| Hextable Care Home Holdings Limited | Professional & scientific | 2015 |
| Hextable Care Home Limited | Construction | 2014 |
| Hextable Care Limited | Health & social care | 2015 |
| Hextable Land Limited | Construction | 2014 |
| HEY Rusty Ltd | Wholesale & retail | 2021 |
| Heydae Ltd | Professional & scientific | 2017 |
| HFI Distribution Limited | Transport & logistics | 2010 |
| HG Mead Lettings Limited | Real estate | 2024 |
| HH UK Holdings Ltd | Financial services | 2018 |
| HIG Estates Limited | Real estate | 2021 |
| Higgins Digital Ltd | Professional & scientific | 2021 |
| Highest Decoration Ltd | Construction | 2025 |
| Highest Services Ltd | Wholesale & retail | 2024 |
| Highfield Enterprise Ltd | Households | 2005 |
| Hikx Real Estate Ltd | Construction | 2024 |
| Hilltop Two Limited | Real estate | 2000 |
| Hillview Physiotherapy & Sports Injuries Clinic Ltd | Health & social care | 2003 |
| Historical Enactments Ltd | Arts & recreation | 2012 |
| Hjortenbo Properties Ltd | Real estate | 2023 |
| Hkat Estate Ltd | Real estate | 2020 |
| HL Prop Co 1 Ltd | Financial services | 2025 |
| HL Prop Co Ltd | Financial services | 2025 |
| HM Regent Property Investments Ltd | Real estate | 2026 |
| HMA Automobiles Ltd | Wholesale & retail | 2017 |
| HMO HQ Ltd | Real estate | 2024 |
| Hoermann and Friends Ltd | Financial services | 2021 |
| Holistic Ventures Ltd | Professional & scientific | 2025 |
| Holtlant Properties Ltd | Real estate | 2021 |
| Home Horizon Ltd | Real estate | 2023 |
| Home Plumb UK Ltd | Construction | 2019 |
| Homeforyou Ltd | Real estate | 2021 |
| Homez Real Estate Ltd | Real estate | 2020 |
| Honeybalm Ltd | Wholesale & retail | 2025 |
| Honig Realty UK Ltd | Real estate | 2025 |
| Hooper Group Ltd | Real estate | 2020 |
| Hooper Homes West Well Limited | Construction | 2011 |
| Hoopers Homes Limited | Construction | 2003 |
| Hoopers Homes Property Development Limited | Construction | 2008 |
| Hope for Paws Ltd | Other services | 2024 |
| Hope Investment and Properties Limited | Construction | 2014 |
| Hopkins Commerce Ltd | Wholesale & retail | 2026 |
| Horizon Capital Partners Limited | Professional & scientific | 2025 |
| Horizon Commodity Trading Ltd | Wholesale & retail | 2025 |
| Horizon K9 Ltd | Other services | 2024 |
| Horizon K9 Services Ltd | Other services | 2026 |
| Horizon Mandarin School Limited | Education | 2013 |
| Horizon Partners Capital Limited | Professional & scientific | 2025 |
| Horizon Quest Limited | Wholesale & retail | 2024 |
| Horsehill Holdings Ltd | Financial services | 2019 |
| Housetique Ltd | Real estate | 2022 |
| HOV Global Services Limited | Administrative & support | 1997 |
| Hoveair (Building Services) Limited | Construction | 1984 |
| Hoveair (Group) Limited | Construction | 2002 |
| Hoveair (Maintenance Services) Limited | Construction | 2002 |
| Hsiym Ltd | Professional & scientific | 2022 |
| Hspr Limited | Professional & scientific | 2013 |
| HST Convenience Ltd | Wholesale & retail | 2025 |
| Hulo Enterprises Limited | Wholesale & retail | 2016 |
| HUM Projects Limited | Real estate | 2020 |
| Human Relations Ltd | Administrative & support | 2021 |
| Humble Creations Limited | Hospitality | 2019 |
| Humpack Company Ltd | Professional & scientific | 2022 |
| Huntr Talent Group Limited | Administrative & support | 2023 |
| Huppertz Trading Limited Partnership | | 2008 |
| HWF Homes Ltd | Real estate | 2022 |
| Hygge Houses Ltd | Real estate | 2024 |
| Hypewave Allusion Ltd | Information & communication | 2025 |
| I&E Driver Ltd | Transport & logistics | 2017 |
| I'Timad Ltd | Professional & scientific | 2024 |
| I-Learning Ltd | Professional & scientific | 2022 |
| I.C.E. Solutions Limited | Real estate | 2000 |
| Iaccel Limited | Real estate | 2011 |
| Iatros Capital Estates Ltd | Real estate | 2025 |
| Icarus Leisure Soho Limited | Hospitality | 2013 |
| Iceberg Vision Ventures Ltd | Administrative & support | 2011 |
| Iceni Trading Ltd | Information & communication | 2017 |
| ICS International Club of Salestalents Ltd | Other services | 2024 |
| Ict-Partners Europe Limited | Information & communication | 2010 |
| IF Only Consulting Limited | Professional & scientific | 2020 |
| IFL Contracts Ltd | Information & communication | 2025 |
| IFL Management Limited | Administrative & support | 2002 |
| IGW Logistics Limited | Transport & logistics | 2020 |
| IJE Maintenance Ltd | Construction | 2017 |
| Ilja Realestate Ltd | Real estate | 2024 |
| ILLUMIN8 Trade Limited | Wholesale & retail | 2024 |
| Imagination Media Productions UK Ltd | Information & communication | 2022 |
| IMB Engineering Consultancy Limited | Professional & scientific | 2017 |
| Imperia Real Estate Ltd | Real estate | 2025 |
| Imperium Finance Ltd | Other services | 2019 |
| IN Motion Real Estate Ltd | Real estate | 2024 |
| Increase Group Limited | Administrative & support | 2019 |
| Inersa Ltd | Financial services | 2021 |
| Infidel Films Ltd | Information & communication | 2009 |
| Infinitum Publishing Ltd | Professional & scientific | 2026 |
| Infinitum Technologies Limited | Administrative & support | 2001 |
| Infinity & Beyond Technologies Limited | Information & communication | 2024 |
| Infinity Logistics Ltd | Transport & logistics | 2019 |
| Infintra Investments Ltd | Financial services | 2024 |
| Inflectiontech Limited | Information & communication | 2012 |
| Informal Media Ltd | Information & communication | 2025 |