| Hashimi Craft Ltd | Wholesale & retail | 2024 |
| Hashimi Projects Limited | Construction | 2023 |
| Hasinogenie Ltd | Real estate | 2017 |
| Hast Hill Limited | Households | 1997 |
| Hatcher Holdings Ltd | Financial services | 2021 |
| Hatcher Property Investments Limited | Real estate | 2021 |
| Hatols Fostering Services Ltd | Health & social care | 2012 |
| Hatton Brooks Limited | Real estate | 2018 |
| Hatton Collective Ltd | Other services | 2021 |
| Hatton Garden Decorators Ltd | Construction | 2021 |
| Hattons Events Limited | Hospitality | 2017 |
| Haus-Events Ltd | Administrative & support | 2023 |
| Haven & Hedge Ltd | Administrative & support | 2025 |
| Haven and Hearth Properties Ltd | Construction | 2025 |
| Havensure Homes Limited | Real estate | 2024 |
| Havilah Estate Consultant Limited | Real estate | 2025 |
| Havilah Gold Limited | Information & communication | 2010 |
| Hawat Consultancy Ltd | Health & social care | 2016 |
| Hawk-Eye Accounting & Finance Ltd | Professional & scientific | 2023 |
| Hawkshead Construction & Renovation Ltd | Construction | 2025 |
| Hawthorne Investments Limited | Real estate | 2017 |
| Hayday Accounting Limited | Professional & scientific | 2016 |
| Hayes (Kent) Cricket Club Ltd | Arts & recreation | 2015 |
| Hayes (Kent) Lawn Tennis Club Limited | Arts & recreation | 2015 |
| Hayes Business Consulting Limited | Professional & scientific | 2020 |
| Hayes Business Logistics Ltd | Professional & scientific | 2018 |
| Hayes Fences Limited | Administrative & support | 2019 |
| Hayes Heating & Plumbing Services Ltd | Construction | 2023 |
| Hayes Hill Road Fund Limited | Households | 2008 |
| Hayes Launderette Ltd | Other services | 2026 |
| Hayes Mart Ltd | Wholesale & retail | 2016 |
| Hayes Warwick Investments Ltd | Financial services | 2019 |
| Hayes Wood Limited | Professional & scientific | 2009 |
| Hayesford Limited | Real estate | 2017 |
| Hayesford Park Company Limited | Real estate | 2011 |
| Hazelwood House (Shortlands) Management Company Limited | Households | 1971 |
| Hazelwood Park (Hainault) Management Company Limited | Households | 1989 |
| HB Buy to LET & Buy to Sell Limited | Real estate | 2021 |
| HB Property & Building Services Limited | Real estate | 2012 |
| HB Property Development & Management Consultancy Ltd | Construction | 2021 |
| HB Quality Practice Management Consultancy Ltd | Professional & scientific | 2023 |
| HBL Orthopaedics Ltd | Health & social care | 2025 |
| Hceb Ltd | Arts & recreation | 2021 |
| HCG International Travel Group (UK) Limited | Administrative & support | 2023 |
| HCG International Travel Group Britian Limited | Administrative & support | 2026 |
| HCH Marine Limited | Transport & logistics | 1997 |
| HDL Properties and Maintenance Limited | Construction | 2026 |
| HDM Sales & Marketing Ltd | Other services | 2025 |
| Headonizm Salon Limited | Other services | 2019 |
| Healey & Arokiasamy Partnership LLP | | 2017 |
| Healing Needle Ltd | Health & social care | 2023 |
| Healom Ltd | Health & social care | 2023 |
| Health & Safety Assessment Limited | Education | 2008 |
| Health & Wealth Associates Limited | Health & social care | 2007 |
| Health and Care Excellence Ltd | Health & social care | 2022 |
| Health Gain Limited | Health & social care | 2025 |
| Health Qigong Federation UK Ltd | Extraterritorial | 2010 |
| Health Quest Insights Ltd | Professional & scientific | 2023 |
| Healthcare Compliance Consultancy Ltd | Health & social care | 2014 |
| Healthmait - Health & Medical AI Training Ltd | Professional & scientific | 2026 |
| Healy Change Consulting Ltd | Professional & scientific | 2012 |
| Healy Heating Ltd | Construction | 2025 |
| Heart and Horizon Limited | Administrative & support | 2026 |
| Heart Residential Support Ltd | Health & social care | 2026 |
| Hearth & Herb Limited | Wholesale & retail | 2025 |
| Heat London Plumbing and Heating Limited | Construction | 2020 |
| Heathcliffe Interiors Ltd | Professional & scientific | 2022 |
| Heather Lodge Freehold Limited | Households | 2024 |
| Heather Wills Limited | Professional & scientific | 2012 |
| Heathfield Heating Ltd | Construction | 2025 |
| Heavy Goods Driven Limited | Transport & logistics | 2025 |
| Hectik Hair Ltd | Other services | 2013 |
| Hedc Limited | Professional & scientific | 2014 |
| Hedgecourt Estates Limited | Real estate | 2004 |
| Hedgevantage Limited | Financial services | 2012 |
| Hedgley Immigration Limited | Administrative & support | 2022 |
| Hedingham Animal Feeds Limited | Wholesale & retail | 2023 |
| Heds Law Ltd | Other services | 2017 |
| HEG Construction Ltd | Administrative & support | 2017 |
| Heidi's Care Consultant Ltd | Administrative & support | 2020 |
| Heidis House Ltd | Other services | 2022 |
| Helena and Elizabeth (Rotherhithe) RTM Company Limited | Real estate | 2026 |
| Helena Court Management Limited | Households | 1977 |
| Helena Square (Rotherhithe) RTM Company Limited | Real estate | 2026 |
| Helena Square 2 (Rotherhithe) RTM Company Limited | Real estate | 2026 |
| Helico (Manchester) Limited | Professional & scientific | 1979 |
| Helix Omics Advisory Ltd | Professional & scientific | 2025 |
| Helixion Technology Ltd | Information & communication | 2024 |
| Helixpoint Limited | Administrative & support | 2025 |
| Heller & Associates Limited | Other services | 1992 |
| Hellin Services Limited | Administrative & support | 2019 |
| Helpful Humans Ltd | Information & communication | 2021 |
| Henchcap Limited | Administrative & support | 2017 |
| Hend Krichen Ltd | Wholesale & retail | 2014 |
| Hendek Limited | Hospitality | 2007 |
| Henderson & Associates Limited | Professional & scientific | 2022 |
| Henderson Grehan Electrical Ltd | Construction | 2026 |
| Hengrace Consulting Limited | Information & communication | 2010 |
| Hengxin Oriental Food Limited | Wholesale & retail | 2022 |
| Henley House (London) RTM Company Limited | Real estate | 2021 |