| Hawks London Ltd | Wholesale & retail | 2024 |
| Hawksbill Business Development Ltd | Administrative & support | 2017 |
| Hawthorn Residents Association Limited | Administrative & support | 1990 |
| Hawwa Properties Limited | Real estate | 2023 |
| HAY Wain Carpentry Limited | Manufacturing | 2025 |
| Haydron Ltd | Wholesale & retail | 2026 |
| Hayes GIN Distribution Limited | Wholesale & retail | 2021 |
| Hayjade Catering Ltd | Hospitality | 2026 |
| Hayleyellenjames Ltd | Extraterritorial | 2024 |
| Haylin Associates Ltd | Administrative & support | 2018 |
| Haywood Design Communications Limited | Professional & scientific | 2004 |
| HAZ Productions Ltd | Other services | 2023 |
| Hazlemere Climate Group CIC | Water & waste | 2024 |
| Hazlemere Commercial Limited | Construction | 2026 |
| Hazlemere Estates Limited | Professional & scientific | 1988 |
| Hazlemere Fine Foods Ltd | Extraterritorial | 2022 |
| Hazlemere Fire Protection Limited | Professional & scientific | 2011 |
| Hazlemere Fish and Chips & Kebab Ltd | Hospitality | 2019 |
| Hazlemere Heating Limited | Construction | 2003 |
| Hazlemere Holdings Limited | Financial services | 2003 |
| Hazlemere Management Services LLP | | 2012 |
| Hazlemere Social Work Ltd | Health & social care | 2022 |
| Hazlemere Upholstery Limited | Manufacturing | 1975 |
| Hazlemere Window Company Limited | Construction | 1987 |
| Hazrem Environmental Ltd | Water & waste | 2004 |
| Hbbi Ltd | Professional & scientific | 2025 |
| HCS Furniture Ltd | Other services | 2020 |
| HD Complete Solutions Ltd | Construction | 2012 |
| Hdk(Uk) Limited | Construction | 2013 |
| HDL Homes Ltd | Construction | 2023 |
| HDM Property Group Limited | Real estate | 2026 |
| HE With US Company Limited | Hospitality | 2020 |
| Headstuff Adhd Therapy Ltd | Health & social care | 2012 |
| Healingmindswithjoanne Ltd | Health & social care | 2021 |
| Health by Harry Ltd | Other services | 2024 |
| Healthcare Commitment Limited | Health & social care | 2022 |
| Healthwatch Bucks Limited | Public administration | 2013 |
| Healthy Minds for Healthy Futures Ltd | Other services | 2019 |
| Hearne Holmes Developments Limited | Construction | 2002 |
| Hearne Holmes Holdings Limited | Financial services | 2017 |
| Hearne Holmes R14 LLP | | 2018 |
| Hearne Holmes Toddington Limited | Construction | 2009 |
| Hearneholmes Management Ltd | Real estate | 2016 |
| Heartstone Estates Ltd | Real estate | 2021 |
| Heat Industrial Limited | Administrative & support | 1996 |
| Heathborough Limited | Other services | 2021 |
| Heathrow Exclusive Limited | Transport & logistics | 2016 |
| Heating Grants Ltd | Construction | 2025 |
| Heavendeals Ltd | Wholesale & retail | 2026 |
| Heavenly Arms Ltd | Manufacturing | 2019 |
| Heavenly Housing Ltd | Real estate | 2022 |
| Heavens Property Ltd | Real estate | 2022 |
| Heavey RF UK Ltd | Information & communication | 2004 |
| Hebri Stores Ltd | Wholesale & retail | 2021 |
| Hecate’Sdesigns Limited | Wholesale & retail | 2023 |
| Heddi Car Sales Limited | Wholesale & retail | 2024 |
| Hedley Communications Ltd | Professional & scientific | 2022 |
| Hedsor Brae Management Company Limited | Real estate | 2012 |
| Hedsor Golf Course Limited | Arts & recreation | 2000 |
| Heidi Q LLP | | 2011 |
| Heidrun Ltd | Hospitality | 2015 |
| Hekano Ltd | Real estate | 2024 |
| Hekt Limited | Administrative & support | 2025 |
| Hela Investments Ltd | Financial services | 2018 |
| Heldean Limited | Wholesale & retail | 1984 |
| Helen Anne Norbury Ltd | Other services | 2021 |
| Helicoptair Limited | Manufacturing | 2024 |
| Helicopter & Pilot Services Ltd | Transport & logistics | 2009 |
| Hellfire Bikes Limited | Information & communication | 2021 |
| Hellfire E Liquid Limited | Wholesale & retail | 2018 |
| Hellfire Enterprises Ltd | Hospitality | 2023 |
| Hello Boss Ltd | Hospitality | 2025 |
| Hello Hackenbacker Marketing Ltd | Professional & scientific | 2024 |
| Hello I AM Paul Ltd | Professional & scientific | 2018 |
| Hellocomply Limited | Professional & scientific | 2025 |
| Helloyasser Ltd | Information & communication | 2021 |
| HELP2YOU Ltd | Professional & scientific | 2022 |
| Helping Patients Limited | Hospitality | 2016 |
| Helsby Management Company Limited | Households | 2008 |
| Henley Contractors Ltd | Administrative & support | 2021 |
| Henley Housekeepers Limited | Administrative & support | 2026 |
| Henley Mouldings Limited | Real estate | 1992 |
| Henley Riverside Properties Limited | Real estate | 2017 |
| Hensel Electric UK Ltd | Manufacturing | 2018 |
| Heppy Clothing Ltd | Wholesale & retail | 2026 |
| Hera Motors Limited | Administrative & support | 2019 |
| Herbal Buti Limited | Real estate | 2025 |
| Herbert & Partners (Architecture) Ltd. | Professional & scientific | 1998 |
| Herdwick & Goose Limited | Professional & scientific | 2018 |
| Heritage Design Employment Ltd | Administrative & support | 2024 |
| Heritage Harvest Limited | Agriculture & fishing | 2006 |
| Heritage London Design and Build Ltd | Construction | 2021 |
| Heritage Masonry Limited | Construction | 2023 |
| Heritage Park Gravesend Residents Association (NO. 1) Limited | Extraterritorial | 2003 |
| Heritage Park Gravesend Residents Association (NO. 2) Limited | Extraterritorial | 2003 |
| Heritage Park Gravesend Residents Association (NO.3) Limited | Extraterritorial | 2003 |
| Heritage Park Gravesend Residents Association (NO.4) Limited | Extraterritorial | 2003 |
| Heritage Park Gravesend Residents Association (NO.5) Limited | Extraterritorial | 2003 |
| Heritage Personnel Services Limited | Administrative & support | 2016 |
| Heritage Tree Services Limited | Agriculture & fishing | 1989 |