| Guarding Professionals Ltd | Administrative & support | 2010 |
| Guddamark Solutions Limited | Administrative & support | 2026 |
| Gudgeon Court (Management) Limited | Households | 1977 |
| Gulerz Properties Limited | Real estate | 2026 |
| Gulos Properties Limited | Real estate | 2024 |
| Gulsen Property's Ltd | Real estate | 2024 |
| Gulum Ltd | Hospitality | 2026 |
| Gulus Music Centre Limited | Arts & recreation | 2017 |
| Gundem Ltd | Professional & scientific | 2021 |
| Gunes Building Ltd | Construction | 2026 |
| Gunes Meat Limited | Wholesale & retail | 2026 |
| Gunes Real Estate Ltd | Real estate | 2025 |
| Gunesler Limited | Construction | 2026 |
| Guneykisla Ltd | Administrative & support | 2022 |
| Gungor Property Ltd | Real estate | 2022 |
| Gunner Brown Ltd | Construction | 2015 |
| Gunner Enterprises Ltd | Real estate | 2026 |
| Gura Property Management LLP | | 2024 |
| Gurgur Limited | Real estate | 2020 |
| Gursoy Properties Limited | Real estate | 2025 |
| GUY Lodge Estates Limited | Real estate | 2017 |
| Guzel Holdings Ltd | Real estate | 2022 |
| Gvablt Ltd | Construction | 2025 |
| Gvany Ltd | Construction | 2021 |
| GVM Building Restoration Ltd | Construction | 2018 |
| GVN Family Ltd. | Construction | 2022 |
| GW Bodyshop (UK) Limited | Administrative & support | 2010 |
| GW Construction Group Ltd | Construction | 2021 |
| GW Glass Ltd | Construction | 2025 |
| GWE Associates Ltd | Professional & scientific | 2008 |
| GWP Bookkeeping Limited | Professional & scientific | 2022 |
| Gym Ghost Ltd | Wholesale & retail | 2022 |
| Gymplicity Ltd | Arts & recreation | 2026 |
| Gymtym Ltd | Arts & recreation | 2023 |
| Gymvault Shop Ltd | Wholesale & retail | 2025 |
| H & a Meat Ltd | Wholesale & retail | 2025 |
| H & E Dinh Pham Pro Limited | Real estate | 2025 |
| H & K Roofing Ltd | Construction | 2022 |
| H Brown Investments Ltd | Construction | 2025 |
| H D Roofing & Building Solutions Ltd | Construction | 2021 |
| H K Portfolio Ltd | Financial services | 2017 |
| H M London Electrical Ltd | Construction | 2026 |
| H M Tyres Ltd | Wholesale & retail | 2023 |
| H Naik Limited | Professional & scientific | 2019 |
| H&C IT Management Ltd | Information & communication | 2015 |
| H&S Management Limited | Administrative & support | 2019 |
| H&T Group London Limited | Wholesale & retail | 2025 |
| H&T VEG and Fruitland Ltd | Wholesale & retail | 2022 |
| H.A. Law Investments Ltd | Real estate | 2024 |
| H.T.M. Tradeco Limited | Administrative & support | 1988 |
| H20 DJY Ltd | Wholesale & retail | 2018 |
| H2H Property Services Ltd | Construction | 2025 |
| H2O Solutions Tech Ltd | Water & waste | 2025 |
| HA ANH Limited | Other services | 2018 |
| HA Education Ltd | Education | 2026 |
| HAB Logistics Ltd | Transport & logistics | 2026 |
| Habitat Group Ltd | Construction | 2019 |
| Hackberry Foods Ltd | Hospitality | 2026 |
| Hacoli Taxi Limited | Transport & logistics | 2026 |
| Hadfield Close Management Limited | Real estate | 1999 |
| Hadnick Ltd | Financial services | 2025 |
| Haha Graphic Limited | Professional & scientific | 2009 |
| Haiduong Limited | Other services | 2021 |
| Hair Artistry Limited | Other services | 2021 |
| Hair by BOO Ltd | Other services | 2025 |
| Hair LUX Ltd | Other services | 2013 |
| Hair Palace Limited | Other services | 2010 |
| Hair Specialist UK Ltd | Health & social care | 2020 |
| Hairsol Limited | Information & communication | 2023 |
| Hairwaves Limited | Wholesale & retail | 1998 |
| HAK London Ltd | Hospitality | 2021 |
| Hakeem's Haven Limited | Real estate | 2025 |
| Haku Consultancy Co Ltd | Wholesale & retail | 2021 |
| Haku Technology Limited | Administrative & support | 2015 |
| Hakz Catering Ltd | Hospitality | 2026 |
| Halcyon Lettings Limited | Real estate | 2003 |
| Hallie’S Hair Ltd | Other services | 2025 |
| Halmusaj Construction Ltd | Construction | 2025 |
| Halmusaj Steel Fixers Ltd | Construction | 2022 |
| Halo Dogs Ltd | Other services | 2010 |
| Halo Dogs Rescue & Rehabilitation | Other services | 2015 |
| Halo Dogs Training Ltd | Other services | 2019 |
| Halperin Investments Ltd | Financial services | 2021 |
| Halstons Homes Ltd | Real estate | 2024 |
| Hamdan Ventures Limited | Information & communication | 2022 |
| Hamilton & Co. Property Limited | Real estate | 2025 |
| Hamilton Contracts Limited | Wholesale & retail | 1998 |
| Hampsmith Limited | Extraterritorial | 2018 |
| Hampstead Psychology Ltd | Health & social care | 2025 |
| Hampton Clinical Insourcing Limited | Administrative & support | 2021 |
| Hampton Wick Investments Limited | Real estate | 2017 |
| Hamshahri Construction Ltd | Construction | 2025 |
| Hamshahri Ltd | Households | 2025 |
| HAN Nails&Beauty Limited | Other services | 2024 |
| Hanci Cafe Ltd | Hospitality | 2026 |
| Hanco Limited | Wholesale & retail | 2012 |
| Handy Limited | Wholesale & retail | 1991 |
| Handy Maintain Ltd | Construction | 2025 |
| Handy Trades Professional Limited | Administrative & support | 2018 |
| HANDYMAN4U Limited | Construction | 2024 |