| Hurstanger Holdings Ltd | Financial services | 2018 |
| Hurstanger Property Limited | Real estate | 2024 |
| Hurstfirst Ltd | Wholesale & retail | 2017 |
| Hush Heath Inns Limited | Hospitality | 2017 |
| Hussainautos Limited | Wholesale & retail | 2025 |
| Husum Way (Kidderminster) Limited | Construction | 2021 |
| HV Elec Services Ltd | Construction | 2020 |
| HV Tech Electrics Limited | Construction | 2019 |
| Hvac Energies Limited | Construction | 2024 |
| HVC Homes Limited | Other services | 2016 |
| Hvtb Consulting Limited | Administrative & support | 2012 |
| HWA (Structural Engineers) Limited | Professional & scientific | 2017 |
| Hwbt Plus Ltd | Other services | 2026 |
| Hwhj Consulting Limited | Professional & scientific | 2025 |
| HX5 Ltd | Professional & scientific | 2024 |
| HXB Property Services Limited | Real estate | 2024 |
| Hy-Met Limited | Professional & scientific | 2021 |
| Hybrid Access Limited | Information & communication | 2008 |
| Hyde & Home (Chipping Norton) Limited | Wholesale & retail | 2022 |
| Hydrogen Bristol Limited | Real estate | 2016 |
| Hydrogen Falmouth Limited | Real estate | 2010 |
| Hydrogen Glasgow Limited | Real estate | 2023 |
| Hydrogen Nechells Limited | Real estate | 2012 |
| Hydrogen Student Developments Limited | Real estate | 2019 |
| Hydrogen Student Rentals Falmouth Limited | Real estate | 2022 |
| HYDROPONICS4LESS Ltd | Wholesale & retail | 2015 |
| Hyhot Limited | Professional & scientific | 2017 |
| Hyperion Electrical Solutions Limited | Construction | 2010 |
| Hytro Homes Ltd | Construction | 2024 |
| HYU Hussain Limited | Professional & scientific | 2023 |
| Hyyc Consulting Ltd | Information & communication | 2026 |
| I & a Consultants Ltd | Transport & logistics | 2020 |
| I & a Plumbing & Heating Ltd | Other services | 2017 |
| I & G Properties Limited | Administrative & support | 2011 |
| I 3 Trading Limited | Professional & scientific | 2010 |
| I AM Emma Robinson Limited | Professional & scientific | 2023 |
| I AM the Chauffeur Limited | Transport & logistics | 2023 |
| I B Yeomans Flooring Limited | Construction | 2006 |
| I Drive Vehicle Rental Limited | Administrative & support | 2013 |
| I Have a Cunning Plan Ltd | Information & communication | 2020 |
| I Hunjan Limited | Wholesale & retail | 2006 |
| I M Properties Investment (BB) Limited | Real estate | 2023 |
| I M Properties Investments Hsbc 2 Limited | Real estate | 2019 |
| I M Properties Residential Limited | Real estate | 2021 |
| I M Properties Strategic Land Group Limited | Real estate | 2016 |
| I Mood Limited | Wholesale & retail | 2022 |
| I Robo Ltd | Wholesale & retail | 2003 |
| I&A Heating Ltd | Construction | 2023 |
| I&C Tax Accountants Ltd | Professional & scientific | 2020 |
| I&S Electrical Services Ltd | Construction | 2020 |
| I-Res Limited | Real estate | 2015 |
| I-Tax & Company Limited | Professional & scientific | 2005 |
| I-Wave Limited | Professional & scientific | 2003 |
| I. G. Software Solutions Limited | Information & communication | 2000 |
| I. M. Properties (BVP 1) Limited | Real estate | 2014 |
| I. M. Properties (BVP 2) Limited | Real estate | 2014 |
| I.M. Facilities Limited | Professional & scientific | 1991 |
| I.M. Finance Limited | Administrative & support | 2005 |
| I.M. Financial Services Limited | Administrative & support | 1994 |
| I.M. Funding Limited | Professional & scientific | 2003 |
| I.M. Group (Ensleigh) Limited | Real estate | 2013 |
| I.M. Group Limited | Professional & scientific | 1997 |
| I.M. Holdings Limited | Professional & scientific | 1993 |
| I.M. Maps (UK) Limited | Wholesale & retail | 2012 |
| I.M. MV (UK) Distributors Limited | Wholesale & retail | 2025 |
| I.M. Nelcv (UK) Limited | Wholesale & retail | 1979 |
| I.M. NEV Motor Distributors (UK) Limited | Wholesale & retail | 2021 |
| I.M. NSC (UK) Limited | Wholesale & retail | 2012 |
| I.M. Parts and Service Limited | Wholesale & retail | 1992 |
| I.M. Properties (Abbey) Limited | Real estate | 1996 |
| I.M. Properties (Coleshill) Limited | Construction | 2001 |
| I.M. Properties (Croydon) Limited | Professional & scientific | 2011 |
| I.M. Properties (Guildford 2) Limited | Professional & scientific | 2003 |
| I.M. Properties (Logistics) Limited | Real estate | 2008 |
| I.M. Properties (Longton) Limited | Real estate | 2000 |
| I.M. Properties (Maidenhead) Limited | Professional & scientific | 1994 |
| I.M. Properties (Reading 2) Limited | Professional & scientific | 2003 |
| I.M. Properties (WHB) Limited | Real estate | 1997 |
| I.M. Properties Development Limited | Construction | 1997 |
| I.M. Properties Finance Limited | Extraterritorial | 1992 |
| I.M. Properties Investment Limited | Real estate | 1994 |
| I.M. Properties Limited | Professional & scientific | 1997 |
| I.M. Trade Assist Limited | Professional & scientific | 1997 |
| I.M. UK Trade Company Limited | Professional & scientific | 2015 |
| I.M. Vehicle Rentals Limited | Administrative & support | 1997 |
| IA Strategy Ltd | Health & social care | 2025 |
| Iago Properties Limited | Hospitality | 2023 |
| Iain Denton Ltd. | Professional & scientific | 2006 |
| IAN M Electrical Services Limited | Construction | 2010 |
| IB Civil Engineering Limited | Professional & scientific | 2011 |
| Ibahn Limited | Information & communication | 2005 |
| Ibex Accountants Ltd | Professional & scientific | 2023 |
| Ibinsights Ltd. | Administrative & support | 2014 |
| Iblinq Hair and Beauty Ltd | Other services | 2018 |
| IBS Precision Engineering Limited | Professional & scientific | 2018 |
| IC Lastmile UK Holdings Limited | Financial services | 2023 |
| Icarus and Matis Ltd | Other services | 2007 |
| Iccon Property Group Ltd | Real estate | 2022 |
| Icdp Limited | Professional & scientific | 2007 |
| Ice Rink Fishbar Ltd | Hospitality | 2014 |