| JP Properties Manchester Ltd | Real estate | 2015 |
| JPC & DJ Atone Limited | Real estate | 2019 |
| JS51 Ltd | Real estate | 2025 |
| JT Functions Ltd | Hospitality | 2019 |
| JT O'Shea Medical Limited | Health & social care | 2019 |
| JTC Excavations Limited | Construction | 2002 |
| Judmap Limited | Construction | 2021 |
| JW Social Link Graphics Ltd | Professional & scientific | 2026 |
| JW Social Link Ltd | Professional & scientific | 2025 |
| JW Social Link PR Ltd | Professional & scientific | 2026 |
| JW Social Link Web Design Ltd | Information & communication | 2025 |
| Kate Hemingway Media Ltd | Information & communication | 2025 |
| KB Homes (Huddersfield) Ltd | Real estate | 2019 |
| Kbse Properties Ltd | Real estate | 2025 |
| Kebroyd Property Ltd | Real estate | 2020 |
| Kenworthy's Cakes Ltd | Manufacturing | 2020 |
| KGJ Access Limited | Mining & quarrying | 2019 |
| Kikaikintou Limited | Information & communication | 2011 |
| Kjlc Properties Limited | Real estate | 2017 |
| Knee Solutions Limited | Health & social care | 2011 |
| Knibbs & Co. Ltd | Health & social care | 2020 |
| Knight Graphics Limited | Professional & scientific | 2005 |
| KS Company NO.1 Limited | Professional & scientific | 2015 |
| KS Company NO.2 Limited | Professional & scientific | 2015 |
| LA Hybrid Catch Limited | Arts & recreation | 2024 |
| Labrisa Catering Ltd | Hospitality | 2025 |
| LAK Grocery Store Ltd | Wholesale & retail | 2025 |
| Lake Instruction Tech Ltd | Wholesale & retail | 2022 |
| Lake View Events North Ltd | Hospitality | 2026 |
| Lake View Stays Ltd | Hospitality | 2026 |
| Larchwood Financial Solutions Ltd | Financial services | 2018 |
| Layla and Green Limited | Manufacturing | 2017 |
| Ld&D Ltd | Wholesale & retail | 2024 |
| Leading Hand Ltd | Information & communication | 2014 |
| Leeds and London Developments Limited | Construction | 2012 |
| Leeds and London Estates Limited | Real estate | 2020 |
| Leeds and London Group Ltd | Professional & scientific | 2015 |
| Leeds and London Holdings Limited | Construction | 1981 |
| Leeds and London Investments Limited | Construction | 2009 |
| Leeds and London Investments Number 2 Limited | Real estate | 2023 |
| Leeds and London Investments Number 3 Limited | Real estate | 2023 |
| Leeds and London Properties Limited | Construction | 1994 |
| Level UP Giveaways Ltd | Wholesale & retail | 2019 |
| LI Asset Finance Limited | Financial services | 2013 |
| LI Business Finance LLP | | 2026 |
| LI Investment Holdings Ltd | Financial services | 2025 |
| Liftleaf Ltd | Wholesale & retail | 2025 |
| Light of Mind Ltd | Health & social care | 2022 |
| Linchpin Consultancy Services Limited | Information & communication | 2018 |
| Liquidation Warehouse Ltd | Wholesale & retail | 2025 |
| Liutao Tech Ltd | Wholesale & retail | 2023 |
| Live Right Body Wellness Ltd | Health & social care | 2024 |
| LLY the Label Limited | Wholesale & retail | 2021 |
| Local Products (CL) Limited | Wholesale & retail | 2019 |
| Lockside FIVE7 Limited | Financial services | 2013 |
| Lonely Panda Ltd | Information & communication | 2019 |
| Love Projects Ltd | Real estate | 2016 |
| Loveproperty ES Ltd | Real estate | 2017 |
| Lozand Limited | Hospitality | 2025 |
| LSC Search Limited | Administrative & support | 2021 |
| LTS Strike Ltd | Wholesale & retail | 2025 |
| Luka Triangle Limited | Education | 2018 |
| Lumb Group Ltd | Construction | 2022 |
| LZZ Trading Ltd | Wholesale & retail | 2025 |
| M & D Yorkshire Properties Limited | Real estate | 2018 |
| M and G Metal Finishers Limited | Manufacturing | 2003 |
| M Clothier Limited | Financial services | 2015 |
| M Gear & Sons Limited | Construction | 2007 |
| M Gleeson Plant Hire Limited | Construction | 2016 |
| M Kane Electrical Limited | Construction | 2019 |
| M. & B. Commercial Properties Limited | Construction | 1977 |
| M.A.S. Laundry Engineering Services Limited | Manufacturing | 2003 |
| M2V Limited | Households | 2018 |
| Macdonald Martin Limited | Public administration | 2003 |
| MAE Systems Limited | Information & communication | 2003 |
| Maid to Sparkle Halifax Ltd | Administrative & support | 2011 |
| Making Place Management Company Limited | Households | 2004 |
| Marilyn Brichard Limited | Professional & scientific | 2012 |
| Marina Retail Ltd | Hospitality | 2026 |
| Maxfelt Limited | Manufacturing | 2015 |
| MBI Walsden Care Limited | Health & social care | 2013 |
| MBL Enterprise Ltd | Hospitality | 2022 |
| MCA Mechanical Services Limited | Manufacturing | 2004 |
| Mccabe & Stoyles Developments Ltd | Real estate | 2021 |
| Mclaren Consultancy Services Ltd | Construction | 2011 |
| Medici Financial Services Ltd | Financial services | 2012 |
| Medsec Pro Ltd | Administrative & support | 2025 |
| Merry ARC Properties Ltd | Real estate | 2026 |
| Mevamro Ltd | Real estate | 2024 |
| Mglok Ltd | Wholesale & retail | 2026 |
| MH Change Consulting Ltd | Information & communication | 2026 |
| Michael Heap Limited | Transport & logistics | 1999 |
| Milerou Soulfl Ltd | Wholesale & retail | 2024 |
| Millhouse World of Wood Limited | Agriculture & fishing | 2012 |
| Mind-U Limited | Health & social care | 2026 |
| Minerva House Nottingham RTM Company Limited | Households | 2022 |
| Miphone Doctor Ltd | Other services | 2017 |
| MJ Bars Ltd | Hospitality | 2025 |
| MJ Construction & Investments Limited | Construction | 2024 |
| Mjbm Limited | Real estate | 2019 |