| Garrison Hill Management Company Limited | Households | 2019 |
| Gas-Electrical-Plumbing Services Ltd | Construction | 2014 |
| Gasman Direct Ltd | Construction | 2022 |
| Gatehouse Mews Management Company Limited | Households | 2000 |
| Gatemaster Ltd | Manufacturing | 2015 |
| Gayle Hamblin Limited | Health & social care | 2012 |
| Gazell Holdings Limited | Financial services | 2022 |
| GB Cartridges Ltd | Wholesale & retail | 2019 |
| GBG Roofing & Building Ltd | Construction | 2016 |
| Gcmhh Limited | Hospitality | 2024 |
| GD Composites Ltd | Manufacturing | 2026 |
| GDS (South Coast) Ltd | Construction | 2026 |
| Gemini Maintenance Services Limited | Real estate | 1980 |
| George 4 Building Projects Ltd | Construction | 2007 |
| George IVY Ltd | Professional & scientific | 2023 |
| Germane Consulting Ltd | Professional & scientific | 2025 |
| GFL Services Ltd | Administrative & support | 2017 |
| GH Vinyl Ltd | Professional & scientific | 2023 |
| Gifts for Life Enterprise Ltd | Wholesale & retail | 2015 |
| Giftsource Ltd | Wholesale & retail | 2024 |
| Gilbert & Holle Moving Co. Ltd | Transport & logistics | 2026 |
| Gilway Brickwork Ltd | Construction | 2026 |
| Gios Catering Ltd | Hospitality | 2023 |
| Giraffe Accountants Limited | Professional & scientific | 2024 |
| GJN Live Limited | Information & communication | 2024 |
| Gladdish & Sons Ltd | Construction | 2020 |
| Gladiator Cleaning Ltd | Administrative & support | 2014 |
| Gladiator Group Ltd | Financial services | 2020 |
| Gladiator Productions Ltd | Information & communication | 2015 |
| Glascrete Limited | Wholesale & retail | 2015 |
| Glazing Solutions (Sussex) Ltd | Construction | 2019 |
| Global Health Film Initiative | Other services | 2016 |
| Global Phoenix Solutions Ltd | Information & communication | 2023 |
| Global Scaffolding (Sussex) Limited | Construction | 2004 |
| Globalised Events Limited | Professional & scientific | 2024 |
| Glorious Landscapes Ltd | Administrative & support | 2022 |
| Glorious Ponds Ltd | Professional & scientific | 2019 |
| Gloucester (Lettings and Management) Limited | Hospitality | 2019 |
| GM Design & Print (Bognor Regis) | | 1994 |
| GM Repointing Ltd | Construction | 2023 |
| Gmac Consultancy Services Limited | Construction | 2023 |
| GMT Markets Ltd | Real estate | 2019 |
| Goat Barbers Z Ltd | Other services | 2026 |
| Goddard House Limited | Real estate | 2022 |
| Godders Limited | Professional & scientific | 2010 |
| Gold Skye Properties Ltd | Real estate | 2024 |
| Golden Blade Turkish Barber Ltd | Other services | 2019 |
| Goldstein Music Limited | Information & communication | 2025 |
| Good Homes Alliance CIC | Professional & scientific | 2007 |
| Goodchild Wholesale Limited | Wholesale & retail | 2025 |
| Goodliffe Developments Limited | Construction | 2011 |
| Goodliffe Estates Limited | Construction | 2011 |
| Goodliffe Properties Limited | Construction | 1934 |
| Goodman & Vinciguerra Investments Ltd | Real estate | 2021 |
| Goodwood Conservatories Limited | Construction | 2011 |
| Goodwood Orangeries & Conservatories Ltd | Wholesale & retail | 2016 |
| Goodwood Orangeries Limited | Wholesale & retail | 2016 |
| Gopro Embroidery & Print Limited | Manufacturing | 2019 |
| Gordo UK Limited | Hospitality | 2023 |
| Gordon Avenue Vehicle Services Ltd | Wholesale & retail | 2010 |
| Gorgeous Hair Design Limited | Other services | 2010 |
| Gosden Green (Southbourne) Management Company Limited | Households | 2016 |
| Gracey Property Services Limited | Real estate | 2002 |
| Gradena Ltd | Professional & scientific | 2014 |
| Graffham Close Freehold Limited | Real estate | 2013 |
| Graffiti Street Limited | Wholesale & retail | 2015 |
| Grandads BIT on the Side Ltd | Wholesale & retail | 2024 |
| Grandads Front Room CIC | Wholesale & retail | 2016 |
| Grandmaaga Ltd | Administrative & support | 2020 |
| Grange Way Management Company Limited | Households | 1984 |
| Grangewood 2004 Limited | Households | 2004 |
| Grape & Vine Bar & Rooms Ltd | Wholesale & retail | 2021 |
| Grays Transport Services ( London ) Limited | Transport & logistics | 2012 |
| Greedy Piglet Ltd | Wholesale & retail | 2019 |
| Green BUG Adventures Ltd | Transport & logistics | 2025 |
| Green Dentistry UK Ltd. | Professional & scientific | 2020 |
| Green Meadow Caravans Limited | Administrative & support | 2021 |
| Green Pelican Ltd | Professional & scientific | 2022 |
| Green Racing Ltd | Professional & scientific | 2023 |
| Green Rainbow Ltd | Information & communication | 2011 |
| Green Retreats Landscapes Ltd | Professional & scientific | 2015 |
| Green River Doors (UK) Ltd. | Manufacturing | 2007 |
| Green Tech Automotive Ltd | Professional & scientific | 2022 |
| Green Thumb Gurus Limited | Administrative & support | 2025 |
| Greenhurst Care Limited | Health & social care | 2013 |
| Greenkeepers Grounds Maintenance & Treecare Ltd | Agriculture & fishing | 2025 |
| Greenman Carpentry Co Limited | Construction | 2010 |
| Greenwood Archery Limited | Arts & recreation | 2014 |
| Greer Works Limited | Real estate | 2021 |
| Greyfriars Management Ltd | Real estate | 2026 |
| Greyfriars Recruitment Ltd | Health & social care | 2025 |
| Greyfriars Training Ltd | Education | 2025 |
| Groove LAB Kids Ltd | Education | 2026 |
| Groves Gardening & Maintenance Ltd | Professional & scientific | 2026 |
| Grow Construction JV Limited | Construction | 2025 |
| GRT Electrical Ltd | Construction | 2016 |
| GRW Financial Limited | Financial services | 2025 |
| GT Build Ltd | Construction | 2020 |
| GT Center Limited | Wholesale & retail | 2025 |
| GTW Services Ltd | Other services | 2023 |