| Helmington Project Services Limited | Construction | 2023 |
| Help at Home by JEN and Co Ltd | Administrative & support | 2020 |
| Help Build Ltd | Construction | 2023 |
| Hemel Optical Limited | Wholesale & retail | 2026 |
| Hemming Couriers Ltd | Transport & logistics | 2024 |
| Hendre Vehicles Limited | Wholesale & retail | 2016 |
| Hendrikx Hockey Limited | Education | 2022 |
| Hengar Associates Limited | Real estate | 2006 |
| Henleaze Building Company Ltd | Construction | 2006 |
| Hennah Haywood Law Ltd | Professional & scientific | 2017 |
| Henry James Consultancy Services Limited | Professional & scientific | 2013 |
| Henry James Saddles Limited | Manufacturing | 2015 |
| Henry Morris (1958) Limited | Wholesale & retail | 1958 |
| Henstaff Construction Limited | Construction | 1997 |
| Hepburns Planning Consultancy Limited | Professional & scientific | 2006 |
| Hepcom Property Ltd | Real estate | 2023 |
| Hephdan Services Limited | Hospitality | 2026 |
| HER New Chapter Skincare Ltd | Wholesale & retail | 2026 |
| HER Place Ltd | Administrative & support | 2024 |
| HER Story Theatre Company Ltd | Arts & recreation | 2024 |
| Hera Creative Design Limited | Professional & scientific | 2021 |
| Herbaverse Ltd | Wholesale & retail | 2024 |
| Herbert Mitchell Limited | Mining & quarrying | 2012 |
| Hergan Construction Limited | Construction | 2010 |
| Heristore Ltd | Wholesale & retail | 2025 |
| Heritage Family Construction Enterprise Ltd | Construction | 2026 |
| Heritage Financial Services (IW) Limited | Financial services | 2014 |
| Heritage Global Services Limited | Health & social care | 2018 |
| Heritage Hiker Limited | Extraterritorial | 2022 |
| Heritage Windscreens Ltd | Wholesale & retail | 2019 |
| Heritage Zone Limited | Education | 2015 |
| Herluster Ltd | Wholesale & retail | 2025 |
| Heron Food IW Ltd | Hospitality | 2023 |
| Heron House Employee Ownership Trustee Limited | Professional & scientific | 2020 |
| Heron Lounge IW Ltd | Hospitality | 2022 |
| Heronridge Limited | Professional & scientific | 2008 |
| Hetty's Baby Boutique Limited | Wholesale & retail | 2021 |
| Hewelsfield Cottages Limited | Hospitality | 2020 |
| Hewelsfield Farms Limited | Financial services | 2020 |
| Hexa Capital Solutions Ltd | Administrative & support | 2025 |
| Hexa Finance Limited | Professional & scientific | 2020 |
| Hexa Group Limited | Professional & scientific | 2023 |
| Hexsol Limited | Information & communication | 2005 |
| HEY Good Dog Ltd | Other services | 2023 |
| HEY K-Chi Ltd | Wholesale & retail | 2025 |
| Heyoka Limited | Professional & scientific | 2013 |
| HF Trade Ltd | Wholesale & retail | 2019 |
| HFW Properties Ltd | Real estate | 2024 |
| HFZ Enterprises Ltd | Wholesale & retail | 2022 |
| HFZ Travel Limited | Transport & logistics | 2022 |
| HI Furniture Limited | Wholesale & retail | 2008 |
| Higginson House (Cowes) Limited | Real estate | 2015 |
| High Cross Upvc & Developments Limited | Construction | 2012 |
| High Cross Wealth Management Ltd | Financial services | 2022 |
| High Definition Beauty(Newport) Limited | Other services | 2014 |
| High Park Developments LLP | | 2022 |
| High Salterns (Seaview) Management Company Limited | Households | 1976 |
| High Standard Trading Ltd | Wholesale & retail | 2025 |
| High Steeze Ltd | Wholesale & retail | 2025 |
| High Torque Rope Access Solutions Ltd. | Construction | 2014 |
| High Trees Green Management Limited | Households | 2006 |
| High Voltage Harv Ltd | Information & communication | 2025 |
| Highbridge Property Solutions Ltd | Real estate | 2026 |
| Highcross Stores Limited | Wholesale & retail | 2025 |
| Highfield Court Management Company Limited | Real estate | 1985 |
| Highgrove Gardens (Romsey) Management Company Limited | Households | 2018 |
| Highlife Ventures Limited | Real estate | 2020 |
| Highlight Painters Ltd. | Construction | 2017 |
| Highline Building Services Limited | Construction | 2014 |
| Highmore Facilities Ltd | Other services | 2018 |
| Highmore Investments Ltd | Hospitality | 2019 |
| Highway Car Sales Ltd | Wholesale & retail | 2020 |
| Hijet Cymru Limited | Transport & logistics | 2015 |
| Hiley Trading Company Ltd | Construction | 2024 |
| Hilfrey Limited | Health & social care | 2017 |
| Hill & Co Financial Advisers Ltd | Financial services | 2016 |
| Hill Grove Associates Limited | Professional & scientific | 2016 |
| Hill Grove Consultancy Limited | Professional & scientific | 2019 |
| Hill ST. Chocolates Ltd | Manufacturing | 2015 |
| Hill Vehicle Services Ltd | Wholesale & retail | 2018 |
| Hillbower Management Limited | Real estate | 2025 |
| Hillcroft Garage Limited | Wholesale & retail | 2014 |
| Hillcroft Langstone Limited | Real estate | 2005 |
| Hillcroft Stores 2026 Limited | Wholesale & retail | 2026 |
| Hillcroft Stores Limited | Wholesale & retail | 2016 |
| Hillcroft Turf Supplies Limited | Administrative & support | 2025 |
| Hillfix Property Management Limited | Real estate | 2024 |
| Hillman James Limited | Construction | 2018 |
| Hillside Escapes Ltd | Hospitality | 2023 |
| Himalayas Music Limited | Wholesale & retail | 2018 |
| Hiom Advisory Limited | Professional & scientific | 2017 |
| Hippo Developments Ltd | Real estate | 2022 |
| Hiredesire Limited | Administrative & support | 2025 |
| Hirenet Ltd | Administrative & support | 2014 |
| HIS Pleasure Services Ltd | Wholesale & retail | 2025 |
| Hisas (K.H) Limited | Professional & scientific | 2017 |
| Hisas Properties Ltd | Real estate | 2025 |
| HIT Education Limited | Education | 2017 |
| HIT Nowak Ltd | Construction | 2022 |
| Hiya Hinny Ltd | Professional & scientific | 2024 |