| IP Properties Limited | Real estate | 2013 |
| IP Wakefield Limited | Real estate | 2024 |
| Irfan Omar Limited | Health & social care | 2022 |
| Iris Vets Ltd | Professional & scientific | 2024 |
| Irish Wakefield Ltd | Hospitality | 2025 |
| Iron Circle Crossfit and Fitness Ltd | Arts & recreation | 2024 |
| Iron Veil Studios Ltd | Information & communication | 2025 |
| Iskn Food Haven Ltd | Hospitality | 2025 |
| Island Property Solutions Limited | Real estate | 2017 |
| Istanbul Barber (Wakefield) Ltd | Other services | 2022 |
| Istanbul WKD Ltd | Administrative & support | 2018 |
| IT & Media Consulting Limited | Information & communication | 2015 |
| IT - Business Consulting Limited | Administrative & support | 2006 |
| IT IS Consult Limited | Information & communication | 2016 |
| IT Merchandise Ltd | Wholesale & retail | 2025 |
| It-Tech 4 ALL Limited | Wholesale & retail | 2021 |
| Italia & Kashmir Express Ltd | Hospitality | 2024 |
| Itravel Direct Limited | Transport & logistics | 2022 |
| IWT Technologies Limited | Professional & scientific | 2008 |
| IXL Coaching Ltd | Professional & scientific | 2022 |
| Ixtra Concepts Limited | Administrative & support | 2013 |
| Iyaka Bar Events Ltd | Hospitality | 2023 |
| Iyosky Healthcare Ltd | Health & social care | 2025 |
| Izzy Ahmed Ltd | Information & communication | 2023 |
| J & H Abraham Ltd | Professional & scientific | 2023 |
| J & H Holmes Property Ltd | Real estate | 2024 |
| J & L Air CON and Vent Limited | Administrative & support | 2017 |
| J & R Home Improvements Limited | Construction | 2023 |
| J & R Naylors of Wakefield Limited | Extraterritorial | 2007 |
| J & S Wakefield Ltd | Hospitality | 2026 |
| J and M Carlton Company Ltd | Other services | 2024 |
| J B Cafe Limited | Extraterritorial | 2015 |
| J B Furniture (Newcastle) Limited | Wholesale & retail | 2012 |
| J Barker Joinery Limited | Construction | 2020 |
| J Bridges Haulage Limited | Transport & logistics | 2003 |
| J C O'Malley Construction Limited | Construction | 2009 |
| J Egbaiyelo Engineering Limited | Professional & scientific | 2017 |
| J G Property Maintenance Limited | Administrative & support | 2006 |
| J H Style by Design Ltd | Extraterritorial | 2024 |
| J Hill Excavations Ltd | Construction | 2022 |
| J I TEX Ltd | Extraterritorial | 2014 |
| J K P Electrical Limited | Construction | 2017 |
| J K Powder Coating Limited | Manufacturing | 2001 |
| J K Wines Ltd | Wholesale & retail | 2020 |
| J K Z C Housing Limited | Real estate | 2025 |
| J L Services & SON Limited | Construction | 2004 |
| J L Services Projects Ltd | Real estate | 2006 |
| J LEE Plastering Ltd | Construction | 2023 |
| J M B Cars Limited | Wholesale & retail | 2019 |
| J M Mini Mart Limited | Wholesale & retail | 2020 |
| J M Rock Joinery Limited | Construction | 2014 |
| J M Spink Limited | Manufacturing | 2011 |
| J Malley Electrical Limited | Construction | 2023 |
| J P G Living Ltd | Real estate | 2025 |
| J P Joinery (Wakefield) Limited | Construction | 2007 |
| J Pickup Skips Limited | Water & waste | 2017 |
| J R Classics Limited | Wholesale & retail | 2005 |
| J R Commercials Ltd | Wholesale & retail | 2014 |
| J R N Investments Limited | Real estate | 1980 |
| J S Promotions Limited | Arts & recreation | 2024 |
| J S Properties Yorkshire Limited | Real estate | 2020 |
| J Smith Silvertini Ltd | Hospitality | 2024 |
| J W Morris (Auto Services) Limited | Wholesale & retail | 2004 |
| J Watts Roofing Limited | Construction | 2008 |
| J White Transport Limited | Transport & logistics | 2020 |
| J&B Transformations Ltd | Other services | 2023 |
| J&Hd Consultancy Ltd | Professional & scientific | 2023 |
| J&J Kwok Assets Ltd | Real estate | 2024 |
| J&L Industrial Roof-Clad Ltd | Construction | 2024 |
| J&R Electrical Installations Ltd | Construction | 2023 |
| J&S Developments (Yorkshire) Limited | Manufacturing | 2016 |
| J&S Style Limited | Other services | 2023 |
| J&S Tempest Ltd | Real estate | 2023 |
| J'S Cycle Shack Ltd | Wholesale & retail | 2014 |
| J-Lal Leisure Limited | Hospitality | 2019 |
| J. Burton & Sons Limited | Construction | 2018 |
| J. Butterwick Engineering Ltd | Professional & scientific | 2024 |
| J. Jeffery (Builder) Limited | Wholesale & retail | 1963 |
| J. Stuart Makin Transportations Limited | Transport & logistics | 2023 |
| J.& J.M.Asquith(Joiners & Builders)Limited | Construction | 1962 |
| J.D.El Limited | Real estate | 2006 |
| J.Grant Furniture Limited | Wholesale & retail | 2020 |
| J.K.W. Properties Limited | Administrative & support | 1986 |
| J.L. Bardon Builders Limited | Construction | 2003 |
| J.M.I. Property Ltd | Construction | 2024 |
| J.R. Morton (Wakefield) Limited | Health & social care | 1976 |
| J.S.Perkins Ltd | Administrative & support | 2025 |
| J.W Health & Safety Training Ltd | Health & social care | 2009 |
| J9 Interior Design Limited | Professional & scientific | 2015 |
| Jaars Holdings Limited | Financial services | 2019 |
| Jack Dabbler Limited | Other services | 2021 |
| Jacks and Co Catering Ltd | Wholesale & retail | 2024 |
| Jackson Leisure Satellites Ltd | Wholesale & retail | 2014 |
| Jacksons Transport (West Riding) Limited | Real estate | 1993 |
| Jacob LO Homes Limited | Construction | 2018 |
| Jacobs Well Court (Ryhill) Management Company Limited | Real estate | 2016 |
| Jacs Bar Ltd | Hospitality | 2018 |
| Jada Brooke Ltd | Professional & scientific | 2026 |
| Jade Machinery Ltd | Wholesale & retail | 2016 |
| JAE Property Group Limited | Administrative & support | 2026 |