| House of Colour by Kate Kelly Ltd | Other services | 2025 |
| House of Fish & Chips Ltd | Hospitality | 2026 |
| House of Nourisha Ltd | Hospitality | 2023 |
| Hover 1 Global Rentals Limited | Administrative & support | 2000 |
| Howard Orthopaedics Limited | Health & social care | 2021 |
| Howells Lettings Wirral Limited | Real estate | 2024 |
| Hoylake Gifts and Cards Ltd | Wholesale & retail | 2026 |
| Hurd Fitness Ltd | Arts & recreation | 2023 |
| Hwdwr Limited | Financial services | 2025 |
| Hybrid Wellness CIC | Education | 2022 |
| Hyde Park London Rentals Ltd | Real estate | 2026 |
| Hyena Holdings Ltd | Financial services | 2020 |
| Hyena Inc Limited | Construction | 2019 |
| HYF House Ltd | Transport & logistics | 2023 |
| Hyox Systems Limited | Health & social care | 2018 |
| Hype (Merseyside) Limited | Education | 2007 |
| Hype Associates Limited | Manufacturing | 1991 |
| Hyperbaric Treatment & Training Services Limited | Health & social care | 1995 |
| Hyt-Ability Limited | Other services | 2014 |
| Hytnerholdings Ltd | Construction | 2018 |
| I AM Impact Limited | Professional & scientific | 2018 |
| I&B Logistics Ltd | Manufacturing | 2025 |
| I. O. K. Engineering Ltd | Professional & scientific | 2021 |
| I.A Apartments Ltd | Administrative & support | 2024 |
| IAN Barclay Motor Repairs Limited | Wholesale & retail | 2014 |
| IB HGV Marketing Ltd | Professional & scientific | 2024 |
| IC Feature Films Ltd | Information & communication | 2013 |
| Icatcha Ltd | Other services | 2015 |
| Ice Creates Limited | Information & communication | 1999 |
| Iceberg Consulting Limited | Administrative & support | 2008 |
| Iconic Hair Limited | Other services | 2012 |
| Icore Infinity Limited | Arts & recreation | 2025 |
| ID 8 Pro Limited | Construction | 2023 |
| IDC Contracts Ltd | Professional & scientific | 2025 |
| IDS Heating Spares Ltd | Wholesale & retail | 2023 |
| IF Finishes North West Ltd | Construction | 2021 |
| IF Finishes NW Ltd | Real estate | 2024 |
| Ilieconstruct Ltd | Construction | 2026 |
| Ilove Multimedia Ltd | Education | 2019 |
| IM Consulting Ltd | Professional & scientific | 2024 |
| Impact Door Services Ltd | Manufacturing | 2022 |
| Inclusive Access (UK) Limited | Administrative & support | 1998 |
| Independent Ship Brokers Limited | Professional & scientific | 2000 |
| Indigo Services L2.1 Limited | Other services | 2020 |
| Indigo Venue Limited | Hospitality | 2022 |
| Industrial Fragrances (EOT) Ltd | Administrative & support | 2022 |
| Industrial Fragrances Ltd | Manufacturing | 2012 |
| Infinite Changes Ltd | Professional & scientific | 2021 |
| Infrastructure Project Partners Limited | Professional & scientific | 2011 |
| Infrastructure Storage and Logistics Ltd | Transport & logistics | 2024 |
| Infusiontech Systems Limited | Manufacturing | 2012 |
| Ingenio Rugged Technologies Limited | Professional & scientific | 2023 |
| Inglewood Services Limited | Professional & scientific | 2023 |
| Innovation Care Limited | Health & social care | 1997 |
| Innovation INK Limited | Professional & scientific | 2012 |
| Innovative Cocktails Ltd | Wholesale & retail | 2018 |
| Innovative PUB Company Ltd | Hospitality | 2019 |
| Inside OUT PD Limited | Construction | 2020 |
| Insite Architecture Limited | Professional & scientific | 2017 |
| Instore Shopfitters Limited | Construction | 2004 |
| Inteb Holdings Ltd | Financial services | 2024 |
| Inteb Managed Services Limited | Other services | 2013 |
| Integral Surface Designs Limited | Manufacturing | 2012 |
| Inter-Diocesan Fuel Management Limited | Wholesale & retail | 1994 |
| International Rigging and Lifting Services Ltd | Administrative & support | 2026 |
| International Superstore Ltd | Wholesale & retail | 2016 |
| Internet Know HOW Limited | Wholesale & retail | 2012 |
| Intuo Limited | Construction | 2024 |
| Invest-Wisely Ltd | Professional & scientific | 2005 |
| Invictus North West Ltd | Wholesale & retail | 2026 |
| Involve Northwest | Other services | 1996 |
| IOM Aerotech Limited | Manufacturing | 2016 |
| Ipfani Cocktails Ltd | Hospitality | 2023 |
| Ipsa International LLP | | 2025 |
| Irag Investment Company | Financial services | 2021 |
| Ireneusz Babol Transport Ltd. | Transport & logistics | 2013 |
| Iris B Capital Investments Limited | Financial services | 2023 |
| Iris Solutions Limited | Other services | 2018 |
| Isarad Ltd | Health & social care | 2022 |
| Island Power Services Ltd | Professional & scientific | 2022 |
| Isoline Ltd | Professional & scientific | 2012 |
| It's Taste That Matters Ltd | Education | 2011 |
| Itsabogslife Ltd | Professional & scientific | 2012 |
| Iuli and Anna Ltd | Wholesale & retail | 2025 |
| Izzah Holdings Limited | Hospitality | 2025 |
| J & H Waste and Scrap Ltd | Water & waste | 2026 |
| J D National Limited | Professional & scientific | 2019 |
| J J Management and Consultancy Limited | Construction | 2026 |
| J L Lewis Financial Services Ltd | Professional & scientific | 2016 |
| J Mccarthy Investments Ltd | Professional & scientific | 2022 |
| J P 1988 Limited | Administrative & support | 2014 |
| J S Williams Building Services Ltd | Construction | 2024 |
| J&D Hones LLP | | 2022 |
| J.Gordon Alison & Co | | 1900 |
| J.Shaw Electrical Engineers Limited | Construction | 1966 |
| J3X Properties Ltd | Real estate | 2026 |
| Jack LL Ltd | Wholesale & retail | 2025 |
| Jacobs Enforcement Limited | Administrative & support | 2024 |
| JAG Auto Service Ltd | Wholesale & retail | 2026 |
| Jagged Rock Investments Ltd | Construction | 2023 |