| Linstri Ltd | Hospitality | 2019 |
| Lintile Limited | Administrative & support | 2007 |
| Linton & Co Limited | Professional & scientific | 2013 |
| Linton Consultancy Services Ltd | Professional & scientific | 2023 |
| Linton Grange Properties Limited | Real estate | 2007 |
| Linton Investment Group Ltd | Real estate | 2025 |
| Linton Park Consulting Limited | Professional & scientific | 2009 |
| Linton Research Limited | Administrative & support | 2013 |
| Linton UK Maintenance Ltd | Construction | 2011 |
| Lisle Jones Ltd | Financial services | 2023 |
| Lisle Jones Property Ltd | Real estate | 2024 |
| Lister Brothers (Upholstery) Limited | Professional & scientific | 1997 |
| Listers of Boston Spa Limited | Professional & scientific | 1938 |
| Lithos Consulting Limited | Professional & scientific | 2009 |
| Littlecroft Management Company Limited | Households | 2016 |
| Live by Lulu Limited | Wholesale & retail | 2021 |
| Live Your Plans Ltd | Professional & scientific | 2026 |
| Living Potential Care Farming C.I.C. | Health & social care | 2016 |
| LMA Community Sports Development CIC | Education | 2026 |
| Lmacademy Coaching Limited | Education | 2025 |
| LMB Flooring Ltd | Construction | 2019 |
| LME Group Ltd | Professional & scientific | 2024 |
| LNG Engineering Services Ltd | Professional & scientific | 2024 |
| Lnvn Revision Limited | Education | 2025 |
| Local Renewable Services Ltd | Construction | 2014 |
| Logicor (AU) Limited | Manufacturing | 2012 |
| Logicor (CA) Limited | Manufacturing | 2012 |
| Logicor (CN) Limited | Real estate | 2012 |
| Logicor (Group) Limited | Manufacturing | 2012 |
| Logicor (HK) Limited | Manufacturing | 2012 |
| Logicor (in) Limited | Manufacturing | 2012 |
| Logicor (IP2) Limited | Professional & scientific | 2020 |
| Logicor (R&D) Limited | Professional & scientific | 2012 |
| Logicor (SA) Limited | Manufacturing | 2012 |
| Logicor (UK) Limited | Manufacturing | 2008 |
| Logicor (USA) Limited | Manufacturing | 2012 |
| Logicor CTC Limited | Manufacturing | 2009 |
| Logicor International Ltd | Manufacturing | 2016 |
| Logicor Worldwide Ltd | Manufacturing | 2016 |
| Lonavla Limited | Professional & scientific | 2015 |
| Lone Star Estates (1) Limited | Real estate | 2016 |
| Longwood Joinery Holdings Limited | Professional & scientific | 2007 |
| Longwood Joinery Limited | Manufacturing | 1972 |
| Lord Botanica Limited | Wholesale & retail | 2026 |
| Lords Close (Giggleswick) Management Company Limited | Real estate | 2025 |
| Louis Arkwright Limited | Administrative & support | 2018 |
| Louise Thompson Associates Limited | Arts & recreation | 2017 |
| Louleaf Limited | Other services | 2025 |
| Lowe Bespoke Interiors Limited | Construction | 2026 |
| Lucy Jane Interiors Limited | Professional & scientific | 2016 |
| Lucy Wyld Limited | Professional & scientific | 2024 |
| LWT Accounting Limited | Professional & scientific | 2007 |
| Lyndon Associates Marketing Limited | Professional & scientific | 2014 |
| Lyness Loseby Limited | Information & communication | 2016 |
| Lynx Purchasing Limited | Administrative & support | 2003 |
| M & K Cleaning Services (Wetherby) Ltd | Administrative & support | 2014 |
| M Armitage Groundworks Limited | Administrative & support | 2025 |
| M D Accounting Services (Wetherby) Ltd | Professional & scientific | 2010 |
| M J Gaunt Limited | Professional & scientific | 2022 |
| M Marston Joinery & Building Ltd | Construction | 2019 |
| M O'Connor Plumbing & Heating Ltd | Construction | 2024 |
| M Simms Ltd | Construction | 2018 |
| M Sports Services Limited | Extraterritorial | 2024 |
| M T Halford Ltd | Construction | 2025 |
| M Thorp Roofing Contractors Ltd | Construction | 2012 |
| M. Rhodes (Timber Contractors & Tree Surgeons) Limited | Agriculture & fishing | 1971 |
| M.E.J. Accountants Ltd | Professional & scientific | 2015 |
| M.J.& G.Stross Limited | Professional & scientific | 1923 |
| M2S Solutions Ltd | Professional & scientific | 2019 |
| MAB Finance Limited | Professional & scientific | 2014 |
| Mabvo Ltd | Real estate | 2022 |
| Macc Events Limited | Hospitality | 2014 |
| Macdonald International Ltd | Professional & scientific | 2016 |
| Macfarland Developments Ltd | Construction | 2023 |
| Macgregor Group Ltd | Financial services | 2026 |
| Macventure LLP | | 2019 |
| Maddogddm (PTY) Ltd | Hospitality | 2023 |
| Maggotdrowning Limited | Information & communication | 2013 |
| Magicdust Capital Limited | Professional & scientific | 2023 |
| Magicdust Holdings Limited | Financial services | 2020 |
| Major Energy Users Council Limited | Extraterritorial | 1990 |
| Mana Consultants Ltd | Professional & scientific | 2011 |
| Manar Associates Limited | Professional & scientific | 2014 |
| Mane Door Limited | Professional & scientific | 2024 |
| Manor House Financial Services Ltd. | Financial services | 2001 |
| Maple Grove Projects Limited | Construction | 2023 |
| Maple Networks Limited | Information & communication | 2018 |
| MAR Plastics Limited | Professional & scientific | 2010 |
| Mark Coultate Limited | Health & social care | 2021 |
| Mark Readman Decorators Limited | Construction | 2003 |
| Marmion Limited | Administrative & support | 2014 |
| Marr Holdings Ltd | Financial services | 2022 |
| Marsh & Marsh Ltd | Wholesale & retail | 2026 |
| Martin House | Health & social care | 1986 |
| Martin House (Shops) Limited | Wholesale & retail | 1987 |
| Marz Digital Ltd | Wholesale & retail | 2024 |
| Mason & Sutter Limited | Administrative & support | 2019 |
| Masonjoray Limited | Professional & scientific | 2009 |
| Masonry Tech Brick & Stone Cosmetics Ltd | Administrative & support | 2017 |
| Masworth Ltd | Wholesale & retail | 2019 |