| Hero Property Group Ltd | Extraterritorial | 2023 |
| Hero Property Services Ltd | Real estate | 2024 |
| Hero Sleeves Tactical Ltd | Manufacturing | 2020 |
| Heromedia Productions Limited | Administrative & support | 2010 |
| Herozan Limited | Hospitality | 2021 |
| Herron Vehicle Design Limited | Professional & scientific | 2016 |
| Hertford Mews RTM Company Limited | Households | 2022 |
| Hertfordshire and Bedfordshire Gastroenterology (HBG) Limited | Health & social care | 2018 |
| Hertfordshire Film & TV Studios Limited | Information & communication | 2024 |
| Hertfordshire Grazing Company Ltd | Hospitality | 2018 |
| Hesc Ltd | Construction | 2012 |
| Hestia Renovations Limited | Construction | 2015 |
| Hesy Solutions Limited | Health & social care | 2019 |
| Hewes Consulting Limited | Information & communication | 2015 |
| Heybridge Contracts Limited | Administrative & support | 2018 |
| Heybridge Management Limited | Households | 2004 |
| Heycroft Staffing Solutions Ltd | Administrative & support | 2022 |
| Heyjq Limited | Arts & recreation | 2012 |
| Heyking Design Limited | Other services | 2014 |
| HF Health Limited | Health & social care | 2014 |
| HFS Sutton Property Ltd | Real estate | 2019 |
| HG Companies Ltd | Real estate | 2025 |
| HGN Design Ltd | Administrative & support | 2012 |
| HGV Quick Transport Ltd | Transport & logistics | 2020 |
| Hgv-Uk Ltd | Transport & logistics | 2022 |
| Hhack Ltd | Professional & scientific | 2014 |
| HHF Farms Ltd | Agriculture & fishing | 2020 |
| HHK Group Ltd | Financial services | 2020 |
| Hi-Def Solutions Limited | Information & communication | 2009 |
| Hickman Cars Ltd | Wholesale & retail | 2024 |
| Hicks Building Services Limited | Construction | 2003 |
| Hidden Beauty - Aesthetics,Tanning & Training Ltd | Other services | 2022 |
| Higgins Cladding Limited | Wholesale & retail | 2015 |
| Higgins Removals & Storage Limited | Transport & logistics | 2023 |
| Higgins Residential Ltd | Real estate | 2025 |
| High Barn Heritage Ltd | Hospitality | 2020 |
| High Class Carpentry & Joinery Limited | Construction | 2013 |
| High Contract Interiors Limited | Manufacturing | 2026 |
| High Definition AV Ltd | Information & communication | 2024 |
| High Elms Management Limited | Households | 2022 |
| High Expectations Tutoring Ltd | Education | 2023 |
| High Oaks Ltd | Administrative & support | 2017 |
| High Performance Aviation Ltd | Professional & scientific | 2026 |
| High Performance Drylining Ltd | Construction | 2019 |
| High Point Technologies UK Ltd | Extraterritorial | 2011 |
| High Road Layer De-La Haye Management Company Limited | Households | 1989 |
| High Sight South East Ltd | Construction | 2020 |
| Highams Station Avenue Management Limited | Households | 1988 |
| Highbridge Rail Services Limited | Administrative & support | 2023 |
| Highbush Properties Limited | Real estate | 2020 |
| Higher Air Ltd | Professional & scientific | 2018 |
| Higher Calling CIC | Education | 2026 |
| Highfields Nursery Ltd | Wholesale & retail | 2019 |
| Highgrove Close Loughton Management Company Limited | Professional & scientific | 2020 |
| Highly Relational Limited | Administrative & support | 2023 |
| Hightrees Properties Holdings Limited | Financial services | 2006 |
| Hightrees Properties Limited | Real estate | 1981 |
| Highway Services Limited | Extraterritorial | 2008 |
| Highwood BG Ltd | Professional & scientific | 2024 |
| Highwood Solicitors Limited | Professional & scientific | 2023 |
| Highwoods (Colchester) Management Company Limited | Households | 1985 |
| Highwoods Chiropractic Limited | Health & social care | 2021 |
| Highwoods Community Interest Company | Hospitality | 2009 |
| Highwoods Community Primary School | Education | 2013 |
| Highwoods Heating Ltd | Construction | 2024 |
| Highwoods Services Limited | Information & communication | 2024 |
| Hijazi Company Ltd | Health & social care | 2020 |
| Hijk Medical Services Limited | Health & social care | 2023 |
| Hilite Agency Ltd | Professional & scientific | 2018 |
| Hill Farm Flooring Ltd | Construction | 2025 |
| Hill Piling Limited | Construction | 1996 |
| Hill Properties (Essex) Limited | Real estate | 2008 |
| Hill-Brooker Solutions Limited | Information & communication | 2019 |
| Hillcastle Properties Ltd | Real estate | 2015 |
| Hillcrest Luxury Homes Limited | Transport & logistics | 2015 |
| Hillcrest Properties Colchester Ltd | Households | 2022 |
| Hillcrest Property Solutions Investment Ltd | Real estate | 2021 |
| Hilleary Ltd | Real estate | 2017 |
| Hilliams Property Limited | Construction | 1998 |
| Hillrise Homes Limited | Construction | 2013 |
| Hillrise Investments Limited | Real estate | 2010 |
| Hills Construction Limited | Extraterritorial | 2022 |
| Hills Contractors & Construction Limited | Construction | 1991 |
| Hills Group Self Storage Limited | Real estate | 2019 |
| Hills Homes Limited | Construction | 2020 |
| Hills Living Limited | Construction | 2020 |
| Hills Residential (Braintree) Limited | Construction | 2022 |
| Hills Residential Construction Ltd | Construction | 2000 |
| Hills Self Storage (Hythe) Limited | Real estate | 2024 |
| Hills Self Storage Limited | Real estate | 2019 |
| Hills Woodland Limited | Extraterritorial | 2022 |
| Hillside Mews Property Management Limited | Households | 2004 |
| Hilltop Boarding Kennels & Cat Hotel Ltd | Wholesale & retail | 2015 |
| Hillyard Roofing Group Ltd | Construction | 2026 |
| Hillyard Roofing Ltd | Construction | 2013 |
| Hillz Electrical Limited | Construction | 2020 |
| Hilton House (Essex) Limited | Health & social care | 2008 |
| Himsworth Limited | Financial services | 2025 |
| Hinkins Limited | Professional & scientific | 2005 |
| Hinson Heating Ltd | Construction | 2025 |