| Hampton Tower Limited | Real estate | 2020 |
| Hamza Hammad Ltd | Wholesale & retail | 2025 |
| Hamza Limited | Real estate | 2018 |
| Hamza Pro Ltd | Wholesale & retail | 2024 |
| HAN & Associates Limited | Professional & scientific | 2016 |
| Han&Bobby Consulting Ltd | Professional & scientific | 2022 |
| Han'Ei Investments Limited | Real estate | 2021 |
| Hancock Artists Ltd | Arts & recreation | 2025 |
| Hancock Rubber Machinery (UK) Ltd | Wholesale & retail | 2008 |
| Hand to Heart Home Care Ltd | Health & social care | 2025 |
| Handy Removals Limited | Water & waste | 2025 |
| Handy Stores London Limited | Wholesale & retail | 2013 |
| Handymax Holdco Limited | Transport & logistics | 2021 |
| Hanext Europe Construction Limited | Construction | 2005 |
| Hank Services Ltd | Transport & logistics | 2025 |
| Hanna Accounting Limited | Professional & scientific | 2012 |
| Hanover Investment Holdings Ltd | Real estate | 2019 |
| Hans Holdings Ltd | Manufacturing | 2019 |
| Hans Tour Exhibition Ltd | Administrative & support | 2017 |
| Hansun Ltd | Wholesale & retail | 2024 |
| Happy Days Montessori Ltd | Education | 1998 |
| Happy Humans Private Ltd | Manufacturing | 2019 |
| Happy Retail Ltd | Wholesale & retail | 2022 |
| Happylink Ltd | Construction | 2011 |
| Happyways Travels & Hospitality Limited | Administrative & support | 2019 |
| Haraka Tours Limited | Administrative & support | 2022 |
| Haraya Studios Ltd | Information & communication | 2026 |
| Harbor OPS Ltd | Information & communication | 2026 |
| Hardiman & Hardiman Limited | Administrative & support | 2020 |
| Hardip Ice Ltd | Hospitality | 2015 |
| Hardip Stores Ltd | Other services | 2014 |
| Hardman Road NO 50 Limited | Households | 2005 |
| Harekrishna Ltd | Wholesale & retail | 2021 |
| Harewood Homes Limited | Real estate | 2022 |
| Hargovind Consultants Ltd | Transport & logistics | 2026 |
| Hari Villa Ltd | Construction | 2016 |
| Harish Group Limited | Professional & scientific | 1988 |
| Harish UK Ltd | Wholesale & retail | 2007 |
| Harlow Lubricants Limited | Wholesale & retail | 1991 |
| Harlowe Property Ltd | Real estate | 2021 |
| Harmax Ltd | Real estate | 2023 |
| Harmonic Solutions Ltd | Professional & scientific | 2015 |
| Harmony Global Group Ltd | Financial services | 2025 |
| Harmony Global Health Ltd | Health & social care | 2024 |
| Harmony Global Technologies Ltd | Information & communication | 2024 |
| Harmony Global-Uk Ltd | Wholesale & retail | 2020 |
| Harold Driving Instructor Ltd | Education | 2023 |
| Haroon Property Investment Ltd | Real estate | 2025 |
| Harper Capital Ltd | Hospitality | 2025 |
| Harper Vale Limited | Construction | 2012 |
| HARRI28 Ltd | Wholesale & retail | 2026 |
| Harrington (Properties) Limited | Construction | 1982 |
| Harrow Tamils Association Ltd | Health & social care | 2026 |
| Harrowdene Residents (Wembley) Limited | Real estate | 1970 |
| Harry's Driving School Ltd | Education | 2025 |
| Harshraj Limited | Wholesale & retail | 1980 |
| Harsuda Steels Ltd | Manufacturing | 2024 |
| Hartley Management Consultants Ltd | Other services | 2021 |
| Harvest Church London | Other services | 2004 |
| Harvist Limited | Professional & scientific | 2012 |
| HAS 29 Limited | Wholesale & retail | 2025 |
| Hasa Olive OIL UK Ltd | Wholesale & retail | 2025 |
| Hasan Consulting Limited | Professional & scientific | 2013 |
| Hashi Auto Ltd | Wholesale & retail | 2016 |
| Hashim Elyass Enterprises Limited | Wholesale & retail | 2025 |
| Hasmery Ltd | Wholesale & retail | 2026 |
| Hasri International Limited | Financial services | 2023 |
| Hatch Healthcare Ltd | Health & social care | 2025 |
| Hatchsol Ltd | Information & communication | 2025 |
| Hatlas Brickwork and Blockwork Ltd | Construction | 2022 |
| HAU Group Limited | Hospitality | 2018 |
| Haughley Block Plant Ltd | Manufacturing | 2020 |
| Hausofhg Ltd | Other services | 2026 |
| Havery Ltd | Financial services | 2024 |
| Hawk of London Ltd | Other services | 2017 |
| Hawk Rubbish Clearance Ltd | Water & waste | 2014 |
| Hawkmoon Advisors Limited | Professional & scientific | 2020 |
| Hawkstones Right Limited | Professional & scientific | 2020 |
| Hays Engineering Ltd | Real estate | 2022 |
| Hazara Corporation Ltd | Hospitality | 2018 |
| Haze 1824 Ltd | Real estate | 2024 |
| Hazelmead Limited | Administrative & support | 2014 |
| Hbindacut Ltd | Other services | 2021 |
| Hbondy Limited | Wholesale & retail | 2019 |
| Hbp-Wi Ltd | Financial services | 2024 |
| HBV Investments Limited | Real estate | 2018 |
| HCT Portland Limited | Administrative & support | 2017 |
| HD Heating Maintenance & Plumbing Services Ltd | Construction | 2022 |
| HD Records Limited | Arts & recreation | 2014 |
| HDA Driving Ltd | Education | 2025 |
| HDA Property Group Ltd | Real estate | 2025 |
| HDH Electrics Ltd | Construction | 2020 |
| Hdkx Limited | Wholesale & retail | 2025 |
| HDM Dental Laboratory Ltd | Manufacturing | 2015 |
| HE Estate Management Ltd | Real estate | 2025 |
| Healing Touch Consultancy Ltd | Administrative & support | 2024 |
| Healiya Holistic Health Limited | Health & social care | 2022 |
| Health and Wellness Farming Limited | Agriculture & fishing | 2025 |
| Healthcare Strategy Ltd | Professional & scientific | 2024 |
| Healthshare Mind Ltd | Health & social care | 2024 |