| HI JV Ltd | Real estate | 2024 |
| HI Medical Services Ltd | Health & social care | 2017 |
| HI Property NO 1 Ltd | Real estate | 2026 |
| HI Property NO 2 Ltd | Real estate | 2026 |
| HI Property NO 3 Ltd | Real estate | 2026 |
| HI Props Ltd | Real estate | 2023 |
| HI Q Windows Limited | Manufacturing | 2017 |
| HI Resources Limited | Financial services | 2008 |
| HI Spec Autos Ltd | Wholesale & retail | 2019 |
| HI Speed D.I.Y. Limited | Manufacturing | 1973 |
| HI Sweety 8 Ltd | Wholesale & retail | 2019 |
| HI Tech Investigations International Ltd | Administrative & support | 2025 |
| HI Tech Mobile Store Limited | Wholesale & retail | 2025 |
| HI Transportation Limited | Transport & logistics | 2020 |
| HI Vapor Ltd | Wholesale & retail | 2025 |
| Hi-Box Limited | Manufacturing | 1990 |
| Hi-Diver Limited | Manufacturing | 1991 |
| Hi-Jet Motor Ltd | Wholesale & retail | 2023 |
| Hi-Kraft Building Services Ltd | Construction | 2026 |
| Hi-Q Services Ltd | Other services | 2023 |
| Hi-Tech Connections Ltd | Energy | 2023 |
| Hi-Tech Midlands Glazing Limited | Construction | 2018 |
| Hi-Tech Painting & Decorating Ltd | Construction | 2015 |
| Hi-Trux Limited | | 1989 |
| Hiace H.S Ltd | Other services | 2018 |
| Hiarcut by FR Ltd | Other services | 2025 |
| Hiatico Ltd | Wholesale & retail | 2025 |
| Hiatt and Company Limited | Manufacturing | 2013 |
| Hiatt Handcuffs Limited | Manufacturing | 2013 |
| Hiatt Hardware (UK) Limited | Wholesale & retail | 2009 |
| Hiba Foundation | Hospitality | 2013 |
| Hibaysan CIC | Education | 2026 |
| Hibbah's Accountancy Services Ltd | Professional & scientific | 2023 |
| Hibbs Electrics Limited | Construction | 2014 |
| Hibernia Foods Bakeries Limited | Manufacturing | 1965 |
| Hibernia Foods Limited | Manufacturing | 1984 |
| Hibo Outlet Limited | Wholesale & retail | 2021 |
| Hibretone Community Interest Company | Information & communication | 2022 |
| Hichapp Limited | Information & communication | 2017 |
| Hickley Limited | Professional & scientific | 2006 |
| Hickman Bros Ltd | Real estate | 2021 |
| Hickman Housing Limited | Real estate | 2025 |
| Hickory's Doggy Delights Limited | Wholesale & retail | 2022 |
| Hickston Properties Ltd | Real estate | 2025 |
| Hidaya Vape Wholesale Ltd | Wholesale & retail | 2025 |
| Hidayah Developments Ltd | Real estate | 2026 |
| Hidayah Motor Trade Ltd | Wholesale & retail | 2025 |
| Hidden Glow Ltd | Other services | 2024 |
| Hidden Steeze Limited | Wholesale & retail | 2024 |
| Hidden Talent Clothing Ltd | Wholesale & retail | 2022 |
| Hidden Talent Collective Ltd | Arts & recreation | 2018 |
| Hideaway Day Nursery Limited | Education | 2000 |
| Hideca Ltd | Extraterritorial | 2025 |
| Hidiginvest Ltd | Administrative & support | 2024 |
| Hidmah Ltd | Health & social care | 2025 |
| Hidmona Restaurant Ltd | Hospitality | 2024 |
| Hidr Media Limited | Information & communication | 2016 |
| HIE Housing Limited | Real estate | 2025 |
| HIE Property Group Limited | Real estate | 2024 |
| Hieu ANH Limited | Wholesale & retail | 2023 |
| Hieu VO Ltd | Other services | 2025 |
| Hieza Limited | Wholesale & retail | 2025 |
| Hifacon Ltd | Wholesale & retail | 2021 |
| Hifar Swift Ltd | Transport & logistics | 2025 |
| Hifcart Limited | Wholesale & retail | 2023 |
| Hifu Limited | Health & social care | 2023 |
| Higate Midlands Limited | Manufacturing | 2017 |
| Higates Limited | Financial services | 2012 |
| Higbson Ltd | Construction | 2025 |
| Higgins (Plant Hire) Limited | Transport & logistics | 1966 |
| Higgins Property Holdings Ltd | Real estate | 2026 |
| High & DRY Roofing Ltd | Construction | 2025 |
| High Achievers Community Interest Company | Education | 2009 |
| High Achievers Services Limited | Education | 2016 |
| High Alert Security Limited | Financial services | 2020 |
| High Class Care Ltd | Public administration | 2021 |
| High Class Limited | Manufacturing | 2019 |
| High Class Pawn Brokers Ltd | Financial services | 2013 |
| High Close Farm Developments Ltd | Construction | 2020 |
| High Court Enforcement (HMO) Limited | Professional & scientific | 2006 |
| High Crown Housing Ltd | Real estate | 2025 |
| High Definition Aesthetics B'Ham Ltd | Health & social care | 2018 |
| High Definition Aesthetics London Ltd | Health & social care | 2018 |
| High Definition Aesthetics Ltd | Health & social care | 2018 |
| High Definition Lipo Limited | Other services | 2018 |
| High Definition Mgmt Ltd | Health & social care | 2018 |
| High END Jewellery Ltd | Wholesale & retail | 2024 |
| High Eyton 2 Ltd | Real estate | 2021 |
| High Eyton Ltd | Real estate | 2016 |
| High Fifteen Limited | Other services | 2019 |
| High Five Housing Limited | Real estate | 2025 |
| High Frequensea Moss Ltd | Manufacturing | 2025 |
| High House Drive B45 Limited | Real estate | 2022 |
| High House Property Investments Ltd | Real estate | 2019 |
| High House View Limited | Hospitality | 2026 |
| High Kinz Limited | Real estate | 2013 |
| High Level Innovations Ltd | Wholesale & retail | 2023 |
| High Living Estates Education Ltd | Education | 2023 |
| High Living Estates Ltd | Real estate | 2022 |
| High Lodge Management Company Limited | Households | 2010 |