| Gridserve Holdings Limited | Financial services | 2017 |
| Gridserve Retail Limited | Wholesale & retail | 2023 |
| Gridserve Sun to Wheel Ltd | Energy | 2022 |
| Gridserve Sunway Ltd | Energy | 2023 |
| Gridserve Sustainable Energy Limited | Energy | 2017 |
| Gridserve Technologies Ltd | Information & communication | 2018 |
| Gridserve UK OMM Ltd | Energy | 2017 |
| Gridserve UK Projects Ltd | Energy | 2015 |
| Gridserve WBC Limited | Energy | 2018 |
| Griffco Construction Services Ltd | Construction | 2023 |
| Grigore Ltd | Construction | 2026 |
| Grill and Fish Bar (Swindon) Ltd | Hospitality | 2025 |
| Grime Solutions Ltd | Manufacturing | 2025 |
| Grimi Construction Ltd | Construction | 2019 |
| Grooveline Music Education Surrey LLP | | 2024 |
| Grosvenor 17 and 19 Property Management Company Ltd | Households | 2018 |
| Groundteq Limited | Construction | 2020 |
| Groundwell Business Centre Limited | Real estate | 2017 |
| Group Bertoldo Ltd | Transport & logistics | 2026 |
| Grove Kebab Van Ltd | Hospitality | 2025 |
| Grove Learning Trust | Education | 2011 |
| Grove Select Vehicles Ltd | Wholesale & retail | 2020 |
| Grovelands Contractors Limited | Construction | 2013 |
| Grow Khula Evolve Ltd | Education | 2024 |
| Grow What Matters Ltd | Administrative & support | 2024 |
| Growth Sherpa Limited | Extraterritorial | 2018 |
| Growvanta Ltd | Professional & scientific | 2020 |
| Groy Products Ltd | Wholesale & retail | 2025 |
| GRS Trading Ltd | Real estate | 2025 |
| GRS Valeting Services Limited | Administrative & support | 2017 |
| Grumpy Dwarf Limited | Administrative & support | 2004 |
| Grumpy Joinery Limited | Construction | 2023 |
| GS Executive Transfers Ltd | Transport & logistics | 2023 |
| GS Yuasa Battery Europe Limited | Manufacturing | 2002 |
| GS Yuasa Battery Sales UK Limited | Wholesale & retail | 1981 |
| GSA Traders Ltd | Wholesale & retail | 2023 |
| GSN Management Ltd | Professional & scientific | 2024 |
| GSP Propdev Ltd | Construction | 2025 |
| GT Tonetto Ltd | Hospitality | 2022 |
| GT74 Ltd | Other services | 2019 |
| GTB Castle Limited | Professional & scientific | 2000 |
| Gtclean & Shine Ltd | Administrative & support | 2025 |
| Gtco Ltd | Information & communication | 2023 |
| Gtev-Rex Ltd. | Construction | 2015 |
| GTR Design Services Limited | Professional & scientific | 2023 |
| GTT Automotive Limited | Wholesale & retail | 2022 |
| GU Construction Limited | Transport & logistics | 2006 |
| Guardian Carers UK Limited | Health & social care | 2005 |
| Guardian Pulse Ltd | Health & social care | 2025 |
| Guardian Realty NO 1 Ltd | Real estate | 2012 |
| Guardian Realty NO 2 Ltd | Real estate | 2011 |
| Guardians Digital Ltd | Professional & scientific | 2026 |
| Guardians Group Ltd | Financial services | 2021 |
| Guardians Property Investments Ltd | Real estate | 2024 |
| Guardians Training Ltd | Administrative & support | 2020 |
| Guga-Pol Ltd | Transport & logistics | 2014 |
| Guild House RTM Company Limited | Households | 2021 |
| GUL Consultancy Ltd | Professional & scientific | 2023 |
| Gulshan Brasserie Limited | Hospitality | 2001 |
| Gumbo Holdings Limited | Professional & scientific | 2015 |
| Gunduz Mobile Barber Ltd | Other services | 2020 |
| Gunduz Property Ltd | Real estate | 2018 |
| Gunes Kebab Limited | Hospitality | 2026 |
| Gurbani Restaurants Ltd | Hospitality | 2019 |
| Gurgutova Ltd | Health & social care | 2013 |
| Guri Building Ltd | Construction | 2024 |
| Gurkha 2023 Ltd | Hospitality | 2023 |
| Gurkha Mini Market Limited | Wholesale & retail | 2009 |
| Gurkha Unisex Hair & Beauty Salon Limited | Other services | 2016 |
| Gurkhali Property Ltd | Real estate | 2024 |
| Gursimran Transport Limited | Transport & logistics | 2025 |
| Gursirat Supermarket Ltd | Wholesale & retail | 2023 |
| Gurt Sauces Ltd | Manufacturing | 2024 |
| Gurt Wings Ltd | Hospitality | 2018 |
| Gurung Rentals Ltd | Administrative & support | 2025 |
| Guruvun Properties Ltd | Extraterritorial | 2024 |
| Gusto Tool Co Limited | Manufacturing | 2025 |
| Gustoso Ltd | Hospitality | 2019 |
| Guthrie Communications Ltd | Professional & scientific | 2019 |
| Gutowski Estates Limited | Real estate | 2025 |
| Guvercin Investments Ltd | Real estate | 2025 |
| GW Fitness Ltd | Arts & recreation | 2015 |
| GW Transform Ltd | Professional & scientific | 2025 |
| Gwaste Ltd | Water & waste | 2022 |
| GWB Roofing Limited | Construction | 2015 |
| GWD Fire Ltd | Public administration | 2024 |
| Gwen Holdings Limited | Financial services | 2016 |
| Gwhr Limited | Administrative & support | 2022 |
| GWR Roofing Ltd | Construction | 2024 |
| GWS Property Ltd | Real estate | 2024 |
| Gwtaxisswindon Ltd | Transport & logistics | 2023 |
| Gwynt Y MOR Offshore Wind Farm Limited | Energy | 1999 |
| Gxpt Consulting Ltd | Professional & scientific | 2024 |
| Gyer Design Limited | Wholesale & retail | 2003 |
| Gypwall Systems Limited | Construction | 2001 |
| Gyrogefsis Ltd | Hospitality | 2022 |
| H & a Cards Limited | Wholesale & retail | 2004 |
| H & a Fashion Limited | Wholesale & retail | 2022 |
| H & a Kebab Ltd | Hospitality | 2017 |
| H & C Haulage Limited | Transport & logistics | 2002 |