| Hanson (FH) Limited | Financial services | 1998 |
| Hanson (FP) Limited | Financial services | 1986 |
| Hanson (Hple) Limited | Financial services | 1969 |
| Hanson (LBC) Limited | Professional & scientific | 1962 |
| Hanson (MR) Limited | Professional & scientific | 1978 |
| Hanson (Nail) Limited | Financial services | 1941 |
| Hanson (Rbmc) Limited | Professional & scientific | 1931 |
| Hanson (SH) Limited | Financial services | 2005 |
| Hanson Aggregates (North) Limited | Professional & scientific | 1997 |
| Hanson Aggregates Limited | Professional & scientific | 1990 |
| Hanson Aggregates Marine Limited | Mining & quarrying | 1950 |
| Hanson Aggregates South Wales Holdings Limited | Financial services | 1942 |
| Hanson Aggregates South Wales Limited | Financial services | 1961 |
| Hanson Aggregates UK Limited | Financial services | 1970 |
| Hanson America Holdings (1) Limited | Professional & scientific | 1995 |
| Hanson America Holdings (2) Limited | Professional & scientific | 1995 |
| Hanson America Holdings (3) Limited | Financial services | 1995 |
| Hanson America Holdings (4) Limited | Professional & scientific | 1995 |
| Hanson Bath and Portland Stone Limited | Professional & scientific | 1960 |
| Hanson Batteries Limited | Financial services | 1988 |
| Hanson Blocks North Limited | Professional & scientific | 1958 |
| Hanson Brick Ltd | Professional & scientific | 1994 |
| Hanson Building Materials Europe Limited | Financial services | 1989 |
| Hanson Building Materials Limited | Financial services | 1950 |
| Hanson Building Products (2003) Limited | Financial services | 1989 |
| Hanson Canada Limited | Professional & scientific | 1988 |
| Hanson Clay Products Limited | Professional & scientific | 1976 |
| Hanson Concrete Products Limited | Financial services | 1954 |
| Hanson Crewing Services Limited | Professional & scientific | 2001 |
| Hanson Facing Bricks Limited | Financial services | 1989 |
| Hanson Finance (2003) Limited | Financial services | 1973 |
| Hanson Finance Limited | Financial services | 2003 |
| Hanson Financial Services Limited | Financial services | 1989 |
| Hanson Funding (G) Limited | Financial services | 1991 |
| Hanson H4 Limited | Professional & scientific | 1954 |
| Hanson H5 | Professional & scientific | 1987 |
| Hanson Hedging (Dollars) (1) Limited | Financial services | 1937 |
| Hanson Holdings (1) Limited | Financial services | 1989 |
| Hanson Holdings (2) Limited | Financial services | 1996 |
| Hanson Holdings (3) Limited | Financial services | 2005 |
| Hanson Holdings Limited | Financial services | 2004 |
| Hanson Industrial (Engineering Holdings) Limited | Financial services | 1989 |
| Hanson Industrial Limited | Financial services | 1989 |
| Hanson International Holdings Limited | Financial services | 1989 |
| Hanson Land Development Limited | Financial services | 1958 |
| Hanson Limited | Financial services | 2002 |
| Hanson Marine Holdings Limited | Financial services | 1980 |
| Hanson Marine Limited | Financial services | 1955 |
| Hanson Overseas Corporation Limited | Professional & scientific | 1966 |
| Hanson Overseas Holdings Limited | Financial services | 1996 |
| Hanson Packed Products Limited | Manufacturing | 1888 |
| Hanson Peabody Limited | Financial services | 1996 |
| Hanson Pension Trustees Limited | Professional & scientific | 1977 |
| Hanson Quarry Products Europe Limited | Mining & quarrying | 1935 |
| Hanson Quarry Products Holdings Limited | Financial services | 1887 |
| Hanson Quarry Products Trade Finance Limited | Professional & scientific | 1966 |
| Hanson Quarry Products Transport Limited | Professional & scientific | 1941 |
| Hanson Quarry Products Ventures Limited | Financial services | 1989 |
| Hanson Retail Limited | Financial services | 1989 |
| Hanson Thermalite Limited | Professional & scientific | 1983 |
| Hanson TIS Holdings Limited | Financial services | 2000 |
| Hanson TIS Limited | Professional & scientific | 1995 |
| Hanson Trust Limited | Financial services | 1910 |
| Hanson Trustees Limited | Professional & scientific | 1994 |
| Hanson Zandi Advertising Limited | Professional & scientific | 1985 |
| Hanzon Ltd | Education | 2023 |
| Happence Limited | Health & social care | 2021 |
| Happened in Marbella Ltd. | Information & communication | 2013 |
| Harben Health Limited | Health & social care | 2023 |
| Harber Signs Limited | Professional & scientific | 2011 |
| Harboran Limited | Extraterritorial | 1994 |
| Harbour Associates Limited | Administrative & support | 2018 |
| Hardedge (Maidenhead) Limited | Wholesale & retail | 1999 |
| Hare Hatch Properties Limited | Real estate | 2003 |
| Hare Prop Ltd | Real estate | 2022 |
| Harefield Farming Ltd | Agriculture & fishing | 2021 |
| Harekrishna Consulting Ltd | Information & communication | 2014 |
| Hark Films Ltd | Information & communication | 2022 |
| Harley Medical Supplies Ltd | Manufacturing | 2021 |
| Harlow Consulting Limited | Professional & scientific | 2003 |
| Harmony Alternative Education Limited | Education | 2017 |
| Harpal 7 Enterprises Ltd | Construction | 2020 |
| Harper Productions Ltd | Information & communication | 2013 |
| Harrisons Limeworks Limited | Professional & scientific | 1977 |
| Harrow Tool Hire & Sales Limited | Wholesale & retail | 2010 |
| Harsha Limited | Professional & scientific | 2015 |
| Hartamlea Designs Limited | Professional & scientific | 2025 |
| Hartsholme Property Limited | Professional & scientific | 1939 |
| Hartvi Technologies Limited | Administrative & support | 2025 |
| Harvest Property Services Limited | Real estate | 2017 |
| HARVEST2HOME Ltd | Wholesale & retail | 2025 |
| Harwoods Plumbing and Heating Ltd | Construction | 2023 |
| Hashir Haaris Hakeem Ltd | Manufacturing | 2021 |
| Hassium Innovation Technologies and Services Ltd | Information & communication | 2024 |
| Hasting Bray Consulting Ltd | Information & communication | 2014 |
| Hatch Gardens Residents Management Company Limited | Households | 2014 |
| Haulfryn Group Limited | Hospitality | 1935 |
| Haulfryn Holdings Limited | Financial services | 2021 |
| Haulfryn Limited | Hospitality | 2017 |
| Haute Elite Chauffeur Ltd | Transport & logistics | 2025 |