| Jack Thomas Estates Limited | Real estate | 2019 |
| James Labels and Supplies Limited | Manufacturing | 2001 |
| Jardine Garden Furniture Limited | Manufacturing | 2017 |
| Jaysafe Limited | Construction | 2012 |
| Jc-Projects Ltd | Construction | 2025 |
| JD Seller Ltd | Wholesale & retail | 2026 |
| Jelly Interactive Ltd | Information & communication | 2025 |
| JF Electrical & Security Systems Limited | Construction | 2023 |
| JJC Commercials Ltd | Wholesale & retail | 2026 |
| Jjcc Limited | Financial services | 2024 |
| Jjde Limited | Construction | 2020 |
| JJO Group Limited | Manufacturing | 2017 |
| JJO Holdings Limited | Manufacturing | 2017 |
| JJR Video Productions Ltd | Information & communication | 2021 |
| JK Asset Finance Ltd | Administrative & support | 2005 |
| JK Electricals New Used and Refurbished Ltd | Wholesale & retail | 2023 |
| JKS Grill Ltd | Hospitality | 2020 |
| John Ashworth & Partners Limited | Professional & scientific | 2001 |
| John Kavanagh Limited | Administrative & support | 2013 |
| Johnb Lettings Ltd | Real estate | 2017 |
| Johnston Counselling Limited | Health & social care | 2025 |
| JPA Utilities Ltd | Construction | 2010 |
| JR Terrier Accounts Limited | Professional & scientific | 2024 |
| Just Buttons Limited | Manufacturing | 2012 |
| Just Fit in Global Ltd | Wholesale & retail | 2025 |
| K.F. Earthworks & Plant Hire Limited | Construction | 2007 |
| Kalki Restaurants Limited | Hospitality | 2025 |
| Karnarva (UK) Limited | Administrative & support | 1999 |
| Kehocs Ltd | Information & communication | 2018 |
| KF Petroleum Limited | Wholesale & retail | 2024 |
| KF Properties MCR Limited | Real estate | 2025 |
| KF Retail Limited | Wholesale & retail | 2023 |
| Khadyrin Ltd | Administrative & support | 2021 |
| Khan & Brown Commercial Services Ltd | Energy | 2026 |
| Khan Commercial Services Limited | Professional & scientific | 2026 |
| Kids Klub Burnley Limited | Health & social care | 2009 |
| Kids Monzo Limited | Arts & recreation | 2025 |
| Kiercam Group Ltd | Administrative & support | 2016 |
| Kiki Local Corner Shop Ltd | Wholesale & retail | 2026 |
| Kiqlobarias Ltd | Transport & logistics | 2021 |
| Knuckledown Theatre Limited | Arts & recreation | 2014 |
| Koko Property Group Ltd | Real estate | 2026 |
| Krokethamz Ltd | Administrative & support | 2021 |
| L&D Property Management & Lettings Ltd | Real estate | 2025 |
| L-Inkable Media Ltd | Professional & scientific | 2022 |
| Lakesidepropertymaintenance Ltd | Construction | 2025 |
| Lancashire Sock Manufacturing Company | Manufacturing | 1953 |
| Lange Care Consulting Ltd | Professional & scientific | 2026 |
| LAS Security Limited | Administrative & support | 2019 |
| Lasmaintenance Ltd | Construction | 2025 |
| Laura Mcmillan Creative Ltd | Professional & scientific | 2021 |
| Laven & Ivory Ltd | Wholesale & retail | 2024 |
| Lazam Limited | Professional & scientific | 2025 |
| Leabrook Limited | Wholesale & retail | 2017 |
| Leach Commercials Limited | Wholesale & retail | 2013 |
| Learn Advanced English Ltd | Education | 2022 |
| Lease UP Limited | Information & communication | 2023 |
| Leather Waste UK Limited | Water & waste | 2013 |
| Leavenry Ltd | Manufacturing | 2025 |
| Legacy Building Solutions Ltd | Construction | 2024 |
| Liberate US Ltd | Professional & scientific | 2021 |
| Lightbox'D Limited | Manufacturing | 2018 |
| Link UP Wholesale Tyres Ltd | Wholesale & retail | 2026 |
| Little Gymmies Ltd | Manufacturing | 2025 |
| Little Leaf Contracting Ltd | Construction | 2025 |
| Little Reservoir Consulting Ltd | Professional & scientific | 2026 |
| LIZ Cooper Consultants Limited | Professional & scientific | 2021 |
| LIZ Henson Photography Limited | Extraterritorial | 2022 |
| Looped Energy Communities CIC | Professional & scientific | 2024 |
| Luciella Property Ltd | Real estate | 2024 |
| Luciella&Co Ltd | Other services | 2026 |
| Lunovia Jewellery Ltd | Manufacturing | 2025 |
| LVS (Bacup) Ltd | Arts & recreation | 2025 |
| M a Building Maintenance Limited | Construction | 2018 |
| M a Building Projects Ltd | Construction | 2024 |
| M C Developments (North West) Ltd | Real estate | 2023 |
| M C Excavations Ltd | Construction | 2008 |
| M Dempsey Plastering Contractors Limited | Construction | 2019 |
| M J Egan Contractors Ltd | Construction | 2009 |
| M J Egan Properties Ltd | Real estate | 2019 |
| M.A.P Performance Ltd | Administrative & support | 2023 |
| M.Emma Properties Ltd | Real estate | 2026 |
| Mackenzie Technical Solutions Ltd | Information & communication | 2018 |
| Madebymountains Limited | Professional & scientific | 2020 |
| Magopat Limited | Wholesale & retail | 2018 |
| Mama Arifa 17 Limited | Hospitality | 2025 |
| Mamas Pizza Place Ltd | Hospitality | 2024 |
| Mamma Arifa Limited | Hospitality | 2022 |
| Mana Made Ltd | Wholesale & retail | 2025 |
| Mancstart Decor Ltd | Other services | 2024 |
| Manor Prestige Landscapes Ltd | Other services | 2016 |
| Marie Harris Consultancy Ltd | Professional & scientific | 2023 |
| Marios of Bacup Limited | Hospitality | 2015 |
| Marl Pits Garden Centre Limited | Wholesale & retail | 2017 |
| Matparts Ltd | Wholesale & retail | 2006 |
| MD Clinical Ltd | Health & social care | 2025 |
| MDK Tech Limited | Information & communication | 2020 |
| Meadows Mill Development Ltd | Construction | 2023 |
| Merecourt Properties Limited | Financial services | 2012 |
| Merlyn Wealth Management Ltd | Financial services | 2012 |