| HCF Services Ltd | Administrative & support | 2017 |
| HCS Sales Limited | Wholesale & retail | 2023 |
| HCV Holdings Ltd | Professional & scientific | 2023 |
| Hcwc Holdings Limited | Real estate | 2020 |
| HDB Brothers Ltd | Construction | 2016 |
| Hdots Ltd | Professional & scientific | 2018 |
| HE Automotors Ltd | Wholesale & retail | 2025 |
| HE Events Ltd | Professional & scientific | 2023 |
| Head Design Limited | Professional & scientific | 1993 |
| Head to TOE Therapy Limited | Other services | 1999 |
| Headingley Chiropractic Clinic Ltd | Health & social care | 2002 |
| Heal Music Ltd | Information & communication | 2025 |
| Heal the World Ministries | Other services | 2026 |
| Healing Psychotherapy and Counselling Ltd | Other services | 2022 |
| Health Emporium Limited | Agriculture & fishing | 2006 |
| Health Matters London Limited | Hospitality | 2008 |
| Health Systems Dynamics Ltd | Professional & scientific | 2013 |
| Healthcare Informatics Ltd | Information & communication | 2023 |
| Healthware Services Ltd | Professional & scientific | 2022 |
| Heaney Ltd | Construction | 2024 |
| Heart Aflutter Bridal Ltd | Wholesale & retail | 2014 |
| Heart Facilities Limited | Administrative & support | 2016 |
| Heartlines Limited | Health & social care | 2021 |
| Heat Global Solutions Ltd | Wholesale & retail | 2024 |
| Heat Pump Projects Limited | Construction | 2021 |
| Heath Hill Investments Limited | Administrative & support | 2025 |
| Heathfield Close Property Management Limited | Households | 1964 |
| Heathplace Limited | Hospitality | 1995 |
| Heathtrack Investments Limited | Real estate | 2011 |
| Heating Pump Technologies Limited | Construction | 2012 |
| Heatline London Ltd | Construction | 2020 |
| Heatmaster London Ltd | Construction | 2016 |
| Heavenly Footwear Limited | Wholesale & retail | 2023 |
| Hectorside Limited | Wholesale & retail | 1973 |
| Heddoncourt Limited | Professional & scientific | 2018 |
| Heisenberg Technologie Ltd | Wholesale & retail | 2014 |
| Helen Health Ltd | Wholesale & retail | 2020 |
| Helena (UK) Limited | Administrative & support | 2009 |
| Helios Financial Services Ltd | Financial services | 2012 |
| Helix Creative Design Limited | Construction | 2001 |
| Helix Property Maintenance Limited | Construction | 2021 |
| HELPYOU2GOADVERT Limited | Professional & scientific | 2024 |
| Helveticor (UK) Ltd | Transport & logistics | 2026 |
| Hemas Investments Ltd | Real estate | 2025 |
| Hemas Property Investment Ltd | Real estate | 2018 |
| Hemp 2 Wellness Ltd | Wholesale & retail | 2016 |
| Henan Financial Consultants Limited | Professional & scientific | 2006 |
| Henbel Property Limited | Real estate | 2025 |
| Henbrandt Properties Limited | Administrative & support | 2016 |
| Henicor Ltd | Professional & scientific | 2018 |
| Henrietta Costume Limited | Information & communication | 2022 |
| Henry James Homes Ltd | Real estate | 2014 |
| Henry Planning Limited | Professional & scientific | 2016 |
| Heraclon Limited | Financial services | 2011 |
| Herbert Multi Trade Limited | Construction | 2018 |
| Herby Studio Ltd | Arts & recreation | 2016 |
| Herdcha Ltd | Information & communication | 2025 |
| Herencia Resources PLC | Administrative & support | 2005 |
| Hergren Investments Limited | Construction | 1960 |
| Heritage Gateway Ltd | Real estate | 2020 |
| Heritage Rocks Ltd | Administrative & support | 2013 |
| Herman Otto Engineering Ltd | Administrative & support | 2016 |
| Hermes KPM Investments Limited | Real estate | 2014 |
| Hermes Lakshmi Ltd | Administrative & support | 2014 |
| Hermits United Ltd | Information & communication | 2022 |
| Hero Estates Limited | Real estate | 2011 |
| Heron Events Ltd | Arts & recreation | 2019 |
| Heronmind Ltd | Professional & scientific | 2025 |
| Hertford Car Sales Ltd | Wholesale & retail | 2017 |
| Hertfordshire Green Beans Ltd | Wholesale & retail | 2025 |
| Hertfordshire Management and Development Ltd | Construction | 2016 |
| Hertingfordbury Park (2018) Management Company Limited | Other services | 2018 |
| Herts Investment Holdings Limited | Real estate | 2012 |
| Herts Property Investments Limited | Real estate | 2005 |
| Herts Real Estate Limited | Real estate | 2012 |
| Herts Ultimate Limited | Wholesale & retail | 2013 |
| Hesykhia Consulting Ltd | Professional & scientific | 2025 |
| Hexagon Hall Limited | Wholesale & retail | 2021 |
| Hexblock Limited | Real estate | 2018 |
| HF Global Services (PVT.) Limited | Other services | 2014 |
| HFI Consultancy Ltd | Wholesale & retail | 2023 |
| HFY Ltd | Administrative & support | 2024 |
| HG Financial Limited | Financial services | 2013 |
| HGS Properties (Curnick’S RD Norwood) Ltd | Construction | 2018 |
| HGS Properties (Leeson Building Leicester) Ltd | Construction | 2019 |
| HHC28 Properties Limited | Administrative & support | 2016 |
| Hi-Nest Limited | Real estate | 2025 |
| Hidef Software Ltd | Information & communication | 2014 |
| Hield UK Limited | Professional & scientific | 1994 |
| High Barnet Investments Ltd | Real estate | 2013 |
| High Oak,Ware(Management)Limited | Households | 1969 |
| High Oaks (Enfield) Management Company Limited | Households | 1969 |
| High Rise Properties Limited | Real estate | 1998 |
| High Trees 1071 Freehold Ltd | Households | 2016 |
| High Trees Investment Ltd | Administrative & support | 2017 |
| Highbury Grove Limited | Real estate | 2024 |
| Highclere Designs Ltd | Professional & scientific | 2000 |
| Higher Health London Ltd | Health & social care | 2016 |
| Higher Staffing Ltd | Administrative & support | 2021 |
| Highfield Court Ltd | Construction | 2022 |