| Ignispro Fire Safety Solutions Ltd | Financial services | 2025 |
| Illawalla Investments Ltd | Real estate | 2024 |
| Imel Limited | Wholesale & retail | 1996 |
| Imove EPC Ltd | Construction | 2024 |
| Imove Sales Ltd | Real estate | 2022 |
| IN Demand Marketing Limited | Professional & scientific | 2015 |
| IN the Zone PLF Limited | Professional & scientific | 2015 |
| Independent Site Supplies Ltd | Wholesale & retail | 2021 |
| Ingle's Dawndew Salad Limited | Agriculture & fishing | 1949 |
| Inglemere Metals (Blackpool) Limited | Water & waste | 2016 |
| Innitaris Ltd | Other services | 2016 |
| Insidelinehobbies Ltd | Wholesale & retail | 2019 |
| Inspired Riding Limited | Other services | 2015 |
| Inspired Weddings Limited | Other services | 2018 |
| Instawin Ltd | Wholesale & retail | 2025 |
| Interbuild (Poulton-Le-Fylde) Ltd | Construction | 2025 |
| Iona Blue Consulting Ltd | Information & communication | 2000 |
| IRT Plant Hire Limited | Administrative & support | 2012 |
| Iscreenman Ltd | Other services | 2021 |
| Isle of MAN Freight Ltd | Extraterritorial | 2006 |
| J Alderson Limited | Professional & scientific | 2003 |
| J C I (Northwest) Limited | Financial services | 2002 |
| J J Simpkin Ltd | Health & social care | 2021 |
| J Mellor Properties Limited | Real estate | 2021 |
| J T Bioletti Ltd | Transport & logistics | 2020 |
| J Varley & SON Limited | Construction | 2019 |
| J&Amc Ltd | Professional & scientific | 2020 |
| J&S Enterprises Limited | Education | 2014 |
| J. B. Masters Limited | Manufacturing | 1975 |
| J. Hull Plant Engineers Ltd | Manufacturing | 2022 |
| J.D. Mercer & Co Limited | Professional & scientific | 2010 |
| J.Hull Plant Hire Ltd | Administrative & support | 2024 |
| Jade Health Solutions Ltd | Health & social care | 2023 |
| JAE Lettings Ltd | Real estate | 2019 |
| Jane KAY Properties Ltd | Real estate | 2023 |
| Jason Parkinson Developments (Stanah) Ltd | Construction | 2016 |
| JBK Properties Ltd | Real estate | 2020 |
| JDS Developments Northwest Limited | Real estate | 2026 |
| Jenkinson Plant & Equipment Hire Ltd | Administrative & support | 2023 |
| Jenkinsons Game Farm Ltd | Agriculture & fishing | 2022 |
| Jeorge Coulthard Ltd | Extraterritorial | 2020 |
| Jimmy Love Limited | Arts & recreation | 2023 |
| Jimmy Noel Entertainment Ltd | Professional & scientific | 2024 |
| Jini Limited | Hospitality | 2022 |
| Jireh Training Services Ltd | Other services | 2011 |
| JJB Celebrity Management Ltd | Administrative & support | 2014 |
| JK Lettings (Fylde) Ltd | Real estate | 2021 |
| JKL Properties Blackpool Limited | Real estate | 2017 |
| Jlrtms Ltd | Construction | 2024 |
| JMC Software Solutions Ltd | Information & communication | 2023 |
| Joexplore Ltd | Information & communication | 2024 |
| John Stockell & Sons Limited | Construction | 2009 |
| Johnsons Accountancy Services Ltd | Professional & scientific | 2003 |
| JON Dixon Electrical Services Ltd | Mining & quarrying | 2012 |
| Jonathan Daniels & Co Limited | Real estate | 2025 |
| Jonathan Harrison Heating & Plumbing Ltd | Construction | 2020 |
| Joseridan Family Office Ltd | Financial services | 2019 |
| Joule Consultants Limited | Professional & scientific | 2002 |
| Jpkp Ltd | Financial services | 2021 |
| JR Singleton Limited | Construction | 2012 |
| JRT Installs Limited | Construction | 2025 |
| JS Projects (NW) Ltd | Construction | 2024 |
| Jselectrical Ltd | Construction | 2026 |
| Justin, Ritchie & Company Limited | Real estate | 1960 |
| Jwbs Group Limited | Financial services | 2019 |
| JWK Construction Services Ltd | Construction | 2020 |
| JWS Lettings Ltd | Real estate | 2020 |
| K9 Kampers Ltd | Administrative & support | 2026 |
| Kako the Barber Ltd | Other services | 2022 |
| Kalafatidi Lockhart Estates Ltd | Real estate | 2026 |
| Kaser Consulting Ltd | Administrative & support | 2023 |
| Katie Boyd Limited | Households | 2024 |
| Katie Upton Ltd | Professional & scientific | 2023 |
| Kawa Triple Parts Limited | Wholesale & retail | 2024 |
| KDM Roofing Ltd | Construction | 2025 |
| KEE Kee's Ltd | Hospitality | 2024 |
| Keja Property Lettings LLP | | 2020 |
| Kendal Fisheries Limited | Wholesale & retail | 1998 |
| Keos Vapes Ltd | Wholesale & retail | 2024 |
| Kerbel Electrical Ltd | Construction | 2026 |
| Key Land (UK) Ltd | Real estate | 2008 |
| Key Office Developments (Bispham) Ltd | Real estate | 2004 |
| Keyworker Homes (Cheshire) LLP | | 2011 |
| Keyworker Homes (Macclesfield Phase II) Limited | Administrative & support | 2012 |
| Keyworker Homes (Macclesfield) Limited | Real estate | 2008 |
| Keyworker Homes (Nantwich) Limited | Real estate | 2010 |
| Keyworker Homes (Newton Abbot) Limited | Real estate | 2010 |
| Keyworker Homes (Wales) Ltd | Extraterritorial | 2005 |
| Kilgour House Ltd | Real estate | 2020 |
| Kirkwood Youth Consultancy Limited | Extraterritorial | 2021 |
| KMS Hospitality Ltd | Professional & scientific | 2019 |
| Knight Rigging Services Limited | Administrative & support | 2004 |
| Knottend Golf Club Limited | Arts & recreation | 1949 |
| Knottend Workies Ltd | Hospitality | 2022 |
| Kokoi-Chawg Limited | Other services | 2026 |
| Kore Blackpool Limited | Other services | 2025 |
| Kore Lancaster Ltd | Arts & recreation | 2025 |
| Kore MAT Studio Limited | Other services | 2026 |
| Kore Reformer Pilates Ltd | Other services | 2025 |
| KRS Engineering Solutions Limited | Extraterritorial | 2018 |