| Health and Beauty Care Limited | Health & social care | 2018 |
| Health and Housing Limited | Real estate | 2025 |
| Health Trac Limited | Health & social care | 2022 |
| Health-Minders Recuritment Limited | Health & social care | 2025 |
| Healthandwealth Group Limited | Health & social care | 2022 |
| Healthcare Today Media Limited | Information & communication | 2008 |
| Healthex Limited | Health & social care | 1987 |
| Healthy Hair Studio Ltd | Wholesale & retail | 2020 |
| Heat and Energy Solution Ltd | Professional & scientific | 2023 |
| Heat Box Pizza Limited | Hospitality | 2025 |
| Heat-Renew Limited | Construction | 2024 |
| Heatbox Pizza (Ashford) Ltd | Hospitality | 2024 |
| Heatcare (SE) Ltd | Construction | 2025 |
| Heath Homes Ltd | Construction | 2023 |
| Heathbury Homes (Redwall Lane) Limited | Construction | 2025 |
| Heathbury Homes Limited | Construction | 2025 |
| Heathcote Holdings Limited | Financial services | 2021 |
| Heathfield Osteopaths Limited | Health & social care | 2009 |
| Heathrow Electrical Ltd | Construction | 2014 |
| Heathrow Executive Ltd | Transport & logistics | 2016 |
| Heathrow Fencing Limited | Wholesale & retail | 2012 |
| Heathrow Hire Services Ltd | Administrative & support | 2021 |
| Heathrow Investments Ltd | Professional & scientific | 2012 |
| Heathrow Metal Recycling Ltd | Water & waste | 2023 |
| Heathrow Powerflow Exhaust Ltd | Wholesale & retail | 2025 |
| Heathrow Property Maintenance Ltd | Real estate | 2025 |
| Heathrow Roofing Sheets Ltd | Construction | 2025 |
| Heathrow Security Fencing Ltd | Wholesale & retail | 2025 |
| Heathrow Sheds Ltd | Wholesale & retail | 2025 |
| Heating and Renewable Engineers Ltd | Construction | 2019 |
| Heatsource Mechanical Engineers Ltd | Construction | 2024 |
| Heavens Touch Ltd | Other services | 2015 |
| Hebb Consultancy Ltd | Professional & scientific | 2025 |
| Hedd Technical Services Ltd | Professional & scientific | 2019 |
| Heimdall Holdings Ltd | Financial services | 2026 |
| Hein Krug Design Ltd | Information & communication | 2025 |
| Helen Beedham Consulting Ltd | Professional & scientific | 2020 |
| Helen Masters Dog Training Ltd | Other services | 2018 |
| Helen Masters Limited | Wholesale & retail | 2023 |
| Helen Mcginn Associates Ltd | Arts & recreation | 2023 |
| Helix Consulting Services Limited | Professional & scientific | 2022 |
| Helix Garden and Grounds Maintenance Limited | Other services | 2023 |
| HELL4LEATHER Cricket Ltd | Manufacturing | 2008 |
| Hellier Services LLP | | 2024 |
| Helmclad Ltd | Professional & scientific | 2024 |
| Heloz Ltd | Construction | 2021 |
| Help IS at Hand Limited | Administrative & support | 2019 |
| Hemel Consulting Limited | Extraterritorial | 2003 |
| Hemingway Carpentry Ltd | Construction | 2019 |
| Hemlon Developments Ltd | Construction | 2002 |
| Hemsley Consulting Limited | Professional & scientific | 2003 |
| Henderson’S Lettings & Management Ltd | Real estate | 2024 |
| Heneghan Family Law Ltd | Professional & scientific | 2021 |
| Hengrove Food & Wine Ltd | Wholesale & retail | 2020 |
| Henkelman UK Ltd | Wholesale & retail | 2012 |
| Henley & Regan Limited | Construction | 2014 |
| Henry Clifford Ltd | Construction | 2024 |
| Henry Green Plumbing & Heating Solutions Ltd | Construction | 2018 |
| Henton Homes Limited | Real estate | 2020 |
| Henwood Catering Limited | Hospitality | 2024 |
| Henwood Eighteen Limited | Extraterritorial | 2014 |
| Henwood Forty Four Limited | Real estate | 2022 |
| Henwood Forty Nine Limited | Professional & scientific | 2024 |
| Henwood Forty Seven Limited | Other services | 1995 |
| Henwood Forty SIX Limited | Construction | 2021 |
| Henwood House Limited | Real estate | 2016 |
| Henwood One Limited | Construction | 2010 |
| Henwood Seventeen Limited | Professional & scientific | 2014 |
| Henwood Thirty Three Limited | Financial services | 2018 |
| Henwood Thirty Two Limited | Health & social care | 2018 |
| Henwood Twenty Three Limited | Wholesale & retail | 2015 |
| Herbal Concepts Limited | Manufacturing | 1998 |
| Herbal Snap Limited | Wholesale & retail | 2018 |
| Herbalicious Ltd | Real estate | 2021 |
| Herd Media Limited | Professional & scientific | 2002 |
| Here Comes the Rebellion Ltd | Professional & scientific | 2018 |
| Heritage Building Developments Ltd | Construction | 2024 |
| Heritage Property Contractors Limited | Construction | 2024 |
| Heritage Technical Ltd | Professional & scientific | 2022 |
| Hermitage Court Edgell Road Staines Upon Thames 2016 Limited | Households | 2016 |
| Hero Film and Television Productions Limited | Arts & recreation | 2008 |
| Hero Goalie Co Ltd | Arts & recreation | 2021 |
| Hero Mechanical Services Ltd | Construction | 2020 |
| Herouvim Limited | Transport & logistics | 2024 |
| Herschell Props Limited | Information & communication | 2016 |
| Heskyn Ltd | Professional & scientific | 2023 |
| Hesse Macken Studio Limited | Professional & scientific | 2016 |
| Heston Cars London Limited | Wholesale & retail | 2018 |
| Hestwey Roofing Ltd | Construction | 2004 |
| HEW Engineering Services Ltd | Construction | 2023 |
| Hextel Communications UK Limited | Information & communication | 2014 |
| HF Compta Ltd | Professional & scientific | 2025 |
| HF004 Limited | Professional & scientific | 2010 |
| HFC Prestige Manufacturing UK Limited | Administrative & support | 2015 |
| HH Events Ltd | Extraterritorial | 2021 |
| HHE Contracting Limited | Professional & scientific | 2012 |
| HI Nail Limited | Other services | 2025 |
| Hi-Clean Domestic Window Cleaning Ltd | Administrative & support | 2024 |
| Hi-Clean South East Ltd | Administrative & support | 2018 |
| Hi-Flight Aerospace Ltd | Manufacturing | 1998 |