| GB Roofing and Lead Welding Specialist Limited | Construction | 2025 |
| GB Tyres (Taunton) Limited | Wholesale & retail | 2007 |
| Gbmedics Ltd | Extraterritorial | 2022 |
| GC Drives Ltd | Professional & scientific | 2014 |
| GC Electrical & BMS Contractors Ltd | Construction | 2018 |
| GC Global-Drb-Hicom-Financial Muamalat Malasia Berhad Ltd | Financial services | 2025 |
| GC Globalgroup.Co.Uk Ltd | Financial services | 2024 |
| GC Roofing (South West) Limited | Construction | 2025 |
| Gcgp Properties Limited | Construction | 2013 |
| GD Media Limited | Professional & scientific | 2024 |
| GD Systems (UK) Limited | Construction | 2005 |
| Gecko Cars Ltd | Manufacturing | 2025 |
| Gecko Energy Ltd | Wholesale & retail | 2011 |
| GED Kennett - Contemporary Metals Limited | Manufacturing | 2009 |
| Geela Accountancy Limited | Professional & scientific | 2012 |
| Geela Associates Limited | Administrative & support | 1981 |
| Gelderman Bogaard LLP | | 2011 |
| Gelrorum Ltd. | Administrative & support | 2005 |
| GEM UK Transport Ltd | Transport & logistics | 2019 |
| Gemini Carnival Club C.I.C. | Other services | 2024 |
| Generation Delights Ltd | Wholesale & retail | 2019 |
| Genesis Wealth Consultancy Ltd | Financial services | 2021 |
| Genius Interims Ltd | Professional & scientific | 2008 |
| Genius PR & Events Limited | Arts & recreation | 2014 |
| Geo-Sea Solutions Limited | Professional & scientific | 2007 |
| Geoluminous Co. Ltd | Information & communication | 2021 |
| George Stanley Accountants Ltd | Professional & scientific | 2024 |
| Georgie Lack Development Limited | Professional & scientific | 2009 |
| Geotechnical and Structural Instrumentation and Monitoring Limited | Construction | 2018 |
| Geraghty Medical Ltd | Health & social care | 2009 |
| Gerbestone Management Company Limited | Households | 2016 |
| Gerring Agri Limited | Agriculture & fishing | 2025 |
| GES Research & Media Services Limited | Information & communication | 2024 |
| Getedge Payments Ltd | Information & communication | 2021 |
| Getsetpet Ltd | Wholesale & retail | 2019 |
| GF Enterprises Ltd | Real estate | 2018 |
| GG Dewsbury Limited | Real estate | 2010 |
| GG Films Limited | Information & communication | 2015 |
| GH Installations Limited | Construction | 2017 |
| GHJ Groundworks Ltd | Construction | 2012 |
| Gibb's Plantation Management Company Limited | Households | 2019 |
| Gibbins & Wilding Limited | Information & communication | 1991 |
| Gibbins Richards Estate Agents Limited | Real estate | 2019 |
| Gibbs Bros.(Marston Magna)Limited | Real estate | 1954 |
| Gideon Care Ltd | Administrative & support | 2026 |
| Gigha Star Limited | Professional & scientific | 2020 |
| Gigis Floris Limited | Hospitality | 2018 |
| GIL Riley Equine Vets Limited | Professional & scientific | 2022 |
| GIL Silva Ltd | Wholesale & retail | 2022 |
| Gilbern Owners Club Limited | Wholesale & retail | 1979 |
| Gilchrist Partnership LLP | | 2004 |
| Gilda Limited | Manufacturing | 2002 |
| Giles Brothers Limited | Agriculture & fishing | 2015 |
| Gimme the Paws Limited | Financial services | 2021 |
| Ginasig Limited | Health & social care | 2014 |
| Ginger Bear Creative (GBC) Ltd. | Information & communication | 2016 |
| Ginger P Limited | Other services | 2020 |
| Gingercat Technologies Limited | Information & communication | 2001 |
| Giveaway Guys Ltd | Arts & recreation | 2024 |
| Gixer Ltd | Professional & scientific | 2024 |
| GJB 2 Limited | Professional & scientific | 2019 |
| GK Care Ltd | Health & social care | 2014 |
| GK Fire & Security Ltd | Administrative & support | 2013 |
| GKI Property Limited | Real estate | 2016 |
| GKI Sporting Investments Limited | Administrative & support | 2022 |
| GKM Properties Ltd | Real estate | 2017 |
| GL Francisco Ltd | Health & social care | 2021 |
| Gladstok Limited | Wholesale & retail | 2016 |
| Gladstone Fire Limited | Public administration | 2026 |
| Glam Properties Somerset Ltd | Real estate | 2021 |
| Glam-E LAB Ltd | Administrative & support | 2021 |
| Glass ACT Window Cleaning Ltd | Administrative & support | 2024 |
| Glassworks (Taunton) Limited | Construction | 2015 |
| Glastonbury Motor Body Repairs Limited | Wholesale & retail | 1964 |
| Gleam Commercial Window Cleaning Limited | Administrative & support | 2023 |
| Gleam Window Cleaning South West Limited | Administrative & support | 2026 |
| Glenconnel Ltd | Professional & scientific | 2016 |
| Glencorse Consulting Ltd | Professional & scientific | 2021 |
| Glencott Farm Limited | Agriculture & fishing | 2026 |
| Glendinning Gardens Management Company Limited | Households | 2006 |
| Glenmore Bakery Limited | Manufacturing | 2021 |
| Glenmore Court (Minehead) Limited | Households | 1973 |
| Global Berry Ltd | Real estate | 2013 |
| Global Designs Fenton Limited | Wholesale & retail | 2018 |
| Global Human Innovation Technologies Ltd | Information & communication | 2020 |
| Global Watch Dealers Limited | Wholesale & retail | 2018 |
| Globalcode Developers Limited | Information & communication | 2025 |
| Globella Consultancy Ltd | Professional & scientific | 2025 |
| Globeserv Consulting Limited | Wholesale & retail | 2015 |
| Globshep Technical Services Ltd | Information & communication | 2024 |
| Globtier UK Limited | Information & communication | 2025 |
| Gloop Enterprises Limited | Hospitality | 2010 |
| Glovetra Limited | Wholesale & retail | 2025 |
| Glowing Grates Limited | Construction | 2016 |
| Glyder Limited | Professional & scientific | 2008 |
| GM Techtronics Limited | Wholesale & retail | 2008 |
| GMG Somerset Limited | Real estate | 2019 |
| GMK Contractors Ltd | Construction | 2020 |
| GMR Design UK Ltd | Wholesale & retail | 2009 |
| GMS Automation and Engineering Ltd | Manufacturing | 2014 |