| Hankhook Limited | Administrative & support | 2005 |
| Hanron Jewellery Limited | Wholesale & retail | 1993 |
| Hanson Street Properties Limited | Construction | 1972 |
| Hapfield Limited | Wholesale & retail | 2009 |
| Hardaker Security Services Limited | Other services | 2019 |
| Harehatch FH Limited | Administrative & support | 2024 |
| Haresfoot Limited | Construction | 2022 |
| Harmill Landscapes Ltd | Administrative & support | 2023 |
| Harmon Properties Limited | Real estate | 2016 |
| Harmon Properties Two Limited | Real estate | 2018 |
| Harmony by KEE Ltd | Arts & recreation | 2025 |
| Harold Woods Ltd | Professional & scientific | 2022 |
| Harper FOX Partners Ltd | Administrative & support | 2018 |
| Harper Real Estate Limited | Professional & scientific | 2013 |
| Harrison Build Ltd | Construction | 2025 |
| Harrison Civils Construction Limited | Construction | 2022 |
| Harrison Civils Limited | Water & waste | 2009 |
| Harry Fairhead Limited | Agriculture & fishing | 1936 |
| Hartplace Limited | Administrative & support | 2003 |
| Hartsmoor Ltd | Wholesale & retail | 2020 |
| Harv Limited | Financial services | 2022 |
| Harvzen Ltd | Construction | 2024 |
| Haslers Assurance LLP | | 2006 |
| Haslers Business Services LLP | | 2018 |
| Haslers Corporate Finance LLP | | 2004 |
| Haslers Insolvency Services LLP | | 2009 |
| Haslers LLP | | 2011 |
| Haslers Planning Limited | Financial services | 2014 |
| Haslers Trustee Services Limited | Administrative & support | 2009 |
| Haslers Trustees Limited | Administrative & support | 2000 |
| Hassenbrook House Management Limited | Households | 2003 |
| Hastingwood Park Management Limited | Households | 2019 |
| Hataitai Management Limited | Professional & scientific | 2017 |
| Hatton and Hyde Ltd | Wholesale & retail | 2025 |
| Hautes Solutions Limited | Professional & scientific | 2025 |
| Havber Food & Wine Ltd | Wholesale & retail | 2013 |
| Haven Services Limited | Real estate | 2016 |
| Havengate Holdings Ltd | Real estate | 2026 |
| Havers Ironing Service Limited | Other services | 1997 |
| Hawk London Ltd | Information & communication | 2020 |
| Hawk Personnel Limited | Administrative & support | 2023 |
| Hawke Services Limited | Administrative & support | 2016 |
| Hayes Point (Sully) Limited | Administrative & support | 2003 |
| Haylink 2 Limited | Administrative & support | 2022 |
| Haylink Limited | Administrative & support | 1999 |
| Haym Healthcare Limited | Health & social care | 2021 |
| Haypex HR Ltd | Administrative & support | 2021 |
| Hayre Investments (Reet Gardens) Limited | Real estate | 2015 |
| Hayre Investments (Slough) Limited | Real estate | 2014 |
| Haywards Heath Developments Limited | Administrative & support | 2015 |
| Hazelwood Forest Investments Limited | Professional & scientific | 2023 |
| Hazergul Ltd | Hospitality | 2023 |
| HB Broxbourne Ltd | Hospitality | 2023 |
| HB Chingford Ltd | Hospitality | 2025 |
| HB Kingscross Ltd | Hospitality | 2023 |
| HB Ware Ltd | Hospitality | 2023 |
| Hdpc Ltd | Professional & scientific | 2011 |
| Hdpi LLP | | 2022 |
| Headcorn Constructions Ltd | Real estate | 2016 |
| Headstart Colchester Limited | Health & social care | 2023 |
| Heales Visuals Limited | Information & communication | 2019 |
| Health Education Partnership Limited | Education | 2010 |
| Healthier YOU Nutrition Limited | Other services | 2024 |
| Healthy Living Products (London) Ltd | Wholesale & retail | 2026 |
| Heartpride Limited | Construction | 2002 |
| Heatico Ltd | Construction | 2023 |
| Heaven Recruitment Consultants Limited | Information & communication | 2009 |
| Helen Tyler Educational Services Ltd | Education | 2014 |
| Helen Weighell Psychotherapy Limited | Health & social care | 2019 |
| Helicad Limited | Administrative & support | 2011 |
| Helioglen Limited | Households | 1985 |
| Hellen Developments 2019 Limited | Real estate | 2019 |
| Hello Handsome Ltd | Other services | 2020 |
| Help Moving on Limited | Real estate | 2026 |
| Helt Properties Limited | Real estate | 2024 |
| Hemel Properties Ltd | Real estate | 2017 |
| Heminstone Limited | Real estate | 2002 |
| Henlo Ltd | Hospitality | 2025 |
| Henry & Brown Getaways Ltd | Hospitality | 2025 |
| HEP Group Limited | Financial services | 2023 |
| Hephzibah Joseph Ltd | Real estate | 2026 |
| Hepta Consulting Ltd | Professional & scientific | 2019 |
| Herald Developments 2015 Limited | Construction | 2015 |
| Hermes Developments Limited | Construction | 2006 |
| Hermitage (BOW) Management Company Limited(The) | Real estate | 1985 |
| Heronsgate Engineering Limited | Professional & scientific | 1999 |
| Herts and Essex Removal and Storage Ltd | Transport & logistics | 2012 |
| Herts Digger Hire Ltd | Administrative & support | 2019 |
| Hexafor Limited | Information & communication | 2013 |
| HFB London Limited | Administrative & support | 2025 |
| HFS Investment Properties Limited | Administrative & support | 2013 |
| Hfsi Limited | Financial services | 2010 |
| Hhbs Ltd | Construction | 2005 |
| Hibberd Imports Limited | Hospitality | 1988 |
| Hickafort Maintenance Limited | Households | 1961 |
| Hide N Seek Limited | Arts & recreation | 2025 |
| Higgins Partnerships 1LRH Ltd | Real estate | 2025 |
| Higgs House Limited | Real estate | 2025 |
| High Beach M&E Services Limited | Professional & scientific | 2023 |
| High Beach Plumbing & Heating Ltd | Construction | 2023 |