| J a a a Accounting Ltd | Professional & scientific | 2013 |
| J Coaching Ltd | Other services | 2023 |
| J Entertainment Ilkeston Ltd | Hospitality | 2025 |
| J J Decorators Limited | Construction | 2005 |
| J N Autoservices Ltd | Wholesale & retail | 2025 |
| J P Digital Ltd | Information & communication | 2026 |
| J P O Couriers Ltd | Transport & logistics | 2015 |
| J R Driving Ltd | Transport & logistics | 2014 |
| J Tatham Property Developments Ltd | Real estate | 2022 |
| J. Reeves Sewing Limited | Administrative & support | 1986 |
| J.B. Armstrong & Co. Limited | Wholesale & retail | 1960 |
| J.Lloyd Surfacing Ltd | Construction | 2026 |
| J.W.M. Enterprises Ltd | Real estate | 2016 |
| Jack Madison Properties Ltd | Real estate | 2023 |
| Jackgroup Management Limited | Hospitality | 1992 |
| Jackson’S Corporation Ltd | Other services | 2025 |
| Jade Dragon Chen Limited | Hospitality | 2024 |
| Jade Two Catering (UK) Ltd | Hospitality | 2008 |
| Jaffa Bikes Ltd | Wholesale & retail | 2023 |
| JAG Building Services (Ilkeston) Ltd | Construction | 2026 |
| Jaguar Fairs (East Midlands) Limited | Administrative & support | 2019 |
| Jaguar Fairs Limited | Administrative & support | 1997 |
| JAKO96 Ltd | Transport & logistics | 2025 |
| James' Jackets Ltd | Hospitality | 2023 |
| Jamini Patel Optometrist Ltd | Health & social care | 2023 |
| Jane Stapleton Photography Limited | Professional & scientific | 2005 |
| Jaycee Plant & Machinery Ltd | Wholesale & retail | 2024 |
| JB7 Investments Ltd | Real estate | 2022 |
| JBB46 Limited | Extraterritorial | 2024 |
| JCF Midlands Limited | Arts & recreation | 2024 |
| JCH Accountants Ltd | Professional & scientific | 2026 |
| JCS Precision Engineering Ltd | Manufacturing | 2023 |
| JDB Enterprises Ilkeston Limited | Wholesale & retail | 2018 |
| JDB Enterprises Nottingham Ltd | Wholesale & retail | 2014 |
| JDC Home Improvements Limited | Construction | 2014 |
| Jdelectrix Ltd | Manufacturing | 2021 |
| Jeir Engineering Ltd | Real estate | 2022 |
| Jela Partners Limited | Wholesale & retail | 2025 |
| Jester (JRT) Limited | Households | 2026 |
| JFA Cobs and Hunters Ltd | Agriculture & fishing | 2022 |
| JG Hospitality Ltd | Hospitality | 2022 |
| JGE Commercial Property Ltd | Real estate | 2026 |
| JH Kitchens & Renovations Ltd | Manufacturing | 2026 |
| JIC Construction Ltd | Construction | 2016 |
| JK Car Keys Ltd | Wholesale & retail | 2026 |
| JK Home Improvement (Ilkeston) Limited | Construction | 2023 |
| JLM Driveways & Civils Ltd | Construction | 2018 |
| JM Consultancy (UK) Limited | Professional & scientific | 2014 |
| JMG Beautyblitz Ltd | Wholesale & retail | 2025 |
| Jmmc Motors Limited | Professional & scientific | 2010 |
| Joannesbusiness Ltd | Wholesale & retail | 2025 |
| JOE Rice Tree Services Ltd | Administrative & support | 2019 |
| John Marley Ltd | Construction | 2014 |
| Johnsons Aggregates and Recycling Limited | Water & waste | 2002 |
| Johnsons Aggregates Limited | Construction | 1999 |
| Jonathan Pitts Limited | Construction | 2010 |
| Joseph Reeves Sewing (1986) Limited | Manufacturing | 2024 |
| Jovador Ltd | Wholesale & retail | 2025 |
| Joys Cafe/Takeaway Ltd | Hospitality | 2024 |
| JP Grounds Maintenance Ltd | Households | 2026 |
| Jpen Holdings Limited | Other services | 2016 |
| Jplq Limited | Administrative & support | 2026 |
| JR Composites Ltd | Professional & scientific | 2025 |
| JRD Design & Build Limited | Construction | 2012 |
| JRS Properties (Derby) Limited | Real estate | 2024 |
| JS Accountants Ltd | Professional & scientific | 2026 |
| JS Bates Consultancy Limited | Professional & scientific | 2017 |
| JS Electrical Services (Midlands) Ltd | Construction | 2025 |
| JS Paving & Maintenance Ltd | Construction | 2020 |
| JS Property Experts Ltd | Real estate | 2025 |
| JT Poling Ltd | Information & communication | 2014 |
| JTO Fibre Ltd | Information & communication | 2021 |
| Judy Taverns Limited | Real estate | 2009 |
| Just Builders Limited | Construction | 2022 |
| Just Lovely Products Ltd | Wholesale & retail | 2015 |
| Just Motor Homes Limited | Wholesale & retail | 2020 |
| Just Move (Nottingham) Limited | Real estate | 2014 |
| JW Business Consulting Ltd | Professional & scientific | 2026 |
| Jz&K Civil Consultancy Limited | Construction | 2025 |
| K & N Care and Clean Ltd | Administrative & support | 2026 |
| K B Investments Limited | Extraterritorial | 2013 |
| K Davey Construction Ltd | Construction | 2020 |
| K. & E. Peck Limited | Construction | 1995 |
| K. B. Packaging Group Ltd | Financial services | 2026 |
| K.B. Packaging | Wholesale & retail | 1986 |
| K.B. Packaging (UK) LLP | | 2012 |
| K.R.M. Real Estate Limited | Real estate | 2023 |
| K2 Accountancy Group Ltd | Professional & scientific | 2021 |
| K2 Accountancy Services Ltd | Professional & scientific | 2021 |
| K9 Detection Dogs (UK) Ltd | Administrative & support | 2026 |
| Kactus Group Enterprise Limited | Wholesale & retail | 2020 |
| Kandoroo CIC | Other services | 2020 |
| Kapp Properties Limited | Real estate | 2014 |
| Kapstun Homes (Ilkeston) C.I.C. | Real estate | 2026 |
| Kapstun Homes Limited | Hospitality | 2022 |
| Karma Composites Ltd | Manufacturing | 2019 |
| Karmel Supplies Limited | Manufacturing | 2009 |
| Kars (UK) Limited | Wholesale & retail | 2014 |
| Kate AR Ltd | Transport & logistics | 2015 |
| Keno Construction and Landscaping Ltd | Construction | 2024 |