by Beatrice (Sittingbourne) Limited | Wholesale & retail | 2019 |
| Flowers Creations Ltd | Wholesale & retail | 2023 |
| Fluecube Europe LLP | | 2011 |
| Fluecube Ltd | Wholesale & retail | 2021 |
| Fluff Designer Ltd | Professional & scientific | 2026 |
| Fluid Control Fabrications Limited | Manufacturing | 2002 |
| Flyghers Care Limited | Health & social care | 2023 |
| Flyghers Educational Services Limited | Education | 2021 |
| FMM Consulting Ltd | Information & communication | 2005 |
| FN Design Cleaning Ltd Limited | Administrative & support | 2025 |
| Foal Play Limited | Arts & recreation | 2026 |
| Foam Studio Limited | Administrative & support | 2009 |
| Folars Ltd | Health & social care | 2022 |
| Fonel Global Investment Limited | Wholesale & retail | 2025 |
| Fonel Investment Ltd | Hospitality | 2024 |
| Foordside Mechanical Limited | Construction | 2014 |
| Fopord Services Limited | Health & social care | 2023 |
| Foran Land Limited | Extraterritorial | 2013 |
| Force 1402 Ltd | Construction | 2025 |
| Foreland Properties Limited | Administrative & support | 2019 |
| Foretias ROB Ltd | Wholesale & retail | 2023 |
| Forever Hair & Beauty Ltd | Extraterritorial | 2019 |
| Forge Property and Developments Ltd | Real estate | 2019 |
| Forge Rentals Ltd | Real estate | 2025 |
| Formulation Excellence Research & Technology Limited | Manufacturing | 2022 |
| Forshaw Consultancy Ltd | Health & social care | 2024 |
| Forteh Limited | Real estate | 2022 |
| Fortified D'S Ltd | Real estate | 2023 |
| Fosbraey Builders (Kent) Limited | Construction | 2015 |
| Four Quarters (College Lane) Limited | Construction | 1999 |
| Four Quarters (Holdings) Limited | Construction | 2012 |
| Four Quarters (Kentish Town) Limited | Financial services | 2013 |
| Four Quarters (Studio Site) Limited | Construction | 2013 |
| Four Quarters Construction Limited | Construction | 2013 |
| Four Quarters Developments Limited | Construction | 2017 |
| Four Seasons Electrical & Building Ltd | Construction | 2011 |
| Foxbury Construction Limited | Construction | 1988 |