| Havenridge Services Limited | Hospitality | 2025 |
| Havering Radio Cars UK Limited | Transport & logistics | 2009 |
| Haverstock Hill Londis Limited | Wholesale & retail | 2004 |
| Havlock Developments Ltd | Real estate | 2022 |
| Hawilo Ltd | Manufacturing | 2023 |
| Hawk EYE Protection Ltd | Administrative & support | 2025 |
| Hawk Security & Services Ltd | Extraterritorial | 2008 |
| Hawkesmoor Properties Ltd | Real estate | 2000 |
| Hawkfield Sports Ltd | Wholesale & retail | 2025 |
| Hawks and Eagles Trading Ltd | Wholesale & retail | 2026 |
| Hawkstone Investments Ltd | Financial services | 2025 |
| Hawthorn Property Limited | Real estate | 2013 |
| Haxa Nest Ltd | Wholesale & retail | 2026 |
| Haya Vibe Ltd | Wholesale & retail | 2024 |
| Hayaa Collections Ltd | Wholesale & retail | 2024 |
| Hayah Food Limited | Hospitality | 2025 |
| HAYAN77 Ltd | Wholesale & retail | 2026 |
| Hayat Real Estate Limited | Real estate | 2023 |
| Hayatt International Ltd | Wholesale & retail | 2024 |
| Hayba Diamonds Limited | Wholesale & retail | 2025 |
| Haye Legacy Ltd | Real estate | 2023 |
| Hayer Heating & Plumbing Ltd | Construction | 2023 |
| Hayes Bicycle Ltd | Wholesale & retail | 2025 |
| Hays Real Estate Ltd | Real estate | 2024 |
| Hayward Theydon Bois LLP | | 2020 |
| Haywards Estate Agents Limited | Real estate | 2025 |
| Hayzs Ltd | Information & communication | 2022 |
| HAZ 21 Ltd | Hospitality | 2024 |
| HAZ Parts Ltd | Wholesale & retail | 2019 |
| Hazara Encyclopedia Ltd | Professional & scientific | 2023 |
| Hazawa Ltd | Wholesale & retail | 2017 |
| Hazelbank Properties Limited | Real estate | 2013 |
| Hazeldene Tradings Ltd | Wholesale & retail | 2024 |
| Hazellwood Ltd | Real estate | 2015 |
| Hazelnat Ltd | Wholesale & retail | 2024 |
| Hazera & Zakariya Properties Ltd | Real estate | 2026 |
| Hazizdigital Limited | Information & communication | 2024 |
| HB Builders (London) Ltd | Construction | 2018 |
| HB Fastfood Ltd | Hospitality | 2023 |
| HB Fusion Limited | Construction | 2024 |
| HB Hajee Ltd | Professional & scientific | 2024 |
| HB Realty Limited | Real estate | 2020 |
| HB Realty Management Limited | Financial services | 2022 |
| HBC Estates Limited | Households | 2003 |
| HBG London Limited | Wholesale & retail | 2025 |
| Hbill Technologies Limited | Information & communication | 2025 |
| HBK Services Centre Ltd | Wholesale & retail | 2021 |
| HBN Agency Ltd | Wholesale & retail | 2024 |
| HBN Group Ltd | Wholesale & retail | 2026 |
| HBS Trading Group Ltd | Wholesale & retail | 2026 |
| HCI Food Ltd | Manufacturing | 2024 |
| HCK Consultancy UK Limited | Professional & scientific | 2023 |
| HD Beauty Base Ltd | Other services | 2025 |
| HD Constructions (London) Limited | Construction | 2020 |
| HD First Construction Ltd | Construction | 2021 |
| HD Ilford Lane Ltd | Wholesale & retail | 2026 |
| HDH Builder Ltd | Construction | 2022 |
| HDK Constructions Limited | Construction | 2020 |
| Hdlaptoprepairs Limited | Other services | 2013 |
| HDR383 Ltd | Wholesale & retail | 2025 |
| Hdrl Decorators Ltd | Construction | 2024 |
| HDS Properties Ltd | Real estate | 2020 |
| HE Cares Ltd | Health & social care | 2013 |
| HE8 Ltd | Wholesale & retail | 2025 |
| Heaards Homes Ltd | Real estate | 2024 |
| Head Start Learning Group Ltd | Education | 2022 |
| Headley Finance Consultancy Ltd | Professional & scientific | 2022 |
| Headley TD Ltd | Professional & scientific | 2026 |
| Headlight Sparkle Ltd | Wholesale & retail | 2020 |
| Heads Barbers Ltd | Other services | 2016 |
| Headstart 4 Life Limited | Real estate | 2009 |
| Headwater Ltd | Information & communication | 2026 |
| Heal With Hijama Ltd | Other services | 2025 |
| Healing Justice Ltd | Other services | 2022 |
| Healing Your Inner Goddess Limited | Other services | 2022 |
| Healtex Solutions Ltd | Wholesale & retail | 2023 |
| Health and Wellbeing Ltd | Health & social care | 2025 |
| Health Care Access Solutions Limited | Health & social care | 2024 |
| Health IS Wealth Enterprise Limited | Health & social care | 2024 |
| Health Monitor Ltd | Public administration | 2020 |
| Health View UK Limited | Health & social care | 2022 |
| Healthbridge Direct Limited | Health & social care | 2014 |
| Healthcare Professionals 24/7 Ltd | Education | 2020 |
| Healthconex Limited | Administrative & support | 2018 |
| Healthwatch Redbridge | Health & social care | 2013 |
| Healthy Community Limited | Health & social care | 2025 |
| Healthy Eating Private Limited | Hospitality | 2024 |
| Healthy Foods 4 YOU Ltd | Hospitality | 2021 |
| Healthy Harvest Ltd | Hospitality | 2018 |
| Healthy Living Projects Limited | Health & social care | 2000 |
| Healynx Ltd | Information & communication | 2025 |
| Hearizan Limited | Health & social care | 2025 |
| Heart Developments Ltd | Construction | 2023 |
| Heart Nest Ltd | Education | 2023 |
| Heart of Home Live in Limited | Public administration | 2026 |
| Heart Way Care Ltd | Health & social care | 2025 |
| Heartbeats by Maya CIC | Health & social care | 2025 |
| Heartgiftbox Creations Ltd | Wholesale & retail | 2024 |
| Heartway Horizon Ltd | Hospitality | 2025 |
| Heartwood Care Group Limited | Health & social care | 2010 |