| House of Love Couture Ltd | Wholesale & retail | 2018 |
| HOW 2 Training Limited | Extraterritorial | 2020 |
| Howden Transport Limited | Transport & logistics | 2025 |
| HPA Property Ltd | Real estate | 2023 |
| HPF Supplies Ltd | Wholesale & retail | 2025 |
| HS Haven Ltd | Real estate | 2026 |
| HTD Distributions Limited | Wholesale & retail | 2025 |
| Human Interactions Limited | Professional & scientific | 2004 |
| Huntscross Fish Bar Ltd | Hospitality | 2021 |
| HUS Solutions Ltd | Construction | 2023 |
| Hvec Limited | Professional & scientific | 2019 |
| Hybrid Golf Ltd | Other services | 2012 |
| Hydraflow Limited | Other services | 2021 |
| Hydraulic Mobile Services (Merseyside) Limited | Manufacturing | 1978 |
| Hydro-Gen Engineering Ltd | Manufacturing | 2011 |
| I & a Radiology Ltd | Health & social care | 2014 |
| I & B Brickwork Limited | Construction | 2019 |
| I DO Events Group Ltd | Administrative & support | 2021 |
| I DO Events Liverpool Limited | Administrative & support | 2019 |
| I&M Couriers Ltd | Transport & logistics | 2023 |
| I.I.E.S. (Northern) Limited | Water & waste | 1985 |
| IAN Cheveau Marketing Consultancy Ltd | Professional & scientific | 2023 |
| IAN Fletcher Land & Development Services Limited | Administrative & support | 2018 |
| IAN Glorman Management Consultancy Limited | Professional & scientific | 2016 |
| IAN Leggett & Co Ltd | Professional & scientific | 2008 |
| Icey Van Limited | Hospitality | 2026 |
| Iconichem Widnes Limited | Manufacturing | 2015 |
| ICS Property Management Services Limited | Other services | 2015 |
| IDC Lifting Services Limited | Manufacturing | 2008 |
| Ideal Sealants Limited | Wholesale & retail | 2002 |
| IDT Management Ltd | Financial services | 2022 |
| IDT Newco Limited | Professional & scientific | 2020 |
| IFG Telecoms Ltd | Information & communication | 2024 |
| IGH Property Holdings Ltd | Real estate | 2022 |
| Ignite Excellence Limited | Professional & scientific | 2025 |
| IHS Property Ltd | Construction | 2022 |
| IJS Building Services Limited | Other services | 2013 |
| ILUMEN8 Ltd | Administrative & support | 2024 |
| Impact Automotive Repair Specialist Ltd | Wholesale & retail | 2026 |
| Imperial Tankers Limited | Professional & scientific | 2004 |
| Impero Enterprises Ltd | Other services | 2021 |
| Imprimo Group Limited | Wholesale & retail | 2020 |
| Inclusivitee CIC | Education | 2023 |
| Independent Audio Sales Limited | Professional & scientific | 2025 |
| Independent Tyre Consultants Ltd | Manufacturing | 2004 |
| Indigo Site Consultants Ltd | Administrative & support | 2018 |
| Industrial Services (East Anglia) Limited | Wholesale & retail | 2002 |
| Industrial Water Filters Ltd | Manufacturing | 2020 |
| Industrial Welding Solutions Ltd | Professional & scientific | 2026 |
| Industry Access Ltd | Education | 2025 |
| Infinite Interiors Ltd | Construction | 2017 |
| Infitex Energy Solutions Limited | Professional & scientific | 2024 |
| Ingle TEC Limited | Information & communication | 2026 |
| Inn @ Ness PUB & Kitchen Ltd | Hospitality | 2014 |
| Innavision Group Ltd | Real estate | 2013 |
| Innovative Quality Management Ltd | Professional & scientific | 2013 |
| Innovative Safety Solutions Limited | Professional & scientific | 2002 |
| Insight Foundation CIC | Professional & scientific | 2025 |
| Insight Learning Specialists Limited | Professional & scientific | 2023 |
| Inspired Hair by Amy-Lee Ltd | Other services | 2024 |
| Inspired Property Group NW Ltd | Real estate | 2024 |
| Instrument Consultants Ltd | Professional & scientific | 2023 |
| Instrument Design Technology Limited | Professional & scientific | 2000 |
| Interim Engineering Managment Limited | Professional & scientific | 2017 |
| Interscaff Holdings Ltd | Professional & scientific | 2019 |
| Intertape Packaging UK Limited | Manufacturing | 2021 |
| Inveniam Group Ltd | Construction | 2023 |
| Ioana-Roberta Ltd | Transport & logistics | 2018 |
| Iris Networks Limited | Information & communication | 2011 |
| Iron Wolf Security Limited | Administrative & support | 2023 |
| Irving Assets Ltd | Real estate | 2025 |
| Istanbul Restaurant Widnes Ltd | Hospitality | 2026 |
| Isupply Finance Ltd | Financial services | 2019 |
| IT Figures (Accountancy Services) Limited | Professional & scientific | 2001 |
| It's the Leash WE CAN DO Ltd | Agriculture & fishing | 2024 |
| Ithal Ethnic Wear Ltd | Wholesale & retail | 2026 |
| J & B Properties Panama Ltd | Real estate | 2018 |
| J B Rewinds Limited | Manufacturing | 2000 |
| J C L C Promotions Limited | Administrative & support | 2008 |
| J Fraser Ltd | Transport & logistics | 2023 |
| J Holdings Ltd | Financial services | 2024 |
| J Logistics Limited | Transport & logistics | 2013 |
| J P Properties 1999 Limited | Real estate | 1993 |
| J W M Promotions Limited | Professional & scientific | 1995 |
| J Wilson Engineering Ltd | Manufacturing | 2014 |
| J Y D Couriers Limited | Transport & logistics | 2015 |
| J&Jrs Limited | Wholesale & retail | 2021 |
| J&M Rigging Services Limited | Information & communication | 2019 |
| J.E. Richardson Services Ltd | Professional & scientific | 2019 |
| J.E.M Electrical U.K Ltd | Construction | 2016 |
| J.G Fitters Ltd | Wholesale & retail | 2024 |
| J.S.R. Transport Solutions Ltd | Transport & logistics | 2006 |
| Jaba Simm Limited | Financial services | 2024 |
| Jack Ikin (UK) Ltd | Other services | 2016 |
| Jackson Aircraft Engineering Ltd | Manufacturing | 2013 |
| JAF Group Holdings Limited | Financial services | 2024 |
| JAF Holdings Limited | Financial services | 2024 |
| JAK Properties (Widnes) Ltd | Real estate | 2022 |
| Jakc Ltd | Administrative & support | 2019 |
| Jamal Nice Style Ltd | Other services | 2024 |