| Hireessex Ltd | Professional & scientific | 2025 |
| HIS Grace Connoisseur Limited | Wholesale & retail | 2009 |
| HIS Mercy Forever Limited | Health & social care | 2023 |
| Hisaab Accounting Services Limited | Professional & scientific | 2024 |
| Hiview Group Ltd | Construction | 2021 |
| Hixondown Limited | Real estate | 1993 |
| Hiya London Ltd | Wholesale & retail | 2024 |
| Hkxldn Nova Ltd | Wholesale & retail | 2026 |
| HM Property Management Services Ltd | Construction | 2025 |
| HMI Tiling Limited | Construction | 2023 |
| HMJ Comms Ltd | Information & communication | 2018 |
| HMJ Investments Ltd | Real estate | 2023 |
| HMY Group Company Ltd | Wholesale & retail | 2024 |
| HNL Security Ltd | Financial services | 2026 |
| Holarbee Properties Limited | Real estate | 2019 |
| Holder Builder Services Ltd Ltd | Construction | 2024 |
| Holford House (Holdings) Limited | Financial services | 2018 |
| Holistic Supported Accommodations | Health & social care | 2020 |
| Hollitravels Ltd | Administrative & support | 2023 |
| Holmes Court(Management Company)Limited | Households | 1977 |
| Holmes Lift Services Ltd | Professional & scientific | 2023 |
| Holmes Property Refurbishments Ltd | Construction | 2021 |
| Holy Ltd | Hospitality | 2026 |
| Home & Business Maintenance Limited | Construction | 2025 |
| Home Heat South East Ltd | Construction | 2022 |
| Home Lovers Furniture Ltd | Wholesale & retail | 2025 |
| Home Maintenance Ltd | Construction | 2007 |
| Home Side Care Ltd | Health & social care | 2019 |
| Homelynx Ltd | Real estate | 2024 |
| Homemade Estates UK Ltd | Real estate | 2023 |
| Homura Ltd | Wholesale & retail | 2025 |
| Honorio Consulting Limited | Professional & scientific | 2022 |
| Hope Coffee Social Ltd | Hospitality | 2024 |
| Hope for 16 Plus Limited | Education | 2016 |
| Hope Psychology Ltd | Education | 2024 |
| Hope Start Staffing Limited | Administrative & support | 2008 |
| Horgan Digital Consultancy Ltd | Information & communication | 2026 |
| Horndon Timber Products Limited | Professional & scientific | 1999 |
| Horndon Windows & Doors Limited | Construction | 2016 |
| House of CRE8TORS Ltd | Information & communication | 2025 |
| House of Drag Bingo Limited | Arts & recreation | 2026 |
| House of Elite Limited | Manufacturing | 2022 |
| House of Flow Limited | Arts & recreation | 2026 |
| House of Imey Ltd | Other services | 2020 |
| House of Zion Properties Ltd | Real estate | 2021 |
| Houses for YOU Ltd | Construction | 2023 |
| Housespa Properties Limited | Real estate | 2025 |
| Houze of Bliss Ltd | Health & social care | 2025 |
| Howat Construction Ltd | Construction | 2025 |
| HP Solid Properties Ltd | Construction | 2025 |
| HQ Rugs and Carpets Limited | Construction | 2022 |
| HQ Security Systems Ltd | Administrative & support | 2021 |
| HR & Properties Ltd | Real estate | 2025 |
| HR Barbers Limited | Other services | 2023 |
| HS Lift Services Ltd | Construction | 2023 |
| Hsmd Accessories Ltd | Wholesale & retail | 2025 |
| HUI Dong UK Limited | Hospitality | 2017 |
| HUM Service Limited | Administrative & support | 2025 |
| Humiko Ltd | Transport & logistics | 2021 |
| Hunters Chase Garden Centre Limited | Administrative & support | 1998 |
| Huntersson Ltd | Professional & scientific | 2012 |
| Hushbaby Ltd | Health & social care | 2014 |
| Hutton Pre-School Limited | Education | 1999 |
| Huxley Inc Ltd | Wholesale & retail | 2019 |
| HVG Lakeside Ltd | Wholesale & retail | 2025 |
| Hybrid and Electric Vehicle Services Ltd | Wholesale & retail | 2023 |
| Hydro 37 Ltd | Wholesale & retail | 2017 |
| Hylands Properties Ltd | Real estate | 2024 |
| HZS Engine Limited | Wholesale & retail | 2025 |
| I F Abdul Consulting Ltd | Health & social care | 2026 |
| I Tippers Ltd | Water & waste | 2025 |
| I&C Solution Ltd | Wholesale & retail | 2025 |
| I&M Motors Ltd | Wholesale & retail | 2017 |
| I&N Mechanical Ltd | Construction | 2023 |
| I-Rise Services Ltd | Administrative & support | 2022 |
| I-Scan Healthcare Ltd | Health & social care | 2022 |
| I.A.N. Roofing Ltd | Construction | 2021 |
| I.C Ugwu Global Export Ltd | Wholesale & retail | 2026 |
| I.M. Personnel Ltd | Administrative & support | 2018 |
| I2I Care Limited | Wholesale & retail | 2007 |
| IACOB2022 Ltd | Construction | 2024 |
| Iain's IT Solutions Ltd. | Information & communication | 2013 |
| IAN Solutions Ltd | Transport & logistics | 2016 |
| IB Home Services Limited | Construction | 2023 |
| IB Investment Management Ltd | Real estate | 2023 |
| IB Krystals Limited | Wholesale & retail | 2017 |
| IB Pro Plastering Limited | Construction | 2023 |
| Ibab Ltd | Administrative & support | 2015 |
| Ibdare Limited | Construction | 2017 |
| Ibk’S Kitchen Limited | Hospitality | 2019 |
| Ibotea DRV. Limited | Transport & logistics | 2018 |
| Ibraheem Ltd | Administrative & support | 2022 |
| Ibrahimbayramconstruction Ltd | Construction | 2019 |
| Icar World Ltd | Wholesale & retail | 2016 |
| Icarbon Ltd | Professional & scientific | 2018 |
| Ice White Toothfairy Limited | Health & social care | 2024 |
| ICL Electrical Limited | Construction | 2014 |
| Iconic Bayowa International Ltd | Wholesale & retail | 2023 |
| Iconic Customisations Ltd | Professional & scientific | 2021 |
| Iconic Impact Ltd | Professional & scientific | 2024 |