| HBC Trustees Limited | Administrative & support | 2021 |
| HCI (Hampshire) Limited | Real estate | 2017 |
| Headlands Farm Coffee Shop Ltd | Hospitality | 2021 |
| Headlands Farm Lodges Limited | Hospitality | 2020 |
| Headlands Farm Ltd | Agriculture & fishing | 2017 |
| Heal Paint Ltd | Manufacturing | 2026 |
| Health Screening Dorset Limited | Health & social care | 2013 |
| Healthcare Quality Quest Limited | Professional & scientific | 1986 |
| Healthquest Consulting Ltd | Professional & scientific | 2025 |
| Healthtech Strategies Limited | Professional & scientific | 2024 |
| Heartfelt Care Services Limited | Administrative & support | 2020 |
| Heathcote & King ENT Ltd | Health & social care | 2019 |
| Heatwave Solutions Ltd | Construction | 2021 |
| Hedge END Supplies Limited | Wholesale & retail | 2015 |
| Helen Thomas Ltd | Wholesale & retail | 2023 |
| Helios Records Limited | Arts & recreation | 2019 |
| Helix Global Search Limited | Professional & scientific | 2026 |
| Hemalkasa Health Foundation UK | Health & social care | 2014 |
| Henson Wood Ltd | Real estate | 2019 |
| Hentrico Ltd | Information & communication | 2024 |
| HER Medical Care Ltd | Health & social care | 2023 |
| Herbert William Limited | Construction | 2007 |
| Herbertson Anaesthetics Limited | Health & social care | 2002 |
| Heritage Mews (Romsey) Residents Association Limited | Households | 2002 |
| Heritage Will Writing Limited | Professional & scientific | 2012 |
| Heronswood Holdings Limited | Financial services | 2015 |
| Hertford Partners (North) Limited | Administrative & support | 2012 |
| Hertford Partners Limited | Professional & scientific | 2012 |
| Hertfordshire HIP & Knee Care Limited | Health & social care | 2012 |
| Hertfordshire Spine Clinic Limited | Health & social care | 2016 |
| Hexcode Tuning Ltd | Wholesale & retail | 2024 |
| Hfms Fire Engines Limited | Other services | 2020 |
| HFS Gates Limited | Construction | 2014 |
| HI CRT Ltd | Administrative & support | 2026 |
| Hicc Energy Limited | Energy | 2019 |
| Hickman Build & Beyond Ltd | Construction | 2026 |
| Higgins Orthopaedics Ltd | Health & social care | 2023 |
| High Spec Racing Limited | Wholesale & retail | 2021 |
| Highcraft Ltd | Manufacturing | 2026 |
| Highoaks Holdings Ltd | Construction | 2026 |
| Highwood (Botley) Limited | Construction | 2014 |
| Highwood Construction Limited | Construction | 2004 |
| Highwood Group Corporate Trustee Limited | Financial services | 2024 |
| Highwood Group Holdings Limited | Financial services | 2023 |
| Highwood Group Limited | Construction | 2006 |
| Highwood Holdings Limited | Financial services | 2018 |
| Highwood Homes Limited | Construction | 2016 |
| Highwood Land (Horndean) Limited | Real estate | 2013 |
| Highwood Land (South Allington) Limited | Construction | 2015 |
| Highwood Land (Stoke Park) Limited | Construction | 2015 |
| Highwood Land (Winchester Road East) Limited | Construction | 2015 |
| Highwood Projects Limited | Construction | 2006 |
| Highwood Resources Limited | Administrative & support | 2018 |
| Highwood Strategic Land Limited | Construction | 2016 |
| Highwood Ventures 1 Limited | Real estate | 2020 |
| Highwood Ventures 10 Limited | Real estate | 2022 |
| Highwood Ventures 11 Limited | Real estate | 2022 |
| Highwood Ventures 12 Limited | Real estate | 2022 |
| Highwood Ventures 13 Limited | Real estate | 2022 |
| Highwood Ventures 14 Limited | Real estate | 2022 |
| Highwood Ventures 15 Limited | Real estate | 2022 |
| Highwood Ventures 16 Limited | Real estate | 2022 |
| Highwood Ventures 17 Limited | Real estate | 2022 |
| Highwood Ventures 18 Limited | Real estate | 2023 |
| Highwood Ventures 19 Limited | Real estate | 2023 |
| Highwood Ventures 2 Limited | Real estate | 2020 |
| Highwood Ventures 20 Limited | Real estate | 2023 |
| Highwood Ventures 21 Limited | Real estate | 2023 |
| Highwood Ventures 22 Limited | Real estate | 2025 |
| Highwood Ventures 23 Limited | Real estate | 2025 |
| Highwood Ventures 24 Limited | Real estate | 2026 |
| Highwood Ventures 25 Limited | Real estate | 2026 |
| Highwood Ventures 3 Limited | Real estate | 2020 |
| Highwood Ventures 4 Limited | Real estate | 2020 |
| Highwood Ventures 5 Limited | Real estate | 2020 |
| Highwood Ventures 6 Limited | Real estate | 2021 |
| Highwood Ventures 7 Limited | Real estate | 2021 |
| Highwood Ventures 8 Limited | Real estate | 2022 |
| Highwood Ventures 9 Limited | Real estate | 2022 |
| Highwood Ventures Limited | Real estate | 2005 |
| Hill Finance Limited | Financial services | 2020 |
| Hillier Nurseries Limited | Wholesale & retail | 1976 |
| Hillier Sang Management Limited | Administrative & support | 2019 |
| Hillman Risk Management Ltd | Administrative & support | 2015 |
| Hilltop Stables Ltd | Hospitality | 2024 |
| Hithe Limited | Professional & scientific | 2001 |
| Hive Aggregates Limited | Manufacturing | 2021 |
| Hive Cleve Hill LLP | | 2016 |
| Hive Energy Asia Limited | Professional & scientific | 2018 |
| Hive Middle East Limited | Construction | 2017 |
| Hive New Energy Limited | Professional & scientific | 2024 |
| Hive Renewables Limited | Energy | 2023 |
| Hive Solar Limited | Energy | 2022 |
| Hive Spain LLP | | 2017 |
| HJA Solutions Limited | Administrative & support | 2025 |
| HK Property Ventures Ltd | Real estate | 2021 |
| HLQ Events Limited | Professional & scientific | 2014 |
| HNJ Holdings Limited | Financial services | 2025 |
| HOE Lane Investments Limited | Real estate | 2021 |
| HOE Lane Properties Limited | Real estate | 2021 |