| Gymstar Limited | Arts & recreation | 2013 |
| H G S Services Limited | Administrative & support | 1995 |
| H.B. Trustees Limited | Professional & scientific | 1984 |
| HA Medical Ltd | Health & social care | 2019 |
| Habito London Limited | Real estate | 2012 |
| Haddax Limited | Information & communication | 2020 |
| Haha Panda Limited | Hospitality | 2010 |
| Haigh Roberts Limited | Professional & scientific | 2010 |
| Halamar (GR) Limited | Administrative & support | 2018 |
| Halamar (Wellington Court) Limited | Real estate | 2014 |
| Halcom Ltd | Wholesale & retail | 2025 |
| Halfway House Property Limited | Real estate | 2009 |
| Hall Barn Sporting Club Limited | Arts & recreation | 2014 |
| Halldime Limited | Professional & scientific | 2002 |
| Hallmark Contractors Limited | Construction | 2020 |
| Hamalobo Limited | Administrative & support | 2018 |
| Hambledon Group Ltd | Financial services | 2002 |
| Hamilton House Homes Limited | Real estate | 2013 |
| Hampden Hill Trading Limited | Professional & scientific | 2024 |
| Hanabi Management Limited | Administrative & support | 2010 |
| Hanham Garage Ltd | Wholesale & retail | 2006 |
| Hanover 2020 Limited | Financial services | 2020 |
| Hanover Cube Consulting Ltd | Administrative & support | 2007 |
| Hanover Cube LLP | | 2004 |
| Hansine Ltd | Wholesale & retail | 2018 |
| HANWELLW7 Properties and Development Ltd | Real estate | 2020 |
| HAQ Capital Limited | Financial services | 2014 |
| Hara Medical Ltd | Health & social care | 2017 |
| Harbor Solutions Limited | Information & communication | 2012 |
| Hardvendel Design Ltd | Professional & scientific | 2014 |
| Harley Street Medical Clinic Ltd | Wholesale & retail | 2024 |
| Harman Badger Way Ltd | Real estate | 2020 |
| Harman Family Investments Limited | Financial services | 2017 |
| Harman Foley Ltd | Real estate | 2021 |
| Harman Hughenden Park Limited | Real estate | 2023 |
| Harman Property Developments Limited | Construction | 2017 |
| Harman WW Limited | Real estate | 2020 |
| Harpers Estate Limited | Real estate | 2010 |
| Harringtons Commercial Property Consultants Limited | Real estate | 1994 |
| Harris Hawkins Properties Ltd | Real estate | 2026 |
| Harrytohelp Ltd | Wholesale & retail | 2025 |
| Hartcran Investments Limited | Real estate | 1958 |
| Harwood Hutton (London) LLP | | 2016 |
| Hawthorns Penn MAN Co Ltd | Households | 2025 |
| Hayvin Group Limited | Information & communication | 2025 |
| Hazlemere Tax Consultancy Limited | Professional & scientific | 2008 |
| HBM Global Group Limited | Professional & scientific | 2016 |
| HC Auctions Ltd | Real estate | 2025 |
| HCP Staffing Services Limited | Administrative & support | 2011 |
| HDE Construction Ltd | Construction | 2026 |
| Health & Beauty GX Holdings Limited | Financial services | 2023 |
| Health & Beauty GX Limited | Wholesale & retail | 2023 |
| Hearnes of Beaconsfield Limited | Wholesale & retail | 2012 |
| Heart Health Ltd | Health & social care | 2018 |
| Hearwego Audiology Limited | Wholesale & retail | 2018 |
| Heatherfields (Bordon) Management Company Limited | Households | 2019 |
| Heatherside Property Limited | Administrative & support | 2016 |
| Heathrow Workwear & Safety Solutions Ltd | Wholesale & retail | 2017 |
| Hecks Ltd | Professional & scientific | 2025 |
| Hedgerley Limited | Professional & scientific | 2025 |
| Hedsor Property Management Limited | Real estate | 2014 |
| HEF Property Management Ltd | Real estate | 2023 |
| Helenpanther.Com Ltd | Professional & scientific | 2025 |
| Hemmel Barn Limited | Hospitality | 2022 |
| Hera UK Global Ltd | Professional & scientific | 2022 |
| Herbarium Limited | Wholesale & retail | 2018 |
| Heritage Art and Design Limited | Other services | 2015 |
| Heritage Building Contractors Ltd | Construction | 2013 |
| Hertable Entertainment Ltd | Arts & recreation | 2024 |
| Hetherley Economy Hotels Limited | Hospitality | 2024 |
| HGI Heating & GAS Installations Ltd | Construction | 2017 |
| HH Secretarial Services Limited | Administrative & support | 2014 |
| Hibiscus Event Catering Ltd | Hospitality | 2011 |
| Hicks Baker Limited | Administrative & support | 2012 |
| Higgins Building Services Limited | Construction | 2001 |
| High Trees Communications Ltd | Information & communication | 2023 |
| Higham Consulting Limited | Professional & scientific | 2002 |
| Higham Investments Limited | Financial services | 2025 |
| Hightone Restorations Limited | Wholesale & retail | 2006 |
| Highway Capital PLC | Professional & scientific | 1994 |
| Hill END Home Limited | Wholesale & retail | 2026 |
| Hillier Holdings Investments Limited | Real estate | 2026 |
| Hillmotts LLP | | 2011 |
| Hillside Residential Limited | Construction | 2007 |
| Hilton Property Developments Limited | Wholesale & retail | 2006 |
| Hilton Stroud Limited | Real estate | 2015 |
| Hine Law Racing Limited | Professional & scientific | 2025 |
| Hine Solicitors Limited | Professional & scientific | 2014 |
| Hire Class (Beaconsfield) Limited | Administrative & support | 2008 |
| HIS Construction Limited | Construction | 2022 |
| Hive Project Management Ltd | Construction | 2024 |
| HJC Developments Limited | Construction | 2011 |
| Hliss ERP Limited | Professional & scientific | 2021 |
| Hogarth Design & Build Ltd | Construction | 2018 |
| Hogarth Property - 15 Hanger Lane Ltd | Real estate | 2017 |
| Hogarth Property - 20/24 High Street Ltd | Real estate | 2021 |
| Hogarth Property - 42 Lynton Road Ltd | Real estate | 2020 |
| Hogarth Property - 70 Hanger Lane Ltd | Real estate | 2019 |
| Hogback Consulting Limited | Information & communication | 2024 |
| Holdgrace Limited | Professional & scientific | 2003 |