| Jansolo Ltd | Professional & scientific | 2023 |
| Janus Business Consulting Limited | Administrative & support | 2002 |
| Jarvis Agencies Ltd | Wholesale & retail | 2012 |
| Jason Donald Limited | Construction | 2020 |
| Jasontan 2022 Ltd | Hospitality | 2022 |
| JAY Webb Consultancy Services Limited | Information & communication | 2008 |
| JAY2BASE Business Services Ltd | Professional & scientific | 2016 |
| Jaybeeaitch Ltd | Wholesale & retail | 2025 |
| Jayell Properties Ltd | Real estate | 2026 |
| Jayfix Ltd | Real estate | 2019 |
| Jaylets Limited | Real estate | 2015 |
| Jayona Limited | Professional & scientific | 2006 |
| Jazberry Limited | Professional & scientific | 2012 |
| JB Agarbatti Maker Ltd | Wholesale & retail | 2023 |
| JB Gotham Ltd | Wholesale & retail | 2018 |
| JB Property and Lettings Ltd | Real estate | 2026 |
| JB Salt Ltd | Health & social care | 2026 |
| JBE Sports Therapy Limited | Other services | 2022 |
| Jbec Ltd | Construction | 2022 |
| JC Independent Stores Ltd | Wholesale & retail | 2025 |
| JC Metalworks Limited | Manufacturing | 2002 |
| JC Pipe Fitting Limited | Construction | 2002 |
| JC Prop Co 1 Limited | Real estate | 2025 |
| JC Prop Co 2 Limited | Real estate | 2025 |
| JCC Trading Ltd | Wholesale & retail | 2014 |
| Jcew Investments Ltd | Real estate | 2022 |
| JCK Holdings Ltd | Financial services | 2017 |
| JCS Comms Limited | Construction | 2024 |
| JCS Personnel Ltd | Administrative & support | 2024 |
| JD Home Investments Limited | Real estate | 2023 |
| JD Toone Home Improvements Limited | Construction | 2017 |
| JDP Networks Limited | Information & communication | 2021 |
| Jdutopia Ltd | Professional & scientific | 2019 |
| Ject Enterprises Limited | Professional & scientific | 2016 |
| Jeepers Developments Limited | Real estate | 2021 |
| Jekian Limited | Financial services | 2025 |
| Jelmo Services Ltd | Financial services | 2011 |
| JEM (East Midlands) Limited | Real estate | 2015 |
| Jemline Ventures Limited | Real estate | 1996 |
| Jenifferr Speed Transport Ltd | Transport & logistics | 2026 |
| Jennifer a Ellis Limited | Extraterritorial | 2016 |
| Jennings & Walsh Developments Limited | Construction | 2016 |
| Jenny Clarke Design Limited | Arts & recreation | 2006 |
| Jessica MAE Properties Ltd | Real estate | 2024 |
| Jevan Consultancy Ltd | Professional & scientific | 2015 |
| JEX Surveyors Limited | Professional & scientific | 2013 |
| JEZ Ainsworth Terracotta Limited | Arts & recreation | 2008 |
| JF Accountancy & Financial Services Ltd | Professional & scientific | 2020 |
| JGC Autocare Ltd | Wholesale & retail | 2023 |
| JGP Produce Limited | Professional & scientific | 2011 |
| JGW Properties Ltd | Real estate | 2019 |
| JH & KH Properties Limited | Real estate | 2021 |
| JH Services (Leics) Ltd | Construction | 2020 |
| Jhutchinson Ltd | Professional & scientific | 2023 |
| Jill's Launderette & DRY Cleaners Ltd | Other services | 2018 |
| Jill's Wash N DRY Ltd | Other services | 2013 |
| Jimmy Endicott Limited | Professional & scientific | 2023 |
| Jimmy Pickle Properties Ltd | Real estate | 2022 |
| Jireh Faithware Ltd | Manufacturing | 2025 |
| JJ Petroleum Limited | Wholesale & retail | 2003 |
| Jjams Properties Ltd | Households | 2025 |
| JJD House Ltd | Real estate | 2025 |
| JJM Property Revive Limited | Construction | 2024 |
| JJS Consultants 2013 Limited | Wholesale & retail | 2013 |
| JK Composites Ltd | Professional & scientific | 2023 |
| JK Online Seller Ltd | Wholesale & retail | 2021 |
| JK Ventilation Limited | Construction | 2022 |
| JKM Swimschool Loughborough Ltd | Education | 2024 |
| JKM Swimschool Shepshed Ltd | Education | 2024 |
| JKR3 Distribution Ltd | Hospitality | 2015 |
| JL Secure Ltd | Professional & scientific | 2025 |
| JL Signs Limited | Professional & scientific | 2023 |
| JLC Investment Properties Ltd | Real estate | 2025 |
| JLF Testing Ltd | Information & communication | 2012 |
| JM Hall Consulting Ltd | Professional & scientific | 2023 |
| JM Sportsmed Ltd | Health & social care | 2024 |
| JM Strategic Advisory Ltd | Professional & scientific | 2026 |
| JMC Transport Limited | Transport & logistics | 2018 |
| JMG Amenity Limited | Other services | 2008 |
| JMH Builders Limited | Construction | 2021 |
| Jmjav Limited | Real estate | 2023 |
| JMK Wealth Management Limited | Financial services | 2020 |
| JMY Holdings Ltd | Financial services | 2017 |
| JNC Building & Joinery Ltd | Construction | 2021 |
| JO3 Engineering Services Ltd | Professional & scientific | 2025 |
| JOE Fisher Ltd | Construction | 2014 |
| JOE Taylor Consultants Ltd | Professional & scientific | 2025 |
| John Bennett Heating Limited | Construction | 2018 |
| John Dory's Leicester Ltd | Professional & scientific | 2019 |
| John Dory's Loughborough Ltd | Professional & scientific | 2019 |
| John Dory's Quorn Ltd | Hospitality | 2016 |
| John Duffin Property Ltd | Real estate | 2026 |
| John Fairley Properties Limited | Real estate | 2004 |
| John James Frederick Hodges Ltd | Extraterritorial | 2024 |
| John Paul Harrison 1951 Limited | Other services | 2012 |
| John R. King Limited | Professional & scientific | 2008 |
| John Storer Charnwood | Public administration | 2001 |
| John Taylor Bell Foundry (Loughborough) Limited | Manufacturing | 2009 |
| Johncock and Ramanandi Property Ltd | Real estate | 2019 |
| Johnson & Arrowsmith Medicolegal Ltd | Health & social care | 2025 |