| FIX My Motor Ltd | Wholesale & retail | 2020 |
| FJB Developments Limited | Construction | 2019 |
| FJG Commercial Consultancy Limited | Professional & scientific | 2018 |
| FJH Building Services Limited | Administrative & support | 2015 |
| Flakes & Shakes Ltd | Wholesale & retail | 2021 |
| Flamingo Billericay Ltd | Wholesale & retail | 2023 |
| Flamingo Capital Limited | Financial services | 2017 |
| Flecto Consulting Ltd | Professional & scientific | 2025 |
| Flint Investments and Developments Limited | Real estate | 2020 |
| Flint Property Investments (Mayflower House) Limited | Real estate | 2021 |
| Flint Property Investments (Stock Road) Limited | Real estate | 2020 |
| Flint Property Investments 1 Limited | Real estate | 2021 |
| Flint Property Investments 2 Limited | Real estate | 2021 |
| Flint Property Investments 3 Limited | Real estate | 2022 |
| Flint Property Management Ltd | Administrative & support | 2020 |
| Floor Technologies (UK) Ltd | Construction | 2011 |
| Flow PMC Ltd | Professional & scientific | 2025 |
| Flower Thai Massage, Beauty & Retail Hornchurch Ltd | Other services | 2020 |
| Flowerz Ltd | Wholesale & retail | 2026 |
| Flowerz Power Ltd | Wholesale & retail | 2026 |
| Flowtech LDN Limited | Construction | 2026 |
| Fluent in Property 1 Ltd | Real estate | 2022 |
| Fluxuator Limited | Construction | 2018 |
| Flying Fish Pictures Ltd | Information & communication | 2025 |
| Fmac Consulting Ltd | Administrative & support | 2013 |
| Fmac Property Ltd | Construction | 2015 |
| FMJ Group Ltd | Real estate | 2023 |
| Fnkr Property Ltd | Construction | 2026 |
| Fonndillion Electrical Services Ltd | Construction | 2026 |
| Food Plus Essex Ltd | Wholesale & retail | 2023 |
| Football Supporters Supporting Football Limited | Other services | 2024 |
| Footy Tots Limited | Arts & recreation | 2005 |
| Forbes Property Consultants Limited | Professional & scientific | 2021 |
| Ford Limited | Professional & scientific | 1997 |
| Fore Point Design Limited | Wholesale & retail | 2023 |
| Fore Property Development Limited | Construction | 2022 |
| Foremost Green Limited | Real estate | 2022 |
| Forest Escapes Limited | Real estate | 2021 |
| Forever Young Aesthetics Beauty & Skin Ltd | Other services | 2022 |
| Forge Ahead Ironworks Limited | Manufacturing | 2000 |
| Forge Ahead Property Ltd | Administrative & support | 2025 |
| Formidable Group Ltd | Financial services | 2024 |
| Forthbrook Limited | Real estate | 2002 |
| Fortress Interiors Ltd | Construction | 2019 |
| Fortytwo Interactive Limited | Professional & scientific | 2010 |
| Forward Focus Investments Limited | Administrative & support | 2023 |
| Fosters School of Dance Limited | Administrative & support | 2023 |
| Four Oaks Farm Haulage Limited | Transport & logistics | 2017 |
| FOX Cottage Events Ltd | Administrative & support | 2020 |
| FOX Pizzas Ltd | Extraterritorial | 2020 |
| Foxfield UK Limited | Administrative & support | 2008 |
| Frankie's Chalets Limited | Real estate | 2014 |
| Franklands Jewellers Ltd | Wholesale & retail | 2021 |
| Franklin Time Ltd | Other services | 2022 |
| Fred Rigby Limited | Other services | 2015 |
| Freeman Mechanical Ltd | Construction | 2024 |
| Freight PAL GB Limited | Extraterritorial | 2015 |
| Freightdata 2000 Limited | Information & communication | 1988 |
| Fresh and Wild Fish Ltd | Hospitality | 2023 |
| Fresh Perspective Limited | Professional & scientific | 2018 |
| Freshr Social Ltd | Health & social care | 2024 |
| Friary House Southampton Limited | Real estate | 2023 |
| Friern Accountancy Ltd | Professional & scientific | 2009 |
| Frithwood (M & C) Limited | Professional & scientific | 2011 |
| Front Doors Online Limited | Construction | 2016 |
| Front ROW Concierge Limited | Administrative & support | 2026 |
| Frontier Development Group Ltd | Real estate | 2019 |
| Frys Commercial and Residential Cleaning Ltd | Administrative & support | 2026 |
| FSP Invest Limited | Construction | 2024 |
| FTC Holdings and Investments Limited | Administrative & support | 2019 |
| Fudge Artwork & Design Limited | Professional & scientific | 2016 |
| Full of Fizz Ltd | Hospitality | 2018 |
| Full Spectrum Print Media Limited | Manufacturing | 2009 |
| Funactive Ltd | Arts & recreation | 2026 |
| Furniture Master Limited | Other services | 2019 |
| Fusion Access Floors Limited | Construction | 2018 |
| Future Motors Limited | Manufacturing | 2018 |
| FW Autos Limited | Extraterritorial | 2013 |
| G & I Investments Limited | Financial services | 2012 |
| G & S Latter LLP | | 2010 |
| G Digital Limited | Information & communication | 2017 |
| G E H Construction Limited | Construction | 2007 |
| G Harrison Site Services Ltd | Construction | 2023 |
| G Young Construction Limited | Construction | 2021 |
| G&G Olive Limited | Real estate | 2019 |
| G&H Southeast Limited | Construction | 2006 |
| G&N Consulting Limited | Administrative & support | 2015 |
| G.A.W Building Services Ltd | Construction | 2014 |
| G.D. Moss Associates Limited | Other services | 1994 |
| G.Gs Plastering Ltd | Construction | 2022 |
| G.K.L. Properties Limited | Construction | 1994 |
| G.O.A.T Events Ltd | Health & social care | 2020 |
| Gaap Construction Limited | Construction | 2025 |
| Gaik Management Limited | Construction | 2014 |
| Galinago Limited | Professional & scientific | 2013 |
| Ganels Homes Limited | Real estate | 2024 |
| Garagista 55 Limited | Professional & scientific | 2018 |
| Gareth Sutcliffe Editor Ltd | Information & communication | 2015 |
| Garland Court (Billericay) Management Company Limited | Households | 2017 |
| GAS & Heating Southeast Limited | Construction | 2013 |