| Lighthouse Multi Academy Trust | Education | 2025 |
| Lights on Counselling Limited | Health & social care | 2025 |
| Ligra EON Ltd | Wholesale & retail | 2024 |
| Lime Homes Limited | Construction | 2008 |
| Liminal Education Ltd | Education | 2021 |
| Limitless Global Ventures Limited | Wholesale & retail | 2023 |
| Limitless Truth Ltd | Wholesale & retail | 2025 |
| Link Shopfitters Ltd | Construction | 2018 |
| Lite Systems Ltd | Construction | 2020 |
| Little Bunnies Nursery Ltd | Education | 2025 |
| Little India Catering Ltd | Wholesale & retail | 2025 |
| Little India Restaurant U.K. Ltd | Hospitality | 2024 |
| Little J House Ltd | Hospitality | 2025 |
| Lively E-Bike Limited | Wholesale & retail | 2025 |
| Liviu Transport Services Ltd | Transport & logistics | 2016 |
| LKF Ltd | Construction | 2026 |
| LM Cosmetics Ltd | Wholesale & retail | 2017 |
| LM Substations Ltd | Construction | 2023 |
| LMS Roofing & Cladding Ltd | Construction | 2012 |
| LMT Meats Limited | Administrative & support | 2017 |
| Lockleys Homes Limited | Real estate | 2024 |
| Lockstown Practice Limited | Health & social care | 2015 |
| Lockway Limited | Professional & scientific | 2006 |
| Loop Foods Limited | Wholesale & retail | 2020 |
| Louis and Oscar Limited | Extraterritorial | 2009 |
| Love LYF & Hope CIC | Administrative & support | 2024 |
| Lowfield Haulage Limited | Transport & logistics | 2025 |
| LR36 Trading Ltd | Wholesale & retail | 2019 |
| LS Events Management Limited | Other services | 2018 |
| LS Recruitment Limited | Administrative & support | 2015 |
| Lsak Limited | Wholesale & retail | 2022 |
| Luckky Care Limited | Health & social care | 2024 |
| Lucknow Brickwork & Property Services Ltd | Construction | 2023 |
| Lucky Builder Ltd | Construction | 2019 |
| Lukasz Jarzynka Limited | Transport & logistics | 2019 |
| Luke the Fluke Ltd | Wholesale & retail | 2025 |
| Lydonford Clean Energy LLP | | 2010 |
| Lydonford Limited | Wholesale & retail | 1988 |
| Lydonford Ultra Green LLP | | 2009 |
| Lyra Hardware Limited | Wholesale & retail | 2026 |
| M & G Carpentry Contractors Limited | Construction | 2006 |
| M & I Fabrication (UK) Ltd | Manufacturing | 2019 |
| M Franks Limited | Hospitality | 2022 |
| M K Group Limited | Professional & scientific | 2017 |
| M Precision Grinding Limited | Extraterritorial | 2014 |
| M Supremo Limited | Hospitality | 2026 |
| M&G Foods Ltd | Wholesale & retail | 2024 |
| M&K Trade Limited | Wholesale & retail | 2014 |
| M&P Autobody Repair Centre Ltd | Wholesale & retail | 2024 |
| M&S Homes 25 Ltd | Real estate | 2025 |
| M&S Plumbing & Heating Limited | Construction | 2021 |
| M&S Trim Ltd | Manufacturing | 2020 |
| M.A.S Freightways Ltd | Transport & logistics | 2014 |
| M.C.H. Electrical Systems Limited | Manufacturing | 1984 |
| M.H Healthcare Ltd | Health & social care | 2015 |
| M.K. Electrical Site Services Ltd | Construction | 2016 |
| M.R.P Records Limited | Arts & recreation | 2013 |
| M2 Coaching Limited | Other services | 2026 |
| M2 Housing Group Ltd | Real estate | 2026 |
| M2 Singh Holdings Ltd | Real estate | 2025 |
| M2 Singh Property Ltd | Real estate | 2023 |
| Maakline Limited | Transport & logistics | 2025 |
| Maan Convenience Stores Limited | Wholesale & retail | 2020 |
| Maan Logistics Ltd | Transport & logistics | 2017 |
| MAC Engineering Supplies Ltd | Manufacturing | 2014 |
| Maddys Farm Shop Limited | Wholesale & retail | 2022 |
| Madison Rose Performing Arts CIC | Arts & recreation | 2026 |
| MAG Solicitors Ltd | Professional & scientific | 2014 |
| Magic Laundry Ltd | Other services | 2026 |
| Magndulor Ltd | Other services | 2016 |
| Magrenko Limited | Professional & scientific | 1996 |
| Mahay Solutions Limited | Financial services | 2004 |
| Maher Reynolds Furniture Limited | Manufacturing | 2001 |
| Mahi Developments Ltd | Construction | 2025 |
| Mainline Group Limited | Financial services | 2023 |
| Mainline Haulage Limited | Transport & logistics | 2009 |
| Mainline Property Limited | Real estate | 2009 |
| Maja Consulting Ltd | Information & communication | 2025 |
| Majestic Turkish Flavors Ltd | Hospitality | 2026 |
| Majorcare Ltd | Administrative & support | 2017 |
| Make IT Last Ltd | Wholesale & retail | 2026 |
| Maks & SON Limited | Transport & logistics | 2016 |
| Malh Empire Limited | Transport & logistics | 2025 |
| Malhi Transport (Wolverhampton) Limited | Transport & logistics | 2013 |
| Maliksson Trading Limited | Wholesale & retail | 2024 |
| Malsbridge Care Limited | Health & social care | 2023 |
| Malwa Courier Ltd | Transport & logistics | 2025 |
| Malwa Food Limited | Hospitality | 2026 |
| Mama Brand Limited | Transport & logistics | 2025 |
| Mambo Networks Ltd | Transport & logistics | 2016 |
| Manage Care Limited | Public administration | 2019 |
| Manifestation Designs & Signs Limited | Manufacturing | 2004 |
| Manifestation Designs Limited | Manufacturing | 2025 |
| Mankeert Kaur Limited | Real estate | 2022 |
| Mann & Daughters Limited | Real estate | 2024 |
| Mann I.T. Consultancy Limited | Information & communication | 2022 |
| Mann Logistics 247 Ltd | Construction | 2026 |
| Manni SP Ltd | Real estate | 2024 |
| Manor Dentures Ltd | Manufacturing | 2018 |
| Mantaj Limited | Transport & logistics | 2021 |