| FUN Play Vending Ltd | Arts & recreation | 2024 |
| Functional Nutrition & Wellness Limited | Manufacturing | 2026 |
| Funky-Boo Limited | Professional & scientific | 2011 |
| Funrus Ltd | Administrative & support | 2025 |
| Furnace Trading Co. Limited | Wholesale & retail | 1973 |
| Furness Fisheries Limited | Real estate | 2015 |
| Furniture Centre Limited | Wholesale & retail | 2000 |
| Further European Business Limited | Professional & scientific | 2004 |
| Fuse Dynamics Limited | Information & communication | 2024 |
| Fuse Electrical (Northants) Limited | Construction | 2024 |
| Fusion 2D Ltd | Information & communication | 2021 |
| Fusion Energy and Interiors Ltd | Construction | 2025 |
| Future Cabling Services Limited | Construction | 2016 |
| FW1 Newquay Limited | Financial services | 2020 |
| Fwss Property Limited | Real estate | 2025 |
| G & K Kooner Properties Ltd | Real estate | 2025 |
| G & K Logistics Limited | Transport & logistics | 2016 |
| G & M RUG Company Limited | Other services | 2006 |
| G & M Ventures Limited | Financial services | 2019 |
| G and J Enforcement Ltd | Extraterritorial | 2011 |
| G C Carpentry & Kitchens Limited | Construction | 2012 |
| G D Truslove and SON Limited | Construction | 2004 |
| G K Associates (Northampton) Limited | Construction | 2014 |
| G M Build Limited | Construction | 2017 |
| G Marshall Machinery Limited | Wholesale & retail | 2018 |
| G W G M a TEX Limited | Wholesale & retail | 2016 |
| G Williams Construction Limited | Administrative & support | 2021 |
| G&C Robertson Limited | Arts & recreation | 2026 |
| G&O Events Limited | Arts & recreation | 2025 |
| G&V Digital Ventures Ltd | Information & communication | 2026 |
| G. P. Conveyors Ltd. | Manufacturing | 2002 |
| G.B. Property Developments Limited | Real estate | 1993 |
| G.Sokolovas Ltd | Extraterritorial | 2015 |
| G1&L Ltd | Transport & logistics | 2018 |
| Gabriel Care Homes Ltd | Administrative & support | 2005 |
| Gabriel Property Management Limited | Real estate | 2003 |
| Gabs Transport Ltd | Transport & logistics | 2024 |
| Gaia Family Chiropractic Limited | Health & social care | 2026 |
| Galaxy 100 Ltd | Construction | 2023 |
| Gallones Ice Cream Ltd | Manufacturing | 2025 |
| Gallus Consulting Limited | Professional & scientific | 2003 |
| Galvanise.Io Limited | Information & communication | 2018 |
| Gamages Limited | Information & communication | 2023 |
| Game Construction (Kettering) Limited | Construction | 2015 |
| Gamedayclothing Ltd | Manufacturing | 2026 |
| Gamerzoneagn Limited | Wholesale & retail | 2025 |
| GAMES2HIRE Events Ltd | Administrative & support | 2023 |
| GAN Support Ltd | Transport & logistics | 2026 |
| Ganymede IT Limited | Information & communication | 2013 |
| GARAGE7 Kettering Ltd | Wholesale & retail | 2023 |
| Garcha Properties Ltd | Real estate | 2016 |
| Garden Gate Landscapes Limited | Construction | 2009 |
| Garden Street Development Limited | Construction | 2025 |
| Gardiner Quality Consulting Limited | Professional & scientific | 2010 |
| Garley Catering Services (KGC) Limited | Hospitality | 2019 |
| Garley Catering Services (KMH) Ltd | Hospitality | 2019 |
| Garretts' Property Services Limited | Construction | 2001 |
| Gary Mullen Limited | Construction | 2019 |
| Gary Parker-Ms Ltd | Professional & scientific | 2022 |
| Gary Taylor Builders Limited | Construction | 2012 |
| GAS Smart (UK) Limited | Construction | 2013 |
| Gateway Teachers Ltd | Administrative & support | 2022 |
| Gaughan Civils Ltd | Administrative & support | 2024 |
| Gaurav Limited | Information & communication | 2008 |
| Gavron Developments Ltd | Real estate | 2014 |
| Gavwills Limited | Administrative & support | 2022 |
| GB Developments Building and Refurbishment Specialists Ltd | Construction | 2011 |
| GB Home & Garden Ltd | Wholesale & retail | 2022 |
| GB Safety Limited | Professional & scientific | 2003 |
| GB Training Solutions Ltd | Education | 2025 |
| Gbappliances Limited | Water & waste | 2014 |
| GC Biosciences Ltd | Health & social care | 2013 |
| GCA Machinery Sales Limited | Manufacturing | 2009 |
| GCF Services Ltd | Manufacturing | 2025 |
| GCL Performing Arts Academy Limited | Arts & recreation | 2024 |
| Gcnw Ltd | Households | 2024 |
| GCS Build Ltd | Construction | 2021 |
| GD Events and Promotions Ltd | Administrative & support | 2023 |
| GDC Communications Limited | Information & communication | 2014 |
| GDM Delivery Limited | Transport & logistics | 2025 |
| GDR Letting Ltd | Real estate | 2023 |
| Geddington Brickyard Garden C.I.C. | Arts & recreation | 2014 |
| Gedjanelionis Ltd | Transport & logistics | 2024 |
| GEE Business Consultancy Ltd | Professional & scientific | 2019 |
| Gelev UK Limited | Manufacturing | 2018 |
| Gemini Car Conveyors Ltd | Wholesale & retail | 2024 |
| Gems and Crystals Limited | Transport & logistics | 2024 |
| Gems International Learning Hub Ltd | Education | 2020 |
| Generations Recyclers Ltd | Water & waste | 2019 |
| Generators Limited | Professional & scientific | 2000 |
| Genesis Construction and Developments Ltd | Construction | 2022 |
| Genesis Marketing Services (Milton Keynes) Limited | Professional & scientific | 2008 |
| Gentle Bliss Limited | Public administration | 2024 |
| GEO Expert Search Ltd | Administrative & support | 2021 |
| Geo-Barriers Limited | Construction | 2022 |
| George Alan Menswear Limited | Real estate | 1975 |
| Georgie Wilder Ltd | Administrative & support | 2024 |
| Georgina's Beauty Boutique Ltd | Other services | 2015 |
| Gerand Ltd | Real estate | 2001 |
| Gertrude Art Technologies Ltd | Other services | 2021 |