| Green Sustainable Materials IP Ltd | Administrative & support | 2026 |
| Green Sustainable Materials Limited | Manufacturing | 2025 |
| Green Sustainable Materials Trading Ltd | Manufacturing | 2026 |
| Green TIX Ltd | Wholesale & retail | 2024 |
| Greenrod Limited | Water & waste | 2011 |
| Greentech FM Ltd | Water & waste | 2023 |
| Greenview Grove Residents Limited | Households | 2023 |
| Gresham Land Co. Ltd | Agriculture & fishing | 1973 |
| Greywood Commercial Limited | Financial services | 2022 |
| Grill HUT Lowestoft Ltd | Hospitality | 2024 |
| Grimsby Shop Ltd | Wholesale & retail | 2024 |
| Grooveworld Limited | Arts & recreation | 2026 |
| Ground UP (Commercial) Ltd | Construction | 2023 |
| Ground UP Property Services Ltd | Construction | 2019 |
| Group Components Limited | Wholesale & retail | 1971 |
| Grow Musical Ltd | Information & communication | 2018 |
| GRPN1 Limited | Real estate | 2023 |
| GSM Ducting Cleaning Limited | Administrative & support | 2025 |
| GSR 1 Ltd | Administrative & support | 2021 |
| GSR 11 Ltd | Administrative & support | 2021 |
| GSR 14 Ltd | Information & communication | 2026 |
| GSR 16 Ltd | Administrative & support | 2022 |
| GSR 17 Ltd | Administrative & support | 2022 |
| GSR 5 Ltd | Administrative & support | 2021 |
| GSR 9 Ltd | Information & communication | 2025 |
| GSR Solutions One Ltd | Information & communication | 2022 |
| GSR Solutions SIX Ltd | Information & communication | 2023 |
| GSR Tech 1 Ltd | Information & communication | 2026 |
| GTM Rural Enterprises Limited | Administrative & support | 2014 |
| Guardian Care Services Ltd | Health & social care | 2015 |
| Guardian Crescent Properties 1 Limited | Real estate | 2023 |
| Guardian Rustem Holding Ltd | Construction | 2020 |
| Guardian Rustem Property Ltd | Real estate | 2020 |
| Guided Loops Ltd | Health & social care | 2020 |
| Gulhat Catering Ltd | Hospitality | 2024 |
| Gullac Ltd | Manufacturing | 2025 |
| Gullet Ltd | Wholesale & retail | 2025 |
| Gulson Cafe Ltd | Hospitality | 2024 |
| Gunes Limited | Real estate | 2025 |
| Gunpowder Mill Developments Limited | Real estate | 2002 |
| Gura Food Ltd | Hospitality | 2026 |
| Gurnos Pizza Grill Ltd | Hospitality | 2024 |
| Gurol Ltd | Education | 2021 |
| GVK Beauty Ltd | Wholesale & retail | 2023 |
| GX7 Limited | Health & social care | 2024 |
| Gypsos Estates Limited | Real estate | 1985 |
| GZK Consultancy Limited | Other services | 2020 |
| H & L Fire Door Solutions Limited | Administrative & support | 2023 |
| H Bridges Limited | Transport & logistics | 2014 |
| H Lari Associates Ltd | Information & communication | 2017 |
| H S Autos & Tyres Limited | Manufacturing | 2024 |
| H.D. Collins Holdings Ltd | Financial services | 2025 |
| Haddington Cafe Ltd | Hospitality | 2024 |
| Hakans Cafe Ltd | Hospitality | 2025 |
| Hale House (Grove Road West) Management Company Limited | Households | 1988 |
| Halid Kebab Ltd | Hospitality | 2025 |
| Hallmanor Limited | Real estate | 2012 |
| Hallmark Adhesives Ltd | Extraterritorial | 2000 |
| Hallmark Global Solutions Ltd | Wholesale & retail | 2019 |
| Halls Close (South) Management Company Limited | Households | 2023 |
| Hamlin Property Investments Limited | Real estate | 2020 |
| Hammer Rigging Limited | Construction | 2025 |
| Hampstead Construction Group Ltd | Construction | 2023 |
| Handdrawn Films Ltd | Information & communication | 2012 |
| Hangar 39 Limited | Transport & logistics | 2003 |
| Hannah Ayala Enterprise Ltd | Wholesale & retail | 2019 |
| Hapi SOL Music & Entertainment Ltd | Arts & recreation | 2026 |
| Happy Days Enterprises Limited | Transport & logistics | 2018 |
| Happy Dragon Arts Limited | Manufacturing | 1999 |
| Harbour Communications Limited | Information & communication | 1995 |
| Hardware Cafe Luton Ltd | Hospitality | 2019 |
| Harlow Regeneration Partnership LLP | | 2023 |
| Harmony Fostering Services Limited | Health & social care | 2013 |
| Haro Constructions Ltd | Administrative & support | 2020 |
| Harrier Office Supplies Limited | Wholesale & retail | 1986 |
| Harringay Meat Wholesale Ltd | Wholesale & retail | 2022 |
| Harris & MO Limited | Real estate | 2024 |
| Hartley Old RD Limited | Real estate | 2024 |
| Hartnett Services Limited | Construction | 2018 |
| Hartsmil Limited | Real estate | 1973 |
| Harvest Coffee Group Ltd | Manufacturing | 2021 |
| Harvest Coffee Limited | Other services | 2018 |
| Hasberk Properties Limited | Real estate | 2008 |
| Hashas Limited | Hospitality | 2023 |
| Hasty Logistics Ltd | Transport & logistics | 2019 |
| Hatin Limited | Transport & logistics | 2026 |
| Hattusha Services Ltd | Water & waste | 2025 |
| Hawkins & Horn Electrical Services Limited | Construction | 2026 |
| Hawkins Landscapes and Building Ltd | Professional & scientific | 2023 |
| Hayes Home Improvements (Brentwood) Limited | Construction | 2018 |
| Haysin UK Limited | Wholesale & retail | 2017 |
| HDC Assembly Ltd | Manufacturing | 2025 |
| Healing Minds Consultants Limited | Health & social care | 2025 |
| Healthcare Consults Ltd | Health & social care | 2024 |
| Healthcare Employment Consortium Limited | Health & social care | 2005 |
| Hedge END Kebab Limited | Hospitality | 2017 |
| Heena Hair Ltd | Other services | 2017 |
| Heidi London Ltd | Wholesale & retail | 2013 |
| Height Sense Ltd | Administrative & support | 2021 |
| Helia Ltd | Transport & logistics | 2025 |