| HHA Cars Limited | Transport & logistics | 2017 |
| Hhclinic Ltd | Health & social care | 2026 |
| HHL Cars and Vans Ltd | Wholesale & retail | 2023 |
| HHL Property Ventures Limited | Real estate | 2021 |
| HHL Ventures 1 Limited | Real estate | 2019 |
| HI Spec Cleaning Ltd | Administrative & support | 2016 |
| Hi-Velocity UK Limited | Wholesale & retail | 2010 |
| Hickford Property One Limited | Real estate | 2020 |
| Hickman & Co (Essex) Ltd | Construction | 2022 |
| Hidden Art Services Limited | Wholesale & retail | 2024 |
| Hidden Rare Ltd | Wholesale & retail | 2017 |
| High Clean Ltd | Administrative & support | 2016 |
| High Level Holdings Limited | Construction | 2016 |
| High Power Petroleum Services UK Limited | Administrative & support | 2017 |
| High Trees Court Warley (Brentwood) Residents Association Limited | Households | 1982 |
| Highams Residents Association Limited | Real estate | 1987 |
| Highboard Ltd | Real estate | 2025 |
| Highfield Commercial Property Ltd | Real estate | 2025 |
| Highview Gardens Residents Limited | Households | 2024 |
| Highway Workforce Limited | Construction | 2017 |
| Hilborn Management Company Limited | Households | 2019 |
| Hillcrest Holdings Limited | Real estate | 2016 |
| Hillier HOW Limited | Professional & scientific | 2024 |
| Hilltop Barn Investments Ltd | Real estate | 2021 |
| Hillway Associates Limited | Professional & scientific | 2024 |
| Hillway Construction Limited | Construction | 2025 |
| Hilt Building LLP | | 2024 |
| Hilt Material Supplies Ltd | Wholesale & retail | 2024 |
| Hinxhill Park (Ashford) Management Company Limited | Real estate | 2019 |
| Hitayush Ltd | Financial services | 2026 |
| Hive Procurement Ltd | Construction | 2022 |
| Hivemen Ltd | Administrative & support | 2025 |
| HJD Scaffolding Limited | Construction | 2022 |
| HJS London Ltd | Real estate | 2022 |
| HLT Consulting Ltd | Administrative & support | 2009 |
| HLW Productions Ltd | Information & communication | 2022 |
| HM Operations Limited | Professional & scientific | 2026 |
| Hobby Cards and Stuff Limited | Wholesale & retail | 2025 |
| Hodges Search Holdings Limited | Financial services | 2025 |
| Hodges Search Limited | Professional & scientific | 2017 |
| Hodgkinson Educational Consultancy Ltd | Education | 2015 |
| Holborn ABC LLP | | 2007 |
| Holburn Property Family Partnership LLP | | 2019 |
| Holden & Salter Design Build Ltd | Construction | 2026 |
| Holdgate Design & Development Ltd | Information & communication | 2013 |
| Holgate Construction (London) Ltd | Construction | 2018 |
| Holgate Electrical Services Ltd | Real estate | 2014 |
| Holiday Best Limited | Administrative & support | 2022 |
| Holistic Health Complete Ltd | Health & social care | 2025 |
| Holland Park Surveying and Construction Ltd | Professional & scientific | 2022 |
| Holland Welding Fabricators Limited | Manufacturing | 2019 |
| Hollie Bailey Creative Ltd | Professional & scientific | 2018 |
| Hollingshead Car Company Ltd | Wholesale & retail | 2021 |
| Hollington Associates Limited | Administrative & support | 2012 |
| Hollys Sparkly Party Hires Ltd | Arts & recreation | 2023 |
| Holmwood Partners Limited | Professional & scientific | 2024 |
| Holtair Limited | Energy | 2023 |
| Holyhead Stop and Storage Solutions Ltd | Transport & logistics | 2025 |
| Home Clean Direct Limited | Administrative & support | 2016 |
| Home Counties Carpet & Flooring Ltd | Wholesale & retail | 2021 |
| Home Counties Traffic Management Limited | Construction | 2025 |
| Home County Candle Co Limited | Manufacturing | 2019 |
| Home Expert 4 U Ltd | Construction | 2024 |
| Home Remedies Limited | Wholesale & retail | 2023 |
| Home Trends 24/7 Ltd | Wholesale & retail | 2020 |
| Homes for Care & Living CIC | Health & social care | 2025 |
| Homesafe Essex Limited | Public administration | 2017 |
| Homestatus Ltd | Information & communication | 2025 |
| Homite Limited | Professional & scientific | 2024 |
| Hook House Property Management Ltd | Real estate | 2021 |
| Hoops Basketball Ltd | Arts & recreation | 2021 |
| Hopedima Engineering Limited | Manufacturing | 2012 |
| Hopefield Pet Care Services Ltd | Other services | 2026 |
| Hopefield Properties Limited | Financial services | 2022 |
| Hopkins Arbitration Limited | Administrative & support | 2022 |
| Hoppit House Limited | Real estate | 2025 |
| Hopway Ltd | Real estate | 2026 |
| Hornagold & Hills | | 1994 |
| Hornsby Property Ltd. | Real estate | 2021 |
| Horton Honours Limited | Professional & scientific | 2014 |
| Houghton Regis Parcel 8 Residents Management Company Limited | Households | 2022 |
| Hourglass Media Productions Limited | Information & communication | 2020 |
| House of Brick Productions Ltd | Professional & scientific | 2017 |
| House-Architecture Ltd | Professional & scientific | 2016 |
| Household Consulting Ltd | Professional & scientific | 2025 |
| Housela Ltd | Real estate | 2021 |
| Housing LEO Ltd | Real estate | 2025 |
| Housing Sites Limited | Real estate | 2007 |
| Howard Kelly Consultants Limited | Professional & scientific | 2010 |
| Howe & TAN Limited | Health & social care | 2009 |
| HP Barbican Limited | Administrative & support | 2015 |
| Hprix Prime Ltd | Wholesale & retail | 2025 |
| HQ Consultancy Ltd | Professional & scientific | 2015 |
| HR Consulting (London) Limited | Professional & scientific | 2018 |
| Hsqevolve Ltd | Professional & scientific | 2022 |
| HTR Financial Consulting Ltd | Financial services | 2014 |
| Hub Estates Limited | Real estate | 2021 |
| Hudson and Clarke Limited | Extraterritorial | 2018 |
| Hudson Clarke Associates Limited | Administrative & support | 2004 |
| Hudson Druce Associates Limited | Professional & scientific | 2014 |