| Innovative Joinery & Building Company Ltd | Construction | 2026 |
| Innovise Group Ltd | Administrative & support | 2024 |
| Insight Chemical Solutions Limited | Manufacturing | 2007 |
| Inspired by Claire Ltd | Professional & scientific | 2025 |
| Inspired Money Ltd | Extraterritorial | 2014 |
| Instruction SET Limited | Professional & scientific | 2021 |
| Integral Protection International Ltd | Administrative & support | 2019 |
| Integral Protection Ltd | Administrative & support | 2016 |
| Intelinext Ltd | Information & communication | 2023 |
| Intelligent Distribution Ltd | Financial services | 2020 |
| Intellivise Limited | Information & communication | 2011 |
| Intensity Sports Events Ltd | Arts & recreation | 2026 |
| Intensity Sports Performance Ltd | Arts & recreation | 2023 |
| Interactive Computer Aided Learning Ltd | Information & communication | 1996 |
| Internal Management Consultants Limited | Construction | 2008 |
| International Digital Business Solutions Limited | Professional & scientific | 2019 |
| Intral Limited | Professional & scientific | 2004 |
| Introduced Dating Ltd | Information & communication | 2026 |
| Investment Capitol Limited | Real estate | 2022 |
| Invisible Ventures Ltd | Information & communication | 2023 |
| Invxst Ltd | Real estate | 2021 |
| IOJ Properties Ltd | Real estate | 2025 |
| Ipanda Online Shops Ltd | Administrative & support | 2025 |
| IPD Building & Maintenance Ltd | Construction | 2025 |
| IPS Costs Law Limited | Professional & scientific | 2005 |
| IPX Telecom Limited | Information & communication | 2005 |
| IR Property Solutions Ltd | Real estate | 2020 |
| Iride Global Limited | Administrative & support | 2003 |
| Irish House Southport Ltd | Hospitality | 2026 |
| Irish One Ltd | Hospitality | 2024 |
| Ironshore Global Limited | Real estate | 2016 |
| Irvine Investment Management Ltd | Financial services | 2014 |
| Isight Logistics Ltd | Health & social care | 2023 |
| Istanbul Barber NO1 Shop Limited | Other services | 2016 |
| Istanbul Barber Shop NO 3 Limited | Other services | 2020 |
| Isurgicals Limited | Manufacturing | 2005 |
| IT Assist NOW Limited | Professional & scientific | 2003 |
| IT Sense Ltd | Information & communication | 2021 |
| Italian Street Food Southport Limited | Hospitality | 2024 |
| Italiano Stucco Limited | Manufacturing | 2016 |
| ITP Packaging Ltd | Manufacturing | 2013 |
| ITS Joinery Ltd | Construction | 2024 |
| Ivie Properties Limited | Real estate | 2022 |
| IVY House Group Ltd | Real estate | 2021 |
| Izzy Mini Mart Ltd | Wholesale & retail | 2024 |
| J & E.Furnishings (Southport) Limited | Real estate | 1962 |
| J & J Associates (North West) Limited | Real estate | 1999 |
| J & J Turner Ltd | Construction | 2015 |
| J & K Nursery`S Ltd | Education | 2006 |
| J & L Lettings Northwest Ltd | Construction | 2026 |
| J & M Steel Stockholders Limited | Manufacturing | 2002 |
| J & P Estates Lytham Ltd | Real estate | 2023 |
| J Clegg Heating Limited | Construction | 2022 |
| J D a Real Estate Limited | Real estate | 2020 |
| J Donaldson Properties Ltd | Real estate | 2024 |
| J Garrow Heating & Plumbing Ltd | Construction | 2023 |
| J Glasgow Property & Roofing Services Ltd | Construction | 2018 |
| J Halsall & Sons Ltd | Water & waste | 2012 |
| J J LIM Limited | Real estate | 2016 |
| J James Donaldson Properties LLP | | 2018 |
| J Jerram Construction Ltd | Construction | 2021 |
| J M Blaynee Research Design Ltd | Information & communication | 2019 |
| J Resi One Ltd | Construction | 2025 |
| J S Consultants (Southport) Ltd | Financial services | 2006 |
| J T Joinery Ltd | Construction | 2013 |
| J Whittle Consulting Ltd | Professional & scientific | 2019 |
| J&G Longton Properties Limited | Real estate | 2002 |
| J&L Lets Ltd | Real estate | 2023 |
| J&N Commercials Ltd | Construction | 2025 |
| J&W Investment Group Ltd | Real estate | 2020 |
| J. Brolly Roofing Ltd | Construction | 2025 |
| J. M. W. Resources Limited | Wholesale & retail | 2004 |
| J.B. Financial Solutions Limited | Administrative & support | 2006 |
| J.M.R. Aesthetics Ltd | Other services | 2019 |
| J.P. Lucas & Company Limited | Extraterritorial | 1947 |
| J.P.L Construction & Maintenance NW Ltd | Construction | 2017 |
| J.P.R Plumbing & Heating Limited | Construction | 2014 |
| J.S.I. Holdings Limited | Financial services | 2005 |
| J.W.Leivesley & Co.,Limited | Wholesale & retail | 1921 |
| JA Cain Roofing Ltd | Construction | 2021 |
| Jaar Properties Limited | Real estate | 2020 |
| Jabran Limited | Professional & scientific | 2013 |
| Jac's News Ltd | Wholesale & retail | 2021 |
| Jacans Ltd | Wholesale & retail | 2016 |
| Jack & Anna Ltd | Administrative & support | 2002 |
| Jack & GIN Ltd | Construction | 2016 |
| Jack Ikin Retail UK Ltd | Professional & scientific | 2021 |
| Jack of ALL Trades (North West) Limited | Other services | 2015 |
| Jack Parker Coffee Ltd | Hospitality | 2024 |
| Jackman Gym Ltd | Arts & recreation | 2025 |
| Jackson Electrotechnical Ltd | Manufacturing | 2014 |
| Jackson Property Services Ltd | Construction | 2022 |
| Jacksonsfishandchips Limited | Hospitality | 2024 |
| Jacob's Polish Bakery Ltd | Wholesale & retail | 2025 |
| JAD Legal Consultancy Services Limited | Professional & scientific | 2024 |
| Jade Gardens Chinese Restaurant Ltd | Hospitality | 2025 |
| Jade I.T Services Limited | Administrative & support | 2007 |
| Jaeger Estates Ltd | Real estate | 2022 |
| Jaeger Stays Ltd | Real estate | 2024 |
| Jaff Barber Limited | Other services | 2023 |