| Hackea Ltd | Other services | 2019 |
| Hackett Trading Limited | Wholesale & retail | 2008 |
| Hadley Holdings Limited | Other services | 2017 |
| Hadron Data Networks Ltd | Information & communication | 2016 |
| Haggerty Academy Limited | Arts & recreation | 2023 |
| Hagibis LLP | | 2020 |
| Hair Essentials by Redz Ltd | Other services | 2025 |
| HAJ Music Ltd. | Information & communication | 2022 |
| Hakantekin Ltd | Health & social care | 2025 |
| Hale Consultancy Services Limited | Professional & scientific | 2013 |
| Halina Trading Limited | Administrative & support | 2007 |
| Halistra Limited | Professional & scientific | 2021 |
| Hallgarden Ltd | Administrative & support | 2012 |
| Hallswelle Enterprises Ltd | Administrative & support | 2008 |
| Hamels Park Barns Management Company Limited | Households | 2004 |
| Hamperclose Limited | Professional & scientific | 1985 |
| Hampton (LDN) Limited | Administrative & support | 2002 |
| Hampton LDN Management Services Limited | Administrative & support | 2019 |
| Handpicked Recruitment Limited | Administrative & support | 2014 |
| Hands on Day Centre Limited | Health & social care | 2017 |
| Handsome Business Activities Ltd | Professional & scientific | 2011 |
| Hang IT Tight Solutions Limited | Manufacturing | 2018 |
| Hannah Nursery Limited | Agriculture & fishing | 2016 |
| Hannah Technologies Ltd | Professional & scientific | 2022 |
| Hanyard Associates Limited | Professional & scientific | 2010 |
| Happy Nina China Trading Ltd | Wholesale & retail | 2012 |
| Happy Pet Holdings Limited | Financial services | 2016 |
| Happy Pet Limited | Real estate | 2002 |
| Haque Group Limited | Real estate | 2017 |
| Harbour Futures Limited | Education | 2025 |
| Harding Hornby Limited | Administrative & support | 2025 |
| Hardstone Estates Ltd | Real estate | 2025 |
| Hareli Properties Ltd | Real estate | 2023 |
| Haremere Farms Limited | Real estate | 2013 |
| Harley Clinic Ltd | Professional & scientific | 2023 |
| Harley Hospital Ltd | Health & social care | 2012 |
| Harley Street Academy Limited | Administrative & support | 2009 |
| Harley Street Association Limited | Professional & scientific | 2021 |
| Harouni Group Limited | Administrative & support | 2017 |
| Harouni Group of Companies Limited | Real estate | 2011 |
| Harouni Holdings Limited | Administrative & support | 2017 |
| Harouni Investments Limited | Real estate | 2019 |
| Harrgraycole Signature Homes Ltd | Real estate | 2025 |
| Harrington Sinclair Limited | Professional & scientific | 2022 |
| Harris Rosenberg Limited | Administrative & support | 2014 |
| Harry Michael Photography Limited | Professional & scientific | 2020 |
| Harry Phillips Osteopathic Practice Limited | Health & social care | 2002 |
| Harry Sourcing Ltd | Administrative & support | 2026 |
| Hart Property Services Ltd | Households | 2024 |
| Harvest Moon Ventures Ltd | Real estate | 2022 |
| Haslemere Construction Limited | Construction | 1985 |
| Hatch END DP1 SPV Limited | Real estate | 2018 |
| Hauleen Consulting Ltd | Professional & scientific | 2022 |
| Haus Bar and Restaurant Ltd | Hospitality | 2022 |
| Havana Estates Limited | Real estate | 2016 |
| Haven and HUE Limited | Professional & scientific | 2025 |
| Haven Direct Limited | Extraterritorial | 2017 |
| Haven Heating Limited | Extraterritorial | 2017 |
| Haven Home Solutions Limited | Construction | 2017 |
| Haven Online Limited | Extraterritorial | 2017 |
| Haverstock Management Company Limited | Real estate | 1999 |
| Havill Limited | Professional & scientific | 2016 |
| Hawchester Watches Limited | Wholesale & retail | 2018 |
| Hawkshead Holdings Limited | Real estate | 2022 |
| Hawthorne Wills Ltd | Professional & scientific | 2020 |
| Haycroft Investment Limited | Real estate | 2021 |
| Haydar Deniz Ltd | Hospitality | 2020 |
| Hayva Services Ltd | Administrative & support | 2020 |
| Haywood Estates Limited | Real estate | 1947 |
| HAZ JEM Limited | Real estate | 2019 |
| HCA Homes Limited | Real estate | 2025 |
| HCM Music Academy Limited | Other services | 2021 |
| HCM Personnel Limited | Professional & scientific | 2023 |
| Headcroft Limited | Other services | 1996 |
| Health Drinks Services Ltd | Wholesale & retail | 2022 |
| Healthcare Advisors Limited | Professional & scientific | 2017 |
| Healthcare One for ALL Ltd | Health & social care | 2020 |
| HEALTHHUB360 Ltd | Administrative & support | 2017 |
| Healthy Hearts Fitness Ltd | Other services | 2015 |
| Healthy Heating Ltd | Construction | 2007 |
| Hearth and Home Properties Ltd | Real estate | 2014 |
| Hearts & Hounds Ltd | Other services | 2022 |
| Heathwood Properties Ltd | Real estate | 2019 |
| Heldon Limited | Real estate | 1998 |
| Helen Nicolas Accounting Solutions Limited | Professional & scientific | 2004 |
| Heliotech Ltd | Professional & scientific | 2018 |
| Helix Estates Limited | Real estate | 2011 |
| Hellenic Express Transport Ltd | Transport & logistics | 2026 |
| Help Technical Ltd | Information & communication | 2025 |
| Hematite Aesthetics Clinic Ltd | Health & social care | 2024 |
| Hencon Limited | Real estate | 1997 |
| Henry Beckwith Limited | Households | 2003 |
| Hephib Limited | Real estate | 2019 |
| Herb Farm Granaries Management Company Limited | Households | 2019 |
| Heritage Care Placee Limited | Health & social care | 2025 |
| Heritage Construct Ltd | Construction | 2024 |
| Heritage LDN Ltd | Real estate | 2021 |
| Hermes Corporate Services Ltd | Administrative & support | 2013 |
| Hermieshop Limited | Wholesale & retail | 2020 |
| Hertford Flooring Limited | Construction | 2014 |