| Hdmn UK Ltd | Wholesale & retail | 2025 |
| Hdtv Services Limited | Information & communication | 2006 |
| HE, Yung & LAU Holdings Ltd | Real estate | 2018 |
| Headmasters (Green Street Green) Limited | Other services | 2014 |
| Health Salvation Ltd | Public administration | 2025 |
| Health Wolves Ltd | Health & social care | 2023 |
| HEALTH2U Limited | Health & social care | 2021 |
| Healthcare London Limited | Health & social care | 2015 |
| Healthy Breathing Limited | Professional & scientific | 2024 |
| Heap's Sausages Limited | Manufacturing | 2011 |
| Heart KBB Ltd | Manufacturing | 2024 |
| Heathfield Media Ltd | Professional & scientific | 2021 |
| Heathside Digital Consulting Limited | Information & communication | 2025 |
| Helm & Sons Ltd | Professional & scientific | 2024 |
| Helm Enterprise Solutions Ltd | Professional & scientific | 2010 |
| Help With My Group Ltd | Financial services | 2024 |
| Helpme Safety Ltd | Information & communication | 2026 |
| Hench Capital Ltd | Administrative & support | 2016 |
| Henderson-Ure Building and Construction Ltd | Construction | 2014 |
| Heng XIN Supermarket Limited | Wholesale & retail | 2017 |
| Heniam Ltd | Construction | 2009 |
| Henle Eyes Ltd | Health & social care | 2023 |
| Henlot Consulting Limited | Professional & scientific | 2021 |
| Henry George Bathrooms & Kitchens Ltd | Wholesale & retail | 2023 |
| Henry Paschal & Brothers Ltd | Health & social care | 2017 |
| Henwoode Limited | Administrative & support | 2015 |
| HER Aesthetics Limited | Other services | 2019 |
| HER Hair and Beauty Ltd | Wholesale & retail | 2023 |
| Heritage Brick Pointing Limited | Construction | 2023 |
| Heritage Consult Limited | Professional & scientific | 2009 |
| Heritage Masonry Services Limited | Professional & scientific | 2024 |
| Heritage Resource Group Ltd | Administrative & support | 2021 |
| Heritage Windows Joinery Ltd | Information & communication | 2021 |
| Hermit Crystals Ltd | Wholesale & retail | 2024 |
| Heron Digital Ltd | Information & communication | 2024 |
| Herridge Carpentry Limited | Construction | 2009 |
| Hever & Sons Decorating Ltd | Construction | 2025 |
| Hever Plastering Wizard Ltd | Construction | 2025 |
| Hextable Cars UK Ltd | Wholesale & retail | 2024 |
| Hexter Consulting Limited | Professional & scientific | 2013 |
| HFA Derby Limited | Administrative & support | 2025 |
| HG Sims Property Limited | Real estate | 2024 |
| HI Glow Heating Limited | Manufacturing | 2005 |
| Hibernia Construction Limited | Construction | 2023 |
| Hicks & Beswarick Properties Limited | Real estate | 2020 |
| Hicks Estate Agents Limited | Extraterritorial | 2003 |
| Hidden Beauty Orpington Limited | Other services | 2021 |
| Hidden Value Ltd | Administrative & support | 2025 |
| High Bricks Ltd | Real estate | 2022 |
| High Elms Properties Limited | Real estate | 2017 |
| High Gables Management Company Limited | Households | 1971 |
| High Point Roofing Services Ltd | Construction | 2023 |
| High Street 66 Limited | Extraterritorial | 2014 |
| High Street Cakes Limited | Wholesale & retail | 2024 |
| Higher Living Food Ltd | Hospitality | 2021 |
| Higher Quality Aluminium Product Ltd | Manufacturing | 2016 |
| Highfield Gardens Limited | Administrative & support | 2025 |
| Highlands Haven Ltd | Health & social care | 2022 |
| Highmore PR Limited | Professional & scientific | 2011 |
| Highway Care Group Limited | Other services | 1980 |
| Hilight Ltd | Professional & scientific | 2021 |
| Hill Engineering (Catford) Limited | Manufacturing | 1954 |
| Hill Fire & Security Limited | Water & waste | 2009 |
| Hillharveywood LLP | | 2019 |
| Hills Tail Lifts & Shutter Repairs Ltd | Other services | 2019 |
| Hillside Drive Management Company Limited | Professional & scientific | 1997 |
| Hillstream Ltd | Real estate | 2022 |
| Hiraeth Holdings Limited | Real estate | 2023 |
| Hiram Cuts Limited | Other services | 2022 |
| Historic & Listed UK Ltd | Construction | 2019 |
| Hitman Fight League Limited | Arts & recreation | 2023 |
| Hjbains Ltd | Professional & scientific | 2016 |
| HK Consulting Works Ltd | Financial services | 2025 |
| Hksf Property LLP | | 2020 |
| HLC Developments Ltd | Real estate | 2018 |
| HLV Services Ltd | Extraterritorial | 2024 |
| HM Home London Ltd | Wholesale & retail | 2017 |
| HM3 Surveying Ltd | Construction | 2024 |
| Holden Park Care Limited | Education | 2004 |
| Hollingbourne Tower Management Company Limited | Households | 2006 |
| Hollywyle Limited | Real estate | 2015 |
| Holmbridge Gardens Ltd | Administrative & support | 2022 |
| Holmcrest Consulting Limited | Professional & scientific | 2017 |
| Holmes Resources Limited | Professional & scientific | 2015 |
| Holwood Homes Limited | Construction | 2024 |
| Holy Innocents Catholic Primary School | Education | 2015 |
| Home and the City Ltd | Real estate | 2018 |
| Home Care & Support Limited | Health & social care | 2013 |
| Home Counties Financial Services Ltd | Financial services | 2017 |
| Home Deal Solution Ltd | Real estate | 2025 |
| Home Farm Management (Chelsfield) Limited | Real estate | 2001 |
| Home Finance Advice Building and Contents Limited | Financial services | 2010 |
| Home Finance Advice Holdings Limited | Professional & scientific | 2012 |
| Home Finance Advice Solutions Limited | Professional & scientific | 2025 |
| Home First OT Solutions Limited | Public administration | 2023 |
| Home Grow Aquaponics Ltd | Manufacturing | 2022 |
| Home of Comfort by Mark Ltd | Other services | 2026 |
| Home Philosophy Ltd | Construction | 2015 |
| Home Star Cleaning Ltd | Administrative & support | 2013 |
| Homeclean (Kent) Ltd | Administrative & support | 2019 |