| Grayson Pharma Consultants Ltd | Professional & scientific | 2021 |
| GRC Select Limited | Professional & scientific | 2018 |
| Great Lakes Outreach | Other services | 2003 |
| Green Light Park Ltd | Real estate | 2026 |
| Green Pastures Financial Limited | Professional & scientific | 2002 |
| Green Sea Coaching Limited | Professional & scientific | 2005 |
| Greener Goals Limited | Professional & scientific | 2009 |
| Greenheart Property Investment Limited | Real estate | 1994 |
| Greenman Watches Limited | Wholesale & retail | 2023 |
| Greentrade Energy Solutions Limited | Extraterritorial | 2025 |
| Gregory Asquith Limited | Information & communication | 2020 |
| Grey's Residential Homes Ltd | Administrative & support | 2004 |
| GRO Pharmacy Limited | Wholesale & retail | 2000 |
| Group ACTIV-8 Limited | Construction | 2019 |
| Growth Academy Ltd | Health & social care | 2022 |
| Growth Gear Ventures (GGV) Ltd | Professional & scientific | 2025 |
| Growth Partnership International Ltd | Administrative & support | 2009 |
| Growthflow Solutions Ltd | Administrative & support | 2025 |
| GS20PH Service Limited | Households | 2004 |
| GSA Bucks Ltd | Construction | 2025 |
| GT Property Maintenance Ltd | Construction | 2011 |
| Guardslock Ltd | Other services | 2025 |
| Guesthouses for the People Limited | Hospitality | 2017 |
| Gullett & Sons Limited | Construction | 1938 |
| Gurkhatise Limited | Manufacturing | 2014 |
| Gurseerat Variety Store Ltd | Wholesale & retail | 2020 |
| Guruprassad Limited | Hospitality | 2021 |
| GX Executive Ltd | Transport & logistics | 2026 |
| GXR Build Ltd | Construction | 2024 |
| Gynus Consultancy Limited | Professional & scientific | 2017 |
| H & J Trading AS Gentlemen's Lounge Barber Limited | Other services | 2024 |
| H G Matthews Fireplaces Ltd | Wholesale & retail | 2025 |
| H&M Leisure Management Ltd | Arts & recreation | 2021 |
| H&Z Parts Ltd | Wholesale & retail | 2026 |
| H.D. Services Limited | Construction | 1988 |
| H.Knowles-Brown Limited | Agriculture & fishing | 1947 |
| Haaz Enterprises Ltd | Real estate | 2023 |
| Haberdasherylondon Group Limited | Financial services | 2014 |
| Haberdasherylondon Limited | Professional & scientific | 2010 |
| Hadland Estates Limited | Real estate | 2021 |
| Hadlands Property Maintenance Limited | Other services | 2024 |
| Halls Consulting Limited | Professional & scientific | 2012 |
| Halo Project Management Ltd | Professional & scientific | 2017 |
| Hamilton Asset Management Limited | Real estate | 2011 |
| Hamilton Commercial LLP | | 2011 |
| Hamilton Property Consultants Ltd | Construction | 2014 |
| Hamilton Stewardship Projects Limited | Real estate | 2010 |
| Hampton Hall Moorings Limited | Real estate | 2010 |
| Hanchant & Lacey Holdings Ltd | Real estate | 2022 |
| Hanchant Construction Ltd | Construction | 2021 |
| Hands on Treecare and Landscapes Ltd | Professional & scientific | 2023 |
| Handsonelectrics Ltd | Construction | 2026 |
| Handy Resolutions Ltd | Administrative & support | 2007 |
| Handyman Help Limited | Construction | 2015 |
| Handyman Matters Ltd | Other services | 2022 |
| Hanover Woodford Limited | Construction | 2016 |
| Happy Homes (South East) Ltd | Construction | 2024 |
| Harby Interiors Limited | Construction | 2003 |
| Harland & Exton Services Limited | Professional & scientific | 2020 |
| Harrow Dairy Ltd | Wholesale & retail | 2013 |
| Harry Horgan Eventing Ltd | Agriculture & fishing | 2025 |
| Harry Marshall Music Limited | Information & communication | 2021 |
| Harry's Boxing Club Ltd | Arts & recreation | 2019 |
| Hartnall Collins Limited | Construction | 2018 |
| Harvieston Close Management Company Ltd | Real estate | 2025 |
| Hasham & Sons Ltd. | Wholesale & retail | 2016 |
| Hashtag PR Company Limited | Professional & scientific | 2015 |
| Hatstands Broadcast & Media Productions Limited | Information & communication | 2014 |
| Hatton Heinecke Solutions Ltd | Information & communication | 2025 |
| Haven Residency Limited | Real estate | 2021 |
| Hawkes Design & Publishing Limited | Information & communication | 2007 |
| Hawridge Farms Limited | Agriculture & fishing | 2023 |
| Hawridge Investments Limited | Professional & scientific | 1970 |
| Hawridge Management Limited | Households | 2018 |
| Hawridge Strategic Land Limited | Real estate | 2019 |
| Hawridge View Management Company Ltd | Households | 2021 |
| Hawx Design Limited | Professional & scientific | 2018 |
| Hayday Interpreting Ltd | Professional & scientific | 2024 |
| Hazel Morris Interiors Ltd | Professional & scientific | 2023 |
| HC Construction (Services) Ltd | Construction | 2013 |
| HDO Productions Limited | Administrative & support | 2019 |
| Headless Cross Productions Limited | Information & communication | 2016 |
| Headspace Hair Ltd | Extraterritorial | 2021 |
| Headspace Salons Ltd | Other services | 2015 |
| Healing Naturally Limited | Wholesale & retail | 2003 |
| Healing Point Limited | Health & social care | 2004 |
| Hearne Court Freehold Limited | Real estate | 2016 |
| Hearn’S Commercial Services Ltd | Professional & scientific | 2023 |
| Heartland Landscapes Ltd | Administrative & support | 2021 |
| Helios PV Limited | Construction | 2021 |
| Hello Buzz Limited | Professional & scientific | 2024 |
| Hello Communications Group Ltd | Professional & scientific | 2017 |
| Helping Hands Removals & Clearances Limited | Transport & logistics | 2026 |
| Hemel Plumbing and Building Supplies Limited | Real estate | 1978 |
| Henry Mash Court Management Limited | Households | 2013 |
| Heppner Properties Limited | Real estate | 2024 |
| Herbert Moosh Limited | Information & communication | 2024 |
| Heritage Crest Wholesale Ltd | Wholesale & retail | 2026 |
| Heritage Stone Capital Ltd | Real estate | 2025 |
| Heronsgate Management Limited | Real estate | 1967 |