| Heeram Ltd | Professional & scientific | 2023 |
| Heeran Construction Limited | Construction | 2005 |
| Helamore Limited | Professional & scientific | 2018 |
| Heldefer Limited | Professional & scientific | 2021 |
| Helens' Place Limited | Hospitality | 2022 |
| Hello Healthy Happy Life Ltd | Wholesale & retail | 2020 |
| Hemajay Property Investment Limited | Real estate | 2017 |
| Hemant Patel Orthodontist Ltd | Health & social care | 2018 |
| Hemel Pizza House Ltd | Hospitality | 2026 |
| Hemtan Ltd | Other services | 2015 |
| Hemu’S Kitchen Limited | Hospitality | 2025 |
| Hendon Playgroup Limited | Education | 2021 |
| Hendon Reform Synagogue | Other services | 2010 |
| Henfruit Limited | Information & communication | 2014 |
| Henry Saywell Ltd. | Wholesale & retail | 2014 |
| Hensmedics Ltd | Administrative & support | 2015 |
| Henstan Holdings Limited | Financial services | 2016 |
| Henstan Investments Limited | Other services | 2016 |
| Hentes Ltd | Real estate | 2026 |
| Hepcin Limited | Professional & scientific | 2025 |
| Hepcrest Limited | Administrative & support | 2004 |
| Hepmere Limited | Professional & scientific | 2025 |
| Hepmore Ltd | Real estate | 2022 |
| Hepwin Limited | Professional & scientific | 2024 |
| HER Ministry International Ltd | Education | 2025 |
| Herabiotics Ltd | Wholesale & retail | 2022 |
| Herbert Marx Jewellery Ltd | Wholesale & retail | 2019 |
| Herbert Marx Property Limited | Financial services | 2021 |
| Herbiotix Ltd | Wholesale & retail | 2019 |
| Hercules London Productions Limited | Information & communication | 2015 |
| Heritage 4 Limited | Construction | 2020 |
| Heritage ASH Limited | Professional & scientific | 2021 |
| Heritage Global Group Ltd | Administrative & support | 2016 |
| Heritage Global Security Services Ltd | Administrative & support | 2023 |
| Hermitage Finance Limited | Financial services | 1994 |
| Hernia Centres of GT. Britain Limited | Health & social care | 2000 |
| Herons Reach Management Company Limited | Arts & recreation | 1985 |
| Heronsgate Flats Management Company (Edgware) Limited | Households | 1974 |
| Heronsgate Properties (Edgware) Ltd | Households | 2007 |
| Hersudden Limited | Financial services | 2023 |
| Hertford & Willow Courts Limited | Real estate | 1997 |
| Hertfordshire Stays Ltd | Real estate | 2024 |
| Herts Design & Engineering Limited | Professional & scientific | 2016 |
| Herts Insulation Services Limited | | 1975 |
| Hestia Education Ltd. | Health & social care | 2017 |
| Hestia SW11 Limited | Health & social care | 2024 |
| Heterogenz Limited | Information & communication | 2025 |
| Hetley Capital Limited | Real estate | 2022 |
| Heuston Ltd | Real estate | 2025 |
| Hevanly Decor and Care Limited | Wholesale & retail | 2025 |
| Hewco Automation Limited | Professional & scientific | 2025 |
| Hexaterra Limited | Real estate | 2025 |
| Hexora Technologies Limited | Information & communication | 2026 |
| Heymakr Limited | Information & communication | 2026 |
| HFG1 Limited | Real estate | 2024 |
| HFG2 Limited | Real estate | 2025 |
| HFG3 Limited | Real estate | 2025 |
| HFG4 Limited | Real estate | 2025 |
| HFG5 Limited | Real estate | 2025 |
| HFG6 Limited | Real estate | 2025 |
| HFG7 Limited | Real estate | 2026 |
| HFG8 Limited | Real estate | 2026 |
| HFM Security Ltd | Financial services | 2025 |
| HFM Tax & Business Services Limited | Professional & scientific | 2001 |
| HFT Cars Ltd | Wholesale & retail | 2023 |
| HG Electrical Solutions Ltd | Construction | 2020 |
| HHN Industries Limited | Financial services | 2021 |
| HI Carpet Cleaner Ltd | Information & communication | 2020 |
| Hi-Way Hi-Fi Limited | Real estate | 1978 |
| Hibby Gifts Limited | Wholesale & retail | 2023 |
| Hibz Ltd | Manufacturing | 2025 |
| Hidden Beauty Ltd | Administrative & support | 2017 |
| High Standard Painting Ltd | Construction | 2022 |
| High Time Consultation & Academy Ltd | Wholesale & retail | 2021 |
| High Vision Developments Ltd | Construction | 2026 |
| Highgate Silver Deliveries Ltd | Transport & logistics | 2025 |
| Highland Road LLP | | 2026 |
| Hightower Associates Limited | Real estate | 2011 |
| Highview Finance Ltd | Financial services | 2024 |
| Highview Property Investment Company Limited | Real estate | 1958 |
| HIJ Plastering Ltd | Construction | 2020 |
| Hila's Property Ltd | Real estate | 2023 |
| Hilary Wood Historical Characters Limited | Arts & recreation | 2016 |
| Hilcan Limited | Professional & scientific | 2024 |
| Hildan Limited | Professional & scientific | 2007 |
| Hildebrand Mediation Limited | Professional & scientific | 2012 |
| Hill City Consult Ltd | Information & communication | 2023 |
| Hill Security Systems Ltd | Administrative & support | 2015 |
| Hillbeck Investment Ltd | Real estate | 2024 |
| Hillcrest Court RTM Company Limited | Households | 2020 |
| Hillfab Holdings Ltd | Financial services | 2018 |
| Hillflow Limited | Real estate | 2005 |
| Hills Resource Ltd | Health & social care | 2023 |
| Hillsbond Limited | Construction | 2017 |
| Hillside Court Property Company Limited | Households | 2001 |
| Himalaya Asian Foods Ltd | Wholesale & retail | 2020 |
| Himavi Engineering Limited | Professional & scientific | 2016 |
| Himgiri Properties Ltd | Real estate | 2025 |
| Himper Ltd | Wholesale & retail | 2024 |
| Hindocha & Co Limited | Professional & scientific | 2007 |