| Go-Cloud Solutions Limited | Information & communication | 2017 |
| Goalsfirst Limited | Professional & scientific | 2017 |
| Golden Escape International Group Ltd | Administrative & support | 2021 |
| Goldrock Consultancy Limited | Professional & scientific | 2024 |
| Goldrose Consultancy Limited | Professional & scientific | 2024 |
| Goldrush AI Solutions Ltd | Information & communication | 2026 |
| Golfing Miracles Limited | Wholesale & retail | 2008 |
| Goral Mead Management Limited | Households | 1984 |
| Gordice Gracious Ltd | Real estate | 2020 |
| Gotitlefree Ltd | Administrative & support | 2025 |
| GPO Health IT Specialists Ltd | Administrative & support | 2020 |
| Grace Alexandra Limited | Construction | 2016 |
| Grace's Blankets Ltd | Wholesale & retail | 2023 |
| Gran Properties Ltd | Real estate | 2015 |
| Grand Union Farm Ltd | Agriculture & fishing | 2016 |
| Grange Ealing Limited | Construction | 2021 |
| Grange W5 Limited | Real estate | 2024 |
| Grant Hammond Consulting Limited | Information & communication | 2008 |
| Grape Lane Pictures Limited | Professional & scientific | 2017 |
| Graphene Design & Build Limited | Construction | 2016 |
| Gratitude Homes Limited | Real estate | 2016 |
| Greater London Locksmiths Limited | Construction | 2004 |
| Greek Food Ambassadors Ltd | Hospitality | 2020 |
| Green Badger Limited | Manufacturing | 2015 |
| Green Bay Investments Limited | Real estate | 2024 |
| Green Build Environmental Limited | Water & waste | 2013 |
| Green Focus Catering Ltd | Hospitality | 2023 |
| Green Hermit Limited | Administrative & support | 2016 |
| Green Installations Ltd | Transport & logistics | 2003 |
| Green Lane Chertsey Limited | Real estate | 2018 |
| Green Stone Investments Limited | Education | 2005 |
| Green Valley Consulting Limited | Professional & scientific | 2014 |
| Greengrow Construction Ltd | Construction | 2024 |
| Greenio Limited | Professional & scientific | 2013 |
| Greenpiste Sports Ltd | Wholesale & retail | 2007 |
| Greenright Garden Services Limited | Professional & scientific | 2009 |
| Greenway Apartments Limited | Hospitality | 2008 |
| Greenway Fields Limited | Real estate | 2011 |
| Greg Crawford Consulting Ltd | Professional & scientific | 2025 |
| Grey OWL Consulting Limited | Real estate | 2023 |
| Grid Edge Policy Limited | Professional & scientific | 2016 |
| Grid Energizer Ltd | Energy | 2017 |
| Griffin Plastering Limited | Construction | 2022 |
| Grimm Transfer Limited | Transport & logistics | 2018 |
| Gripland Ltd | Information & communication | 2021 |
| Grocer on the Green Limited | Administrative & support | 2008 |
| Grooms Investments Ltd | Real estate | 2012 |
| Groveland Properties Ltd | Real estate | 2022 |
| Growing Hearts Ltd | Administrative & support | 2022 |
| Gryffindor ROW Ltd | Real estate | 2026 |
| GSJ FIC Ltd | Financial services | 2023 |
| GTK Developments Ltd | Real estate | 2019 |
| GW Roofing & Building Limited | Construction | 2006 |
| GWL Investments Limited | Real estate | 2019 |
| GWL Properties Limited | Real estate | 2014 |
| GY Labs Ltd | Information & communication | 2026 |
| Gyana Solutions Limited | Other services | 2018 |
| GZB Investments Ltd | Real estate | 2025 |
| H & a Rental Properties Limited | Real estate | 2024 |
| H & H News & Wine Ltd | Wholesale & retail | 2024 |
| H & S Barbers Ltd | Other services | 2018 |
| H Plans Limited | Professional & scientific | 2010 |
| H Staples Ltd | Information & communication | 2019 |
| H W Clinic Limited | Health & social care | 2020 |
| H&S Traders Ltd | Wholesale & retail | 2020 |
| H-Jag Ltd | Professional & scientific | 2018 |
| H.S. Drinks Limited | Transport & logistics | 2002 |
| HA9 Consultancy Limited | Professional & scientific | 2014 |
| Habibi Chai Ltd | Information & communication | 2024 |
| Hadassah Services Ltd | Health & social care | 2009 |
| Haines Prestige Ltd | Transport & logistics | 2023 |
| Haines Property Holdings Ltd | Real estate | 2025 |
| Haines Property Portfolio Ltd | Construction | 2023 |
| Haines Residential Developments Ltd | Construction | 2019 |
| Hair by Jools Ltd | Other services | 2023 |
| Haircuts of Marylebone Limited | Other services | 2017 |
| Hairshare (Harrow) Limited | Other services | 2018 |
| Hairshare (Kings Lynn) Limited | Other services | 2018 |
| Halcad Services Ltd | Information & communication | 2017 |
| Hale Environments Ltd | Wholesale & retail | 2023 |
| Halfway House Corporation Limited | Hospitality | 2024 |
| Hall-Gink Ltd | Professional & scientific | 2025 |
| Hallbright Ltd | Real estate | 2023 |
| Halopup Ltd | Information & communication | 2024 |
| Halt Property Company Limited | Real estate | 1958 |
| Hamer Electrical Contractors Limited | Construction | 1977 |
| Hamko Europe Ltd | Wholesale & retail | 2013 |
| Hampshire Party Pods Limited | Administrative & support | 2021 |
| Hanu CLO Limited | Wholesale & retail | 2026 |
| Hapa Homes Limited | Real estate | 2017 |
| Happy Chatty Speech Therapy Ltd | Education | 2022 |
| Happy Teeth (NW) Limited | Health & social care | 2019 |
| Happylander Ltd | Information & communication | 2011 |
| Hard and Shiny Ltd | Professional & scientific | 2008 |
| Hardware for Croxley Limited | Wholesale & retail | 2022 |
| Harefield Court RTM Company Ltd | Households | 2025 |
| Harefield Gymnastics & Dance Limited | Arts & recreation | 2019 |
| Harefield Honeybees Day Nursery Limited | Health & social care | 2025 |
| Harley Street Andrology Ltd | Professional & scientific | 2016 |
| Harpenden Developers Limited | Real estate | 2021 |