| Insularcode Ltd | Information & communication | 2024 |
| Insurance Connections (Brokers) UK Ltd | Financial services | 2011 |
| Integer International Limited | Professional & scientific | 2018 |
| Integral Finance Limited | Professional & scientific | 2012 |
| Integral Pharma Services Limited | Professional & scientific | 2002 |
| Integrity Enterprises (Cheshire) Ltd | Other services | 2014 |
| Integument Solutions Limited | Real estate | 2018 |
| Intellicore Solutions Ltd | Information & communication | 2024 |
| Intellifusion Media Ltd | Information & communication | 2024 |
| Interim Gateway Limited | Professional & scientific | 2024 |
| Intermarkets Trading Ltd | Education | 2025 |
| Interworks Limited | Information & communication | 1995 |
| Invertase Holdings Limited | Financial services | 2018 |
| Invertase Limited | Information & communication | 2017 |
| Invictus Security Solutions Limited | Administrative & support | 2025 |
| Ionut&Lary Ltd | Transport & logistics | 2023 |
| Iphysiotherapy Ltd | Health & social care | 2026 |
| Iron & Grace Consulting Ltd | Extraterritorial | 2025 |
| Irwin Plant and Equipment Services Ltd | Administrative & support | 1998 |
| Isabel Bassett Ltd | Arts & recreation | 2023 |
| Isolab Industrial Limited | Professional & scientific | 2021 |
| Isolab Scientific Limited | Manufacturing | 2023 |
| Istanbul Restaurant Cheshire Ltd | Hospitality | 2026 |
| Istanbul Restaurant Crewe Ltd | Hospitality | 2024 |
| ITIS2 Limited | Professional & scientific | 2003 |
| Itopro Ltd | Information & communication | 2026 |
| Iview Radiography Solutions Ltd | Health & social care | 2023 |
| Ivydene (Betley) Management Company Limited | Households | 2017 |
| Iwanta Network Ltd | Extraterritorial | 2013 |
| IZO Bella Ltd | Construction | 2026 |
| J & J Holdings (Crewe) Limited | Financial services | 2020 |
| J & S Investments Limited | Other services | 2021 |
| J a C Hospitality Limited | Hospitality | 2017 |
| J Bowler Engineering Ltd | Professional & scientific | 2024 |
| J Brown the Hot TUB Engineer Ltd | Wholesale & retail | 2020 |
| J Frizell Agri Ltd | Wholesale & retail | 2024 |
| J Hall Investments Limited | Administrative & support | 2025 |
| J Leech & Co Limited | Transport & logistics | 2012 |
| J M Prescott & Co Ltd | Professional & scientific | 2013 |
| J Maclellan Services Limited | Professional & scientific | 2010 |
| J Mitchell Design Ltd | Wholesale & retail | 2026 |
| J N Bricklayers & Builders Ltd | Construction | 2022 |
| J N L Joinery Services Limited | Construction | 2018 |
| J P Limited | Information & communication | 2000 |
| J P Morriss Assessors Limited | Other services | 2004 |
| J S Giblin Ltd | Households | 2023 |
| J Skeffington Racing Limited | Arts & recreation | 2026 |
| J Stoneley Plumbing & Heating Ltd | Construction | 2023 |
| J Taylor Paint & Body Ltd | Wholesale & retail | 2024 |
| J Track Isolations Limited | Professional & scientific | 2015 |
| J W Wilson Plumbing & Heating Limited | Construction | 2015 |
| J West Building Services Limited | Construction | 2020 |
| J&A Roberts Properties Ltd | Real estate | 2024 |
| J&C Property Solutions Ltd | Real estate | 2020 |
| J&H Carpets Limited | Wholesale & retail | 2026 |
| J&L Mayor Limited | Professional & scientific | 2023 |
| J&N Boutique Limited | Wholesale & retail | 2025 |
| J&N Jewellery Ltd | Wholesale & retail | 2023 |
| J-Tech Renewables Ltd | Construction | 2024 |
| J. John Limited | Administrative & support | 2017 |
| J.B. Computing Technology Limited | Information & communication | 1999 |
| J.Clarkrail Ltd | Construction | 2017 |
| J.Daniel Logistic Ltd | Transport & logistics | 2023 |
| J.F. Properties Limited | Construction | 1995 |
| J.Keeling Ltd | Transport & logistics | 2025 |
| Jack Gill Ltd | Information & communication | 2022 |
| Jack MAY Properties Limited | Real estate | 2025 |
| Jackr Trans Ltd | Transport & logistics | 2018 |
| Jackson Gate Farm Ltd | Hospitality | 2022 |
| Jacobs Pizza Ltd | Hospitality | 2023 |
| Jadco Ventures Limited | Other services | 2025 |
| Jadeitehker Ltd | Wholesale & retail | 2024 |
| Jaff Studios Ltd | Other services | 2025 |
| JAL Medical Aesthetics Ltd | Other services | 2026 |
| Jalfrezi (Homles Chapel) Limited | Hospitality | 2024 |
| JAM Risk Solutions Limited | Professional & scientific | 2025 |
| Jamaica Judo Limited | Professional & scientific | 2025 |
| Jambusters Limited | Information & communication | 2001 |
| James Barber Properties Limited | Real estate | 2026 |
| James Boulton Services Ltd | Agriculture & fishing | 2021 |
| James Specialist Veterinary Cardiology Ltd | Professional & scientific | 2017 |
| James Street (Stoke) Management Company Limited | Real estate | 2007 |
| Jammra Ltd | Construction | 2018 |
| Jams Ventures Limited | Financial services | 2024 |
| JAN Constantine (UK) Limited | Professional & scientific | 2010 |
| JAN Constantine Limited | Manufacturing | 2004 |
| Janus Protection Solutions Limited | Administrative & support | 2020 |
| Janusz Zagorski Transport Ltd. | Transport & logistics | 2014 |
| Jarl Residential Ltd | Real estate | 2023 |
| Jasmine Garden Delicious Ltd | Hospitality | 2025 |
| Jason Welch Building Services Ltd | Construction | 2016 |
| Jaworski Trans Ltd | Transport & logistics | 2014 |
| Jay's Computer Services Limited | Information & communication | 2019 |
| Jaymar Electrical Cabling Services Limited | Construction | 2009 |
| Jaymar Holdings Limited | Financial services | 2022 |
| Jaymar Trustees Ltd | Financial services | 2023 |
| Jaypam Property Limited | Real estate | 2022 |
| Jazzo Ltd | Hospitality | 2025 |
| JB Investments (Cheshire) Limited | Financial services | 2019 |
| Jb's Garden & Home Maintenance Ltd | Administrative & support | 2025 |