| Hutchinsons Fruit & VEG Limited | Wholesale & retail | 2010 |
| Hutchison Project Management Solutions Ltd | Construction | 2020 |
| Hvhns Limited | Administrative & support | 2025 |
| Hvitr Ulfrinn Holdings Ltd | Information & communication | 2022 |
| HVT Wind Ltd | Construction | 2022 |
| HW Global Limited | Wholesale & retail | 2026 |
| HWH Investment Properties Ltd | Real estate | 2015 |
| HWH Offshore EAD Ltd | Administrative & support | 2017 |
| HWI Training Ltd | Education | 2026 |
| Hwtl Ltd | Information & communication | 2020 |
| Hybrid Fuel Ltd | Administrative & support | 2025 |
| Hybrid Gasification Ltd | Manufacturing | 2007 |
| Hybrid Ideas Ltd | Information & communication | 2024 |
| Hybrid Service Centre Ltd | Wholesale & retail | 2022 |
| Hyde Digital Consulting Services Ltd | Professional & scientific | 2025 |
| Hydrogen Energy Ltd | Information & communication | 2007 |
| Hydrology Supplier Limited | Water & waste | 2020 |
| Hydrology Supply Limited | Professional & scientific | 2019 |
| Hydrosure Limited | Water & waste | 2017 |
| Hyem Frames Ltd | Construction | 2025 |
| Hyem From Hyem Ltd | Real estate | 2021 |
| Hyem Landscape Ltd | Professional & scientific | 2024 |
| Hygge & Moss Ltd | Manufacturing | 2026 |
| Hylmary Court RTM Company Limited | Real estate | 2016 |
| Hylton Swam-J Limited | Hospitality | 2005 |
| Hymshaw Limited | Real estate | 2024 |
| Hymus Group Ltd | Financial services | 2023 |
| Hymus Hospitality Ltd | Financial services | 2023 |
| Hype Social Limited | Other services | 2022 |
| Hypericum Property Management Limited | Construction | 2016 |
| Hyperspan Data Ltd. | Manufacturing | 2024 |
| Hyprocleaning Services Ltd | Administrative & support | 2019 |
| Hyron AI Ltd | Information & communication | 2023 |
| HYT 88 Ltd | Hospitality | 2017 |
| Hzcollection Ltd | Wholesale & retail | 2026 |
| I & J Atkinson Property Limited | Real estate | 2025 |
| I AM Photography Limited | Professional & scientific | 2009 |
| I AM VIP Ltd | Professional & scientific | 2008 |
| I D Construction Services Ltd | Construction | 2002 |
| I Dickinson Engineering Ltd | Construction | 2025 |
| I DO Electrics Ltd | Construction | 2025 |
| I Fastnet Limited | Information & communication | 2012 |
| I FRY A&P Ltd | Hospitality | 2020 |
| I H Forestry Limited | Agriculture & fishing | 2014 |
| I I I Investments Ltd | Real estate | 2024 |
| I Laybourn & Company Limited | Professional & scientific | 2004 |
| I Love Coffee (NE) Ltd | Wholesale & retail | 2023 |
| I Love Dogs Ltd | Wholesale & retail | 2025 |
| I Tech Phones Ltd | Other services | 2015 |
| I to I Training and Consultancy Limited | Administrative & support | 2011 |
| I Want an Electrician Ltd | Construction | 2013 |
| I&Ia Ltd | Real estate | 2022 |
| I&Rc Ltd | Administrative & support | 2015 |
| I'Ll House YOU Limited | Real estate | 2020 |
| I-Maintenance NE Ltd | Administrative & support | 2018 |
| I.C.E.L. Power Systems Limited | Extraterritorial | 2000 |
| I.M Housing Solutions Ltd | Real estate | 2024 |
| I.M Property Group Ltd | Real estate | 2024 |
| I1 Maintenance Ltd | Construction | 2024 |
| I1 Property Seekers Ltd | Construction | 2021 |
| I1 Real Estate Ltd | Real estate | 2025 |
| I1G 7 Limited | Real estate | 2025 |
| I1G Developments Limited | Construction | 2022 |
| I1G Investments (MJ) Ltd | Real estate | 2023 |
| I1G Investments (MP) Ltd | Real estate | 2023 |
| I1G Investments (MZ) Ltd | Real estate | 2023 |
| I2CONTENT Limited | Information & communication | 2017 |
| I2DIGITAL Limited | Information & communication | 2017 |
| I2E-COMMS Ltd | Information & communication | 2017 |
| I2MEDIA Group Limited | Information & communication | 2017 |
| I2MEDIA Limited | Information & communication | 2005 |
| IA Growth Limited | Professional & scientific | 2018 |
| Iam-Sold Ltd | Real estate | 2009 |
| IAN Allan Building Contractors Limited | Wholesale & retail | 2005 |
| IAN Bell (Motor Cycles) Limited | Wholesale & retail | 1974 |
| IAN Brown Design Limited | Arts & recreation | 2002 |
| IAN Fairless Building Contractors Limited | Construction | 2014 |
| IAN Johnson Medical Services Limited | Health & social care | 2011 |
| IAN Kitching Building Services Ltd | Construction | 2020 |
| IAN Rowell Consultancy Ltd | Information & communication | 2006 |
| IAN Sutherland Consulting Ltd | Information & communication | 2008 |
| IAN Sutherland Property Ltd | Real estate | 2017 |
| IAN Swales Limited | Information & communication | 2016 |
| IAN Thompson Waste Recycling Ltd | Water & waste | 2024 |
| IAN Tierney Plumbing & Heating Ltd | Construction | 2016 |
| Iann Robert Clarke Ltd | Extraterritorial | 2025 |
| Iarchitect Limited | Professional & scientific | 2017 |
| Ibbu Kart Ltd | Wholesale & retail | 2024 |
| Ibex Electrical Limited | Construction | 2022 |
| IBK Medics Limited | Other services | 2021 |
| Ibni Ltd | Education | 2021 |
| IBR Quantity Surveying Limited | Professional & scientific | 2025 |
| Ibrahim and Yusuf Ltd | Health & social care | 2022 |
| IC Access Ltd | Manufacturing | 2022 |
| IC Planning Ltd | Professional & scientific | 2021 |
| IC Technologies Limited | Professional & scientific | 2009 |
| ICD Energy Managers Limited | Professional & scientific | 2021 |
| Icel Group Limited | Extraterritorial | 1977 |
| ICG (11) Limited | Extraterritorial | 2016 |
| ICG 16 Limited | Extraterritorial | 2021 |