| Heath Farm Limited | Administrative & support | 1991 |
| Heather Field School Ltd | Education | 2018 |
| Heathview Management Company Limited | Health & social care | 1999 |
| Heatley Interiors Limited | Construction | 2026 |
| Heaton Consolidated Property Holdings Limited | Professional & scientific | 1997 |
| Heaton Holdings Limited | Professional & scientific | 1981 |
| Heaton Park Specsavers Limited | Wholesale & retail | 2019 |
| Heaton Property Investments Limited | Real estate | 1987 |
| Hedge END Specsavers Limited | Wholesale & retail | 2018 |
| Hedley’S Homes Ltd | Real estate | 2025 |
| Helensburgh Specsavers Limited | Wholesale & retail | 2019 |
| Helio Energy Limited | Construction | 2025 |
| Hello Darling Productions Ltd | Arts & recreation | 2026 |
| Help Accountancy Limited | Administrative & support | 2013 |
| Help Bookkeeping and Accountancy Limited | Administrative & support | 2013 |
| Help Bookkeeping Limited | Administrative & support | 2013 |
| Help CIS Limited | Administrative & support | 2013 |
| Help Taxation Limited | Administrative & support | 2013 |
| Helpbox Franchise Limited | Administrative & support | 2012 |
| Helpful Removals Ltd | Water & waste | 2024 |
| Helston Specsavers Limited | Wholesale & retail | 2016 |
| Helyers Design Services Ltd | Professional & scientific | 2021 |
| Helyers Landscaping Limited | Administrative & support | 2018 |
| Helyers Maintenance Services Limited | Construction | 2014 |
| Helyers of Hampshire Limited | Financial services | 2021 |
| Helyers Planting Services Limited | Administrative & support | 2023 |
| Hemel Hempstead Specsavers Hearcare Limited | Wholesale & retail | 2018 |
| Hemel Hempstead Specsavers Limited | Wholesale & retail | 1995 |
| Hemel Hempstead Visionplus Limited | Wholesale & retail | 2000 |
| Hempstead Valley Specsavers Limited | Wholesale & retail | 2018 |
| Hendon Specsavers Limited | Wholesale & retail | 2024 |
| Henri Estates Limited | Real estate | 2026 |
| Henry Frank Corporation Ltd | Real estate | 2024 |
| Hepple Building Services Limited | Construction | 2013 |
| Herd Group Global Ltd | Information & communication | 2022 |
| Hereford Specsavers Hearcare Limited | Wholesale & retail | 2006 |
| Hereford Specsavers Limited | Wholesale & retail | 1986 |
| Hereford Visionplus Limited | Wholesale & retail | 2002 |
| Heritage (UK) Services Limited | Construction | 2005 |
| Heritage Garden Canvas Ltd | Manufacturing | 2019 |
| Heritage Garden Upholstery Ltd | Manufacturing | 2019 |
| Hermitage Country Homes Ltd | Construction | 2024 |
| Herne Bay Specsavers Limited | Wholesale & retail | 2018 |
| Heron's Landing Management Company Ltd | Households | 2011 |
| Herr Kutz Limited | Other services | 2003 |
| Hertford Specsavers Hearcare Limited | Wholesale & retail | 2026 |
| Hertford Specsavers Limited | Wholesale & retail | 2002 |
| Hertfordshire Domiciliary Specsavers Limited | Wholesale & retail | 2014 |
| Hertfordshire Newmedica Limited | Health & social care | 2024 |
| Hervines Group Limited | Professional & scientific | 2015 |
| Hestia Counselling Ltd | Other services | 2020 |
| Heswall Specsavers Limited | Wholesale & retail | 2017 |
| HEX Properties Ltd | Real estate | 2020 |
| Hexham Specsavers Limited | Wholesale & retail | 1995 |
| Hexham Visionplus Limited | Wholesale & retail | 1995 |
| HEY Clean Ltd | Administrative & support | 2022 |
| HEY Clear Ltd | Water & waste | 2022 |
| HEY Friend Ltd. | Wholesale & retail | 2016 |
| HEY Storage Ltd | Transport & logistics | 2022 |
| Heyday International Supply Chain Management UK Ltd | Transport & logistics | 2022 |
| Heyford Hill Specsavers Limited | Wholesale & retail | 2018 |
| Heyman Consulting & Advisory UK Limited | Professional & scientific | 2025 |
| HGP Architects Limited | Professional & scientific | 1986 |
| HGP Holdings (2016) Limited | Financial services | 2016 |
| HGW Carpentry Limited | Construction | 2008 |
| HH Surveying Ltd | Professional & scientific | 2026 |
| HI - Tech (UK) Holdings Limited | Financial services | 2021 |
| HI Leisure Limited | Extraterritorial | 2007 |
| Hi-Pol Metal Finishers Limited | Manufacturing | 2003 |
| Hi-Spec Corporation Limited | Administrative & support | 1995 |
| Hi-Tail Limited | Manufacturing | 2019 |
| Hi-Tech (UK) Limited | Other services | 2005 |
| Hi-Tech Precision Engineering (UK) Limited | Manufacturing | 1999 |
| Hi-Tech Property Services Ltd | Construction | 2003 |
| Hidden Fortress Tabletop Games Ltd | Wholesale & retail | 2026 |
| Hidden GEM Trading Cards Ltd | Wholesale & retail | 2024 |
| Hidden Trackers Ltd | Wholesale & retail | 2008 |
| Hiddentec Holdings Limited | Professional & scientific | 2008 |
| Hiddentec Ltd | Wholesale & retail | 2003 |
| Hiddentec R & D Limited | Professional & scientific | 2016 |
| Hide & Stitch Ltd | Wholesale & retail | 2017 |
| Hident Ltd | Wholesale & retail | 2018 |
| High Street Sweets Limited | Wholesale & retail | 2009 |
| High Wycombe Specsavers Hearcare Limited | Wholesale & retail | 2016 |
| Highcol Ltd | Construction | 2012 |
| Highfield Construction Southern Ltd | Construction | 2012 |
| Highgrove Recruitment Group Limited | Administrative & support | 2017 |
| Highlands Road Fish and Chips Limited | Hospitality | 2026 |
| Highlight House (Eastbourne) Limited | Real estate | 2008 |
| Highlight House Limited | Real estate | 1982 |
| Highport& Go Limited | Information & communication | 2025 |
| Highwater Capital Ltd | Real estate | 2024 |
| HIJ Leisure Limited | Arts & recreation | 2003 |
| Hilborn Martin Associates Limited | Administrative & support | 2015 |
| Hill Head Building & Roofing Ltd | Construction | 2026 |
| Hill Head Electrical Services Ltd | Construction | 2017 |
| Hillcrest Machinery & Engineering (Portchester) Limited | Manufacturing | 1970 |
| Hillcrest Structural Holdings Limited | Professional & scientific | 2009 |
| Hillcrest Structural Limited | Construction | 1982 |
| Hillman Saunders Limited | Administrative & support | 2010 |