| Gwynedd Close Management Company Limited | Real estate | 2013 |
| GY Gold Corp Ltd | Other services | 2022 |
| H Corbett Ltd | Professional & scientific | 2025 |
| H L Solutions Limited | Information & communication | 2014 |
| H Smith and SON Removals Limited | Transport & logistics | 2022 |
| H&Co (London) Ltd | Other services | 2019 |
| H&S Construction Ltd | Construction | 2017 |
| H.C. International (Trading) Limited | Professional & scientific | 1996 |
| H.R. Property Investments Kent Ltd | Construction | 2013 |
| H1 Barbers Biggin Hill Ltd | Other services | 2025 |
| H20 Congo Limited | Education | 2013 |
| H20 Legal Limited | Administrative & support | 2015 |
| Ha-Roost Investments Ltd. | Education | 2021 |
| Ha-Roost Property Ltd | Real estate | 2020 |
| HAB Asset Holdings Ltd | Real estate | 2025 |
| HAB Property Holdings Ltd | Real estate | 2019 |
| Habitat PG Holding Limited | Real estate | 2026 |
| Hacktan Barbers Ltd | Other services | 2018 |
| Hadlow & Sons Landscaping Ltd | Administrative & support | 2024 |
| Hair 2 UK Limited | Real estate | 2008 |
| Hair and Holistic Ltd | Other services | 2025 |
| Haji Taslim Funerals Limited | Other services | 2012 |
| Halim (Holdings) Limited | Financial services | 2000 |
| Hall & Hall Consultancy Ltd | Professional & scientific | 2019 |
| Hannah Courtney Bennett Ltd | Health & social care | 2003 |
| Harris Piper Ltd | Real estate | 2022 |
| Harry Joseph Homes Ltd | Real estate | 2023 |
| Harts Happy Hounds Ltd | Other services | 2025 |
| Hawthorn Hearing Ltd | Health & social care | 2023 |
| Hayward Holdings Limited | Financial services | 2021 |
| Hayward Investments Limited | Real estate | 2021 |
| HC Lawrence and Sons Limited | Wholesale & retail | 2011 |
| Health Tribe Limited | Health & social care | 2015 |
| Helen Whitaker Teacher Training Limited | Health & social care | 2023 |
| Helical Systems Limited | Manufacturing | 2001 |
| Helix IT Solutions Ltd | Information & communication | 2022 |
| Hellenic Olive Products Limited | Wholesale & retail | 2001 |
| Helmet City.Co.Uk Limited | Administrative & support | 2010 |
| Herald House Limited | Real estate | 2018 |
| Herbert & Co Services Limited | Construction | 2011 |
| HG Accounting Solutions Limited | Professional & scientific | 2010 |
| High Definition Ductwork Ltd | Professional & scientific | 2019 |
| High Level Clean Limited | Administrative & support | 2023 |
| High Street Chambers Developments Limited | Construction | 2013 |
| Highlife Homes Ltd | Construction | 2014 |
| Hilders Farm Management Company Limited | Households | 2024 |
| Hilders Lane Limited | Construction | 2013 |
| Hillside Tippers Ltd | Transport & logistics | 2009 |
| Historalia Services UK Limited | Hospitality | 2024 |
| Historalia UK Limited | Arts & recreation | 2023 |
| Hisui Housing Ltd | Real estate | 2025 |
| Hivecru Ltd | Administrative & support | 2024 |
| HJL Building Services Ltd | Construction | 2019 |
| HLM Development Services Ltd | Construction | 2019 |
| HNS Fire Safety Ltd | Professional & scientific | 2025 |
| Holistic Meadow Ltd | Other services | 2019 |
| Holleo UK Limited | Construction | 2017 |
| Holly Marie Limited | Administrative & support | 2025 |
| Holmes Homes Ltd | Real estate | 2011 |
| Home Connect Services Limited | Administrative & support | 2020 |
| Homecastle Estate Agents Limited | Real estate | 2008 |
| Honeybees After School Club Ltd | Health & social care | 2018 |
| Honeybees Wrap Around Care Ltd | Health & social care | 2023 |
| Hook Construction Limited | Construction | 2000 |
| Hoop Architecture Limited | Professional & scientific | 2013 |
| Horsing Around Transport Limited | Administrative & support | 2003 |
| Hortons Way Storage Limited | Transport & logistics | 2018 |
| Howard Bros. & Strong Limited | Real estate | 1947 |
| Howard New Aircraft and General Cleaning Ltd | Administrative & support | 2015 |
| HPM Events Ltd | Arts & recreation | 2024 |
| HR Consultancy Services Ltd | Administrative & support | 2017 |
| HS Cullen Group Ltd | Wholesale & retail | 2024 |
| HS Social Circle Ltd | Other services | 2019 |
| HSK Designs Limited | Transport & logistics | 2020 |
| Hughes Publisher Services Ltd | Information & communication | 2016 |
| Hugill and Brown Electrical Services Ltd | Construction | 2021 |
| Huntleypropertyservices Limited | Real estate | 2025 |
| Hy-Scaff Design-Management-Consultancy Ltd | Professional & scientific | 2022 |
| Hyhurst Group Limited | Extraterritorial | 2020 |
| Hyhurst Properties Limited | Real estate | 1995 |
| Hypo-Fuel Ltd | Manufacturing | 2026 |
| Hyra Limited | Information & communication | 2021 |
| I CAN Travel Limited | Professional & scientific | 2003 |
| I Grummitt Hair and Makeup Ltd | Other services | 2023 |
| IAH (NED) Ltd | Hospitality | 2019 |
| IAN Chipchase Properties Ltd | Real estate | 2022 |
| Ibex Technology Ltd | Information & communication | 2006 |
| Igloo Ice South East LP | | 2012 |
| Iheat London Ltd | Construction | 2020 |
| Imperial Jade Yunnan Specialists Ltd | Wholesale & retail | 2021 |
| Independent Image Limited | Information & communication | 1989 |
| Indian Summer Westerham Restaurant Ltd | Hospitality | 2025 |
| Infinity Signs Ltd | Other services | 2019 |
| Inspired Through Sport Ltd | Arts & recreation | 2014 |
| Instaglass Limited | Construction | 2013 |
| Instant Golf Travel Limited | Wholesale & retail | 2026 |
| Institutional Adviser Limited | Professional & scientific | 2020 |
| Instrument and Control Consulting Limited | Professional & scientific | 2012 |
| Intercept Fire Safety Limited | Public administration | 2023 |
| Interflight Ltd | Manufacturing | 2023 |