| Gridcity Property Ltd | Real estate | 2024 |
| Gridcore Distribution Ltd | Transport & logistics | 2026 |
| Gridlock Electrical Services Ltd | Wholesale & retail | 2026 |
| Gridmax Project Consulting Ltd | Professional & scientific | 2025 |
| Gridnetics Ltd | Other services | 2018 |
| Gridworx Services Ltd | Construction | 2023 |
| Griff Agriculture Ltd | Manufacturing | 2023 |
| Griffcon Limited | Construction | 2013 |
| Griffin Desserts Ltd | Hospitality | 2023 |
| Griffite Ltd | Households | 2022 |
| Griffiths and Johnson Limited | Manufacturing | 1959 |
| Grig Logistics Ltd | Transport & logistics | 2024 |
| Grill Art Ltd | Hospitality | 2022 |
| Grill Heaven Ltd | Administrative & support | 2017 |
| Grillup Limited | Hospitality | 2025 |
| Grimmhub Ltd | Wholesale & retail | 2025 |
| Grind and Ghost Ltd | Information & communication | 2024 |
| Grindale Limited | Professional & scientific | 1997 |
| Grindall Limited | Construction | 2012 |
| Grindandgarms Ltd | Wholesale & retail | 2025 |
| Grindz Beanz Limited | Extraterritorial | 2014 |
| Gringarten Consulting Ltd | Professional & scientific | 2014 |
| Grish Property Service Limited | Real estate | 2025 |
| Gritizer Ltd | Wholesale & retail | 2024 |
| Grits Bits Exterior Cleaning Limited | Administrative & support | 2025 |
| Grix Contracting Limited | Professional & scientific | 2026 |
| Grizzah Healthcare Ltd | Health & social care | 2024 |
| Grochowina Ltd | Transport & logistics | 2025 |
| Groomingdales Ltd | Other services | 2021 |
| Grooving World Ltd | Other services | 2025 |
| Grosbross Limited | Construction | 2024 |
| Grosser Limited | Wholesale & retail | 2015 |
| Grosser Tiles & Marbles Ltd | Construction | 2018 |
| Grosssu Logistic Ltd | Transport & logistics | 2022 |
| Ground Grafters Limited | Administrative & support | 2017 |
| Ground Level Maintenance Limited | Manufacturing | 1998 |
| Groundmutual Property Management Limited | Households | 1996 |
| Grounds Management Association Limited | Other services | 1955 |
| Groundtest Ltd | Professional & scientific | 2023 |
| Groundwork Creations Limited | Administrative & support | 2014 |
| Group 24 Limited | Administrative & support | 2012 |
| Group Homekey Ltd | Financial services | 2022 |
| GROUP4 Tech Ltd | Information & communication | 2025 |
| Groupcbs Europe Ltd | Manufacturing | 2013 |
| Grove Construction Limited | Construction | 2012 |
| Grove Light Ltd | Information & communication | 2021 |
| Grow Football Coaching Ltd | Arts & recreation | 2024 |
| Grow More Investments Ltd | Real estate | 2019 |
| Grow Online Marketing Ltd | Professional & scientific | 2012 |
| Growing Better Lives CIC | Health & social care | 2007 |
| Growing Green Limited | Agriculture & fishing | 2003 |
| Growth & Greatness CIC | Information & communication | 2024 |
| Growth Studio Ltd | Professional & scientific | 2014 |
| Growth Training & Consulting Ltd | Professional & scientific | 2021 |
| Growthdeck Property Dundee Holdings Limited | Financial services | 2019 |
| Growthdeck Property Dundee Limited | Real estate | 2019 |
| Growthify Accountancy Ltd | Professional & scientific | 2024 |
| Groww Tech Ltd | Professional & scientific | 2022 |
| GRS Flatpack Ltd | Construction | 2022 |
| Grubspice Ltd | Hospitality | 2026 |
| Grubtrans Ltd | Transport & logistics | 2024 |
| GS Assured Solution Limited | Professional & scientific | 2025 |
| GS Cable Solutions Limited | Construction | 2017 |
| GS Cloud Limited | Information & communication | 2024 |
| GS Home Lettings Ltd | Households | 2023 |
| GS Professional Services Limited | Information & communication | 2018 |
| GS Venturis Limited | Real estate | 2017 |
| Gs&Gs Construction UK Limited | Construction | 2025 |
| GSB Exterior Cleaning Services Limited | Construction | 2012 |
| GSB Warehouse Services Ltd | Transport & logistics | 2022 |
| GSD Building Maintenance Ltd | Construction | 2013 |
| Gsgcomplex Limited | Information & communication | 2017 |
| GSL Care Limited | Health & social care | 2023 |
| GSM Safety Solutions Limited | Administrative & support | 2025 |
| GSO Engineering UK LLP | | 2007 |
| GSR Design Ltd | Professional & scientific | 2026 |
| GST MK Ltd | Wholesale & retail | 2022 |
| Gsvengineeringmk Ltd | Manufacturing | 2015 |
| GT Care Limited | Health & social care | 2016 |
| GT English Enterprise Limited | Professional & scientific | 2012 |
| GT Events Limited | Administrative & support | 2013 |
| GT Gates Ltd | Manufacturing | 2019 |
| GT Live Events Ltd | Arts & recreation | 2012 |
| GTA Property Services Ltd | Real estate | 2022 |
| GTB Technical Services Limited | Construction | 2013 |
| Gtdistro Ltd | Wholesale & retail | 2025 |
| Gtem Vehicle Logistics Ltd | Transport & logistics | 2016 |
| Gtews Ltd | Other services | 2021 |
| GTI Brickwork Ltd | Construction | 2017 |
| GTM Electrical Company Limited | Administrative & support | 1999 |
| Gtog Limited | Information & communication | 2015 |
| GTS Engineering & Manufacturing Ltd | Administrative & support | 2022 |
| GTS Group Holdings Ltd | Professional & scientific | 2021 |
| GTS International Ltd | Professional & scientific | 2020 |
| GTS Space & Aerospace Ltd | Administrative & support | 2022 |
| GTS Transportation Ltd | Administrative & support | 2022 |
| Guaba Care Ltd | Health & social care | 2018 |
| Guanxi Global Direct Selling Limited | Wholesale & retail | 2012 |
| Guardi Supply Ltd | Wholesale & retail | 2025 |
| Guardian Compliance Fire and Security Limited | Construction | 2026 |