| Local People Magazines Ltd | Information & communication | 2014 |
| Local Roofing Services Limited | Construction | 2020 |
| Locallink Health Limited | Information & communication | 2026 |
| Location Despatch Limited | Transport & logistics | 2015 |
| Locations @ Rupert Bray Limited | Information & communication | 2014 |
| Lockdown Cocktail Club Ltd | Wholesale & retail | 2021 |
| Lockers Direct Limited | Manufacturing | 2025 |
| Loft Social Ltd | Hospitality | 2023 |
| LOFT49 Limited | Professional & scientific | 2012 |
| Logau Logic Ltd | Professional & scientific | 2021 |
| Logistics Simulation Limited | Administrative & support | 1993 |
| Lokulus Ltd | Information & communication | 2019 |
| Lomas Flat Roofing Ltd | Construction | 2023 |
| Lomasa Limited | Professional & scientific | 2016 |
| London and Lancashire (Training & Research) Limited | Professional & scientific | 2013 |
| London Corporation Limited | Extraterritorial | 2013 |
| Long ASH Lane Solar Park Limited | Energy | 2015 |
| Long Ears Animal Sanctuary CIC | Agriculture & fishing | 2022 |
| Longford Property Limited | Real estate | 2015 |
| Longze Ltd | Hospitality | 2023 |
| Lontre Communications Limited | Professional & scientific | 2019 |
| Loologiq Limited | Manufacturing | 2026 |
| Loomport Sourcing U.K Ltd | Agriculture & fishing | 2025 |
| Lord and Co HR Limited | Administrative & support | 2005 |
| Lordran Property Ltd | Professional & scientific | 2026 |
| Lorrian Productions Ltd | Information & communication | 2022 |
| Lotp Ltd | Hospitality | 2026 |
| Loud New Media Limited | Information & communication | 2005 |
| Lounging Around Ltd | Manufacturing | 2022 |
| Love Handbags Limited | Wholesale & retail | 2007 |
| Lowlife Products Ltd | Manufacturing | 2016 |
| Lowry Court RTM Company Limited | Households | 2023 |
| LP Electrical (Cheshire) Ltd | Construction | 2023 |
| LS Express Limited | Transport & logistics | 1999 |
| LS Express Property Investments Limited | Extraterritorial | 2000 |
| LSL Supply Chain Logistics Limited | Transport & logistics | 2025 |
| Ltjd Audio Ltd | Information & communication | 2019 |
| Lucabella Brands Limited | Manufacturing | 2021 |
| Lucabella Sourcing Ltd | Information & communication | 2014 |
| Lucomm Rail Engineering Limited | Information & communication | 2023 |
| Lucrum House Ltd | Professional & scientific | 2021 |
| Luke Harris Media Ltd | Professional & scientific | 2020 |
| LUL Media Limited | Professional & scientific | 2023 |
| Lulu Creative & Media Ltd | Information & communication | 2025 |
| Lumiere Learning Ltd | Education | 2024 |
| Lunar Aerial Imaging Ltd | Professional & scientific | 2018 |
| Lurvo Digital Ltd | Professional & scientific | 2025 |
| Lusso Properties Limited | Construction | 2016 |
| Lusso Travel Limited | Administrative & support | 2009 |
| Luther & Luther Ltd | Construction | 2014 |
| LUX Arvika Cheshire Ltd | Construction | 2017 |
| LUX Electrical Engineering Ltd | Construction | 2025 |
| LUX Interior Ltd | Wholesale & retail | 2004 |
| Luxe Events Cheshire Limited | Arts & recreation | 2025 |
| Luxury Adlington Limited | Construction | 2019 |
| Luxury Homes Construction Limited | Construction | 2019 |
| Luxury Mariland Limited | Real estate | 2024 |
| Luxury Old World Holdings Limited | Construction | 2018 |
| Luxury Old World Investments Limited | Financial services | 2022 |
| Luxury Personal Holdings Limited | Construction | 2018 |
| Luxury Ravenswood Limited | Extraterritorial | 2019 |
| Luxury Rental Holdings Limited | Real estate | 2021 |
| LW Consultants (UK) Ltd | Professional & scientific | 2005 |
| LW Health Limited | Other services | 2026 |
| Lydiat Services Ltd | Construction | 2021 |
| Lydmi Limited | Information & communication | 2017 |
| Lyle Ecom Ltd | Wholesale & retail | 2025 |
| Lyme Business Services Limited | Professional & scientific | 2019 |
| Lymm Business Systems Ltd | Professional & scientific | 2001 |
| Lyons Park Limited | Professional & scientific | 2019 |
| M & B Project Controls Ltd | Professional & scientific | 2008 |
| M & J Crotch-Harvey Ltd | Health & social care | 2012 |
| M & M Asset Maintenance Limited | Extraterritorial | 2004 |
| M & R Motors Limited | Wholesale & retail | 2008 |
| M a M Automotive Holdings Limited | Financial services | 2021 |
| M a M Automotive Limited | Wholesale & retail | 2015 |
| M J Roberts Decorating Ltd | Construction | 2019 |
| M LEA Medical Ltd | Health & social care | 2023 |
| M N Pegg Electrical Ltd | Construction | 2021 |
| M P Cycles Limited | Transport & logistics | 2005 |
| M Shaw Agricultural Supplies Limited | Other services | 2026 |
| M Skelly Limited | Professional & scientific | 2013 |
| M Square Ltd | Hospitality | 2018 |
| M&A Shining Ltd | Wholesale & retail | 2020 |
| M&E Commercial Management Limited | Administrative & support | 2015 |
| M&F Fabs Ltd | Construction | 2026 |
| M&F Housing Limited | Households | 2025 |
| M&J Repairs Ltd | Construction | 2021 |
| M&M Construction Group Ltd | Construction | 2025 |
| M-Cool Limited | Other services | 2006 |
| M. C. Landscapes Limited | Administrative & support | 2003 |
| M. RAY Limited | Real estate | 1947 |
| M. Stanley & Sons Limited | Extraterritorial | 2002 |
| M. Thompson Builders Limited | Construction | 1995 |
| M.Hughes Property Ltd | Households | 2025 |
| M.I.O.Way Ltd | Education | 2022 |
| M.J. Pattison Limited | Wholesale & retail | 1975 |
| M.S. Storage Equipment Limited | Wholesale & retail | 1978 |
| M2 Professional Recruitment Services Limited | Administrative & support | 2008 |
| M2 Property Ventures Ltd | Real estate | 2018 |