| First Choice Commercial Plant & Machinery Ltd | Wholesale & retail | 2022 |
| First Class Accounting Limited | Professional & scientific | 2011 |
| First Select Roofing & Building Limited | Construction | 2019 |
| Fish & Flips Ltd | Real estate | 2026 |
| Fishpalace Limited | Real estate | 2013 |
| Fisics Trading Company Limited | Wholesale & retail | 2012 |
| Fit-Out Dynamics Ltd | Construction | 2024 |
| Fitbusters Limited | Education | 2025 |
| Fitz-Henry HR Ltd | Administrative & support | 2018 |
| FJC Roofing Ltd | Construction | 2022 |
| Fjmk Medics Ltd | Health & social care | 2022 |
| FL Construction Services Ltd | Construction | 2022 |
| Flash Pizoni Ltd | Administrative & support | 2025 |
| Flashfix Ltd | Construction | 2025 |
| Flaxten Cards Limited | Wholesale & retail | 2006 |
| Flcn Shop Ltd | Manufacturing | 2023 |
| Fleek Angel Academy Ltd | Education | 2021 |
| Fleek Angel Limited | Other services | 2019 |
| Fleet of Foot Limited | Health & social care | 2020 |
| Fleetheat UK Ltd | Manufacturing | 2011 |
| Fletcher Fern Ltd | Real estate | 2022 |
| Florens People Consulting Ltd | Professional & scientific | 2021 |
| Flow Construction Services Ltd | Construction | 2022 |
| FLY About Aviation Limited | Wholesale & retail | 2012 |
| Flying Grayson Rigging Ltd | Construction | 2018 |
| FM Cleaning Services Limited | Administrative & support | 2012 |
| Fons Vitae Ltd | Construction | 2023 |
| Forest Carpentry & Joinery Limited | Construction | 2005 |
| Forest Trucking (UK) Limited | Transport & logistics | 1994 |
| Forever 39 Limited | Professional & scientific | 2024 |
| Forever Connected Ltd | Health & social care | 2021 |
| Forever Faces Ltd | Other services | 2023 |
| Forlex Fire Protection Limited | Construction | 2011 |
| Forma Law Limited | Administrative & support | 2020 |
| Fosters Electrics Ltd | Construction | 2021 |
| Fountain Trading Limited | Professional & scientific | 2006 |
| Fourth World Solutions Ltd | Information & communication | 2019 |
| FOX Accountancy Limited | Professional & scientific | 2003 |
| FOX Real Estate Consulting Limited | Real estate | 2024 |
| Foxwood Manor Estates Ltd | Real estate | 2025 |
| FP Building Ltd | Construction | 2015 |
| Francisca Services Limited | Real estate | 2020 |
| Frank Metals Ltd | Wholesale & retail | 2026 |
| French Parquet Ltd | Construction | 2012 |
| Fresh X Sales Ltd | Wholesale & retail | 2025 |
| Frontier Healthcare Ltd | Administrative & support | 2012 |
| Frost Solutions (UK) Limited | Information & communication | 2012 |
| FS Contracting Building Services Ltd | Construction | 2013 |
| Fuse.Gold Limited | Financial services | 2021 |
| Fusion Taste/ the Indian Box Ltd | Hospitality | 2019 |
| G & M Building Contractors Essex Ltd | Construction | 2009 |
| G S Kang Investment Ltd | Real estate | 2018 |
| G&A Civils Ltd | Construction | 2024 |
| G&A Spares and Repairs Ltd | Administrative & support | 2017 |
| G.D.F. Controls Limited | Information & communication | 2002 |
| G2S Consultancy Limited | Professional & scientific | 2016 |
| Gadgets Clinic Ltd | Wholesale & retail | 2022 |
| Gadgets Outlet Ltd | Other services | 2019 |
| Gadgets Service Ltd | Other services | 2021 |
| Gadgets Solution Limited | Manufacturing | 2016 |
| Galaxy Property Management Services Ltd | Real estate | 2026 |
| Gallinarius Holdings | Financial services | 2025 |
| Garage 42 Ltd | Real estate | 2024 |
| Gaynes Capital Limited | Other services | 2025 |
| GB Carbon Neutral Forest UK Limited | Agriculture & fishing | 2025 |
| GB Global Management Limited | Financial services | 1988 |
| Generation Darts Ltd | Education | 2025 |
| Genome Marketing Limited | Professional & scientific | 2010 |
| Germinabunt Limited | Real estate | 2020 |
| Ggpt Ltd | Other services | 2022 |
| GHM Enterprises Ltd | Wholesale & retail | 2024 |
| Ghumman Services Ltd | Administrative & support | 2022 |
| Gidi Consulting Limited | Construction | 2025 |
| Gidley Building Contractors Ltd | Construction | 2013 |
| Giggle Garden Play Cafe Ltd | Hospitality | 2025 |
| Gigwise Limited | Information & communication | 2015 |
| GIO Property Solutions Ltd | Professional & scientific | 2025 |
| GIS Services Ltd | Construction | 2024 |
| GJ Flooring Services Ltd | Construction | 2017 |
| Glal Consultants Ltd | Information & communication | 2015 |
| Glen Douglas Limited | Real estate | 2017 |
| Glendale Residential Care Home Limited | Administrative & support | 2006 |
| Global Consumer Products Limited | Administrative & support | 2010 |
| Global Home Technology Ltd | Professional & scientific | 2018 |
| Global Insulation Specialists Limited | Construction | 2007 |
| Global Tech Impact CIC | Information & communication | 2025 |
| Gmab Invest Ltd | Real estate | 2022 |
| GML Hosting Limited | Information & communication | 2012 |
| GML Technology Limited | Information & communication | 2010 |
| GN Parts Ltd | Wholesale & retail | 2026 |
| Gnarus Engineering Ltd | Professional & scientific | 2018 |
| Gnochgnoch Ltd | Arts & recreation | 2024 |
| Gnosis Technology Ltd | Professional & scientific | 2026 |
| Going Commando Fitness Limited | Arts & recreation | 2015 |
| Going Places Limited | Health & social care | 2014 |
| GOL Futsal Limited | Education | 2022 |
| Gold Gaytes Ltd | Real estate | 2022 |
| Gold Jewellery MEN Ltd | Wholesale & retail | 2020 |
| Goldberry Studio Ltd | Wholesale & retail | 2025 |
| Golden Hands (Painting & Decorating) Ltd | Construction | 2017 |