| Good Place Comms Limited | Professional & scientific | 2022 |
| Good Ventures Limited | Manufacturing | 2007 |
| Good Vibe Ventures Ltd | Professional & scientific | 2024 |
| Goodacre Delivery Network Ltd | Transport & logistics | 2022 |
| Goodfit Limited | Information & communication | 2020 |
| Goodland Pharma Ltd | Administrative & support | 2024 |
| Goodson Holdings Ltd | Real estate | 2020 |
| Goom Academy Ltd | Education | 2025 |
| Goom Electrical Limited | Construction | 2008 |
| Goorgs Limited | Health & social care | 2026 |
| Goose Freight Ltd | Transport & logistics | 2020 |
| Gorvett & Bailey Limited | Professional & scientific | 2018 |
| Gospel Breakthrough Limited | Arts & recreation | 2019 |
| Gotch Investments Limited | Real estate | 2002 |
| Gotech Consulting Limited | Information & communication | 2022 |
| Gotou UK Ltd | Information & communication | 2025 |
| Goulds Gaffs Ltd | Real estate | 2026 |
| Gourmeet Ltd | Wholesale & retail | 2024 |
| Gourmet Well Limited | Hospitality | 2024 |
| Gowns for Less Ltd | Wholesale & retail | 2024 |
| GP Locum Network Limited | Health & social care | 2012 |
| GP Maintenance and Cleaning Ltd | Construction | 2024 |
| GP Medical Solutions Limited | Health & social care | 2014 |
| GPB Real Estate Limited | Real estate | 2024 |
| GPM Pharma Limited | Wholesale & retail | 2018 |
| Gracefully Wholesome Limited | Health & social care | 2021 |
| Grade One Digital Ltd | Information & communication | 2014 |
| Gradeland Limited | Real estate | 2002 |
| Gradlines Ltd | Information & communication | 2026 |
| Gradzyl Ltd | Information & communication | 2025 |
| Grafon Limited | Extraterritorial | 2012 |
| Graham Mclachlan Consulting Ltd | Information & communication | 2022 |
| Grain Property Limited | Construction | 2022 |
| Grainger West Limited | Administrative & support | 2003 |
| Grand Cholas Ltd | Hospitality | 2025 |
| Grand Hire Herts Ltd | Hospitality | 2025 |
| Grange Court Residents ST Albans Limited | Households | 2008 |
| Grange DCL Ltd | Real estate | 2016 |
| Grange Equity Investments Ltd | Real estate | 2021 |
| Grange Internet Limited | Information & communication | 2020 |
| Grange Real Estate Limited | Financial services | 2015 |
| Grange Topco Ltd | Financial services | 2021 |
| Granola Labs Ltd | Information & communication | 2023 |
| Grants Greener Gardens Limited | Administrative & support | 2002 |
| Grapeviners Ltd | Professional & scientific | 2016 |
| Graphic Rewilding Limited | Extraterritorial | 2024 |
| Graphic Rewilding Merchandise Limited | Wholesale & retail | 2026 |
| Graphy Technologies Ltd | Information & communication | 2019 |
| Grasshopper Coaching Limited | Administrative & support | 2003 |
| Gravitas Gardens Limited | Administrative & support | 2017 |
| Grayde a Tutoring Ltd | Education | 2025 |
| Grazalema Ventures Limited | Information & communication | 2023 |
| Great Blue Wizard Limited | Professional & scientific | 2001 |
| Great Brick Cleaners Ltd | Administrative & support | 2023 |
| Great Companies Consulting Limited | Real estate | 1996 |
| Great Tickets Limited | Administrative & support | 2008 |
| Greatest Ever Lived Ltd | Other services | 2025 |
| Greatheart Nominees Limited | Professional & scientific | 2017 |
| Green Bean Framing Ltd | Wholesale & retail | 2026 |
| Green Bean Memorabilia Ltd | Wholesale & retail | 2020 |
| Green Bean Publishing Ltd | Information & communication | 2020 |
| Green Build (UK) Limited | Construction | 1998 |
| Green Chair Counselling Service Ltd | Other services | 2018 |
| Green Chilli Tree Ltd | Hospitality | 2024 |
| Green Electrical & Maintenance Services Limited | Administrative & support | 2008 |
| Green Frog Marketing Limited | Administrative & support | 1995 |
| Green Gorilla Consultants Ltd | Professional & scientific | 2018 |
| Green Knight Consulting Limited | Professional & scientific | 2024 |
| Green Line Cars ST Albans Limited | Wholesale & retail | 2018 |
| Green Oak House Freehold Limited | Real estate | 2015 |
| Green Park Studio Ltd | Professional & scientific | 2011 |
| Green Planet Holdings Limited | Professional & scientific | 2022 |
| Green Planet Investments Limited | Financial services | 2020 |
| Green Swan Pharmaceuticals Limited | Extraterritorial | 2003 |
| Green Trees Arboriculture Ltd | Agriculture & fishing | 2019 |
| Greenest Grass Limited | Wholesale & retail | 2020 |
| Greenhart Renewables Ltd | Construction | 2026 |
| Greenland Oaks Management NO. 2 Limited | Professional & scientific | 2014 |
| Greenleaf Garden Company Ltd | Administrative & support | 2011 |
| Greensand Professional Services Ltd | Professional & scientific | 2013 |
| Greensleeves Country Clothing Ltd | Wholesale & retail | 2017 |
| Greenthorne Trading Limited | Professional & scientific | 2022 |
| Greenwave Solutions Limited | Other services | 2012 |
| Greenwich Property Development LP | | 2010 |
| Greenzone Environmental Building and Project Services Limited | Other services | 2014 |
| Greenzone Landscapes Limited | Other services | 2014 |
| Greg Mcclarnon Ltd | Extraterritorial | 2023 |
| Grewal Futures Ltd | Administrative & support | 2021 |
| Grey Cat Design Ltd | Professional & scientific | 2013 |
| Griffiths Labour Link Ltd | Administrative & support | 2024 |
| Grill & FRY Limited | Hospitality | 2019 |
| Grimston Trust Limited | Professional & scientific | 1915 |
| Grind ST Albans Limited | Hospitality | 2024 |
| Grip Global Ltd | Information & communication | 2026 |
| Griptite Group Limited | Professional & scientific | 1986 |
| Groody Transport Solutions Ltd | Transport & logistics | 2014 |
| Groom Court Management Company (ST. Albans) Limited | Households | 1996 |
| Groq 10X Opportunity 1 LP | | 2024 |
| Grosvenor Court Limited | Households | 2000 |
| Groundbreak Limited | Construction | 2025 |