| HW Diagnostics Ltd | Manufacturing | 2018 |
| HW Grace House Ltd | Real estate | 2011 |
| HW Wolverhampton IT Services Limited | Information & communication | 2020 |
| HWD1 Ltd | Wholesale & retail | 2021 |
| Hy-Drive (Transport) Limited | | 1980 |
| Hybrid Education, Training & Consultancy Services Limited | Education | 2023 |
| Hybrid Minds Ltd | Administrative & support | 2019 |
| Hybridworld Ltd | Wholesale & retail | 2019 |
| Hyde and Sikh Limited | Real estate | 2026 |
| Hyderabadi Eatz Limited | Hospitality | 2025 |
| Hydes Convenience Store Limited | Wholesale & retail | 2015 |
| Hydrafit (Coventry) Limited | Manufacturing | 2008 |
| Hydrafit (Properties) Limited | Extraterritorial | 2008 |
| Hydrafit Limited | Extraterritorial | 2019 |
| Hydromaniac Ltd | Other services | 2012 |
| Hydron Protective Coatings Limited | Manufacturing | 2004 |
| Hydroponic Solutions Ltd | Wholesale & retail | 2025 |
| Hyett Education Ltd | Administrative & support | 2017 |
| Hygenia Ltd | Water & waste | 2022 |
| Hygenica Limited | Manufacturing | 2018 |
| Hygiea Pharma Ltd | Wholesale & retail | 2019 |
| Hypnoband International Limited | Health & social care | 2019 |
| I & C Motors Limited | Wholesale & retail | 2005 |
| I & D Dhadday Services Limited | Health & social care | 2011 |
| I Accountant 4U Ltd | Professional & scientific | 2025 |
| I and P Relna Ltd | Real estate | 2023 |
| I Callistus Consulting Ltd | Financial services | 2012 |
| I D V Travels Ltd | Transport & logistics | 2022 |
| I DO Coaching Limited | Education | 2024 |
| I Have Woman Power Ltd | Manufacturing | 2019 |
| I J R Homes Limited | Real estate | 2019 |
| I Need Staff Today Limited | Professional & scientific | 2018 |
| I Partner Global Limited | Hospitality | 2012 |
| I Tech Care Ltd | Manufacturing | 2019 |
| I TEQ Limited | Professional & scientific | 2008 |
| I&Ar Ltd | Transport & logistics | 2020 |
| I&B Services Ltd | Construction | 2015 |
| I'M Your P.A. Limited | Administrative & support | 2007 |
| I'M Your V.A. Limited | Administrative & support | 2026 |
| I-Coding Ltd | Information & communication | 2023 |
| I-Components Limited | Professional & scientific | 2011 |
| I-Konzult Ltd | Professional & scientific | 2025 |
| I-Provenance Ltd | Information & communication | 2023 |
| I-Reach Ltd | Real estate | 2019 |
| I.J.M. Fire Protection Systems Limited | Construction | 1988 |
| I.J.S Installations Ltd | Construction | 2013 |
| I.N. Company 0101 Ltd | Transport & logistics | 2025 |
| I.T. Transport Limited | Professional & scientific | 1979 |
| I/O Diagnostics Force Ltd | Professional & scientific | 2025 |
| I13 Group Ltd | Financial services | 2026 |
| I2LRESEARCH Ltd | Other services | 1994 |
| I54 Management Company Limited | Real estate | 2012 |
| I54 Properties Limited | Real estate | 2012 |
| I54 Western Extension Management Company Limited | Real estate | 2022 |
| IA Optics Properties Limited | Real estate | 2020 |
| IAH Construction Ltd | Construction | 2016 |
| Iahmuk Ltd | Wholesale & retail | 2026 |
| Iaka Services Ltd | Wholesale & retail | 2019 |
| IAN Lewis Bricklaying Services Ltd | Construction | 2018 |
| IAN Pearce Limited | Administrative & support | 2003 |
| IAN Priest Associates Limited | Financial services | 2011 |
| IAN Richmond Limited | Professional & scientific | 2004 |
| IAN Smith FES Consulting Limited | Education | 2022 |
| IAN Williams Logistics Ltd | Transport & logistics | 2022 |
| Ibby London Limited | Wholesale & retail | 2020 |
| Iberto Care & Support Ltd | Administrative & support | 2025 |
| Ibin Innovations Limited | Wholesale & retail | 2011 |
| Ibin Medical Limited | Extraterritorial | 2015 |
| Ibiotech Ltd | Professional & scientific | 2021 |
| IBJ Construct Ltd | Construction | 2025 |
| IBM Records Ltd | Information & communication | 2026 |
| Ibo's Services Limited | Wholesale & retail | 2021 |
| IBR Properties Ltd | Real estate | 2024 |
| IBR Services Ltd | Professional & scientific | 2023 |
| IBT Records Ltd | Arts & recreation | 2019 |
| Icanfix Ltd | Wholesale & retail | 2022 |
| ICC (Eight) Limited | Professional & scientific | 1997 |
| ICC (Five) Limited | Professional & scientific | 1997 |
| ICC (Four) Limited | Professional & scientific | 1997 |
| ICC (Nine) Limited | Professional & scientific | 1997 |
| ICC (SIX) Limited | Professional & scientific | 1997 |
| ICC (Three) Limited | Professional & scientific | 1997 |
| Icclen Ltd | Administrative & support | 2026 |
| Iced Entertainment Ltd | Arts & recreation | 2026 |
| Iceni Limited | Professional & scientific | 1998 |
| Icentrum Properties Limited | Real estate | 2017 |
| Icke&Sons Ltd | Professional & scientific | 2025 |
| Icknield Properties(Birmingham)Limited | Real estate | 1950 |
| Icleanz Cleaning Delivery Servicez Ltd | Administrative & support | 2024 |
| Icmj Developments Ltd | Information & communication | 2020 |
| Icommunix Limited | Information & communication | 2017 |
| Icon Pro Heating and GAS Services Ltd | Construction | 2023 |
| Icon Signature Limited | Wholesale & retail | 2024 |
| Iconic Sports Ltd | Wholesale & retail | 2011 |
| ICS IT Services Ltd | Information & communication | 2024 |
| Icymo Ltd | Wholesale & retail | 2019 |
| ID Iacob Transport Ltd | Transport & logistics | 2024 |
| ID Storage Warehouse Ltd | Wholesale & retail | 2017 |
| IDC Mortgage and Protection Limited | Administrative & support | 2018 |
| Idea LT Limited | Wholesale & retail | 2018 |