| Gallop EAT Limited | Information & communication | 2023 |
| Galway Homes Ltd | Real estate | 2024 |
| Gambit Media Limited | Administrative & support | 2019 |
| Gambit Tradera Ltd | Wholesale & retail | 2023 |
| Game Changer Junkie Ltd | Information & communication | 2018 |
| Game Changer Supplements Limited | Wholesale & retail | 2025 |
| Game Keys Deal Ltd | Wholesale & retail | 2026 |
| Gamlingay Residents Company Limited | Households | 2018 |
| GAN Estates Limited | Real estate | 2021 |
| Ganadores Limited | Professional & scientific | 2011 |
| Gannochy Consulting Ltd | Professional & scientific | 2020 |
| Gano Consulting Limited | Professional & scientific | 2020 |
| GAP Country Homes Ltd | Construction | 2022 |
| GAP Year Sport Limited | Administrative & support | 2004 |
| Gape Properties Ltd | Real estate | 2023 |
| Gape Properties Management Ltd | Real estate | 2025 |
| GAR Capital Limited | Financial services | 2026 |
| GAR Housing Ltd | Real estate | 2026 |
| Garage 41 Motorsports Limited | Other services | 2019 |
| Garage Tyre Services,Limited | Wholesale & retail | 1936 |
| Garagebar Limited | Wholesale & retail | 2019 |
| Garats HAY Residents Company Limited | Households | 2005 |
| Garden and Tree Services Limited | Administrative & support | 2026 |
| Garden of England Sales Ltd | Wholesale & retail | 2012 |
| Garden Sauna Ltd | Manufacturing | 2020 |
| Gardening Direct Marketing Limited | Financial services | 2021 |
| Garfield Builders Limited | Construction | 1976 |
| Garfield Properties Ltd | Real estate | 2018 |
| Garfield Snooker Lounge Ltd | Other services | 2019 |
| Garfield Tyres Ltd | Wholesale & retail | 2022 |
| Garfield Vehicle Solutions Ltd | Transport & logistics | 2022 |
| Garford Farm Machinery Limited | Manufacturing | 2009 |
| Garfords Limited | Construction | 2015 |
| Gargara Limited | Wholesale & retail | 2017 |
| Garner Property Investments 36 Ltd | Real estate | 2026 |
| Garratt Agencies Ltd | Wholesale & retail | 2014 |
| Garrick House Property Management Company Limited | Households | 2015 |
| Gartner Limited | Real estate | 2006 |
| Garton Food Store Ltd | Wholesale & retail | 2021 |
| Garvani Limited | Administrative & support | 2012 |
| Gary Blackbird Limited | Construction | 2018 |
| Gary Cook Stone Masonry Specialists Ltd | Construction | 2018 |
| Gary Mumby Ltd | Manufacturing | 2017 |
| Gary Punter Consultancy Limited | Administrative & support | 2022 |
| Gary White Electrical Services Ltd | Construction | 2022 |
| Garzin Limited | Information & communication | 2018 |
| GAS Faith Ltd | Construction | 2024 |
| GAS Leakage Solutions Limited | Manufacturing | 2017 |
| GAS Pro Engineering Ltd | Construction | 2020 |
| GAS Safe Ltd | Construction | 2025 |
| GAS Sealing Solutions Limited | Manufacturing | 2015 |
| Gasdesign Utilities Ltd | Administrative & support | 2005 |
| Gastronome Restaurants Ltd | Hospitality | 2017 |
| GATEG4 Ltd | Professional & scientific | 2025 |
| Gatekeeper Housing Limited | Real estate | 2024 |
| Gatenotch Property Management Limited | Households | 1999 |
| Gateway Arts Ltd | Administrative & support | 2022 |
| Gateway Recruitment Ltd | Administrative & support | 2021 |
| Gathercole Race Engines Limited | Professional & scientific | 2017 |
| Gats Solutions Ltd | Information & communication | 2019 |
| Gauge Services Limited | Professional & scientific | 2016 |
| Gauntlet Group Limited | Information & communication | 2025 |
| GAW Energies Ltd | Construction | 2023 |
| GB Carpets Ltd | Construction | 2022 |
| GB Events and Parties Ltd | Hospitality | 2023 |
| GB Exim Ltd | Wholesale & retail | 2025 |
| GB Management & Consultancy Services Ltd | Information & communication | 2014 |
| GB Motorhome Tours Limited | Administrative & support | 2015 |
| GB Print Electrical Limited | Manufacturing | 2007 |
| GB Specialist Catering Ltd | Hospitality | 2015 |
| Gbjbmb Limited | Real estate | 2022 |
| Gbmh Ltd | Hospitality | 2025 |
| GBS Trustees Limited | Other services | 2024 |
| GC Elec Holdings Limited | Manufacturing | 2023 |
| GCC Investments (UK) Limited | Real estate | 2003 |
| GCC London Properties Limited | Real estate | 2025 |
| GCC Property Portfolio Limited | Real estate | 2018 |
| Gcdg Dental Limited | Health & social care | 2022 |
| GCP Trading Ltd | Construction | 2003 |
| GD Brickwork Ltd | Construction | 2023 |
| Gdmm Construction Ltd | Construction | 2025 |
| GDN Investments Ltd | Real estate | 2021 |
| GDS Link (UK) Limited | Information & communication | 2012 |
| Gdsl Designs Ltd | Manufacturing | 2017 |
| GE Promotions Ltd | Arts & recreation | 2025 |
| GE Support UK Ltd | Professional & scientific | 2024 |
| GEA Medical Ltd | Professional & scientific | 2024 |
| Geaenterprises Ltd | Health & social care | 2023 |
| Gear&Glory UK Limited | Wholesale & retail | 2025 |
| Gebl Financial Limited | Financial services | 2025 |
| Gebl Group Ltd | Financial services | 2025 |
| Gediminasserys Limited | Transport & logistics | 2016 |
| Gedzjrame Serves Ltd | Administrative & support | 2018 |
| GEE Power CUT Limited | Other services | 2025 |
| Gee's Burger Ltd | Hospitality | 2025 |
| Geek Designs Limited | Information & communication | 2014 |
| Geese Consulting Ltd | Professional & scientific | 2020 |
| Gelcolouruk Ltd | Other services | 2023 |
| GEM Conservation Limited | Construction | 2012 |
| GEM PAD Limited | Real estate | 2023 |