| Havas E Group Limited | Professional & scientific | 2015 |
| Havas Forward Media UK Limited | Professional & scientific | 2025 |
| Havas Helia Limited | Professional & scientific | 1990 |
| Havas Holdings Limited | Professional & scientific | 2005 |
| Havas Market Limited | Information & communication | 2016 |
| Havas Market UK Limited | Information & communication | 2005 |
| Havas Media Limited | Professional & scientific | 1987 |
| Havas People Limited | Professional & scientific | 1993 |
| Havas PR UK Limited | Professional & scientific | 1985 |
| Havas Programmatic Hub Limited | Professional & scientific | 2014 |
| Havas Shared Services Limited | Professional & scientific | 1901 |
| Havas SO Group Ltd | Professional & scientific | 2015 |
| Havas UK Limited | Professional & scientific | 1993 |
| Havas Worldwide London Limited | Professional & scientific | 1998 |
| Haven at Home Care Ltd | Health & social care | 2025 |
| Havn Holdings Limited | Financial services | 2025 |
| Havn Retail Opco Limited | Wholesale & retail | 2022 |
| Hawden Executive Placements Ltd | Administrative & support | 2024 |
| Haweli Ilford Ltd | Hospitality | 2020 |
| Haweli Southall Ltd | Hospitality | 2023 |
| Hawkes Security Systems Ltd | Administrative & support | 2021 |
| Hawkeye Asset Investments Ltd | Real estate | 2024 |
| Hawkeye Enterprise Limited | Wholesale & retail | 2007 |
| Hawkland Services Ltd | Hospitality | 2019 |
| Hawley Garden Centre and Nursery Limited | Wholesale & retail | 1981 |
| Hawthorn Place (Coxheath) Ltd | Households | 2021 |
| Hawthorn Property Services Kent Limited | Real estate | 2026 |
| Hawthorn Property Services Ltd | Real estate | 2024 |
| Hayes Letting Ltd | Real estate | 2024 |
| Haygreen Cars Limited | Extraterritorial | 2025 |
| Hayle Construction Limited | Construction | 2024 |
| Haynes Brothers Holdings Ltd | Wholesale & retail | 2025 |
| Haynesworld Limited | Administrative & support | 2011 |
| Hayre House Ltd | Real estate | 2025 |
| Hayris Events Ltd | Extraterritorial | 2022 |
| Hayward Classics & Sons Limited | Other services | 2015 |
| Hayward Classics Engineering Limited | Other services | 2015 |
| Hayward Group Limited | Information & communication | 1997 |
| Hayward Medical Communications Limited | Information & communication | 1991 |
| HAZ Enterprises Ltd | Construction | 2017 |
| Hazell & Hamlett's Ltd | Wholesale & retail | 2020 |
| Hazelwood Joinery and Conservation Ltd | Construction | 2018 |
| HB Homes South Ltd. | Construction | 2018 |
| Hbee Properties Limited | Hospitality | 2018 |
| HBO Consulting Ltd | Information & communication | 2007 |
| HBS South East Ltd | Construction | 2020 |
| Hcbe-Uk | Public administration | 2025 |
| HCD Legal Limited | Professional & scientific | 2021 |
| Hcs-Food Ltd | Administrative & support | 2002 |
| HD Develop & Build Limited | Professional & scientific | 2014 |
| HD Machinery Ltd | Wholesale & retail | 2020 |
| HD Performance Team Limited | Arts & recreation | 2025 |
| HDE Nurseries Ltd | Education | 2016 |
| HDE Properties Limited | Real estate | 2025 |
| HDM Investments Ltd | Financial services | 2017 |
| HDR Visual Communication Limited | Professional & scientific | 2005 |
| Hdysba Ltd | Wholesale & retail | 2025 |
| Headcorn Car Wash Ltd | Administrative & support | 2013 |
| Headcorn DRY Cleaners Limited | Other services | 2009 |
| Headcorn Station Coffee Stop Ltd | Hospitality | 2020 |
| Headland Hospitality Ltd | Professional & scientific | 2023 |
| Heads UP Electrical Ltd | Construction | 2018 |
| Heads UP Television Ltd | Information & communication | 2009 |
| Headspace Holdings Ltd | Financial services | 2014 |
| Healing Through Horses Ltd | Other services | 2021 |
| Health Active Ltd | Wholesale & retail | 2020 |
| Health HUT Nutrition Ltd | Other services | 2024 |
| Health Wings Limited | Health & social care | 2024 |
| Healthcare Direct Services Ltd | Administrative & support | 2016 |
| Healthcare Financial Services Limited | Professional & scientific | 2010 |
| Healthcare UK Properties Limited | Real estate | 2025 |
| Hearn's Properties Limited | Real estate | 2018 |
| Hearne Court Management Limited | Households | 2020 |
| Heart of a Shark Limited | Information & communication | 2018 |
| Heart of Kent Property Ltd | Real estate | 2025 |
| Heart to Sole Ltd | Health & social care | 2020 |
| Hearthstar Homes Ltd | Real estate | 2026 |
| Heartmind Ltd | Financial services | 2025 |
| Hearwiser Ltd | Manufacturing | 2025 |
| Heated Mechanical Services Ltd | Construction | 2023 |
| Heath Finance Company Limited | Financial services | 2013 |
| Heath Road Coxheath Management Limited | Administrative & support | 2020 |
| Heathside Electrical Services Ltd | Construction | 2026 |
| Heathwick Solutions AOG Limited | Transport & logistics | 1995 |
| Heaven Spring Limited | Wholesale & retail | 2017 |
| Heavenra Ltd | Wholesale & retail | 2025 |
| Hecton Properties Limited | Real estate | 2015 |
| Hector Matthews Holdings Limited | Professional & scientific | 2025 |
| Hedgeberry Ltd | Agriculture & fishing | 2017 |
| Hedgerow Game Ltd | Manufacturing | 2016 |
| HEF Property Ltd | Real estate | 2025 |
| Hegde Consulting Limited | Administrative & support | 2023 |
| Heights Healthcare Ltd | Health & social care | 2015 |
| Heikkilä Holdings Ltd | Financial services | 2020 |
| Heimdal Media Limited | Administrative & support | 2002 |
| Heirloom Estates Ltd | Real estate | 2024 |
| Helena K Martin Ltd | Arts & recreation | 2016 |
| Helenslee Ltd | Professional & scientific | 2024 |
| Helen’S Studio Ltd | Other services | 2025 |
| Heleora International Store Ltd | Hospitality | 2025 |