| Health Natural Innovations Limited | Professional & scientific | 2019 |
| Health Natural Limited | Health & social care | 1997 |
| Healthvive Limited | Professional & scientific | 2016 |
| Healthwise Enterprises Ltd | Health & social care | 2023 |
| Healthy Lives Limited | Real estate | 1996 |
| Hearts Heads Limited | Administrative & support | 2011 |
| Heartsmart Ltd | Health & social care | 2025 |
| Heartsmith Property Services Ltd | Construction | 2025 |
| Heathtrade Limited | Hospitality | 1995 |
| Heating & Plumbing UK Limited | Construction | 2004 |
| Heaven Publicity Ltd | Professional & scientific | 2011 |
| Heavy Spectrum Limited | Information & communication | 2011 |
| Heber Developments Limited | Construction | 2024 |
| Hebisa Properties Limited | Real estate | 2024 |
| Heed Studio Ltd | Professional & scientific | 2016 |
| Heetee Baby Company Ltd | Manufacturing | 2013 |
| Helen Evans Ltd | Administrative & support | 2017 |
| Helen T. Ltd | Administrative & support | 2023 |
| Helix Financial Partners Limited | Financial services | 2023 |
| Helix PAY Ltd | Information & communication | 2020 |
| Helix Structured Finance Limited | Financial services | 2021 |
| Hello 2MORROW Limited | Professional & scientific | 2016 |
| Hello Maiko Ltd | Information & communication | 2024 |
| Helmar Holdings Limited | Information & communication | 2025 |
| Hemmings Developments Limited | Real estate | 2001 |
| Henley Rose Ltd | Administrative & support | 2019 |
| Herbal Essence Health Center Ltd | Health & social care | 2024 |
| Herdal Systems Limited | Professional & scientific | 2004 |
| Heritage in Motion Ltd | Wholesale & retail | 2025 |
| Heritage Outfitters Ltd | Wholesale & retail | 2025 |
| Herne Bay CT6 Ltd | Real estate | 2015 |
| Heron Court Consultants Limited | Professional & scientific | 2013 |
| Herons Reach Residents Association (Isleworth) Limited | Households | 1987 |
| Hersey Project Management Services Ltd. | Professional & scientific | 2016 |
| Hersham Land PLC. | Construction | 1999 |
| HES Contracts Ltd | Administrative & support | 2025 |
| Hettrick People Consulting Limited | Professional & scientific | 2022 |
| Heverfield Court (Management) Company Limited | Households | 1986 |
| Hewitt Landscapes Limited | Administrative & support | 2004 |
| Hewitt Spiritual Limited | Information & communication | 2024 |
| HG Ellis Holding LP | | 2020 |
| HH Street Hotel Ltd | Hospitality | 2019 |
| Hi-Tech Realty UK Ltd | Construction | 2024 |
| Hibiscus House Hotel UK Ltd | Hospitality | 2018 |
| Hickorygate Ltd | Real estate | 2025 |
| Hierbarcilla Ltd | Professional & scientific | 2017 |
| High Coombe Residents Association (Kingston) Limited | Households | 1988 |
| High Street West Sunderland Ltd | Real estate | 2019 |
| Highgrove Limited | Professional & scientific | 1976 |
| Hightrees Property RTM Company Limited | Households | 2004 |
| Higoing International Express Ltd | Transport & logistics | 2016 |
| Hikmah Circle Consulting UK Limited | Information & communication | 2025 |
| Hill Land and Developments Ltd | Administrative & support | 2013 |
| Hillside Management Company (Caterham) Ltd | Households | 2021 |
| Hiltron Limited | Professional & scientific | 1983 |
| Himal Estates Ltd | Real estate | 2023 |
| Hinton Creative Limited | Professional & scientific | 2021 |
| Hips and Pics Limited | Administrative & support | 2010 |
| Hireservices (EUR) Limited | Administrative & support | 2008 |
| Hireservices (U.K.) Limited | Water & waste | 2003 |
| Hitchcock & Co. (Glass Merchants) Limited | Real estate | 1976 |
| Hitdynamic Ltd | Information & communication | 2020 |
| Hitomi International Limited | Information & communication | 2020 |
| HJ Global Limited | Wholesale & retail | 2020 |
| HK108 Limited | Real estate | 2016 |
| Hkuk Limited | Other services | 2024 |
| HL Professional Services Ltd | Professional & scientific | 2012 |
| Hmrp Limited | Information & communication | 2023 |
| HN Marketing Limited | Professional & scientific | 1999 |
| HOA Nails Studio Ltd | Other services | 2026 |
| Hochman Limited | Professional & scientific | 2018 |
| Hogsmill Ltd | Information & communication | 2024 |
| Hohoho Event Ltd | Wholesale & retail | 2019 |
| Holdfast Engineering Limited | Manufacturing | 2010 |
| Holdfive Limited | Administrative & support | 2006 |
| Holidays 4U Limited | Real estate | 2023 |
| Hollands Ventures Ltd | Professional & scientific | 2024 |
| Holmwood Court (New Malden) Residents Company Limited | Households | 1995 |
| Home Intel Ltd | Construction | 2025 |
| Home of Children Limited | Health & social care | 2025 |
| Home Renovations UK Limited | Construction | 2007 |
| Home Touch Ltd | Construction | 2025 |
| Homefield Park (Freehold) Limited | Households | 2003 |
| Homefield Park Management Company (1985) Limited | Households | 1985 |
| Homesteer Ltd | Information & communication | 2023 |
| Homewood Design & Build Kent Limited | Construction | 2016 |
| Homington Court Limited | Households | 1998 |
| Hone Talent Ltd | Administrative & support | 2026 |
| Honeycomb Financial LLP | | 2023 |
| Honeypunch Ltd | Extraterritorial | 2006 |
| Hong Estates LLP | | 2014 |
| Hongyu Group Co., Ltd. | Extraterritorial | 2015 |
| Honky Design Limited | Professional & scientific | 2003 |
| Hook UPS and Downs Limited | Information & communication | 2020 |
| Horizon High Value Ltd | Professional & scientific | 2025 |
| Horizon Lifestyle Limited | Real estate | 2026 |
| Horizon Mining UK Limited | Financial services | 2026 |
| Horizonnine Ltd | Professional & scientific | 2025 |
| Horrocks & Boyd Limited | Health & social care | 2012 |
| Horsfall Associates Ltd | Education | 2012 |