| GW Rawlinson & Co Limited | Information & communication | 2015 |
| Gwendles Limited | Real estate | 1959 |
| GYM4LESS Borehamwood Limited | Arts & recreation | 2026 |
| GYM4LESS Cafe Ltd | Hospitality | 2026 |
| GYM4LESS Hounslow Limited | Arts & recreation | 2024 |
| GYM4LESS London Ltd | Arts & recreation | 2026 |
| Gyste Ltd | Extraterritorial | 2007 |
| H F M Trust Company Limited | Professional & scientific | 1994 |
| H J V Enterprises Limited | Real estate | 2024 |
| H M Communications Limited | Administrative & support | 2005 |
| H S W Holdings Limited | Financial services | 1997 |
| H V Enterprises Ltd | Real estate | 2019 |
| H&H Air Conditioning Ltd | Other services | 2017 |
| H&H Property Partners Limited | Construction | 2022 |
| H.Baxtertv Ltd | Information & communication | 2016 |
| H2 Investments Limited | Construction | 2000 |
| Hadland Maritime Limited | Professional & scientific | 2018 |
| Hadley Place RES. Assoc. (Weybridge) Limited | Households | 1994 |
| Haestrup International Limited | Administrative & support | 2009 |
| Hagues Domestic Buildings Ltd | Construction | 2022 |
| Hakiemie Rugs Ltd | Wholesale & retail | 2012 |
| Haleon Intermediate Holdings Limited | Financial services | 2022 |
| Haleon Netherlands Capital B.V. | | 2021 |
| Haleon PLC | Professional & scientific | 2021 |
| Haleon UK Capital PLC | Financial services | 2021 |
| Haleon UK Corporate Director Limited | Extraterritorial | 2021 |
| Haleon UK Corporate Secretary Limited | Extraterritorial | 2021 |
| Haleon UK Enterprises Limited | Financial services | 2019 |
| Haleon UK Export Limited | Wholesale & retail | 2020 |
| Haleon UK Finance (USD) Limited | Financial services | 2016 |
| Haleon UK Finance Limited | Financial services | 2014 |
| Haleon UK Holding Canada Limited | Financial services | 2019 |
| Haleon UK Holding New Zealand Limited | Financial services | 2019 |
| Haleon UK Holding SRI Lanka Limited | Financial services | 2015 |
| Haleon UK Holdings (NO.1) Limited | Financial services | 2021 |
| Haleon UK Holdings (NO.2) Limited | Financial services | 2019 |
| Haleon UK Holdings (NO.3) Limited | Financial services | 2021 |
| Haleon UK Holdings (NO.7) Limited | Financial services | 2021 |
| Haleon UK Holdings Limited | Financial services | 2014 |
| Haleon UK IP (NO. 2) Limited | Financial services | 2015 |
| Haleon UK IP Limited | Financial services | 2014 |
| Haleon UK Research Limited | Professional & scientific | 1928 |
| Haleon UK Services Limited | Financial services | 2014 |
| Haleon UK Trading Limited | Wholesale & retail | 2014 |
| Haleon UK Trading Services Limited | Wholesale & retail | 2012 |
| Halestorm PR Limited | Information & communication | 2013 |
| Hall Design Limited | Professional & scientific | 2015 |
| Hall FX Limited | Information & communication | 2017 |
| Hall Place Drive Limited | Households | 2022 |
| Hall Veterinary Consultancy Limited | Professional & scientific | 2010 |
| Hallett and Hallett Limited | Construction | 2015 |
| Hallett and SON Limited | Construction | 2020 |
| Halsey Keetch Ltd | Administrative & support | 2015 |
| Hamic Limited | Construction | 2022 |
| Hamilton Mews (1993) Management Limited | Households | 1993 |
| Hamm Court Limited | Other services | 1956 |
| Hampshire County Classics Limited | Wholesale & retail | 2011 |
| Hampton Court Estates Limited | Real estate | 2005 |
| Hampton Rentals Limited | Real estate | 2023 |
| Hampton Wick Food Wines Ltd | Wholesale & retail | 2023 |
| HAMSTAR2024 Limited | Construction | 2024 |
| Hanif Holdings (GB) Limited | Financial services | 2016 |
| Hanif Private Limited | Administrative & support | 2019 |
| Hanif Residential Limited | Administrative & support | 2018 |
| Hannaford Upright Limited | Professional & scientific | 2000 |
| Hannailey Ltd | Wholesale & retail | 2020 |
| Hannover Asset Management Limited | Professional & scientific | 2015 |
| Hanren Properties Limited | Real estate | 2016 |
| Happi Team Limited | Other services | 2020 |
| Haras Consulting Ltd | Professional & scientific | 2020 |
| Harcourt Global Initiatives Limited | Financial services | 2017 |
| Harcourt Hemp Limited | Agriculture & fishing | 2021 |
| Harcourt Rugby Limited | Construction | 2017 |
| Hardlytrading Limited | Financial services | 2016 |
| Harf Capital Ltd | Financial services | 2016 |
| Harley Street Focal Therapy Centre Ltd | Health & social care | 2026 |
| Harlow Holdings Limited | Construction | 1946 |
| Harmes Turner Brown Limited | Real estate | 2007 |
| Harold Fitzroy Ltd | Administrative & support | 2014 |
| Harper Hybrid Limited | Transport & logistics | 2017 |
| Harper-Jones Limited | Professional & scientific | 2016 |
| Harriet James Property Ltd | Real estate | 2017 |
| Harringtons Sandwiches Limited | Hospitality | 2010 |
| Harrison Clarke Consultants Limited | Construction | 2020 |
| Harry Wolton Limited | Administrative & support | 2010 |
| Hartfinder Two Limited | Energy | 2022 |
| Hartford Corporate Limited | Financial services | 2017 |
| Hartmann Productions Limited | Information & communication | 2024 |
| Harvey HR Limited | Administrative & support | 2018 |
| Hatfields Group Limited | Financial services | 2025 |
| Hawaiian Shirt Photography Ltd | Professional & scientific | 2019 |
| Hawk Pacific Quay Limited | Construction | 2018 |
| Hawk-Eye Innovations Limited | Information & communication | 2001 |
| Hawkesworth Financial Services Limited | Administrative & support | 2003 |
| Hawkins Carpentry and Building Limited | Construction | 2022 |
| Hawkmoor Group International Limited | Financial services | 2014 |
| Hawkmoor Limited | Public administration | 1991 |
| Haxy Limited | Wholesale & retail | 2023 |
| Hayden Hewett Properties 2016 Limited | Real estate | 2016 |
| Hayes Property Ventures Limited | Real estate | 2018 |