| G Contractors Limited | Construction | 2020 |
| G F Hussain Ltd | Hospitality | 2025 |
| G G S Service Ltd | Construction | 2026 |
| G Luczak Ltd | Construction | 2014 |
| G M Construction (Middlesex) Ltd | Construction | 2015 |
| G N R Design and Build Ltd | Construction | 2018 |
| G N R Skip Hire Ltd | Transport & logistics | 2020 |
| G S Kitchen and Bedroom Ltd | Construction | 2022 |
| G S Sandhu Construction Limited | Construction | 2019 |
| G Tank Solutions Limited | Information & communication | 2017 |
| G&A Capital Limited | Real estate | 2025 |
| G&Ak Ltd | Hospitality | 2022 |
| G&E Roofing Ltd | Construction | 2025 |
| G&H Autos Ltd | Wholesale & retail | 2025 |
| G&H Babbar Investment Ltd | Real estate | 2026 |
| G&K Holding Group Ltd | Financial services | 2026 |
| G&K Shipbrokers Limited | Professional & scientific | 2014 |
| G&M Tech Ltd | Transport & logistics | 2026 |
| G-Tec Distribution Limited | Wholesale & retail | 2002 |
| G.Andrews Hair Saloon Limited | Other services | 2016 |
| G.H. Sidhu Trading Ltd | Wholesale & retail | 2025 |
| G.P Hounslow Auto Repair Ltd | Wholesale & retail | 2018 |
| G2 Creations Ltd | Manufacturing | 2025 |
| G2 Homes Limited | Real estate | 2020 |
| G2B Properties Limited | Real estate | 2020 |
| G3 Worldwide Mail (UK) Limited | Transport & logistics | 1955 |
| G4C Limited | Administrative & support | 2023 |
| G4K Staffing Ltd | Construction | 2025 |
| G4U Services Ltd | Administrative & support | 2025 |
| G8 West Investments Ltd | Real estate | 2026 |
| GA Hills Ltd | Other services | 2023 |
| Gaba Assets Ltd | Real estate | 2019 |
| Gaba Brothers Mini Mart Ltd | Wholesale & retail | 2021 |
| Gaba Brothers Properties UK Ltd | Wholesale & retail | 2018 |
| Gaba Estate Ltd | Other services | 2017 |
| Gabriel Tsvetanov Ltd | Wholesale & retail | 2019 |
| Gadda Ltd | Wholesale & retail | 2026 |
| Gadget Ground Ltd | Wholesale & retail | 2024 |
| GADGET2FIX Ltd | Administrative & support | 2023 |
| Gadgets and Mobile Repair Ltd | Manufacturing | 2025 |
| Gadgets Guru Ltd | Hospitality | 2023 |
| Gadgets World Ltd | Wholesale & retail | 2025 |
| Gadher Associates Limited | Professional & scientific | 2013 |
| GAG Construction Ltd | Construction | 2021 |
| Gagan Ltd | Hospitality | 2026 |
| Gaggu Ltd | Real estate | 2020 |
| Gaha Properties Ltd | Real estate | 2026 |
| Gaia Bianchini Design Ltd | Professional & scientific | 2023 |
| Gaia Living Limited | Real estate | 2025 |
| Galaxy Commercial Services Ltd | Administrative & support | 2014 |
| Galaxy Construction Ltd | Construction | 2023 |
| Galaxy Estate Management Ltd | Wholesale & retail | 2022 |
| Galaxy Food & Wine Hounslow Limited | Wholesale & retail | 2014 |
| Galaxy Interior Design Ltd | Professional & scientific | 2025 |
| Galaxy Super Food UK Ltd | Wholesale & retail | 2021 |
| Galvanize Health Limited | Information & communication | 2025 |
| Game Sphere Limited | Wholesale & retail | 2024 |
| Gameo Limited | Wholesale & retail | 2024 |
| Games-Realm Ltd | Wholesale & retail | 2012 |
| Gamestech Ltd | Wholesale & retail | 2022 |
| Ganap IT Ltd | Information & communication | 2017 |
| Gandham Labs Ltd | Information & communication | 2016 |
| Ganesh Business Services Limited | Information & communication | 2012 |
| Ganeshy Investments Ltd | Real estate | 2025 |
| Ganger Group Ltd | Administrative & support | 2014 |
| Garage Cartel Ltd | Wholesale & retail | 2024 |
| Garbarz Transport Ltd | Transport & logistics | 2016 |
| Garden Shore Limited | Information & communication | 2020 |
| Gardens World & Gazebo's Limited | Wholesale & retail | 2023 |
| Garrison Consultant Limited | Professional & scientific | 2017 |
| Garry & Sons Ltd | Real estate | 2020 |
| Garuda Flyers Limited | Real estate | 2026 |
| Garwin Consultants Ltd | Information & communication | 2017 |
| Gary Estates Ltd | Real estate | 2026 |
| Gary Food & Wine Ltd | Wholesale & retail | 2022 |
| GAS Geeks Ltd | Construction | 2017 |
| Gate Guardian Ltd | Wholesale & retail | 2018 |
| Gatebridge Properties Ltd | Construction | 2020 |
| Gatebridge Property Maintenance Ltd | Construction | 2021 |
| Gatish RAM Investment Ltd | Real estate | 2025 |
| Gavin's Travel Limited | Transport & logistics | 2023 |
| GB Books Publishers & Distributors Ltd | Information & communication | 2021 |
| GB Convenience Stores Limited | Wholesale & retail | 2022 |
| GB Gases (London) Ltd | Transport & logistics | 2017 |
| GB Supreme Ltd | Administrative & support | 2024 |
| GB88 Impex Ltd | Wholesale & retail | 2025 |
| GBH (Europe) Ltd | Mining & quarrying | 2017 |
| Gbmhomecare Limited | Other services | 2010 |
| GBN Transport Limited | Transport & logistics | 2011 |
| GBO Ratan Ltd | Wholesale & retail | 2024 |
| GBR Foods Ltd | Hospitality | 2018 |
| GBS (UK) Ltd | Health & social care | 2009 |
| GBS Care Ltd | Health & social care | 2013 |
| GBS Commercial Ltd | Real estate | 2025 |
| GBS Development London Ltd | Real estate | 2023 |
| GBS Private Enterprise Ltd | Transport & logistics | 2020 |
| GBS Real Estate Ltd | Real estate | 2023 |
| GC Speedy Ltd | Transport & logistics | 2025 |
| GCK Consulting Services Ltd | Information & communication | 2020 |
| GCK Real Estate Ltd | Real estate | 2023 |