| Galaxsea Divers Ltd | Construction | 2001 |
| Galiots Mersea Limited | Real estate | 1994 |
| Galladen Ltd | Arts & recreation | 2021 |
| Gallery Gallery Ltd | Wholesale & retail | 2024 |
| Galleywood Garage Ltd | Wholesale & retail | 2025 |
| Galvanize Contracts Ltd | Construction | 2015 |
| Gama Property Solutions Ltd | Construction | 2023 |
| Gamatec Ltd | Information & communication | 2016 |
| Game Estate Agents Ltd | Real estate | 2007 |
| Game Estates Ltd | Real estate | 2022 |
| Gamechanger Investments Ltd | Financial services | 2024 |
| Gamekeepers Properties Limited | Real estate | 2025 |
| Gandys International Limited | Wholesale & retail | 2015 |
| GAP Interior Images Ltd | Arts & recreation | 2008 |
| GAP Photos Ltd | Arts & recreation | 2005 |
| Garbo Intelligence & Advisory Ltd | Professional & scientific | 2023 |
| Garbuja Property Service Limited | Real estate | 2023 |
| Garden Maintenance & Design Ltd | Administrative & support | 2021 |
| Gardencinemacompany Ltd | Administrative & support | 2024 |
| Gardenco Ltd | Hospitality | 2023 |
| Gardener Holdings Ltd | Financial services | 2017 |
| Gardener Properties Ltd | Real estate | 2017 |
| Gardenfirst Ltd | Real estate | 2022 |
| Gardenfurnitureuk Ltd | Wholesale & retail | 2016 |
| Gardening Around Ltd | Administrative & support | 2019 |
| Gardiner Management Ltd | Professional & scientific | 2023 |
| Garipelli's Properties Ltd | Real estate | 2026 |
| Garland Environmental Services Limited | Professional & scientific | 2005 |
| Garlands Consulting Limited | Professional & scientific | 2009 |
| Garne's Capital Limited | Real estate | 2026 |
| Garner Construction Limited | Construction | 2020 |
| Garner Properties Ltd | Financial services | 2019 |
| Garnet Residential Limited | Real estate | 1994 |
| Garrison Limited | Administrative & support | 2015 |
| Gary F Moore Labour Railway Services Ltd | Construction | 2019 |
| Gary Jobber Woodworking & Construction Ltd | Construction | 2013 |
| Gary Reeve Design Limited | Administrative & support | 2015 |
| GAS 24 U Ltd | Construction | 2017 |
| GAS Health Ltd | Construction | 2025 |
| GAS Holdings Ltd | Financial services | 2022 |
| Gasolini Automotive Ltd | Manufacturing | 2025 |
| Gastroenterology Consulting Limited | Health & social care | 2021 |
| GAT Utilities Limited | Energy | 2025 |
| Gatekeeper Limited | Extraterritorial | 1999 |
| Gatelodge Rural Business Support Ltd | Professional & scientific | 2024 |
| Gateway Assessments & Consultancy Limited | Administrative & support | 2012 |
| Gateway Qualifications Limited | Education | 2005 |
| Gatsby Media Limited | Information & communication | 2021 |
| Gatsby Productions Limited | Information & communication | 2021 |
| Gatzoulis Company Limited | Wholesale & retail | 2023 |
| Gatzoulis Media Ltd | Information & communication | 2023 |
| Gavin Adams Limited | Agriculture & fishing | 2002 |
| Gavin Way RTM Company Limited | Households | 2014 |
| Gazellerise Coaching & Consulting Ltd | Administrative & support | 2025 |
| GB Bootcamp Colchester Ltd | Arts & recreation | 2022 |
| GB Legends Ltd | Professional & scientific | 2020 |
| Gblink Ltd | Transport & logistics | 2020 |
| GBO Property Ltd | Real estate | 2025 |
| GBT Painting & Decorating Ltd | Construction | 2020 |
| GBW Services Limited | Manufacturing | 2019 |
| Gcdm Ltd | Professional & scientific | 2022 |
| GCL Coach House Development Ltd | Real estate | 2017 |
| GCS (UK) Limited | Wholesale & retail | 2001 |
| GCS Hospitality Solutions Ltd | Hospitality | 2022 |
| GCS Property Holdings Ltd. | Real estate | 2021 |
| GD Cuisine Limited | Manufacturing | 2007 |
| GD Massey Residential Ltd | Real estate | 2019 |
| Gdxjb Solutions Limited | Professional & scientific | 2026 |
| GE Product Design Ltd | Professional & scientific | 2014 |
| Ge-First Healthcare Limited | Health & social care | 2022 |
| Gecko Electrical Services Ltd | Construction | 2018 |
| GED Consultancy Services LLP | | 2012 |
| Geditsoft Ltd | Information & communication | 2026 |
| Geeks and Games Limited | Wholesale & retail | 2025 |
| Gefmtrans Ltd | Transport & logistics | 2024 |
| Gelert Global Advisory Ltd | Administrative & support | 2024 |
| GEM Car Sales Ltd | Wholesale & retail | 2011 |
| GEM Exterior Cleaning Ltd | Administrative & support | 2024 |
| Gemdarr Ltd | Professional & scientific | 2023 |
| Gemini Glazing Ltd | Construction | 2023 |
| Gemini House Property Management Limited | Real estate | 2015 |
| Gemini Medical Ltd | Health & social care | 2010 |
| Gemini Merchant Ltd | Wholesale & retail | 2025 |
| Gemstone Commercial Limited | Financial services | 2022 |
| Gemstone Mortgages Ltd | Financial services | 2016 |
| Gemula Consulting Ltd | Professional & scientific | 2022 |
| GEN2TEK Ltd | Construction | 2023 |
| GEN70 Property Ltd | Real estate | 2023 |
| Genco Pura Properties Limited | Real estate | 2015 |
| Gencot Limited | Information & communication | 2019 |
| General Cooling Solutions Limited | Financial services | 2025 |
| Generation Roofing & Maintenance Limited | Construction | 2020 |
| Generator Control and Maintenance Ltd | Manufacturing | 2019 |
| Generic Science and Technologies Limited | Professional & scientific | 2003 |
| Genesis Accounting Limited | Professional & scientific | 2004 |
| Genesis Applications Limited | Information & communication | 1994 |
| Genesis Group (GEN) Media, Marketing & Recruitment Limited | Professional & scientific | 2023 |
| Genesis Plant Marketing Limited | Wholesale & retail | 2006 |
| Genesis Rescue Consultancy Ltd | Professional & scientific | 2025 |
| Genex Legal LLP | | 2022 |