| Health Care Recruiters Limited | Health & social care | 1999 |
| Health Connections PTS Limited | Health & social care | 2016 |
| Health Matters Online INT Ltd | Health & social care | 2024 |
| Health Store Online Ltd | Wholesale & retail | 2015 |
| Health, Happiness & Healing Ltd | Health & social care | 2025 |
| Healthcare (Barts) Limited | Professional & scientific | 2005 |
| Healthcare 2000 (N.I.) Limited | Health & social care | 1990 |
| Healthcare Innovation Consultancy Ltd | Professional & scientific | 2022 |
| Healthcare Solutions (Hull) Holdings Limited | Professional & scientific | 2005 |
| Healthcare Solutions (Hull) Limited | Administrative & support | 2005 |
| Healthcare Support and Infrastructure Services LLP | | 2018 |
| Healthhub Direct Limited | Wholesale & retail | 2025 |
| Healthimpact Ltd | Health & social care | 2021 |
| Healthsource (Bromley) Holdings Limited | Financial services | 2001 |
| Healthsource (Bromley) Limited | Health & social care | 2001 |
| Healthy Estates Facilities Management Ltd | Administrative & support | 2019 |
| Healthy Foods PVT Ltd | Hospitality | 2019 |
| Healthy Heads Education Ltd | Hospitality | 2011 |
| Healthy Homes Cleaning Ltd | Administrative & support | 2017 |
| Healthy Leaders Limited | Health & social care | 2016 |
| Hearing Check (Holdings) Ltd | Financial services | 2021 |
| Heart of Lancashire Primary Care Ltd | Health & social care | 2026 |
| Heart of the Village Ltd | Health & social care | 2026 |
| Heartbeat Northwest Cardiac Care | Health & social care | 2016 |
| Hearthlyn Care Ltd | Health & social care | 2026 |
| Hearthub Group Ltd | Extraterritorial | 2018 |
| Heat Cheat Ltd | Wholesale & retail | 2024 |
| Heat Green Ltd | Construction | 2006 |
| HEAT4ORCE Ltd | Construction | 2010 |
| Heating & Cooling Installations Limited | Construction | 2013 |
| Heating Parts Center Ltd | Wholesale & retail | 2010 |
| Heating Pro Limited | Professional & scientific | 2013 |
| Heatonomy Ltd | Construction | 2024 |
| Heatons Prestige & Restoration Specialists T/A Heatons Limited | Wholesale & retail | 2023 |
| Heavenly Reality Ltd | Real estate | 2025 |
| Heavers of Bridport Limited | Manufacturing | 2003 |
| Heba Pilates Ltd | Arts & recreation | 2021 |
| Hebes Holdings Ltd | Real estate | 2019 |
| Hebron Locums Limited | Health & social care | 2010 |
| Hedera Goalkeeping Limited | Wholesale & retail | 2016 |
| Hedge Gardening & Van Services Ltd | Transport & logistics | 2025 |
| Hedley & Company Stockbrokers Limited | Financial services | 2007 |
| Hedra International Ltd | Professional & scientific | 2024 |
| Heeken House Limited | Financial services | 2018 |
| Heidi Hall Limited | Extraterritorial | 2006 |
| Heima Global Limited | Wholesale & retail | 2026 |
| Heimdell Tech AI Ltd | Information & communication | 2025 |
| Heir Salon and Education Ltd | Other services | 2020 |
| Heise Drainage Limited | Water & waste | 2019 |
| Heka Fit UK Ltd | Information & communication | 2023 |
| HEL B Ltd | Wholesale & retail | 2021 |
| HEL Investments Limited | Real estate | 2020 |
| Helen in Wonderlust Ltd | Administrative & support | 2016 |
| Helicam Services Ltd | Information & communication | 2017 |
| Helicon One Digital Ltd | Information & communication | 2020 |
| Heliolink Ltd | Wholesale & retail | 2011 |
| Helios Software Solutions Limited | Information & communication | 2013 |
| Helix 1436 Ltd | Construction | 2015 |
| Helixed Ltd | Professional & scientific | 2025 |
| Heller PH Services Limited | Construction | 2024 |
| Helm Builders Limited | Construction | 2010 |
| Helm DP Ltd | Other services | 2010 |
| Helmrig Holdings Limited | Financial services | 2021 |
| Help for YOU ( Royton ) Limited | Administrative & support | 2020 |
| Help for YOU UK Limited | Public administration | 2009 |
| Help ME Legal Limited | Other services | 2023 |
| Help to Live NW Ltd | Administrative & support | 2025 |
| Helping Hands 24/7 Ltd | Health & social care | 2016 |
| Helping Hands Personnel Ltd | Administrative & support | 2013 |
| Helping Young People Engage (Hype) Hub Ltd | Health & social care | 2025 |
| HEM Developments Ltd | Construction | 2025 |
| Hemf Consulting Ltd | Information & communication | 2017 |
| HEN House (Wholesale) Limited | Wholesale & retail | 1990 |
| HEN House Limited(The) | Wholesale & retail | 1984 |
| Hend Ltd | Health & social care | 2025 |
| Henderson News and Media Limited | Professional & scientific | 2014 |
| Henley Art Publishing Ltd | Wholesale & retail | 2021 |
| Henmead Limited | Financial services | 1978 |
| Hennel Lane Ltd | Real estate | 2024 |
| Henry Alty Limited | Wholesale & retail | 1909 |
| Henry Barron Tomlinson Limited | Arts & recreation | 2023 |
| Henry Ibbotson & SON Limited | Construction | 1951 |
| Henry Iddon & Sons Limited | Real estate | 1990 |
| Henry's Investment Properties Ltd | Real estate | 2022 |
| Henzo Ecom Ltd | Wholesale & retail | 2026 |
| Herbalhouse Ltd | Other services | 2016 |
| Herbique London Ltd | Other services | 2024 |
| Here for Culture & Place Ltd | Professional & scientific | 2023 |
| Heritage Coffee Co Ltd | Hospitality | 2023 |
| Heritage Court Investments Limited | Real estate | 2015 |
| Heritage Covers Limited | Professional & scientific | 1987 |
| Heritage Global Solutions Ltd | Wholesale & retail | 2012 |
| Heritage Interiors (Lancashire) Limited | Professional & scientific | 2014 |
| Heritage Restoration Ltd | Construction | 2016 |
| Heritage Revived Ltd | Wholesale & retail | 2025 |
| Heritage Skills Ltd | Education | 2026 |
| Hermana Creatives Limited | Professional & scientific | 2016 |
| Hermitage Healthcare Limited | Administrative & support | 2023 |
| Heron Roofing (NW) Ltd | Construction | 2026 |
| Herosservices Limited | Professional & scientific | 2019 |