| Heseltine Consulting Limited | Professional & scientific | 2026 |
| Hestia Homes London Limited | Construction | 2022 |
| HFW Consulting Limited | Professional & scientific | 2022 |
| HGM Group Ltd | Administrative & support | 2024 |
| HH Digital Consulting Ltd | Information & communication | 2023 |
| HH Mini Market Limited | Wholesale & retail | 2026 |
| HH Supplements Ltd | Wholesale & retail | 2021 |
| Hhgc Trustee Limited | Arts & recreation | 2019 |
| HHL Enterprises Limited | Administrative & support | 2010 |
| Hi-Fi Fibre Optics Ltd | Other services | 2023 |
| HIA Consulting Ltd | Professional & scientific | 2014 |
| Hicatee Conservation Limited | Professional & scientific | 2025 |
| Hicks Towers Ltd | Administrative & support | 2014 |
| Higareda Holdings Ltd | Real estate | 2024 |
| Higareda Limited | Hospitality | 2012 |
| High Voltage Resources Ltd | Construction | 2013 |
| High Weald Co. Ltd | Wholesale & retail | 2026 |
| Highbrook Vineyard Limited | Agriculture & fishing | 2019 |
| Highbrook Wine Estate Limited | Manufacturing | 2019 |
| Highdown Developments Ltd | Construction | 2021 |
| Highland Security Systems Limited | Administrative & support | 2020 |
| Highland Tower Co. Limited | Professional & scientific | 1984 |
| Hike Design Limited | Administrative & support | 2007 |
| Hike Properties Limited | Real estate | 2016 |
| Hillsdown Farm Ltd | Agriculture & fishing | 2022 |
| Hillside Pottery Limited | Education | 2023 |
| Hired-Hospitality Ltd | Administrative & support | 2025 |
| Hive Support (Westminster) CIC | Administrative & support | 2026 |
| Hive Support Ltd | Administrative & support | 2019 |
| Hixson Upstream Services Limited | Professional & scientific | 2014 |
| Hksb Ltd | Construction | 2011 |
| HLK Interiors Ltd | Professional & scientific | 2025 |
| Hoadlands Technical Consultancy Ltd | Professional & scientific | 2025 |
| Hobart Court Residents Management Company Limited | Households | 2011 |
| Hocken Construction Limited | Construction | 2016 |
| Hodgson Accountancy and Tax Limited | Professional & scientific | 2020 |
| Hoffmann & Rathbone LLP | | 2010 |
| Hohe Consulting Ltd | Other services | 2020 |
| Holberts Limited | Real estate | 2022 |
| Holder Tree Services Ltd | Agriculture & fishing | 2014 |
| Holdlynn Limited | Wholesale & retail | 1978 |
| Holford and Sons Limited | Construction | 2019 |
| Holidays in France Limited | Real estate | 2013 |
| Holistic Harmony Haven Therapies C.I.C. | Education | 2025 |
| Hollyh Limited | Information & communication | 2013 |
| Hollytree Estate Sussex Limited | Construction | 2026 |
| Holmwood Capital Investments Ltd | Financial services | 2017 |
| Holroyd Homes Ltd | Real estate | 2010 |
| Home and Hearth Interiors Ltd | Wholesale & retail | 2025 |
| Home Anywhere Limited | Hospitality | 2019 |
| Home Safe Housing | Real estate | 2003 |
| Home Safe Social Delivery Limited | Professional & scientific | 2022 |
| Home Safe Veterans & Homeless Support Limited | Health & social care | 2024 |
| HOMEROCHA1973 Ltd | Real estate | 2025 |
| Homes & Prime Properties Ltd | Real estate | 2016 |
| Homes LJS Ltd | Construction | 2025 |
| Homesmiths Ltd | Construction | 2001 |
| Homeyer Consulting Ltd | Professional & scientific | 2025 |
| Homo Sapiens Media Limited | Information & communication | 2015 |
| Honeybunn Breen Castle Limited | Real estate | 2024 |
| Honeybunn Breen Holdings Limited | Financial services | 2024 |
| Honolulu Blue Ltd | Professional & scientific | 2023 |
| Hooper Interiors Ltd | Construction | 2010 |
| Hope Remains Ltd | Wholesale & retail | 2025 |
| Horgan Hills Electrical Contractors Ltd | Construction | 2017 |
| Horizon Drone Inspection Limited | Professional & scientific | 2021 |
| Hornblower Publishing Limited | Information & communication | 2018 |
| Horrexcole Ltd | Administrative & support | 2015 |
| Horsham Sports Injury Clinic Limited | Health & social care | 2014 |
| Horsted Plumbing and Heating Ltd | Construction | 2025 |
| Hospitality Management Solutions LLP | | 2009 |
| Hot Air Limited | Arts & recreation | 1995 |
| Hound Enterprises Ltd | Professional & scientific | 2012 |
| House In&Out Ltd | Wholesale & retail | 2014 |
| Hova Villas Limited | Real estate | 2004 |
| Hove Hospitality Ltd | Professional & scientific | 2021 |
| Hoven Services Limited | Transport & logistics | 2007 |
| HOW on Earth Limited | Administrative & support | 2008 |
| HOW to Basically Ltd | Education | 2021 |
| Howes Sporting Limited | Arts & recreation | 2021 |
| Howler Monkey Records Ltd | Information & communication | 2019 |
| HOX Group Ltd | Construction | 2019 |
| Hoxton Coffee Company Limited | Manufacturing | 2015 |
| HQO Plumbing & Heating Services Ltd | Construction | 2016 |
| HR Systems Limited | Information & communication | 2010 |
| HRK Healthcare Ltd | Health & social care | 2013 |
| Hscouriers&Haulage Ltd | Transport & logistics | 2025 |
| HSE360 Ltd | Professional & scientific | 2025 |
| HSP Legal Ltd | Professional & scientific | 2016 |
| HT Analytics Ltd | Information & communication | 2020 |
| Htssl Limited | Information & communication | 2014 |
| Hugo&Coco Ltd | Wholesale & retail | 2023 |
| Human View Media Ltd | Information & communication | 2019 |
| Hummingbee Holdings Ltd | Financial services | 2024 |
| Hungry Tomato Ltd | Information & communication | 2011 |
| Hurlingham International Limited | Manufacturing | 1993 |
| Hurst Consulting and Training Limited | Professional & scientific | 2022 |
| Hurstbury Ltd | Professional & scientific | 2019 |
| Hurstwood Accountants LLP | | 2001 |
| Hurstwood Keepsakes Ltd | Other services | 2022 |