| IQ Verify Holdings Ltd | Education | 2016 |
| IQN Ltd | Education | 2025 |
| Irby Cottage Properties Ltd | Real estate | 2026 |
| Irby Mill Ltd | Hospitality | 2011 |
| Irby Motor Company Limited | Wholesale & retail | 1999 |
| Iria Flavia Ltd | Financial services | 2022 |
| IRK Consulting Ltd | Professional & scientific | 2025 |
| Irut Limited | Health & social care | 2011 |
| Irvine Maritime Ltd | Transport & logistics | 2012 |
| Irving & Irving PH Ltd | Hospitality | 2016 |
| Isabelle Harvey Ltd | Real estate | 2025 |
| Isabelles (Heswall) Limited | Hospitality | 2026 |
| Isitchecked 2 Ltd | Information & communication | 2019 |
| Isitchecked Limited | Information & communication | 2017 |
| ISJ Properties Ltd | Real estate | 2026 |
| Island Court Management Company Limited | Households | 1994 |
| Island Electrical Engineering Limited | Construction | 2002 |
| ISO Bilo Ltd | Hospitality | 2021 |
| Isw-Assessments Ltd | Health & social care | 2019 |
| Italia Luxury Property Ltd | Real estate | 2018 |
| Italian Financial Logistic and Trading Services Ltd | Administrative & support | 2018 |
| Ithaca (UK) Ltd | Information & communication | 2011 |
| ITL Omega Ltd | Transport & logistics | 2019 |
| Ives N Limited | Wholesale & retail | 2012 |
| Ivorway Limited | Other services | 1996 |
| IVY Boarding Kennels and Cattery Limited | Other services | 2016 |
| IVY Events Ltd | Administrative & support | 2023 |
| IVY KC Property Developments Ltd. | Real estate | 2019 |
| Ivyhurst Limited | Households | 2021 |
| Ivyhurst Manor Limited | Households | 2021 |
| Ivyhurst Property Limited | Households | 2021 |
| Iyers Medical Limited | Health & social care | 2024 |
| Izzy Swin Limited | Health & social care | 2025 |
| J & D Marsh Groundworks Ltd | Construction | 2019 |
| J & J L Simons Limited | Real estate | 2013 |
| J & L Painting and Decorating Ltd | Construction | 2024 |
| J & L Supplies Limited | Wholesale & retail | 2001 |
| J & M Profile Joinery Limited | Construction | 1982 |
| J & R Maddyson Limited | Health & social care | 2020 |
| J Archer Limited | Transport & logistics | 2024 |
| J Beck Equestrian Training Limited | Arts & recreation | 2010 |
| J Bird Distribution Limited | Transport & logistics | 2025 |
| J Birks Building Services North West Ltd | Construction | 2019 |
| J C Property Solutions (Wirral) Limited | Construction | 2016 |
| J D Electrical Services Greasby Limited | Construction | 2023 |
| J D Electrical Services Heswall Limited | Construction | 2023 |
| J Davies Construction Limited | Construction | 2022 |
| J Davies Property Ltd | Real estate | 2022 |
| J E Broster & SON Limited | Agriculture & fishing | 2017 |
| J E D Technical Services Ltd | Professional & scientific | 2007 |
| J E Mackinnon Limited | Wholesale & retail | 2026 |
| J F Heating Engineers Limited | Construction | 2017 |
| J F Lease Advisory Limited | Other services | 2020 |
| J H L Distribution Ltd | Wholesale & retail | 2015 |
| J M King Limited | Wholesale & retail | 2012 |
| J M Property Management Support Ltd | Real estate | 2022 |
| J Miles Services Limited | Construction | 2018 |
| J Nelson Architectural Design Ltd | Professional & scientific | 2013 |
| J Q & Sons Ltd | Real estate | 2026 |
| J R B Express Limited | Construction | 2013 |
| J R Humphrey (Painting and Decorating Contractors) Limited | Construction | 2009 |
| J Stewart Financial Ltd | Professional & scientific | 2017 |
| J Williams Properties Ltd | Real estate | 2023 |
| J Williams Trading Ltd | Professional & scientific | 2024 |
| J&I Electrical Services Limited | Other services | 2017 |
| J&J Treehouse Limited | Real estate | 2020 |
| J&K Property Solutions Ltd | Real estate | 2018 |
| J.A.D. Direct Ltd | Health & social care | 2009 |
| J.C.M. Customs Limited | Manufacturing | 2014 |
| J.D. Hughes Limited | Construction | 2002 |
| J.E. Property Developments Limited | Real estate | 1999 |
| J.E. Robinson Engineering Limited | Professional & scientific | 1976 |
| J.E.T. Properties NW Limited | Real estate | 2021 |
| J.L. Leadwell Limited | Professional & scientific | 2020 |
| J.R.S Engineering Services Ltd | Professional & scientific | 2019 |
| J.Stuart & Co.(Garages)Limited | Wholesale & retail | 1965 |
| J12 Property Limited | Real estate | 2025 |
| Jabh Properties Ltd | Real estate | 2025 |
| Jaboc Interiors Limited | Professional & scientific | 2019 |
| Jack Lang Ltd | Professional & scientific | 2022 |
| Jack Neil Media Services Ltd. | Professional & scientific | 2021 |
| Jackie's Desk Ltd | Administrative & support | 2025 |
| Jackson Performance Services Ltd | Wholesale & retail | 2021 |
| Jacs Properties Ltd | Real estate | 2014 |
| JAE Inspection Services Limited | Administrative & support | 2010 |
| Jafs Engineering Ltd | Professional & scientific | 2017 |
| Jaguar Universe Ltd | Wholesale & retail | 2023 |
| Jaguarcafe Limited | Hospitality | 2002 |
| Jaguarconstructionandoutdoorservices Ltd | Construction | 2024 |
| JAH Projects Limited | Professional & scientific | 2009 |
| JAJ Advisory Services Limited | Professional & scientific | 2022 |
| Jake Morgan Consultancy Limited | Professional & scientific | 2010 |
| Jakes Village News Limited | Wholesale & retail | 2025 |
| JAM Padel Ltd | Arts & recreation | 2025 |
| Jamdane (Merseyside) Ltd | Hospitality | 2019 |
| James Culverhouse Communications Ltd | Professional & scientific | 2025 |
| James Ellis Family Investments Ltd | Financial services | 2019 |
| James Farrell Ltd | Transport & logistics | 2025 |
| James Mace Trading Ltd | Wholesale & retail | 2024 |
| James Michael Properties Ltd | Households | 2024 |