| Hambli Limited | Wholesale & retail | 2021 |
| Hancock and Co Ventures Ltd | Administrative & support | 2025 |
| Hanover Builders Limited | Extraterritorial | 2015 |
| Hanover Building Management Limited | Professional & scientific | 2015 |
| Happy Cleaning Ltd | Construction | 2017 |
| Hapyhouse Maintenance Limited | Construction | 2023 |
| Hardys Properties Ltd | Real estate | 2023 |
| Harmony Music Studios Ltd | Information & communication | 2017 |
| Harris & Patel Opticians Limited | Health & social care | 2003 |
| Harvey Ceilings Limited | Administrative & support | 2001 |
| Harwats Property Solutions Limited | Real estate | 2026 |
| Haselbury Limited | Other services | 2013 |
| Hatton Garden Jeweller (London) Limited | Manufacturing | 2017 |
| Hatzola Canvey Ltd | Health & social care | 2019 |
| Hauptwerk Made Easy Limited | Wholesale & retail | 2017 |
| Hawes & SON Limited | Professional & scientific | 2020 |
| Hawkesbury Pre-School Limited | Education | 2011 |
| Hawkwise Pest Control Limited | Real estate | 2011 |
| Hawkwise Pest Control Services Limited | Administrative & support | 2023 |
| Haystack Corner Limited | Real estate | 2021 |
| Headissimo Limited | Wholesale & retail | 1975 |
| Health Shotz Ltd | Health & social care | 2019 |
| Hear ME Scientific Limited | Information & communication | 2015 |
| Heath Products Limited | Wholesale & retail | 2006 |
| Heatsourceuk Limited | Construction | 2025 |
| Heddmara One Limited | Professional & scientific | 1995 |
| Helen Joubert Ltd | Professional & scientific | 2009 |
| Helish Limited | Wholesale & retail | 2023 |
| Helix Water Services Limited | Water & waste | 2025 |
| Hello My Friend Limited | Health & social care | 2026 |
| Helmet Hygiene Ltd | Other services | 2025 |
| Helpmefind | Information & communication | 2011 |
| Henrick Rose Limited | Construction | 2021 |
| Hern Home and Gardens Ltd | Households | 2021 |
| Herronway Limited | Construction | 2002 |
| Heyes Electrical Ltd | Construction | 2019 |
| Heyford Fields Narrowboats Limited | Extraterritorial | 2018 |
| Heyman Consulting Ltd | Information & communication | 2022 |
| Heyman Consulting Services Limited | Information & communication | 2024 |
| HFJ Consult Limited | Professional & scientific | 2023 |
| HGL Electrical Limited | Construction | 2026 |
| Hgss (Shipping Services) Limited | Administrative & support | 2017 |
| HHC Contracting Services Limited | Administrative & support | 2019 |
| HHC FM Limited | Administrative & support | 2019 |
| Higgins HR Limited | Administrative & support | 2024 |
| High Road Hockley Management (Essex) Limited | Households | 2018 |
| Highway Halo Limited | Wholesale & retail | 2025 |
| Highway Safety Holdings Limited | Financial services | 2019 |
| Highway Safety Management Limited | Transport & logistics | 2013 |
| Hill Croft (Braiswick) Management Company Limited | Households | 2021 |
| Hills Hair Care Ltd | Other services | 2011 |
| Hire Plus Limited | Administrative & support | 2000 |
| Hockley & Haynes Ltd | Wholesale & retail | 2023 |
| Holiday Wright Ltd | Administrative & support | 2024 |
| Holmes Electrical and Property Services Limited | Construction | 2024 |
| Holy Desserts Ltd | Manufacturing | 2025 |
| Homelyhousegoods Ltd | Wholesale & retail | 2025 |
| Homestead Land Development Limited | Construction | 1996 |
| Homestead Management Company Ltd | Professional & scientific | 2024 |
| Homestead PLC. Ltd | Construction | 1972 |
| Hometech Centre Limited | Information & communication | 2011 |
| Homeware Extra Ltd | Wholesale & retail | 2021 |
| Hot HUT Limited | Hospitality | 2018 |
| HRV12 Ltd | Hospitality | 2025 |
| Ht&J Trading Ltd | Wholesale & retail | 2025 |
| Hummingbird Developers Limited | Construction | 2024 |
| Huotop Ltd | Wholesale & retail | 2025 |
| HV Electrical and Utility Services Limited | Construction | 2016 |
| HV Upscale Events Ltd | Hospitality | 2025 |
| Hydroan Ltd | Wholesale & retail | 2015 |
| Hydroponix Limited | Wholesale & retail | 2015 |
| Hyland Carter Limited | Wholesale & retail | 2023 |
| Hyper Global Limited | Wholesale & retail | 2023 |
| I Love Fancy Dress Limited | Extraterritorial | 2018 |
| I M K Build Limited | Construction | 2002 |
| I P Autos Limited | Wholesale & retail | 2012 |
| I. Gundle Limited | Real estate | 1964 |
| IAN Varker Estate Planning Limited | Professional & scientific | 2025 |
| Icert Ltd | Construction | 2024 |
| Icetops Limited | Health & social care | 2026 |
| Iconix Group Limited | Wholesale & retail | 2016 |
| Ideal Brickwork Ltd | Construction | 2010 |
| IGS Surface Solutions Consulting Limited | Professional & scientific | 2019 |
| Igwe House Ltd | Professional & scientific | 2026 |
| II Create Ltd | Construction | 2026 |
| Ilfd Group Ltd | Wholesale & retail | 2009 |
| Ilfd Holdings Ltd | Financial services | 2022 |
| Image Cycles Limited | Wholesale & retail | 2017 |
| Imner Ltd | Construction | 1993 |
| Impact Security Installations Ltd | Administrative & support | 2012 |
| Impossible Creations Limited | Manufacturing | 2009 |
| Inbuild Construction Limited | Construction | 2014 |
| Infinite Automotive Limited | Wholesale & retail | 2023 |
| Innate Flourishing Limited | Health & social care | 2023 |
| Innocence Properties Limited | Financial services | 2001 |
| Innovantennas Limited | Information & communication | 2011 |
| Insight and Trust Consulting Ltd | Administrative & support | 2025 |
| Inspectpro Services Ltd | Administrative & support | 2024 |
| Inspired Health Chiropractic Ltd | Health & social care | 2015 |
| Intellect Wealth Limited | Professional & scientific | 2019 |