| Inspiredsoft Ltd | Manufacturing | 2012 |
| Iron Castle Campers Ltd | Manufacturing | 2025 |
| J and P Media House Ltd | Hospitality | 2025 |
| J Lowe Aesthetics Ltd | Other services | 2023 |
| J Ward Services Limited | Transport & logistics | 2022 |
| J Wiltshire Tree Care Ltd | Agriculture & fishing | 2020 |
| J&M 24HR Healthcare Ltd | Health & social care | 2018 |
| J&S Building & Roofing Ltd | Construction | 2025 |
| J-Tech Energy Group Ltd | Construction | 2025 |
| J.H. Mccloy & Co Limited | Agriculture & fishing | 1987 |
| James Farrah Limited | Health & social care | 2021 |
| JBC Transport Ltd | Transport & logistics | 2023 |
| Jeab's Thai Catering Ltd | Hospitality | 2017 |
| Jimtech Ltd | Wholesale & retail | 2023 |
| JJ & SON Property Limited | Hospitality | 2021 |
| Jjwb Engineering Limited | Professional & scientific | 2020 |
| JKH Homes Ltd | Real estate | 2026 |
| JKM Fast Food Ltd | Hospitality | 2024 |
| JKM Investment Properties Ltd | Real estate | 2024 |
| JKM Retail Trading Ltd | Wholesale & retail | 2025 |
| JL Holidays Ltd | Administrative & support | 2024 |
| Jobzie Ltd | Information & communication | 2025 |
| John Harker's Shipyard Ltd | Manufacturing | 2020 |
| John Holland Electrical Solutions Limited | Construction | 2014 |
| Josan WF11 Ltd | Transport & logistics | 2024 |
| JRM Time Piece Ltd | Wholesale & retail | 2024 |
| JT Earthworks Ltd | Construction | 2018 |
| Jules Blackwell Consulting Limited | Professional & scientific | 2012 |
| Just Venues Limited | Administrative & support | 2024 |
| K C Caviar Limited | Manufacturing | 2012 |
| K J Lettings (Yorkshire) Ltd | Real estate | 2024 |
| K.M.R. Skip Hire Limited | Water & waste | 2000 |
| K.M.R. Waste Management Limited | Water & waste | 1999 |
| K9 Site Services Ltd | Other services | 2019 |
| Klewicz Transport Ltd | Transport & logistics | 2013 |
| Knight Investments (Yorkshire) Ltd | Real estate | 2026 |
| Knottingley Market Limited | Wholesale & retail | 2025 |
| Knottingley Self Storage Limited | Real estate | 2016 |
| Komuute Limited | Wholesale & retail | 2024 |
| Kspl Group Limited | Real estate | 2025 |
| Kuliva Ltd | Transport & logistics | 2023 |
| Language Bond Ltd | Education | 2021 |
| Latherup Ltd | Wholesale & retail | 2019 |
| LB Carr Properties Limited | Real estate | 2026 |
| LBT NDT Ltd | Professional & scientific | 2025 |
| LC Plant Services Ltd | Manufacturing | 2017 |
| LCL Prime Properties Ltd | Real estate | 2026 |
| Leemark Limited | Wholesale & retail | 2021 |
| Lgsl Online Ltd | Wholesale & retail | 2026 |
| Light Property Services Ltd | Real estate | 2019 |
| LIS Transport Services Ltd | Transport & logistics | 2017 |
| Lisa Star Nails & Spa Limited | Other services | 2025 |
| LJC Welfare Ltd | Administrative & support | 2025 |
| LJS Cleanease Ltd | Administrative & support | 2024 |
| Loft Conversion Leeds Ltd | Construction | 2025 |
| Lola Yorkshire Investments Limited | Real estate | 2021 |
| LRK Events Ltd | Wholesale & retail | 2025 |
| Lucky House 2025 Ltd | Hospitality | 2025 |
| Lululocks Ltd | Wholesale & retail | 2026 |
| Luxurcleans Limited | Administrative & support | 2025 |
| LVL Care Ltd | Public administration | 2025 |
| M B Vulcanising Limited | Manufacturing | 2002 |
| M Price IT Ltd | Information & communication | 2013 |
| M.J.N. Installations Ltd | Construction | 2016 |
| M.Richardson Consulting Limited | Professional & scientific | 2022 |
| MAC Industrial Ltd. | Professional & scientific | 2024 |
| Maciu Piciu Limited | Transport & logistics | 2019 |
| MAD Dog Restaurants Limited | Hospitality | 2024 |
| Magsons Construction Limited | Real estate | 1997 |
| Main Land Autos Ltd | Wholesale & retail | 2021 |
| Manor and Meadow Ltd | Construction | 2025 |
| Manor Grange Stables Ltd | Arts & recreation | 2021 |
| Masters Construction Poole Ltd | Agriculture & fishing | 2013 |
| Maxgen Engineering.Com Ltd | Construction | 2020 |
| Maya Lettings Limited | Real estate | 2026 |
| MB Roofing & Leadwork (Yorkshire) Ltd | Construction | 2024 |
| Mcateer Developments Ltd | Construction | 2026 |
| Mcateer Property Consultants Ltd | Real estate | 2021 |
| Mcateer Property Group Ltd | Financial services | 2025 |
| Mcateer Property Holdings & Investments Ltd | Real estate | 2025 |
| MCR Cars Ltd | Wholesale & retail | 2020 |
| MD Autos & Recovery Limited | Wholesale & retail | 2025 |
| Medical GAS Consultancy Ltd | Professional & scientific | 2024 |
| Michael Coomber Ltd | Construction | 2026 |
| Mico Planning Services Limited | Professional & scientific | 2013 |
| Micocap Ltd | Real estate | 2025 |
| Mija Transport Limited | Transport & logistics | 2020 |
| Mmbs Plumbing and Heating Ltd | Construction | 2013 |
| Modado Services Ltd | Wholesale & retail | 2025 |
| Mokkha CIC | Health & social care | 2024 |
| More Than a Game Ltd | Arts & recreation | 2025 |
| Motor City Motorist Centres Ltd. | Wholesale & retail | 1985 |
| MSK Brickwork Limited | Construction | 2019 |
| MSK Takeaway Ltd | Hospitality | 2023 |
| MTE Grinding Services Ltd | Professional & scientific | 2022 |
| Multi-Tech Engineering (UK) Limited | Manufacturing | 2006 |
| Muntean Haulage Limited | Transport & logistics | 2016 |
| My Sultan Ltd | Hospitality | 2017 |
| Nature Lean Ltd | Wholesale & retail | 2023 |
| Nortexilova Ltd | Wholesale & retail | 2026 |