| Holmefield Financial Solutions Limited | Financial services | 2021 |
| Home Farm (Yorkshire) Limited | Agriculture & fishing | 2019 |
| Hubbard Associates Limited | Professional & scientific | 2005 |
| Hy-Lo International Ltd | Wholesale & retail | 2019 |
| Hypercurated Ltd | Professional & scientific | 2025 |
| I & a Management Ltd | Information & communication | 2004 |
| IAN Parsons Heating and Plumbing Limited | Construction | 2011 |
| IAR Investments (Yorkshire) Limited | Financial services | 2024 |
| Ijujo Ltd | Construction | 2024 |
| Imaginative Interiors Limited | Other services | 2014 |
| Infinite Technologies Ltd | Information & communication | 2023 |
| Inman Waverley Ltd | Professional & scientific | 2002 |
| Innserve Limited | Other services | 2010 |
| IP Vibe Limited | Professional & scientific | 2025 |
| It's Promotional Limited | Professional & scientific | 2017 |
| IVY House Property Ltd | Real estate | 2021 |
| J Marston Consulting Limited | Information & communication | 2023 |
| J P Walsh Trustee Company (NO.1) Limited | Professional & scientific | 2013 |
| J P Walsh Trustee Company (NO.2) Limited | Professional & scientific | 2013 |
| J Parnaby Electrical Limited | Construction | 2017 |
| J&J Ironworks Ltd | Manufacturing | 2019 |
| Jager Diamonds Limited | Wholesale & retail | 2020 |
| James Eaton Design Limited | Other services | 2013 |
| James Hart Investments Ltd | Other services | 2026 |
| Jaroke Collective Ltd | Real estate | 2024 |
| JB Northern Holdings Ltd | Construction | 2026 |
| JCE Property Ltd | Households | 2020 |
| Jeryal Consulting Ltd | Professional & scientific | 2019 |
| JHM Kaye Limited | Real estate | 2021 |
| Jigsaws Childcare Limited | Education | 2007 |
| JM Westaby Timber Buildings Ltd | Manufacturing | 2014 |
| Joanne Thompson Coaching Ltd | Professional & scientific | 2023 |
| John Whittlestone Associates Limited | Construction | 2007 |
| Johnson Insurance Services Ltd | Financial services | 2017 |
| Jonathan Ketteridge Accommodation Limited | Real estate | 2023 |
| Jorvik Estates Limited | Real estate | 2018 |
| Joseph Consultancy Limited | Information & communication | 2018 |
| Jotpot Ltd | Information & communication | 2018 |
| JR Vehicle Logistics Limited | Transport & logistics | 2025 |
| Justbeing Ltd | Other services | 2015 |
| Jvincent Vehicle Solutions Ltd | Wholesale & retail | 2025 |
| JW Inspections & Turbines Ltd | Professional & scientific | 2018 |
| JWH Consultancy Ltd | Financial services | 2012 |
| Kalchal Limited | Wholesale & retail | 2010 |
| KDW Anaesthesia Ltd | Health & social care | 2019 |
| KEG Consulting Limited | Professional & scientific | 2016 |
| KF Reilly Ltd | Administrative & support | 2022 |
| Kingfisher Property Maintenance Ltd | Other services | 2021 |
| KME Kirk Deighton Limited | Health & social care | 2022 |
| KME Nurseries Limited | Financial services | 2022 |
| Komodo Software Limited | Other services | 2009 |
| Kood Limited | Wholesale & retail | 2018 |
| Kruger Site Services Limited | Administrative & support | 2019 |
| Kyanite Blue Ltd | Information & communication | 2020 |
| L & G Williams Limited | Wholesale & retail | 2007 |
| L C F a Limited | Education | 2018 |
| Laithes Upholstery Limited | Manufacturing | 2015 |
| Lawns for Leisure Limited | Administrative & support | 2010 |
| LC AFC Limited | Arts & recreation | 2018 |
| LCF Automotive Limited | Wholesale & retail | 2020 |
| Lcfc - Leeds City Football Club Limited | Professional & scientific | 2021 |
| Lcfc Limited | Professional & scientific | 2016 |
| Lcfe Limited | Professional & scientific | 2022 |
| LDJ Management Limited | Construction | 2012 |
| Lean Agile Solutions Limited | Information & communication | 2016 |
| Leasingthorne Ltd | Wholesale & retail | 2022 |
| Leeds Breast and Cosmetic Clinic Limited | Health & social care | 2016 |
| Leeds City AFC Limited | Arts & recreation | 2018 |
| Leeds City FC Ltd | Professional & scientific | 2016 |
| Leeds City Football Academy Limited | Education | 2018 |
| Leeds City Football Club Limited | Arts & recreation | 2003 |
| Leeds City Football Elite Limited | Professional & scientific | 2022 |
| Leeds City Limited | Professional & scientific | 2016 |
| Leeds East Airport Bistro Limited | Hospitality | 2026 |
| Lesley Wright Improvement Limited | Professional & scientific | 2013 |
| LET Wise Properties Limited | Real estate | 2026 |
| Letsgonode Ltd | Administrative & support | 2023 |
| Limitless Automotive Limited | Wholesale & retail | 2022 |
| Little Pudding London Limited | Wholesale & retail | 2025 |
| LIZ Lawson Psychology Ltd | Health & social care | 2022 |
| Llangennith Ltd | Transport & logistics | 2021 |
| Lmhq Limited | Arts & recreation | 2022 |
| Lucky Star 888 Ltd | Hospitality | 2022 |
| Lucy Lets Ltd | Real estate | 2022 |
| M T Tait Business Services Limited | Professional & scientific | 2017 |
| M&Co Finance I Limited | Financial services | 2022 |
| Macintyre Learning Group Ltd | Education | 2024 |
| Mackays Interiors Limited | Construction | 2014 |
| Magnet 2020 Ltd | Hospitality | 2020 |
| Makins Limited | Transport & logistics | 1998 |
| Manifiesto Ltd | Construction | 2025 |
| Mansio Limited | Construction | 2012 |
| Martin Holt Ltd | Construction | 2014 |
| Marvin Commercial Holdings Ltd | Extraterritorial | 2014 |
| Marvin Informatics Ltd | Other services | 2014 |
| Mason Creative Ltd | Professional & scientific | 2017 |
| Massey Phillips Properties Ltd | Real estate | 2021 |
| Matthew Mallinson Plumbing and Heating Limited | Construction | 2011 |
| MAV Studio Ltd | Professional & scientific | 2024 |
| Mavrev Ltd. | Professional & scientific | 2016 |