| Grosik Sklep Ltd | Wholesale & retail | 2015 |
| Grosvenor Enterprise Holdings Limited | Financial services | 2016 |
| Ground Data Ltd | Education | 2025 |
| Grounded Luxury Ltd | Construction | 2025 |
| Grove Orthodontics Limited | Health & social care | 2019 |
| Grove Scaffolding Services Limited | Construction | 2022 |
| Grovelane Bathrooms Limited | Construction | 2007 |
| Growth Strategy Consulting Ltd | Professional & scientific | 2025 |
| GRX Gyms Limited | Arts & recreation | 2025 |
| GRX Investments Ltd | Financial services | 2025 |
| GS Plant Training Limited | Education | 2024 |
| GS81 Transport Ltd | Transport & logistics | 2025 |
| GSB Ramsey Ltd | Other services | 2022 |
| GSD Composites Ltd | Professional & scientific | 2025 |
| GT Property Services Limited | Construction | 2021 |
| GTA Holdings EU Limited | Other services | 2007 |
| GTS Collective Limited | Wholesale & retail | 2021 |
| Gulli Barber 3 Ltd | Other services | 2026 |
| Gulli Products Ltd | Other services | 2026 |
| Gumecestre Farm Limited | Agriculture & fishing | 1999 |
| Gutter Centre Limited | Wholesale & retail | 2015 |
| GUY Logan Architects Ltd. | Construction | 2018 |
| Guys Design & Planning Ltd. | Professional & scientific | 2020 |
| Gwcafe Ltd | Hospitality | 2024 |
| Gwilland Sourcing Ltd | Wholesale & retail | 2022 |
| Gym Alpha Limited | Arts & recreation | 2019 |
| H & B Carpentry Services Limited | Construction | 2003 |
| H & D Custance Limited | Agriculture & fishing | 1976 |
| H G Commercial Management Ltd | Professional & scientific | 2026 |
| H S Hurst Limited | Construction | 2004 |
| H.Ease Ltd | Construction | 2018 |
| H3O Business Technologies Limited | Information & communication | 2018 |
| Haayu Limited | Education | 2018 |
| Hackshack Limited | Administrative & support | 2002 |
| Haddenham Steam Rally | Arts & recreation | 2009 |
| Hail Weston PUB Company Ltd | Real estate | 2016 |
| Hair at Studio 36 Limited | Other services | 2022 |
| Hair by Iwona Ltd | Other services | 2016 |
| Hair Salvage Limited | Other services | 2009 |
| Hair Whizz Limited | Other services | 2019 |
| Hairbymilass Limited | Other services | 2025 |
| Hall Agriculture Ltd | Other services | 2016 |
| Hall Green Holdings Limited | Real estate | 2024 |
| Hallam & Jones Homes Limited | Real estate | 2025 |
| Halo Hvac Ltd | Construction | 2023 |
| Haltheon Ltd. | Construction | 2024 |
| Hamerton Conservation and Heritage Centre C.I.C. | Education | 2017 |
| Hamerton Renewables Limited | Energy | 2012 |
| Hamilton Colour Ltd | Other services | 2018 |
| Hamilton Mechanical Services Limited | Construction | 2020 |
| Hamilton-Litos Ltd | Professional & scientific | 2025 |
| Hamptons Ground Care Limited | Administrative & support | 2017 |
| Hamptons Pest Control Ltd | Administrative & support | 2022 |
| HAMZA27 Limited | Hospitality | 2025 |
| Hancox Mechanical Design Ltd | Professional & scientific | 2026 |
| Handlet Limited | Information & communication | 2026 |
| Hanger Inc Ltd | Wholesale & retail | 2021 |
| Hannah and Hayley Ltd | Transport & logistics | 2026 |
| Hans on Wellness Ltd | Other services | 2025 |
| Hansen Strategy Limited | Professional & scientific | 2013 |
| Happy Fins Swim School LLP | | 2023 |
| Happy Homes Property Services Limited | Real estate | 2018 |
| Happy Little Rams Ltd | Health & social care | 2025 |
| Happy Mama Hub Limited | Education | 2022 |
| Happy Positive Limited | Wholesale & retail | 2016 |
| Harcamlow Biomass Limited | Agriculture & fishing | 2025 |
| Harcamlow Farming LLP | | 2019 |
| Hardcore Racing Limited | Administrative & support | 2014 |
| Harding Physiotherapy Limited | Health & social care | 2012 |
| Hare on the Green Ltd | Hospitality | 2018 |
| Hargrave Farming Limited | Agriculture & fishing | 1996 |
| Haris Properties Hunts Limited | Real estate | 2022 |
| Harley Business Park Management Company Limited | Real estate | 1997 |
| Harley Engineering Limited | Manufacturing | 1981 |
| Harmand Property Management Limited | Households | 2002 |
| Harper Mason Ltd | Construction | 2016 |
| Harradine Property Limited | Households | 2024 |
| Harrison Fabrication Lifting Ltd. | Manufacturing | 2009 |
| Harrowden Ltd | Real estate | 2017 |
| Harry Pauley Media Ltd | Information & communication | 2026 |
| Harry Poppins Ltd | Health & social care | 2025 |
| Harry's Wood-Fired Pizzas Ltd | Hospitality | 2019 |
| Hartford Bookkeeping Services Limited | Professional & scientific | 2017 |
| Hartford Property Limited | Real estate | 2022 |
| Hartsmere Logistics Limited | Transport & logistics | 1999 |
| Hartwig Consulting Engineers UK Limited | Professional & scientific | 2025 |
| Harvard Estate Management Limited | Real estate | 1995 |
| Harvey’S of Ramsey Limited | Wholesale & retail | 2018 |
| Harwell Technical Services Limited | Other services | 1995 |
| Hasp Property Limited | Real estate | 2026 |
| Hatched Family Co Ltd | Wholesale & retail | 2024 |
| Haus of Skin & Sculpting Limited | Other services | 2024 |
| Hausmade Ltd | Extraterritorial | 2026 |
| Haves Medicomms Ltd | Administrative & support | 2019 |
| Hawick Development Corporation Limited | Extraterritorial | 1991 |
| Hawk Audio Visual Productions Limited | Information & communication | 2019 |
| Hawkeye Security & Surveillance Systems Ltd. | Administrative & support | 2003 |
| Hawthorn Barns Ltd | Professional & scientific | 2016 |
| Hawthorne Properties Limited | Construction | 2014 |
| Hazlewood Developments Ltd | Construction | 2026 |