| Gwillim Ltd | Hospitality | 2011 |
| GWL Consultancy Limited | Information & communication | 2008 |
| GX FA CAI Limited | Hospitality | 2017 |
| GX Modular Limited | Manufacturing | 2019 |
| GXO Ltd | Extraterritorial | 2022 |
| GXS Management Limited | Real estate | 2012 |
| GYK Enterprises Ltd | Education | 2019 |
| Gym and Juice Club Ltd | Arts & recreation | 2024 |
| Gym and Juice Recovery Ltd | Health & social care | 2025 |
| Gymbile Limited | Information & communication | 2023 |
| H & H Minibus Hire Ltd | Transport & logistics | 2017 |
| H & K Global Ltd | Professional & scientific | 2017 |
| H & M Property Ltd | Real estate | 2015 |
| H & N Services Ltd | Health & social care | 2020 |
| H Alissa Ltd | Professional & scientific | 2022 |
| H and M Medico Ltd | Health & social care | 2026 |
| H J Macdonald Ltd | Information & communication | 2014 |
| H M Computer Services LLP | | 2007 |
| H S Autos Ltd | Wholesale & retail | 2024 |
| H Sangha Ltd | Health & social care | 2020 |
| H Star London Limited | Wholesale & retail | 2025 |
| H&M Electrical Contractors Ltd | Construction | 2017 |
| H&S Health Ltd | Health & social care | 2024 |
| H. Baumbach and Company Limited | Manufacturing | 1977 |
| H.G. Frost Building Contractors Limited | Construction | 2002 |
| H.G. Moore & SON Limited | Transport & logistics | 1962 |
| H.J.S.H Limited | Administrative & support | 2018 |
| H1 Heating Ltd | Construction | 2022 |
| H20 MB Limited | Administrative & support | 2012 |
| H20 TW Ltd | Administrative & support | 2013 |
| H20 Westfield Ltd | Administrative & support | 2013 |
| H2LOWE Consulting Limited | Professional & scientific | 2021 |
| H2O Heating and Plumbing Limited | Construction | 2022 |
| H2OPE Engineering Services Ltd | Manufacturing | 2022 |
| H4 Lettings Ltd | Real estate | 2023 |
| H4 Property Management Ltd | Hospitality | 2023 |
| H7 Media Systems Ltd. | Wholesale & retail | 2004 |
| Haakku Properties Ltd | Real estate | 2026 |
| Haan Management Ltd | Real estate | 2025 |
| Habiba Mohammed Trading EST Ltd | Wholesale & retail | 2025 |
| Habit-Training Limited | Arts & recreation | 2023 |
| Habour Ventures Ltd | Real estate | 2020 |
| Hacienda Motors Ltd | Wholesale & retail | 2022 |
| Hackney 4 Limited | Real estate | 2014 |
| Hadleigh Pest Control Ltd | Other services | 2026 |
| Haelan Pharmaceuticals Limited | Professional & scientific | 2020 |
| Haelo Health Ltd | Manufacturing | 2025 |
| Hafren Systems Limited | Information & communication | 2026 |
| Hagglebaggle Limited | Wholesale & retail | 2023 |
| Haider Kazi Jute Mills Ltd | Manufacturing | 2025 |
| Haifatelaviv Limited | Wholesale & retail | 2025 |
| Haines Management Solutions Ltd | Professional & scientific | 2014 |
| Hair HIS & HER Ltd | Other services | 2015 |
| Haiyangtrade Ltd | Wholesale & retail | 2026 |
| Haki Trading Ltd | Wholesale & retail | 2023 |
| Hakimian Limited | Education | 2026 |
| Haks Consult Limited | Information & communication | 2016 |
| Halcyon Gaia Ltd | Construction | 2025 |
| Halcyon International (UK) Ltd | Wholesale & retail | 2011 |
| Half Empty Ltd | Wholesale & retail | 2024 |
| Halfway Studios Ltd | Professional & scientific | 2025 |
| Haliden Ltd | Real estate | 2021 |
| Hall Farm Barns (Drinkstone) Management Company Limited | Water & waste | 2009 |
| Hallico Ltd | Professional & scientific | 2024 |
| Halo Hr-Consulting Ltd | Professional & scientific | 2018 |
| HALO11 Ltd | Administrative & support | 2024 |
| Hamadri Ltd | Professional & scientific | 2026 |
| Hamilton Brown Limited | Manufacturing | 2023 |
| Hamilton Rathbone Ltd | Administrative & support | 2013 |
| Hamlet Stays Ltd | Hospitality | 2024 |
| Hammo S&T Ltd | Manufacturing | 2016 |
| Hampers Sandwich Bar Ltd | Hospitality | 2021 |
| Hamprises Limited | Information & communication | 2020 |
| Hampshire Advisory Ltd | Professional & scientific | 2024 |
| Hampshire CAD Services Ltd | Professional & scientific | 2025 |
| Hampson Miller Ltd | Information & communication | 2021 |
| Hampson Williams and Kimble Architects Limited | Professional & scientific | 2010 |
| Hamtee Limited | Manufacturing | 2025 |
| Hamza Khan Holdings Ltd | Real estate | 2023 |
| Hana Moazzeni Limited | Wholesale & retail | 2023 |
| Hancore Ltd | Real estate | 2022 |
| Handsome Trader Ltd | Wholesale & retail | 2016 |
| Handyapp Ltd | Information & communication | 2026 |
| Handyrat - Property Maintenance and Renovations Ltd | Construction | 2024 |
| Handyrat - Property Services Ltd | Construction | 2025 |
| Hani Leathers Ltd | Wholesale & retail | 2024 |
| Hannah and Joshua Properties Limited | Real estate | 2024 |
| Hannan Health Ltd | Health & social care | 2026 |
| Hanoi Cafe Ltd | Hospitality | 2000 |
| Happ Health Ltd | Wholesale & retail | 2024 |
| Happarel Ltd | Wholesale & retail | 2025 |
| Happiness Healthcare Ltd | Health & social care | 2026 |
| Happy Hair Limited | Wholesale & retail | 2018 |
| Happy Healthy Life Limited | Hospitality | 2019 |
| Happy Holmes Limited | Real estate | 2018 |
| Happy Humble Hearts CIC | Professional & scientific | 2023 |
| Happy Sisyphus Productions Ltd | Information & communication | 2023 |
| Happy Snackers Vending Ltd | Hospitality | 2025 |
| Happy Tails Home Stay Ltd | Agriculture & fishing | 2024 |
| Happyplan Ltd | Information & communication | 2025 |