| Graydin Ltd | Other services | 2011 |
| Grayshot Investments Limited | Other services | 1987 |
| Graysn Mithu Ltd | Real estate | 2021 |
| Grazing With Gazelles Limited | Professional & scientific | 2018 |
| Grcgds Ltd | Information & communication | 2018 |
| GRE UK Investments Ltd | Real estate | 2025 |
| Great Adventures Await Ltd | Administrative & support | 2018 |
| Great Seabrook Solar Limited | Energy | 2012 |
| Greatorex-Davies Limited | Professional & scientific | 1985 |
| Green and Blue Food and Wine Ltd | Wholesale & retail | 2018 |
| Green and Hove Limited | Hospitality | 2019 |
| Green Boys Gardens Ltd | Professional & scientific | 2023 |
| Green Builders Sussex Limited | Construction | 2013 |
| Green Data Services Ltd | Information & communication | 2022 |
| Green Dental and Implant Clinic Limited | Health & social care | 2021 |
| Green Monkey Consultancy Ltd | Professional & scientific | 2019 |
| Green MOP Ltd | Administrative & support | 2007 |
| Green MOP Trustees Limited | Administrative & support | 2025 |
| Green OAT Studios Limited | Information & communication | 2026 |
| Green Power (Southern) Trading Ltd | Construction | 2025 |
| Green Shoot Consultancy Ltd | Professional & scientific | 2020 |
| Green Tree Timber Limited | Administrative & support | 2005 |
| Green Urban London Ltd | Agriculture & fishing | 2021 |
| Green Wave Productions Ltd | Information & communication | 2015 |
| Green Welly Ditchling Ltd | Hospitality | 2026 |
| Greenacres HK Limited | Extraterritorial | 2014 |
| Greenarch Systems Ltd | Information & communication | 2024 |
| Greenburg Pro (Client) Limited | Wholesale & retail | 2019 |
| Greenburg Pro Limited | Wholesale & retail | 2022 |
| Greencoat House VG Limited | Real estate | 2025 |
| Greenheart Properties Limited | Construction | 2014 |
| Greenland Vape Store Ltd | Wholesale & retail | 2026 |
| Greenslade 1946 Limited | Real estate | 1989 |
| Greenwave Coaching Ltd | Other services | 2020 |
| Greenway Enterprises Limited | | 1991 |
| Greenway Search Ltd | Administrative & support | 2024 |
| Greenwood Enterprises Limited | Households | 1989 |
| Greg Mann Building Services Ltd | Construction | 2011 |
| Gremkaco Ltd | Professional & scientific | 2013 |
| Greylands Manor Investments Ltd | Real estate | 2022 |
| Gridlink Limited | Extraterritorial | 2010 |
| Gridmesh Limited | Extraterritorial | 2010 |
| Griefscope CIC | Health & social care | 2026 |
| Griff Consulting Ltd | Professional & scientific | 2013 |
| Griffin Hunter Limited | Hospitality | 2018 |
| Griffin Mobility Ltd | Construction | 2025 |
| Grimm Forge Ltd | Manufacturing | 2025 |
| Grnfld Studio Ltd | Wholesale & retail | 2024 |
| Groove Garden Studios Ltd | Information & communication | 2024 |
| Grosvenor Properties Sussex Limited | Hospitality | 1999 |
| Ground Control by Gareth John Limited | Administrative & support | 2024 |
| Ground Glass Limited | Information & communication | 2013 |
| Ground Mortgage Solutions Limited | Financial services | 2025 |
| Ground Rents (Sussex) Limited | Real estate | 1984 |
| Grow (People Development) Limited | Administrative & support | 2024 |
| Grow Green Ltd | Professional & scientific | 2023 |
| Growing Business Services Limited | Professional & scientific | 2015 |
| Growing Happy Limited | Information & communication | 2017 |
| Grrd Limited | Education | 2025 |
| GS Clearance Holdings Ltd | Financial services | 2024 |
| GS Clearance Ltd | Water & waste | 2024 |
| GSC Sussex Properties Ltd | Real estate | 2022 |
| GSG Film & TV Limited | Information & communication | 2018 |
| Gsii Aston Clinton Solar Farm Limited | Energy | 2013 |
| Gsii Belper Limited | Energy | 2015 |
| Gsii Bicester Solar Farm Limited | Energy | 2012 |
| Gsii Carmarthen Solar Limited | Energy | 2014 |
| Gsii Clay Cross Limited | Energy | 2015 |
| Gsii Homestead Solar Farm Limited | Energy | 2013 |
| Gsii Mount Farm Limited | Energy | 2013 |
| Gsii Potters Bar Limited | Energy | 2015 |
| Gsii Rose & Crown Limited | Energy | 2013 |
| Gsii Sovgen Limited | Financial services | 2012 |
| Gsii Upper Meadowley Limited | Energy | 2014 |
| Gsii Vine Farm Limited | Energy | 2014 |
| Gssf Properties Ltd | Real estate | 2018 |
| GT Contractors Limited | Construction | 2012 |
| Gtdent Ltd | Health & social care | 2025 |
| GTT Training Limited | Transport & logistics | 2014 |
| Guava Brighton Ltd | Manufacturing | 2023 |
| Guestcentric Solutions Ltd | Professional & scientific | 2025 |
| Guido Cuba Limited | Health & social care | 2023 |
| Gulbay Ltd | Real estate | 2008 |
| Gumtree 4X4 Limited | Wholesale & retail | 2001 |
| Gunn Property Investments Limited | Real estate | 2024 |
| Gunton Limited | Professional & scientific | 2018 |
| Guston C Solar Farm Limited | Energy | 2013 |
| Gutu Properties Limited | Real estate | 2009 |
| GUY Paterson Films Ltd | Information & communication | 2009 |
| GW Motor Group Ltd | Wholesale & retail | 2025 |
| Gwelo Properties Limited | Real estate | 2009 |
| Gweru Investments Limited | Real estate | 2009 |
| GWP Investments Limited | Financial services | 2014 |
| GYE Services Ltd | Health & social care | 2023 |
| H & B Studios Ltd | Arts & recreation | 2018 |
| H J ADU & Sons Ltd | Health & social care | 2011 |
| H Kirby Building Services Limited | Construction | 2003 |
| H L Motors Ltd | Administrative & support | 2015 |
| H Maxi Consulting Ltd | Administrative & support | 2023 |
| H Technician Ltd | Professional & scientific | 2019 |