| FRY Guys Limited | Hospitality | 2025 |
| Fttanning Ltd | Other services | 2025 |
| Full Send South Wales Ltd | Arts & recreation | 2025 |
| Funeral Director Finance Limited | Professional & scientific | 2008 |
| Funky Duck Events Ltd | Other services | 2024 |
| Fusion Surgery Limited | Health & social care | 2021 |
| Future Forming Ltd | Education | 2025 |
| G & H Couriers Ltd | Transport & logistics | 2019 |
| G and D Rees Hospitality Ltd | Hospitality | 2025 |
| G Duggan Commercials Ltd | Wholesale & retail | 2024 |
| G&L Water Services Ltd | Construction | 2026 |
| G.I. JOE Personal Training Ltd | Arts & recreation | 2020 |
| G12 Landscape & Construction Ltd | Administrative & support | 2022 |
| Gaia Group Consultants Limited | Manufacturing | 2016 |
| Gallacher Commercial Flooring Limited | Wholesale & retail | 2018 |
| Garage Drefach Ltd | Wholesale & retail | 2025 |
| Gareth Potter Renovations Ltd | Construction | 2015 |
| Garnffrwd Fishery Limited | Agriculture & fishing | 2025 |
| Garnffrwd Park Ltd | Arts & recreation | 2021 |
| Gary Smith Timberframe Limited | Construction | 2015 |
| GAS Manufacturing Limited | Energy | 2007 |
| GAS Services Network Limited | Construction | 1996 |
| Gateway Resort Ltd | Arts & recreation | 2014 |
| Gavin John Consulting Limited | Information & communication | 2010 |
| GCD Properties Limited | Real estate | 2025 |
| Gearpro Ltd | Manufacturing | 2025 |
| Gelli Logistics Limited | Transport & logistics | 2026 |
| Gemma Edwards Photography Limited | Professional & scientific | 2021 |
| Genflex Limited | Extraterritorial | 2003 |
| GGT Property Limited | Real estate | 2022 |
| Gguard Limited | Manufacturing | 1997 |
| GH Supported Living Limited | Health & social care | 2012 |
| Gifts YOU Desire Ltd | Wholesale & retail | 2024 |
| Gilgarran Consultancy Limited | Professional & scientific | 2018 |
| Gladman Services Ltd. | Wholesale & retail | 2022 |
| Glamorous Cleaning Limited | Administrative & support | 2018 |
| Glanmorfa Assisted Living Ltd | Health & social care | 2025 |
| Glanmorfa Care Home Limited | Health & social care | 2008 |
| Glasbrint Limited | Information & communication | 2023 |
| Glass Slipper Events Ltd | Arts & recreation | 2022 |
| Glass Slipper Parties Ltd | Arts & recreation | 2025 |
| Glassfibre Solutions Ltd | Manufacturing | 2022 |
| Gledronn Ltd | Administrative & support | 1998 |
| Global Konnect Limited | Information & communication | 2006 |
| Global Recruitment Solutions (UK) Ltd | Administrative & support | 2013 |
| Global Television Services Limited | Information & communication | 1992 |
| Gloucester Boutique Homes Limited | Real estate | 2024 |
| Glowynne Properties Limited | Construction | 2026 |
| Glunkhouse Publishing Ltd | Information & communication | 2018 |
| Glyn Y Swisdir 16-20 Limited | Households | 2024 |
| Goblin Ltd | Wholesale & retail | 2021 |
| Goblin Media Network Ltd | Information & communication | 2026 |
| Goblin Wood Ltd | Wholesale & retail | 2018 |
| Gofal Care Limited | Public administration | 2023 |
| Gofal Plantos Prysur Childcare CYF. | Health & social care | 2022 |
| Golden & Star Limited | Hospitality | 2024 |
| Golden Break Music Limited | Information & communication | 1990 |
| Golden Cobra Limited | Arts & recreation | 2020 |
| Golden Lettings Limited | Real estate | 2016 |
| Golden Pavilion Chinese Cuisine Ltd | Hospitality | 2025 |
| Golden WOK 828 Limited | Hospitality | 2024 |
| Goodwood Originals Ltd | Manufacturing | 2015 |
| Goose Squad Lifting and Sporting Club Ltd | Manufacturing | 2026 |
| Gorilla Tree Property Ltd | Real estate | 2025 |
| Gorsddu Land Limited | Real estate | 2009 |
| Gorslas Mini Buses Limited | Transport & logistics | 2003 |
| Gorslas Property Maintenance Ltd | Households | 2013 |
| Goshen Health Ltd | Health & social care | 2020 |
| Gower Automotive Engineers Ltd | Wholesale & retail | 2017 |
| Gower Breaks Limited | Hospitality | 2024 |
| Gower Glampervans Ltd | Hospitality | 2020 |
| Gower Ice Cream Ltd | Hospitality | 2016 |
| Gower Marine Limited | Manufacturing | 2026 |
| Gower Riding Club Ltd | Arts & recreation | 2024 |
| Gower Tarmac Ltd | Construction | 2025 |
| Grace Alan Homes Limited | Real estate | 2023 |
| Grace Care Professionals Limited | Health & social care | 2017 |
| Grade Consulting Limited | Construction | 2019 |
| Gravel Works Ltd | Water & waste | 2014 |
| Gravelle Thorne Limited | Wholesale & retail | 2013 |
| Gravells Pharmacy Limited | Wholesale & retail | 2006 |
| Great Outdoors Superstore Limited | Wholesale & retail | 2010 |
| Green Foot Renewables Ltd | Professional & scientific | 2023 |
| Green Oaks Logistics Ltd | Transport & logistics | 2023 |
| Greenfinch Garden Nursery Ltd | Wholesale & retail | 2025 |
| Greenvale Domestics Limited | Households | 2018 |
| Greenways Electrical Ltd | Construction | 2014 |
| Greenways Electrical Testing Limited | Manufacturing | 2018 |
| Greenwell Power Tools Limited | Other services | 2025 |
| Grey Home Properties Limited | Real estate | 2020 |
| Grey Orchid Properties Ltd | Real estate | 2020 |
| Griffiths Developments West Wales Ltd | Construction | 2025 |
| Griffiths Jones Development Ltd | Construction | 2016 |
| Griffx Ltd | Professional & scientific | 2026 |
| Groom Elec Ltd | Manufacturing | 2024 |
| GS6 Developments Ltd | Construction | 2018 |
| GT Fabrications & Ironworks Ltd | Manufacturing | 2019 |
| Gustmain Limited | Manufacturing | 1973 |
| Guys 'N' Dolls at Alex's Hair Salon Ltd | Other services | 2017 |
| GVT Holdings Limited | Financial services | 2022 |