| HP Haulage Hub Ltd | Transport & logistics | 2025 |
| HP Promise Limited | Wholesale & retail | 2015 |
| HPR Plumbing & Heating Ltd | Extraterritorial | 2023 |
| HPR Services Ltd | Construction | 2015 |
| Hprl Developments Ltd | Real estate | 2021 |
| HR Champions Limited | Administrative & support | 2002 |
| HR Cloud Ltd | Professional & scientific | 2023 |
| HR Worldwide Limited | Administrative & support | 2003 |
| HRK Technology PVT Ltd | Information & communication | 2026 |
| Hrzr Investment Ltd | Wholesale & retail | 2024 |
| HSA Group Limited | Financial services | 2016 |
| HSB Online Store Ltd | Wholesale & retail | 2025 |
| HSC Auto Centre Limited | Wholesale & retail | 2013 |
| HSJ Property Ltd | Households | 2016 |
| HSN Group Ltd | Construction | 2021 |
| Hsqe Gloucestershire Limited | Other services | 2017 |
| HSS Automation Services Limited | Professional & scientific | 2025 |
| HT Fabrications (Stroud) Limited | Professional & scientific | 2017 |
| Hucclecote Building Services Ltd | Construction | 2012 |
| Hucclecote Enterprise Ltd | Wholesale & retail | 2020 |
| Hucclecote Retirement Properties Limited | Real estate | 2002 |
| Hucclecote Social Club (2012) Limited | Hospitality | 2012 |
| Hudson Baker Ltd | Administrative & support | 2010 |
| Hudson Butlers Corporation Ltd | Administrative & support | 2011 |
| Hugh Wheatley ENT Services Ltd | Health & social care | 2011 |
| Hugo Swadlincote Limited | Administrative & support | 2025 |
| Hugo Valeting Ltd | Administrative & support | 2019 |
| Hulins Ltd | Manufacturing | 2007 |
| Hulk Construction Gloucester Limited | Construction | 2019 |
| Humain Collective Ltd | Information & communication | 2025 |
| Human Built Ltd | Information & communication | 2025 |
| Human Engineering 2020 Limited | Professional & scientific | 2020 |
| Human Rights Research Limited | Administrative & support | 2014 |
| Human Synergy Ltd | Professional & scientific | 2008 |
| Humanleap Ltd | Other services | 2023 |
| Humbroj Ltd | Construction | 2024 |
| Humro Tech Solutions Ltd | Information & communication | 2022 |
| Hundred Heroines | Education | 2019 |
| Hungry Hill Ltd | Professional & scientific | 2024 |
| Hunter Ellis Ltd | Professional & scientific | 2023 |
| Hunter Pearce Ltd | Construction | 2021 |
| Hunter SFS Limited | Professional & scientific | 2025 |
| Huntington Associates Limited | Professional & scientific | 2013 |
| Huntley Aquatics Ltd | Wholesale & retail | 2025 |
| Hush Interiors Limited | Construction | 2025 |
| Husqod Support Services Limited | Health & social care | 2025 |
| Husseini Limited | Wholesale & retail | 2024 |
| Hvac Careers Ltd | Administrative & support | 2019 |
| Hybridyne Systems Ltd | Professional & scientific | 2020 |
| Hyderus Craye Limited | Professional & scientific | 2004 |
| Hydrachrome Engineering Limited | Manufacturing | 2011 |
| Hydraparts Ltd | Extraterritorial | 2026 |
| Hydrouk Group Limited | Financial services | 2025 |
| Hydrouk Limited | Wholesale & retail | 2023 |
| Hygienebusters Limited | Administrative & support | 2003 |
| Hygienic Commercial Interiors Limited | Construction | 2004 |
| Hygrove Corporation Ltd | Real estate | 2024 |
| Hyiba Rose Ltd | Health & social care | 2017 |
| Hylion Capital Ltd. | Water & waste | 2021 |
| Hypergrowth Recruitment Ltd | Administrative & support | 2020 |
| Hypertrade Enterprise Ltd | Wholesale & retail | 2023 |
| Hypevio Limited | Information & communication | 2023 |
| Hyphen - 21 (Supporting Community) | Health & social care | 1994 |
| I & V Construction Limited | Construction | 2017 |
| I a Property Investment Ltd | Real estate | 2021 |
| I AM Illumes Ltd | Manufacturing | 2024 |
| I Hosting Ltd | Information & communication | 2024 |
| I Johns Business Consultancy Limited | Professional & scientific | 2022 |
| I'Tal Decorators Limited | Construction | 2003 |
| I.Mateiu Logistics Ltd | Transport & logistics | 2019 |
| I.S.D. Cold Stores Limited | Extraterritorial | 1952 |
| I.T. B2B Limited | Information & communication | 2008 |
| Iacopi Palmer Limited | Professional & scientific | 2019 |
| Iadviser Limited | Financial services | 2005 |
| IAN Taylor Mean Ltd | Professional & scientific | 2014 |
| IAN Thomson Healthcare Consultancy Limited | Other services | 2011 |
| IAN Webb Ltd | Information & communication | 2025 |
| IB Chauffeurs Ltd | Wholesale & retail | 2017 |
| IBB IT Security Limited | Administrative & support | 2018 |
| IC Nuclear Ltd | Professional & scientific | 2022 |
| ICC Machinery Limited | Manufacturing | 2022 |
| Iceberg Outsourcing Services Ltd | Administrative & support | 2021 |
| Icilda's V Kitchen Ltd | Hospitality | 2020 |
| Icomat Limited | Manufacturing | 2019 |
| Icon.Net Limited | Information & communication | 1997 |
| ICRE8TE Limited | Administrative & support | 2010 |
| ICS Holdings Limited | Financial services | 2026 |
| ID Electrical Services Ltd | Construction | 2023 |
| ID Property Alliance Ltd | Real estate | 2022 |
| Ideal Aire Ltd | Energy | 2025 |
| Ideal Mosaic Limited | Wholesale & retail | 2016 |
| Ideators Digital Ltd | Information & communication | 2022 |
| Idola Motorsport Ltd | Arts & recreation | 2021 |
| Idyllic Homelife Limited | Real estate | 2025 |
| IEA Commercial Limited | Construction | 2025 |
| IEA Services Limited | Construction | 2024 |
| Iestyn Rees Ltd | Other services | 2025 |
| IFP Mortgages Limited | Financial services | 1994 |
| Ifti Properties Ltd | Real estate | 2025 |
| IG Aero Ltd | Professional & scientific | 2024 |