| Hyde Properties Group Ltd | Real estate | 2023 |
| Hyde Yurts Ltd | Manufacturing | 2023 |
| Hydra-Capsule Limited | Manufacturing | 1987 |
| Hydra-Hire Ltd | Administrative & support | 2020 |
| Hydra-Property Group Ltd | Real estate | 2020 |
| I & N Franklin Ltd | Information & communication | 2012 |
| I D Holder Building Contractors Ltd | Construction | 2010 |
| I G Hackley Plant Hire Limited | Administrative & support | 2016 |
| I Jones Ltd | Information & communication | 2021 |
| I Jones Real Estate Ltd | Real estate | 2024 |
| I MOD Ltd | Wholesale & retail | 2018 |
| I'M Famous Ltd | Professional & scientific | 2013 |
| I-Study Limited | Education | 2014 |
| I-Touch Technologies Limited | Wholesale & retail | 2017 |
| I. & J.L. Brown Limited | Wholesale & retail | 1984 |
| I.J. Preece & SON Limited | Construction | 1996 |
| I2I (UK) Limited | Wholesale & retail | 2012 |
| I2I (UK) Property Holdings Limited | Real estate | 2022 |
| IAM INK PMU Ltd | Wholesale & retail | 2025 |
| IAN Jones Tyres Ltd. | Wholesale & retail | 1999 |
| IAN Walton Limited | Health & social care | 2016 |
| IAW Alchemy Ltd | Real estate | 2016 |
| IC Joseph Limited | Agriculture & fishing | 2007 |
| IC Orbit Ltd | Administrative & support | 2025 |
| Icarus Music Limited | Arts & recreation | 2014 |
| Iccr Investments Ltd | Real estate | 2018 |
| Ice Cream Heaven Ltd | Hospitality | 2017 |
| Ickle Group Ltd | Transport & logistics | 2021 |
| Iconic Brand Agency Limited | Professional & scientific | 2009 |
| ICP Connects Limited | Professional & scientific | 2024 |
| ID Shopfitting & Building (Hereford) Limited | Construction | 2014 |
| IDG Consultancy Limited | Extraterritorial | 2012 |
| Idle Graft Studio Ltd | Information & communication | 2022 |
| Igle Limited | Wholesale & retail | 2018 |
| Ikura Limited | Information & communication | 2009 |
| Illuvra Ltd | Professional & scientific | 2009 |
| ILS Consulting Limited | Professional & scientific | 2023 |
| Imagination Mappers Centre Limited | Professional & scientific | 2023 |
| IML Property Management Ltd | Real estate | 2020 |
| Immo Studio Limited | Professional & scientific | 2023 |
| Impact & Thrive Limited | Health & social care | 2022 |
| Impact Mortgages Ltd | Financial services | 2022 |
| Impactml Ltd | Information & communication | 2021 |
| Imperial Properties (Hereford) Limited | Real estate | 1971 |
| Import Furniture Depot Limited | Wholesale & retail | 2013 |
| Impress Hair & Beauty Ltd | Other services | 2019 |
| IMS Safety Consult Ltd | Professional & scientific | 2024 |
| IN the Booth Limited | Professional & scientific | 2015 |
| IN the Footsteps Tours Limited | Administrative & support | 2024 |
| Inanalytics Ltd | Information & communication | 2018 |
| Indicative Limited | Information & communication | 2025 |
| Indigo Bright Ltd | Professional & scientific | 2004 |
| Indigo Wood Hair and Beauty Limited | Other services | 2013 |
| Industrial Gases (UK) Limited | Wholesale & retail | 2003 |
| Inet Fire & Security Ltd | Administrative & support | 2024 |
| Inexplicable Games Limited | Information & communication | 2017 |
| Infinite Podiatry & Physio Limited | Health & social care | 2021 |
| Infinity 6 Limited | Professional & scientific | 2014 |
| Information Management & Oversight Ltd | Professional & scientific | 2021 |
| Infostruct Ltd | Professional & scientific | 2024 |
| Infrabee Infrastructure Partners Ltd | Energy | 2023 |
| Inmm UK Ltd | Information & communication | 2021 |
| Innevate Limited | Information & communication | 2013 |
| Innomet Engineering Limited | Professional & scientific | 2019 |
| Innovate Property Investments Limited | Financial services | 2022 |
| Inobuild Limited | Construction | 2016 |
| Insideout Electrical Services Ltd | Construction | 2026 |
| Insight Automotive Ltd | Information & communication | 2013 |
| Inspiral Limited | Professional & scientific | 2024 |
| Inspire Consulting and Coaching Limited | Professional & scientific | 2005 |
| Inspire Wealth Solutions Ltd | Financial services | 2010 |
| INSPIRE4BUSINESS Ltd | Professional & scientific | 2017 |
| Instruct IQ Ltd | Education | 2025 |
| Integrated Defence Limited | Administrative & support | 1988 |
| Intelliconsult Limited | Professional & scientific | 2017 |
| Interim Engineering Services Limited | Manufacturing | 2016 |
| International Online Ltd | Wholesale & retail | 2018 |
| International Solutions Limited | Administrative & support | 2006 |
| Investment Property Portfolio Ltd | Real estate | 2021 |
| Invictus Advisers Ltd | Professional & scientific | 2020 |
| Invictus Data Ltd | Information & communication | 2018 |
| IOH Trading Ltd | Real estate | 2020 |
| IPJ Ltd | Agriculture & fishing | 2023 |
| Irfonsh Limited | Financial services | 2024 |
| Iron Cipher Ltd | Administrative & support | 2025 |
| IRP Consultancy Limited | Professional & scientific | 2018 |
| IRTVYT1 Ltd | Real estate | 2026 |
| IRTVYT2 Ltd | Real estate | 2026 |
| IRTVYT3 Ltd | Real estate | 2026 |
| IRTVYT4 Ltd | Real estate | 2026 |
| IS Rental Limited | Real estate | 2023 |
| Isec Fire and Security Limited | Administrative & support | 2025 |
| ISHOP247 Ltd | Wholesale & retail | 2008 |
| ISR Records Ltd | Other services | 2002 |
| IT Happens Education Limited | Education | 2021 |
| IT Resolve Limited | Information & communication | 2014 |
| IT Takes 2 to Tandem Ltd | Administrative & support | 2021 |
| It's Thai Hereford Ltd | Hospitality | 2024 |
| ITC Natural Luxury Flooring Limited | Construction | 2018 |
| Itissin Ltd | Information & communication | 2008 |