| Homefiltertap Ltd | Construction | 2024 |
| Homefront Lounge Ltd | Hospitality | 2025 |
| Homegrown Learning Hub Ltd | Education | 2024 |
| Homeland Synergy Limited | Other services | 2018 |
| Homes and Residential Ltd | Households | 2026 |
| Homes Heatings and Plumbing Ltd | Construction | 2025 |
| Homesdale Road Allotments Ltd | Arts & recreation | 2019 |
| Homeswithme Ltd | Extraterritorial | 2024 |
| Homeworks (Danloe) Limited | Construction | 2014 |
| Honeycomb International Ltd | Wholesale & retail | 2019 |
| Hongs Cotmandene Limited | Hospitality | 2026 |
| Hooked 4 Cafe Ltd | Hospitality | 2026 |
| Hooked Cafè & Grill Limited | Hospitality | 2024 |
| Hooper Consulting Ltd | Professional & scientific | 2016 |
| Hope Church Orpington | Other services | 2008 |
| Hope Thom Ltd | Professional & scientific | 2024 |
| Hops Investments Ltd | Real estate | 2023 |
| Horizen View Limited | Financial services | 2025 |
| Horizon Artists Limited | Professional & scientific | 2020 |
| Horizon AV Group Limited | Wholesale & retail | 2025 |
| Horizon Electrical & Renewable Ltd | Construction | 2026 |
| Horizon Waste Limited | Water & waste | 2025 |
| Horton Builder (Petts Wood) Limited | Construction | 2021 |
| Horton Energy Limited | Construction | 2023 |
| Horton Holidays Ltd | Administrative & support | 2018 |
| Horton Rendering Limited | Extraterritorial | 2025 |
| Hosking Property Partnership Limited | Real estate | 2017 |
| Hospitality in Golf UK Ltd | Professional & scientific | 2026 |
| Host HR Limited | Administrative & support | 2025 |
| Host Your Space Ltd | Information & communication | 2022 |
| Hot Mess Trading Ltd | Hospitality | 2023 |
| Hoti Constraction Ltd | Construction | 2025 |
| House 24 Limited | Real estate | 2025 |
| House Building Services Limited | Construction | 2025 |
| House Cube Services Limited | Real estate | 2017 |
| House of Drogo Ltd | Wholesale & retail | 2026 |
| House of Eight Ltd | Professional & scientific | 2025 |
| House of Hounds BR5 Ltd | Other services | 2023 |
| House of MT Holdings Limited | Wholesale & retail | 2023 |
| House of Nails 624 Ltd | Other services | 2026 |
| House of Pouch UK Ltd | Manufacturing | 2025 |
| House of Woolf Ltd | Professional & scientific | 2025 |
| Houseofyooni Limited | Professional & scientific | 2025 |
| Houses of RA Limited | Real estate | 2022 |
| Housetagz Ltd | Information & communication | 2019 |
| How+Wil Construction Ltd | Construction | 2020 |
| Howard & Charlotte Co. Ltd | Real estate | 2023 |
| HP & KK Ltd | Hospitality | 2023 |
| HQ Bridge Ltd | Information & communication | 2022 |
| HR Outsourcing Consultant's Limited | Administrative & support | 2017 |
| Hub Property Maintenance Limited | Real estate | 2017 |
| Hudson Carpentry, Joinery and General Building Limited | Construction | 2017 |
| Hudsons Accountancy Limited | Professional & scientific | 2012 |
| HUE House Ltd | Manufacturing | 1999 |
| Huer Ltd | Health & social care | 2016 |
| Hugh Anthony Interiors Limited | Construction | 2000 |
| Hulbury Ltd | Real estate | 2025 |
| Humanity Freed Limited | Information & communication | 2025 |
| Humanix Consulting Ltd | Professional & scientific | 2025 |
| Hummingbird Services Ltd | Wholesale & retail | 2022 |
| Hunter & Daughters Limited | Real estate | 2014 |
| Hunter House Properties Limited | Real estate | 2022 |
| Hunts Property Management Ltd | Real estate | 2024 |
| Hurstlands Drive Estate Management Company Limited | Real estate | 2010 |
| HUS Catering Limited | Hospitality | 2026 |
| Huscle Ltd. | Extraterritorial | 2023 |
| Hussfx Ltd | Information & communication | 2014 |
| HVL Properties Limited | Real estate | 2003 |
| Hyat Investment Limited | Real estate | 2020 |
| Hyat Pharma Ltd | Wholesale & retail | 2019 |
| Hybrid Plumbing and Heating (London) Ltd | Construction | 2020 |
| Hydrasat UK Limited | Information & communication | 2014 |
| Hydrogen Training Limited | Education | 2025 |
| Hydrometric Limited | Manufacturing | 2024 |
| HYH Technology Group Limited | Wholesale & retail | 2024 |
| Hypertech Partnership Ltd | Other services | 2021 |
| I MEC Engineering (UK) Limited | Manufacturing | 2026 |
| I Trade Partner Group Limited | Professional & scientific | 2024 |
| I&Khughes Ltd | Construction | 2024 |
| I&T Holdings Limited | Financial services | 2024 |
| I-Bit Holdings Limited | Financial services | 2020 |
| I-Growhydro Ltd | Extraterritorial | 2017 |
| I-One Limited | Administrative & support | 1998 |
| I-Pallet Group Ltd | Transport & logistics | 2022 |
| I.R.Doctor Ltd | Health & social care | 2022 |
| I2E Consultancy Ltd | Information & communication | 2024 |
| Ia.Ra.Properties Ltd | Real estate | 2024 |
| Iacs Holdings Limited | Financial services | 2017 |
| Iacs Training and Education Limited | Education | 2024 |
| IAN Denney Windows & Doors Ltd | Administrative & support | 2011 |
| IAN Johnson Publicity Limited | Information & communication | 2006 |
| IAN Wood Commercial Ltd | Real estate | 2022 |
| Iannic Limited | Wholesale & retail | 2026 |
| Iberi Consulting Ltd | Information & communication | 2019 |
| IBN Construction Ltd | Construction | 2014 |
| IBP London Limited | Administrative & support | 2012 |
| Ibusiness IT Limited | Information & communication | 2007 |
| Ic-Y Services LLP | | 2025 |
| Ic-Y Solutions Limited | Construction | 2013 |
| ICA Classics Limited | Information & communication | 2010 |