| Fresco Residential Limited | Real estate | 2018 |
| Frigg Property Ltd | Real estate | 2013 |
| Fsb-Salez Ltd | Professional & scientific | 2025 |
| Fusion Records Ltd | Information & communication | 2011 |
| G.H.Buttle & Co.Limited | Real estate | 1940 |
| G2JF Limited | Professional & scientific | 2019 |
| GAB INT- Wholesale Ltd | Wholesale & retail | 2022 |
| Gabrel Limited | Manufacturing | 1999 |
| Gallery LES Bois Limited | Wholesale & retail | 2024 |
| Gallivant Film Limited | Information & communication | 2014 |
| Gaming Recruitment Solutions Limited | Administrative & support | 2014 |
| Garbin Limited | Professional & scientific | 2022 |
| Gardol Properties Limited | Real estate | 1959 |
| GAS WIZ Ltd | Construction | 2024 |
| Gayle Goldstein Ltd | Administrative & support | 2024 |
| Gdt&T Ltd | Administrative & support | 2019 |
| Gefyra Waterproofing Ltd | Construction | 2023 |
| Gemstone Estates Limited | Construction | 2005 |
| GGP (Three) Limited | Real estate | 2022 |
| GGP (Two) Limited | Construction | 2014 |
| GGP One LLP | | 2014 |
| GI Digi-Comms Solutions Ltd | Professional & scientific | 2023 |
| Gills Hill Limited | Extraterritorial | 2024 |
| Gita Chemist Limited | Wholesale & retail | 1988 |
| Gita Investments Limited | Real estate | 2019 |
| Global Health Research Services Ltd | Professional & scientific | 2018 |
| Global Trading Logistics Ltd | Wholesale & retail | 2023 |
| Globe Drop Limited | Transport & logistics | 2022 |
| Glynn QS Ltd | Construction | 2012 |
| Go-Te Consulting Ltd | Financial services | 2017 |
| Go-Te Technologies Limited | Information & communication | 2018 |
| Goldbond Leisure Limited | Hospitality | 1994 |
| Goldhaven Properties Limited | Real estate | 2008 |
| Golftech Pros Limited | Wholesale & retail | 2019 |
| Goodlinks Residents Limited | Other services | 2005 |
| GP & Taylors Limited | Real estate | 2019 |
| GR Artists Ltd | Other services | 2026 |
| Graham Temple & Company Ltd | Professional & scientific | 2020 |
| Great Reads Limited | Wholesale & retail | 2014 |
| Green Seed Energy Limited | Energy | 2022 |
| Green Vertex Limited | Information & communication | 2022 |
| Greenhexagon Ltd | Professional & scientific | 2025 |
| Grey Butterfly Limited | Financial services | 2022 |
| Grey Butterfly Properties Limited | Real estate | 2022 |
| Grey OWL Holdings Limited | Extraterritorial | 2018 |
| Grilling Games Ltd | Information & communication | 2026 |
| Grinton Consulting Limited | Professional & scientific | 2017 |
| Group 3 Engineering Limited | Professional & scientific | 2024 |
| Grove Fruits Ltd. | Wholesale & retail | 2002 |
| Grove Road Management (Hitchin) Limited | Households | 2005 |
| Grow & Connect CIC | Education | 2024 |
| Gulf Star VIP Ltd | Transport & logistics | 2022 |
| GY Management Services Ltd | Other services | 2015 |
| H S Farm Fresh Ltd | Wholesale & retail | 2021 |
| Hach Building Services Ltd | Construction | 2025 |
| Hach Property Holdings Ltd | Real estate | 2024 |
| Haivaz Ltd | Construction | 2015 |
| Hallwarm Limited | Professional & scientific | 2023 |
| Hamilton House RTM Company Limited | Other services | 2004 |
| Handyitems Ltd | Wholesale & retail | 2025 |
| Happies World Limited | Hospitality | 2025 |
| Harlib Ltd | Professional & scientific | 2015 |
| Harlow Regeneration Ltd | Real estate | 2004 |
| Harringtons Car Sales Limited | Wholesale & retail | 2003 |
| Harris Homes Rents and Lettings 1 Ltd | Real estate | 2020 |
| Harris Homes Rents and Lettings 2 Ltd | Real estate | 2021 |
| Harris Homes Rents and Lettings Limited | Real estate | 2015 |
| Harrowside Contracts Limited | Professional & scientific | 2017 |
| Hawkesley Court Management Limited | Real estate | 2007 |
| Hearts First AID Training Ltd | Education | 2018 |
| Hearts First Ambulance Company Limited | Health & social care | 2026 |
| Hearts First Ambulance Logistics Ltd | Health & social care | 2020 |
| Hearts First Ambulance Medical Limited | Health & social care | 2023 |
| Hearts First Ambulance Resources Ltd | Administrative & support | 2021 |
| Hearts First Ambulance Service Limited | Health & social care | 2008 |
| Hearts First Ambulance Training Limited | Education | 2024 |
| Heathrow Transfers Ltd | Transport & logistics | 2025 |
| Heisenburg Industries Limited | Arts & recreation | 2013 |
| Helix Business Services Limited | Professional & scientific | 2017 |
| Helix Investments Limited | Information & communication | 2024 |
| Help 4 Addiction Limited | Other services | 2013 |
| HELP4ADDICTION Holdings Limited | Other services | 2023 |
| Helpland Limited | Administrative & support | 2010 |
| Hera Digital Ltd | Professional & scientific | 2024 |
| Heritage Lane Advisory Partners Limited | Professional & scientific | 2026 |
| Heritage Property Improvements Ltd. | Construction | 2026 |
| Hermes City Inventories Limited | Real estate | 2024 |
| Hertfordshire Indoor Cycling Limited | Arts & recreation | 2019 |
| Herts Cars Radlett Limited | Transport & logistics | 2018 |
| Herts Dental Equipment Limited | Extraterritorial | 2014 |
| HGH Properties Limited | Professional & scientific | 1989 |
| High Firs Penthouses Limited | Other services | 2014 |
| High Fliers Holidays Limited | Education | 2013 |
| High Ticket Sales Ltd | Information & communication | 2020 |
| Highfields Management (Radlett) Limited | Professional & scientific | 2000 |
| Highwood (Shenley RD) Limited | Construction | 2018 |
| Highwood Developments (Dragon Inn) Ltd | Real estate | 2012 |
| Highwood Developments (Upminster) Ltd | Real estate | 2003 |
| Highwood Investments Limited | Real estate | 2014 |
| Hillcroft Warren Management Company Limited | Professional & scientific | 2000 |