| Gason Limited | Wholesale & retail | 2003 |
| Gater Recruitment Limited | Administrative & support | 2022 |
| Gatestone Homes Limited | Real estate | 2023 |
| Gateway (IOW) Ltd | Construction | 2025 |
| Gateway Express (UK) Ltd | Hospitality | 2010 |
| Gateway HSE Solutions Ltd | Public administration | 2020 |
| Gateway NPT Ltd | Administrative & support | 2018 |
| Gateway Support and Care Ltd. | Health & social care | 2004 |
| Gather and Table Ltd | Hospitality | 2025 |
| GATKINSON37 Ltd | Arts & recreation | 2024 |
| Gatsby Platform Ltd | Information & communication | 2022 |
| Gavi Developments Limited | Financial services | 2025 |
| Gavin Tombleson IOW Ltd | Construction | 2026 |
| Gazplast CYF | Construction | 2022 |
| GB David Ltd | Transport & logistics | 2019 |
| GB Dental Therapy Hygiene Services Ltd | Health & social care | 2018 |
| GB Excellence Limited | Financial services | 2022 |
| GBP Skips & Waste Ltd | Water & waste | 2019 |
| GBP Skips Ltd | Water & waste | 2024 |
| Gcappilli Ltd | Manufacturing | 2023 |
| GCE Business Solutions Limited | Administrative & support | 2025 |
| GCS Safety Services Ltd | Construction | 2018 |
| GD Newport Limited | Hospitality | 2023 |
| GD Tool Ltd | Professional & scientific | 2020 |
| GD4 Consultancy Ltd | Professional & scientific | 2025 |
| Gdb-Lettings Ltd | Real estate | 2022 |
| GDS Accountancy Ltd | Professional & scientific | 2020 |
| Gdtb Services Limited | Other services | 2018 |
| GE Pritchard Ltd | Construction | 2015 |
| Gecko Developments and Construction Ltd | Construction | 2024 |
| Gecko Hygiene Ltd | Water & waste | 2007 |
| Geeksome Ltd | Wholesale & retail | 2023 |
| Gejk Limited | Administrative & support | 2015 |
| Gejk Property Limited | Real estate | 2017 |
| Gelato Hub Ltd | Hospitality | 2026 |
| Gelato Newport Ltd | Wholesale & retail | 2021 |
| Gellifawr Woodland Retreat Ltd | Hospitality | 2022 |
| GEM Bespoke Building Services Ltd | Construction | 2025 |
| Gemini Health and Beauty Ltd | Health & social care | 2025 |
| Gemma Feldon Ltd | Professional & scientific | 2014 |
| Gems INK Ltd | Arts & recreation | 2023 |
| General Farming and Contracting GFC Limited | Agriculture & fishing | 2021 |
| Generational Health Ltd | Health & social care | 2026 |
| Genie Collective Ltd | Information & communication | 2026 |
| Genie GAS & Plumbing Limited | Construction | 2015 |
| Genie Lettings Limited | Real estate | 2018 |
| Genpower Fulfilment Ltd | Transport & logistics | 2021 |
| Gensol Engineering Services Ltd | Professional & scientific | 2013 |
| GEO Weeks and Sons Ltd | Arts & recreation | 1962 |
| Geoaly Ltd | Construction | 2018 |
| GEOD92 Ltd | Transport & logistics | 2019 |
| Geoff Leather Ltd | Other services | 1995 |
| Geoff Thomas Limited | Wholesale & retail | 2003 |
| Geoflo Management Limited | Professional & scientific | 2024 |
| Geopelion Ltd | Wholesale & retail | 2023 |
| George Kelson Brickwork Limited | Construction | 2019 |
| George North Limited | Administrative & support | 2010 |
| George Transport 2001 Ltd | Transport & logistics | 2024 |
| Georgy Properties Limited | Real estate | 2023 |
| Geoyou Limited | Information & communication | 2017 |
| GEP Freight Services Ltd | Transport & logistics | 2023 |
| Geraint Clarke Consultancy Limited | Arts & recreation | 2017 |
| Geraint Davies Independent Financial Services Ltd | Financial services | 2010 |
| German Auto Specialist Limited | Wholesale & retail | 2024 |
| Gerrish Holdings Limited | Financial services | 2026 |
| Gerrish Investments Limited | Financial services | 2026 |
| Gerrish Property Co Limited | Real estate | 2026 |
| Gerry Jones Transport Services Limited | Transport & logistics | 1982 |
| GET Training Care and Health Interventions (Getchi) Limited | Administrative & support | 2014 |
| GET Zero Ltd | Construction | 2024 |
| Gezza Ltd | Construction | 2026 |
| GF96 Promotions Limited | Arts & recreation | 2021 |
| GF96 Properties Ltd | Real estate | 2022 |
| GFB Pallets Ltd | Other services | 2023 |
| GFG Engineering Ltd | Construction | 2025 |
| GG Competitions SW Ltd | Other services | 2025 |
| GG2 Newport Limited | Wholesale & retail | 2024 |
| GGS Events Limited | Arts & recreation | 2025 |
| GGS IOW Limited | Hospitality | 2020 |
| GGW Advice Limited | Professional & scientific | 2023 |
| GH Rigging Ltd. | Information & communication | 2020 |
| GHAFF28 Limited | Health & social care | 2021 |
| GHF Developments Limited | Real estate | 2008 |
| Ghoson Security PVT Limited | Administrative & support | 2022 |
| Ghost ENT Ltd | Information & communication | 2023 |
| Ghurazi Trade Limited | Wholesale & retail | 2016 |
| Giant Space Limited | Professional & scientific | 2013 |
| Giantcentre Limited | Arts & recreation | 1992 |
| Giardino Ltd | Hospitality | 2025 |
| Gibacarn Property Ltd | Real estate | 2023 |
| Gibbs (IOW) Ltd | Real estate | 2016 |
| Gibbs Timber Engineering Ltd | Construction | 2011 |
| Gibbs Timber Frame Limited | Manufacturing | 2005 |
| Gibian Communications Limited | Information & communication | 2015 |
| Gibson Girl (UK) Ltd | Arts & recreation | 2011 |
| Gifford Homes and Gardens Limited | Construction | 2002 |
| Giftage Ltd | Wholesale & retail | 2025 |
| Giles Davies Developments Ltd | Construction | 2017 |
| Giles Davies Developments North Ltd | Construction | 2023 |
| Giles Davies Developments South East Ltd | Construction | 2023 |