| Hunter Falcon Farm Limited | Agriculture & fishing | 2021 |
| Hunter Haulage Ltd | Transport & logistics | 2014 |
| Hunter Rainn Ltd | Water & waste | 2022 |
| Hunters Plant Limited | Administrative & support | 2017 |
| Huntress Personal Training Ltd | Arts & recreation | 2024 |
| Hunts Cross D C Limited | Health & social care | 2008 |
| Huntstar Trading Ltd | Wholesale & retail | 2006 |
| Hurst Bros. (Produce Merchants) Limited | Wholesale & retail | 1981 |
| Husk Agency Limited | Information & communication | 2022 |
| Hutchinson IP Ltd | Professional & scientific | 2011 |
| HW Commercial Property Ltd | Real estate | 2017 |
| Hwan-Yeong Limited | Other services | 2023 |
| HXH 866 Ltd | Hospitality | 2024 |
| Hyde Drycleaners Ltd | Wholesale & retail | 2018 |
| Hyde Technologies Ltd | Wholesale & retail | 2019 |
| Hydroflux Limited | Water & waste | 2014 |
| Hyperbaric & Tunnel Safety Limited | Administrative & support | 2010 |
| Hyperdrive AI Ltd | Information & communication | 2024 |
| Hypnotherapy North West Ltd | Health & social care | 2017 |
| I & M Mckean & Sons Limited | Administrative & support | 2012 |
| I Glover Limited | Professional & scientific | 2013 |
| I SEE Ltd | Construction | 2020 |
| I SEE YOU Online Limited | Professional & scientific | 2015 |
| I Sky Medical Limited | Health & social care | 2019 |
| I-Clarity Solutions Ltd | Financial services | 2022 |
| I. Samonek Plumbing Solutions Ltd | Construction | 2017 |
| I86PROPERTIES Limited | Construction | 2020 |
| IA Medical Services Limited | Health & social care | 2022 |
| IA Residential Services Limited | Real estate | 2025 |
| Iain Jack Photography Limited | Professional & scientific | 2013 |
| IAK Financial Consultancy Ltd | Administrative & support | 2015 |
| IAN Rylands Limited | Construction | 2001 |
| Ibex Performance Limited | Extraterritorial | 2025 |
| Icandy Marketing Ltd | Professional & scientific | 2020 |
| Ice Active Ltd | Arts & recreation | 2021 |
| Iceni Bloodstock Limited | Arts & recreation | 2024 |
| Icosmetics Aesthetics Ltd | Other services | 2025 |
| Icracktech Limited | Wholesale & retail | 2022 |
| ID Clinica Health and Wellness Ltd | Wholesale & retail | 2025 |
| ID Clinica Professional Ltd | Health & social care | 2019 |
| Idata Destruction Ltd | Water & waste | 2008 |
| Ideal Living Homes Limited | Real estate | 2017 |
| Ideal Property Holdings Ltd | Real estate | 2017 |
| Identity Dads CIC | Health & social care | 2024 |
| Idjuk Limited | Professional & scientific | 2025 |
| Idriveuk Ltd | Transport & logistics | 2025 |
| Ifix Europe Limited | Manufacturing | 2013 |
| Ifixsmash Southport Limited | Wholesale & retail | 2025 |
| IGE Support Ltd | Professional & scientific | 2023 |
| Ignite Group Strategies Ltd | Professional & scientific | 2022 |
| Iguana Events Limited | Arts & recreation | 2020 |
| IJH Windows and Doors Limited | Manufacturing | 2026 |
| Ikigai LET Ltd | Real estate | 2024 |
| IL4EVER Ltd | Other services | 2024 |
| Ilaborate Limited | Professional & scientific | 2015 |
| Illumidex Lighting Company Ltd | Wholesale & retail | 2021 |
| Illumidex UK Ltd | Construction | 2019 |
| Illuminate Education Services UK Ltd | Education | 2019 |
| Image Surveys Limited | Professional & scientific | 2023 |
| Imagination Station Southport Limited | Health & social care | 2024 |
| IMB Accountants Limited | Professional & scientific | 2013 |
| Immersive Medical Ltd | Professional & scientific | 2021 |
| Immersive Technology Ltd | Water & waste | 2021 |
| Impact Assessments Limited | Administrative & support | 2018 |
| Imperial Garage (Southport) Limited | Administrative & support | 2014 |
| Imperial Gym Ltd | Arts & recreation | 2026 |
| IMS UK Consulting Ltd | Professional & scientific | 2013 |
| Imts-Uk Ltd | Manufacturing | 2020 |
| IN DEN Engel Limited | Hospitality | 2024 |
| IN Leisure Limited | Arts & recreation | 2017 |
| In-Depth Building Consultants Ltd | Construction | 2025 |
| In-House-Lawyer (Services) Ltd | Professional & scientific | 2017 |
| Ince Blundell Nurseries Limited | Wholesale & retail | 2005 |
| Inception Developments Ltd | Construction | 2019 |
| Independent Advocate Services Limited | Professional & scientific | 2025 |
| Independent Hotels Limited | Real estate | 2018 |
| Indexdream Limited | Hospitality | 2026 |
| Indian Divine Ltd | Hospitality | 2019 |
| Indigo 1919 Limited | Financial services | 2025 |
| Industrial Abseilers Limited | Construction | 2024 |
| Industrial Services (N W) Limited | Manufacturing | 2000 |
| Infinelec Limited | Construction | 2023 |
| Infinite Graphics Solutions Ltd | Information & communication | 2017 |
| Infinite PV Ltd | Construction | 2024 |
| Infinitis Business Consultants Ltd | Professional & scientific | 2005 |
| Infinity Joinery Services Ltd | Construction | 2024 |
| Infinity Payments Ltd | Financial services | 2021 |
| Inflata Beverley Limited | Arts & recreation | 2018 |
| Inflata Bromborough Limited | Arts & recreation | 2024 |
| Inflata Hull Limited | Arts & recreation | 2023 |
| Inflata Nation Ipswich Limited | Arts & recreation | 2022 |
| Inflata Southport Limited | Arts & recreation | 2024 |
| Inflata Telford Limited | Arts & recreation | 2022 |
| Ingenious Media Solutions Ltd | Professional & scientific | 2012 |
| Inglis Advisory Board Ltd | Professional & scientific | 2023 |
| Initium Engineered Solutions Limited | Professional & scientific | 2024 |
| INM & MC Properties Ltd | Real estate | 2013 |
| Inm&Mzh Properties Limited | Real estate | 2017 |
| Innovationkb Limited | Construction | 2019 |
| Innovative Intervention Global Limited | Manufacturing | 2025 |