| Golden Joy Services Limited | Health & social care | 2018 |
| Golden Kylin Ltd | Hospitality | 2022 |
| Golden Larch Fencing Ltd | Extraterritorial | 2009 |
| Golden Moments International Ltd. | Administrative & support | 2015 |
| Golden Phoenix (Stanmore) Ltd | Hospitality | 2025 |
| Golden Pond Foods Ltd | Hospitality | 2024 |
| Golden SIX Limited | Construction | 2020 |
| Golden Trans Ltd | Transport & logistics | 2016 |
| Goldfish Jewellery Ltd | Wholesale & retail | 2024 |
| Golding's Holdings Limited | Real estate | 2020 |
| Goldsmiths (Totton) Ltd | Wholesale & retail | 2016 |
| Goldvince UK Ltd | Arts & recreation | 2016 |
| Goldwood Health Ltd | Financial services | 2005 |
| Goldwood Jewellery Ltd | Manufacturing | 2019 |
| Golf Club Recycle Ltd | Wholesale & retail | 2019 |
| Golf Groovy Ltd | Wholesale & retail | 2023 |
| Goliath Securities Ltd | Administrative & support | 2002 |
| Goloco International Ltd | Administrative & support | 2016 |
| GOM Sport & Leisure Limited | Arts & recreation | 2007 |
| Gondola Interiors Ltd | Construction | 2007 |
| Good Directions Limited | Wholesale & retail | 1988 |
| Good English Limited Partnership | | 2019 |
| Good Fortune (Southampton) Ltd | Hospitality | 2023 |
| Good Hope Health Care Limited | Health & social care | 2018 |
| Good Libations Retail Ltd | Hospitality | 2022 |
| Good Vibes Hifi Limited | Manufacturing | 2025 |
| Good Vibes Living Ltd | Real estate | 2023 |
| Good Witch Studio Limited | Information & communication | 2019 |
| Goodburn (Southampton) Management Company Limited | Households | 1988 |
| Goodday Motors Ltd | Wholesale & retail | 2017 |
| Goodfires Chimney Sweeping Ltd | Water & waste | 2012 |
| Goodison Gentry (1878) Limited | Financial services | 2022 |
| Goodman Marine Services Ltd | Manufacturing | 2018 |
| Goodmans Court Management Company Limited | Households | 2017 |
| Goodmove Moving and Storage Limited | Transport & logistics | 1994 |
| Goodness for ALL Ltd | Wholesale & retail | 2025 |
| Goodness Grazers Limited | Hospitality | 2021 |
| Goods First Ltd. | Wholesale & retail | 2012 |
| Goodwill Homes Limited | Construction | 2011 |
| Goodwill Homes SPV Limited | Real estate | 2025 |
| Goodwood Kitchens Ltd. | Manufacturing | 1995 |
| Goody Family Enterprise Limited | Manufacturing | 2013 |
| Goodyer Electrical Ltd | Construction | 2007 |
| Goose Recruitment Limited | Administrative & support | 2018 |
| Goosechase Ltd | Extraterritorial | 2011 |
| Goosey Media Ltd | Information & communication | 2026 |
| Gopack Logistics Ltd | Transport & logistics | 2025 |
| Gordian Corporation Ltd | Extraterritorial | 2022 |
| Gordleton Developments Limited | Construction | 2025 |
| Gordon Brown Associates Limited | Professional & scientific | 2016 |
| Gorgeous by Gizzi Limited | Other services | 2021 |
| Gorkhali Grocers Limited | Wholesale & retail | 2023 |
| Gormstorm Ltd | Financial services | 2025 |
| Gorse Bush 3 Limited | Information & communication | 2019 |
| Goscomb Limited | Extraterritorial | 2012 |
| Gosh Pro Ltd | Construction | 2021 |
| Gosouth GAS Ltd | Construction | 2013 |
| Gosport Estates Limited | Real estate | 1991 |
| Gosport Real Estate Limited | Real estate | 2004 |
| Gotvox Limited | Information & communication | 2014 |
| Gouldian Properties Limited | Real estate | 2024 |
| Goulding and Rabbetts Limited | Other services | 2000 |
| Goumoush-Food Ltd | Hospitality | 2025 |
| GP Brickwork Hampshire Ltd | Construction | 2026 |
| GP Contractors Limited | Construction | 2009 |
| GP Frontline Ltd | Health & social care | 2025 |
| GP Go Ltd | Health & social care | 2026 |
| GP Group Limited | Construction | 2001 |
| GP Masonry Contractors Limited | Construction | 2007 |
| GP Special Projects UK Limited | Construction | 2009 |
| GPL Residents Association (Southampton) Limited | Households | 1996 |
| Gplinkbuilder Ltd | Information & communication | 2025 |
| Gplusa Limited | Extraterritorial | 2024 |
| Gposting IT Firm Ltd | Information & communication | 2024 |
| GPP IT Ltd | Information & communication | 2025 |
| Gptrak Ltd | Information & communication | 2025 |
| Gqual Ltd | Professional & scientific | 2022 |
| GR - Electrical Consulting Services Ltd | Professional & scientific | 2017 |
| GR8GREEN Limited | Wholesale & retail | 2007 |
| GRA Maritime Consultants Limited | Construction | 2016 |
| Grabuk Ltd | Wholesale & retail | 2025 |
| Grace BOS Ltd | Professional & scientific | 2025 |
| Grace Wellness Services Ltd | Real estate | 2015 |
| Gracefield Asset Management Limited | Real estate | 2022 |
| Graceful Community Care Limited | Health & social care | 2025 |
| Gracelands Limited | Construction | 1977 |
| Gracepark Holdings Ltd | Financial services | 2021 |
| Gracevilla Holdings Ltd | Real estate | 2024 |
| Gracewell Staffing Limited | Administrative & support | 2017 |
| Gracimusic Ltd | Information & communication | 2026 |
| Gracious Salon and Cosmetics Ltd | Other services | 2025 |
| Grack Birds Ltd | Information & communication | 2025 |
| Grade A-Team Technical Solutions UK Ltd | Information & communication | 2022 |
| Grademeet Limited | Construction | 1981 |
| Gradient Roofing Services Limited | Construction | 2016 |
| Graft Rope Access Ltd | Construction | 2026 |
| Graham Barker Design Ltd | Construction | 2015 |
| Graham Court (Southampton) Limited | Households | 2016 |
| Graham Harvey & Co Ltd | Professional & scientific | 1999 |
| Graham Howard Catering Limited | Hospitality | 2016 |