| Grafton Court (Eastbourne) Management Company Limited | Households | 1981 |
| Graham Clark Carpentry Ltd | Construction | 2022 |
| Grammar London Limited | Real estate | 2019 |
| Grampian Property Services Limited | Real estate | 2018 |
| Grandbay Healthcare Limited | Health & social care | 2022 |
| Grandbourne Limited | Households | 2019 |
| Grandcourt (Eastbourne) Limited | Households | 1982 |
| Grange Court Management Company (Eastbourne) Limited | Households | 1978 |
| Grange Property Company Limited | Households | 1990 |
| Grant Wealth Management Limited | Administrative & support | 2008 |
| Grants (Eastbourne) Limited | Administrative & support | 2002 |
| Graphite Services Ltd | Construction | 2022 |
| Grapplers Guild Ltd | Education | 2025 |
| Grassington Mews Residents Company Limited | Households | 2003 |
| Grateful Minds Ltd | Wholesale & retail | 2026 |
| Gratitude Lifestyle Limited | Wholesale & retail | 2014 |
| Gratton Court Residents Company Limited | Households | 1974 |
| Great Greek Cuisine Ltd | Hospitality | 2015 |
| Great House Events Limited | Hospitality | 2011 |
| Great Stockings Limited | Agriculture & fishing | 2025 |
| Greatheart (UK) Holdings Limited | Financial services | 2014 |
| Greatheart (UK) Limited | Financial services | 2014 |
| Greebo Ltd | Information & communication | 2026 |
| Greek GM Ltd | Hospitality | 2025 |
| Greek Goddess Property Limited | Real estate | 2025 |
| Green Boots Ltd | Construction | 2017 |
| Green Electricians Limited | Construction | 2018 |
| Green Financial Planning Limited | Other services | 2013 |
| Green Firma Ltd | Extraterritorial | 2020 |
| Green Oak Home Education Limited | Education | 2025 |
| Green Rock Investments Limited | Financial services | 2011 |
| Green Room Options Limited | Financial services | 2008 |
| Green ROW Communications Limited | Professional & scientific | 2005 |
| Green Shield Sips Limited | Construction | 2025 |
| Green Street Kitchen Limited | Hospitality | 2021 |
| Green Tea Property Ltd | Real estate | 2011 |
| Green UP Your Space Ltd | Wholesale & retail | 2026 |
| Greenfield Preston Park Limited | Administrative & support | 2006 |
| Greenhill Finishers Limited | Manufacturing | 2004 |
| Greenhill Sussex Limited | Manufacturing | 2013 |
| Greensward Property Ltd | Real estate | 2019 |
| Greenway GKL Ltd | Construction | 2010 |
| Greenwich Cakes Limited | Wholesale & retail | 2024 |
| Greenwich House Management Company Limited | Households | 1992 |
| Greenwood Homes Ltd | Real estate | 2025 |
| Greg Laye Limited | Professional & scientific | 2000 |
| Greystacks Limited | Real estate | 2010 |
| Griffiths Knight Case Management Limited | Health & social care | 2017 |
| Grimley Flooring Limited | Construction | 2023 |
| Grimoire Mathematica Ltd | Information & communication | 2025 |
| Gripx Ltd | Wholesale & retail | 2026 |
| GRM Energy Consultancy Limited | Construction | 2015 |
| Grob & Co Holdings Limited | Financial services | 2021 |
| Groombridge Sussex Ltd | Wholesale & retail | 2010 |
| Ground Screw Innovations Ltd | Construction | 2026 |
| Group Travel Organiser Limited | Information & communication | 2008 |
| Group X Digital Ltd | Professional & scientific | 2019 |
| Groves & Partners Eastbourne Limited | Real estate | 2003 |
| Growequal Limited | Manufacturing | 2026 |
| Growth Square Limited | Real estate | 2022 |
| Grra Ltd | Real estate | 2022 |
| Grub Club 1 Ltd | Hospitality | 2025 |
| Grumpy Gull Limited | Wholesale & retail | 2025 |
| Grun Haus Ltd | Construction | 2023 |
| GSF Healthcare Ltd | Health & social care | 2024 |
| Gspj Ltd | Wholesale & retail | 2025 |
| GTD Group Limited | Wholesale & retail | 2017 |
| GTM Boost Ltd | Professional & scientific | 2025 |
| Guardswell Cleaning Ltd | Administrative & support | 2019 |
| Guest Finance Limited | Wholesale & retail | 2025 |
| Guided Wealth Limited | Professional & scientific | 2012 |
| Guild of Energists Ltd | Other services | 2012 |
| Gulevskis Limited | Professional & scientific | 2023 |
| Gulliver Engineering Ltd | Other services | 2000 |
| GUN and Pedal Ltd | Arts & recreation | 2015 |
| GUN Hill Properties Ltd | Real estate | 2023 |
| Gunna's Dream Limited | Wholesale & retail | 2023 |
| Gutsy Design Ltd. | Administrative & support | 2016 |
| Guttering Services Limited | Administrative & support | 2025 |
| GUY Lloyd Cardiac Services Ltd | Health & social care | 2011 |
| GV Music Group Ltd | Wholesale & retail | 2026 |
| GW Catering Sussex Limited | Hospitality | 2022 |
| Gwendon Limited | Extraterritorial | 2007 |
| GWL Dining Ltd | Hospitality | 2024 |
| Gyancore Ltd | Information & communication | 2022 |
| GZ Healthcare Digital Solutions Ltd | Health & social care | 2025 |
| Gözen Law Limited | Information & communication | 2025 |
| H & D Redman (Grocers) Limited | Wholesale & retail | 1997 |
| H & D Redman Limited | Real estate | 1964 |
| H & M Property Developments Limited | Construction | 2004 |
| H Adetola Limited | Health & social care | 2023 |
| H Capital Ventures Ltd | Financial services | 2026 |
| H R Commodities Ltd | Wholesale & retail | 2020 |
| H&H Cigar House Ltd | Wholesale & retail | 2026 |
| H&M Building Innovations Ltd | Construction | 2024 |
| H.E.M. Works Limited | Professional & scientific | 2025 |
| H.G.P. Limited | Other services | 1912 |
| H.M.Serenity Limited | Health & social care | 2022 |
| Haban Ltd | Professional & scientific | 2012 |
| Habari Ltd | Real estate | 2011 |