| Frampton Servicing Limited | Manufacturing | 1997 |
| Frances DEE Limited | Real estate | 1950 |
| Francesca Smyth Ltd | Professional & scientific | 2019 |
| Freeholders W7 Ltd | Households | 2026 |
| Freemaginarium Limited | Information & communication | 2025 |
| Fresh and Tasty Croydon Ltd | Hospitality | 2019 |
| Fresh Fruit & VEG UK Imports Ltd | Wholesale & retail | 2024 |
| FRH Consultants Limited | Financial services | 2025 |
| Friars Mead (Edgware) Residents Association Limited | Households | 2001 |
| Friarsmead (Freehold) Limited | Administrative & support | 2003 |
| Friel Electrical Ltd | Construction | 2021 |
| Friel Enterprises Limited | Professional & scientific | 2015 |
| Friel Ltd | Professional & scientific | 2023 |
| Friends Restaurant Limited | Hospitality | 2012 |
| Fringecrown Limited | Real estate | 1980 |
| FRJ Aviation Limited | Transport & logistics | 2026 |
| Frogmore Nursery Ltd | Education | 2024 |
| Front Point Capital Limited | Professional & scientific | 2023 |
| Frontier Group Estates Limited | Construction | 2022 |
| Frontier Group Investments Limited | Construction | 2023 |
| Frontier Group Limited | Construction | 2022 |
| Frontier Real Estate Limited | Construction | 2022 |
| Frontier View Limited | Construction | 2023 |
| Fruity Fresh (Western) Limited | Wholesale & retail | 1993 |
| FST Solutions Ltd | Construction | 2023 |
| FTG Group Ltd | Real estate | 2019 |
| Fudoshin Ju-Jitsu Ltd | Other services | 2014 |
| Fuel Drivers UK Limited | Administrative & support | 2018 |
| Fulham Pharmacy Limited | Wholesale & retail | 2008 |
| Fullstack Technology Ltd | Information & communication | 2020 |
| Function First Care Ltd | Health & social care | 2022 |
| Furniturestopuk Limited | Wholesale & retail | 2014 |
| Fusion Lights Limited | Wholesale & retail | 2017 |
| Future Daleel Advertising Services Company Ltd | Professional & scientific | 2019 |
| Future Productions Films Limited | Manufacturing | 2010 |
| Futurelane Advisory Ltd | Professional & scientific | 2025 |
| Futureops Limited | Real estate | 2019 |
| Fuzzy Monkey Limited | Real estate | 2025 |
| FVZ Pharma LLP | | 2011 |
| G & M Associates Limited | Real estate | 2026 |
| G Badial Building and Maintenance Limited | Construction | 2022 |
| G J M Jones Limited | Manufacturing | 2013 |
| G N 11 Limited | Wholesale & retail | 2014 |
| G Rose Interiors Ltd | Construction | 2022 |
| G Sloane Holdings Ltd | Real estate | 2025 |
| G Way Productions Limited | Information & communication | 2022 |
| G&O Solutions Ltd. | Households | 2014 |
| G-20 Strategies Ltd | Information & communication | 2023 |
| G-Max Properties Limited | Administrative & support | 2008 |
| G-Unit Removals Ltd | Transport & logistics | 2017 |
| G. a. Engineering (South East) Limited | Professional & scientific | 2012 |
| G.A. Wood & Co. Limited | Real estate | 1929 |
| Gableend Solutions Limited | Information & communication | 2002 |
| Gaborelu Ltd | Construction | 2022 |
| Gabriel Court Limited | Health & social care | 2002 |
| Gadget Repair Centre Ltd | Manufacturing | 2020 |
| Gagneja Ltd | Professional & scientific | 2026 |
| Gala-Transport Ltd | Transport & logistics | 2014 |
| Gallant Contractors Ltd | Construction | 2017 |
| Galleons View Apartments Limited | Households | 1999 |
| Gamanah Limited | Education | 2025 |
| Gambron Ltd | Manufacturing | 2015 |
| Gamemind Labs Limited | Information & communication | 2024 |
| Games Based Learning Ltd | Education | 2023 |
| Garioch Estates Ltd | Real estate | 2016 |
| Garnets Accountancy Services Limited | Professional & scientific | 2019 |
| Garth Allardice Limited | Health & social care | 2017 |
| Gary Moyes Photography Limited | Professional & scientific | 2023 |
| GAS and Heating Think Tank Limited | Construction | 2011 |
| GAS N POW3R Ltd | Wholesale & retail | 2012 |
| Gastro & Allergy Solutions Ltd | Health & social care | 2016 |
| Gastrosurgery UK Ltd | Administrative & support | 2009 |
| Gauri and Krishna Tech Ltd | Information & communication | 2010 |
| Gavacan (Ascot) Ltd | Construction | 2024 |
| Gavacan (DRN) Ltd | Construction | 2026 |
| Gavacan (G.E.) 2 Ltd | Construction | 2025 |
| Gavacan (G.E.) Ltd | Construction | 2024 |
| Gavacan (Northwood) Developments Ltd | Real estate | 2024 |
| Gavacan (Rickmansworth) Ltd | Construction | 2025 |
| Gavacan Construction (2) Limited | Real estate | 2026 |
| Gavacan Investments Limited | Real estate | 2022 |
| Gavacan Property Ltd | Construction | 2025 |
| Gavacan TS Ltd | Construction | 2024 |
| Gavin HQ Limited | Arts & recreation | 2003 |
| Gavin HQ Property Services Limited | Real estate | 2020 |
| Gawain Ltd | Information & communication | 2025 |
| Gazzign Limited | Manufacturing | 2013 |
| GBV Building Ltd | Construction | 2014 |
| Gd&H Limited | Health & social care | 2024 |
| GD88 Ltd | Construction | 2013 |
| Geary Residences Limited | Financial services | 2025 |
| GEC UK Services Limited | Other services | 2025 |
| Geeta Mehta Limited | Professional & scientific | 2008 |
| Geezers Barber Shop Ltd | Other services | 2025 |
| GEM Care 1 Limited | Professional & scientific | 2009 |
| GEM Care 6 Limited | Health & social care | 2013 |
| GEM Care Limited | Professional & scientific | 2005 |
| GEM Management Consulting Ltd | Professional & scientific | 2025 |
| GEMINI7 Ltd | Wholesale & retail | 2019 |
| GEN Z Financial Ltd | Financial services | 2025 |