| FOX International Limited | Professional & scientific | 1969 |
| Foxglove Property Consultants Limited | Real estate | 2015 |
| Foxhouse Limited | Administrative & support | 2021 |
| Foye Engineering Ltd | Construction | 2023 |
| FPI Limited | Wholesale & retail | 2000 |
| FPM IT and Digital Consultancy Ltd | Information & communication | 2024 |
| FPR Media Consulting Limited | Professional & scientific | 2016 |
| Fptv Productions Ltd | Information & communication | 2023 |
| FRA Group Holdings Ltd | Financial services | 2025 |
| FRA Property Solutions Ltd | Real estate | 2020 |
| Fractorius Limited | Financial services | 2024 |
| Framekit Limited | Information & communication | 2025 |
| Frames 2 the Trade Ltd | Construction | 2024 |
| Franbuild Ltd. | Construction | 2008 |
| Frank Hayes Limited | Administrative & support | 2005 |
| Frankton Group Ltd | Administrative & support | 2017 |
| Fraser-Ross Finance Limited | Real estate | 1974 |
| Frasers Aerospace Limited | Wholesale & retail | 1999 |
| Frazer Block F Freeholders Limited | Real estate | 2010 |
| Frederick Edward Lettings Limited | Real estate | 2016 |
| Freebournes Two Limited | Administrative & support | 2013 |
| Freestyle Leaders of the World Limited | Extraterritorial | 2011 |
| Freight 24 Logistics Limited | Transport & logistics | 1983 |
| Frenches Farm LLP | | 2021 |
| Frenchies Essex Ltd | Professional & scientific | 2018 |
| Fresh Americana Ltd | Wholesale & retail | 2023 |
| Freshstart Nutrition Limited | Manufacturing | 2024 |
| Freshwell Coffee Ltd | Manufacturing | 2020 |
| Fressingfield Vineyard Ltd | Agriculture & fishing | 2026 |
| Friour Limited | Administrative & support | 2017 |
| Fripps Farm Animal Rescue CIC | Agriculture & fishing | 2022 |
| Frog London Hairdressing Ltd | Other services | 2011 |
| Frogs Drama Limited | Education | 2012 |
| Frontier Architecture Ltd | Professional & scientific | 2017 |
| Frontleader Investments Limited | Administrative & support | 1990 |
| Frontline Connect Care Limited | Health & social care | 2026 |
| Frontline Partnership | Health & social care | 2002 |
| Fryer and Fount Ltd | Hospitality | 2025 |
| FS Synergy Ltd | Construction | 2025 |
| FSC Distribution Limited | Wholesale & retail | 2012 |
| FTL Electrical Services Ltd | Other services | 2010 |
| FTV Construction Ltd | Construction | 2025 |
| Fudy Limited | Information & communication | 2012 |
| Fujairah OIL and GAS UK 11 Limited | Administrative & support | 1959 |
| Fuli Martial Arts Ltd | Education | 2014 |
| Full Circle Events Limited | Hospitality | 2019 |
| Full House Studio Ltd | Professional & scientific | 2023 |
| Furnells Ltd | Professional & scientific | 2005 |
| Furness Quay Phase 2 Limited | Construction | 2016 |
| Furnish by Neal Lewer & Co Ltd | Construction | 2009 |
| Furnishings by Carley Ltd | Other services | 2010 |
| Furniture Enterprises Ltd | Manufacturing | 2018 |
| Fusey Productions Ltd | Information & communication | 2023 |
| Fusion Eaterie Limited | Hospitality | 2004 |
| Futebol UK Limited | Professional & scientific | 2020 |
| Future Chemicals Solutions Ltd | Administrative & support | 2024 |
| Future Contracting M&E Ltd | Construction | 2017 |
| Future Landscaping Designs Ltd | Administrative & support | 2022 |
| Futuresight AI Ltd | Information & communication | 2025 |
| FVS Medicine Ltd | Professional & scientific | 2023 |
| FX Expert Services Limited | Financial services | 2025 |
| FXP Ventures Ltd | Administrative & support | 2025 |
| Fyfield Cody Consulting Ltd | Professional & scientific | 2026 |
| G & P Transport Services Ltd | Transport & logistics | 2008 |
| G & R Barbers Ltd | Other services | 2025 |
| G & S Vedi Ltd | Real estate | 2022 |
| G a Metals Ltd | Wholesale & retail | 2020 |
| G B Property Services Ltd. | Extraterritorial | 2008 |
| G Burke Decorating Contractors Limited | Construction | 2003 |
| G C F Tiling Design Limited | Construction | 2017 |
| G Cowley Consultancy Ltd | Arts & recreation | 2022 |
| G Economy Limited | Professional & scientific | 2003 |
| G J Residential Limited | Real estate | 2023 |
| G Karthikeyan Limited | Real estate | 2011 |
| G M Works Limited | Construction | 2014 |
| G O'Rourke Electrical Limited | Construction | 2020 |
| G P Hibbs Ltd | Manufacturing | 2018 |
| G R W Tech Ltd | Construction | 2022 |
| G Transport Limited | Transport & logistics | 2013 |
| G&D MK Developments Limited | Construction | 2019 |
| G&T Rentals and Recovery Ltd | Administrative & support | 2023 |
| G. Moore & W. Barry Painting and Decorating Limited | Construction | 2007 |
| G. S. Skips and Recycling Ltd | Transport & logistics | 2012 |
| G.D.H.Limited | Professional & scientific | 1944 |
| G.H.R. Southern Ltd. | Construction | 2004 |
| G.I. Hutton (Builders) Limited | Construction | 1975 |
| G.S Management & Consultancy Ltd | Professional & scientific | 2011 |
| GA Metal Properties Ltd | Real estate | 2019 |
| GAB Build Ltd | Construction | 2017 |
| Gabriel Aesthetics Limited | Health & social care | 2019 |
| Gadget Sales Brentwood Ltd | Wholesale & retail | 2026 |
| Gadgets Solution Brentwood Ltd | Manufacturing | 2019 |
| Gadsby Consultancy Ltd | Professional & scientific | 2023 |
| Gains Clark Ltd | Financial services | 2021 |
| Gainsborough Corporation Limited | Wholesale & retail | 2014 |
| Gaisford Associates Ltd | Professional & scientific | 2011 |
| Galaxy Numbers Limited | Information & communication | 2010 |
| Galleon Court (Phase 2) Management Limited | Real estate | 2000 |
| Galleon House Residents Association Limited | Real estate | 1996 |
| Galore Investments Limited | Wholesale & retail | 2010 |