| HH (Bromham) Limited | Construction | 2020 |
| HH (Campton) Limited | Construction | 2022 |
| HH (Castlethorpe) Limited | Construction | 2023 |
| HH (Cleeve Prior) Limited | Construction | 2023 |
| HH (Clifton 2) Limited | Construction | 2021 |
| HH (Clifton) Limited | Construction | 2019 |
| HH (Clophill) Limited | Construction | 2019 |
| HH (CLOPHILL2) Limited | Construction | 2020 |
| HH (Codicote) Limited | Construction | 2021 |
| HH (Drakes Broughton) Limited | Construction | 2022 |
| HH (Eastern Villages) Limited | Construction | 2021 |
| HH (Eaton Bray) Limited | Construction | 2023 |
| HH (Fairfield) Limited | Construction | 2023 |
| HH (Finmere) Limited | Construction | 2021 |
| HH (Gotherington) Limited | Construction | 2022 |
| HH (Great Gransden) Limited | Construction | 2019 |
| HH (Hallow 3) Limited | Construction | 2020 |
| HH (Hanslope 2) Limited | Construction | 2023 |
| HH (Hanslope) Limited | Construction | 2020 |
| HH (Knowle) Limited | Construction | 2021 |
| HH (Lemsford) Limited | Construction | 2023 |
| HH (Little Harrowden) Ltd | Construction | 2022 |
| HH (Little Kimble) Limited | Construction | 2021 |
| HH (Martley) Limited | Construction | 2022 |
| HH (Maulden) Limited | Construction | 2024 |
| HH (Milton Malsor) Limited | Construction | 2023 |
| HH (Moggerhanger) Limited | Construction | 2019 |
| HH (Orwell) Ltd | Construction | 2022 |
| HH (Over) Limited | Real estate | 2021 |
| HH (Parkway) Limited | Construction | 2021 |
| HH (Prestbury) Limited | Construction | 2023 |
| HH (Stoke Mandeville) Limited | Construction | 2020 |
| HH (Toddington) Limited | Construction | 2022 |
| HH (Twyning) Limited | Construction | 2022 |
| HH (Upper Caldecote) Limited | Construction | 2020 |
| HH (Upper Quinton) Limited | Construction | 2019 |
| HH (West Lavington) Limited | Construction | 2021 |
| HH (Willington) Limited | Construction | 2019 |
| HH (Woburn Two) Limited | Construction | 2020 |
| HH (Woburn) Limited | Construction | 2019 |
| HH (Wokingham) Limited | Construction | 2021 |
| HH (Worminghall) Ltd | Construction | 2023 |
| HH Care Consultancy Ltd | Professional & scientific | 2020 |
| HH Development Group Limited | Construction | 2019 |
| HH Facilities 2 Limited | Construction | 2024 |
| HH Facilities Limited | Construction | 2019 |
| Hi-Bri's Ltd | Arts & recreation | 2025 |
| Hidden History Travel Limited | Administrative & support | 2025 |
| Hideaway Collective Co. Limited | Hospitality | 2025 |
| Hideoutuk Ltd | Hospitality | 2026 |
| High Brick Developments Limited | Construction | 2014 |
| High Street (Ryton) Limited | Construction | 2022 |
| High Street Epping Management Company Limited | Real estate | 2013 |
| High Street Location Limited | Real estate | 2010 |
| High View Investment Holdings Limited | Financial services | 2023 |
| Higher Healing Ltd | Health & social care | 2016 |
| Higherself the Movement C.I.C. | Health & social care | 2023 |
| Highgate Developers (Birmingham) Limited | Real estate | 2018 |
| Highgate United Football Club (Birmingham) Limited | Arts & recreation | 1963 |
| Highgate United Foundation Limited | Arts & recreation | 2026 |
| Highlands Court Management Limited | Real estate | 1988 |
| Highlands Gym Limited | Arts & recreation | 2019 |
| Hiho Talent Solutions Ltd | Administrative & support | 2025 |
| HIKE2HEAL Recovery C.I.C. | Health & social care | 2025 |
| Hilat Limited | Real estate | 1986 |
| Hiles Consulting Limited | Professional & scientific | 2014 |
| Hiley's Coffee Shop Limited | Hospitality | 2017 |
| Hill & Smith (Americas) 2 Limited | Professional & scientific | 2017 |
| Hill & Smith (Americas) 3 Limited | Professional & scientific | 2019 |
| Hill & Smith (Americas) Limited | Professional & scientific | 2010 |
| Hill & Smith (International) Limited | Professional & scientific | 2018 |
| Hill & Smith (Treasury) Limited | Financial services | 2009 |
| Hill & Smith (USA) Limited | Professional & scientific | 2009 |
| Hill & Smith (VSG) Limited | Manufacturing | 2004 |
| Hill & Smith Galvanized Products Limited | Professional & scientific | 2009 |
| Hill & Smith Group Limited | Manufacturing | 1964 |
| Hill & Smith Infrastructure Limited | Manufacturing | 1976 |
| Hill & Smith Infrastructure Products Group Limited | Professional & scientific | 1984 |
| Hill & Smith Overseas Limited | Professional & scientific | 2008 |
| Hill & Smith Pension Trustees Limited | Extraterritorial | 2015 |
| Hill & Smith PLC | Professional & scientific | 1960 |
| Hill & Smith Tipi Newco Limited | Professional & scientific | 2025 |
| Hill END Road (Twyning) Limited | Construction | 2020 |
| Hill Start School of Motoring Limited | Education | 2022 |
| Hillcrest Cars Ltd | Wholesale & retail | 2026 |
| Hillcrest Landscapes Limited | Administrative & support | 2018 |
| Hillfield Construction Management Ltd | Construction | 2012 |
| Hillfield Consultants Limited | Education | 2023 |
| Hillfield Farm Management Company Limited | Real estate | 2003 |
| Hillfield Hall Management Company Limited | Real estate | 2003 |
| Hillfield Kitchens Ltd | Construction | 2023 |
| Hilliard Invest Limited | Construction | 2024 |
| Hills Energy Management Solutions Ltd | Information & communication | 2014 |
| Hills Home Improvements Limited | Construction | 2024 |
| Hillside Views (Napton) Management Company Limited | Households | 2018 |
| Hillthorpe Property Limited | Real estate | 2023 |
| Hillwood Estates Limited | Real estate | 2018 |
| Hiltec Ltd | Other services | 2014 |
| Hinaa Ltd | Health & social care | 2024 |
| Hinckley Park Estate Management Company Limited | Real estate | 2020 |