| Life IS Digital Ltd | Information & communication | 2025 |
| Light Hearted Limited | Wholesale & retail | 2012 |
| Lighting Junky Limited | Energy | 2018 |
| Lighting Reality Limited | Information & communication | 1995 |
| Lili Italia L1 Ltd | Hospitality | 2024 |
| Lillywhite Consulting Ltd | Administrative & support | 2025 |
| Limboshot Ltd | Administrative & support | 2019 |
| Limbrick Consultancy LLP | | 2018 |
| Lincomb Driveways Ltd | Construction | 2019 |
| Linden Tree Arts Limited | Wholesale & retail | 2019 |
| Lindsey Dyke Consultancy Limited | Public administration | 2025 |
| Lingard Construction Ltd | Construction | 2023 |
| Lingard Security Sevices Ltd | Administrative & support | 2023 |
| Lintel Investments Ltd | Professional & scientific | 2024 |
| Linzia Ltd | Transport & logistics | 2025 |
| Lionfitclothinguk Limited | Wholesale & retail | 2022 |
| Liquona Ltd | Information & communication | 2012 |
| Litefirst Ltd | Information & communication | 2019 |
| Little Bantam Ltd | Professional & scientific | 2021 |
| Little Chalfont Ltd | Administrative & support | 2021 |
| Little Litter Warriors Limited | Education | 2020 |
| Little Longstone Ltd | Transport & logistics | 2021 |
| Little Melton Ltd | Health & social care | 2022 |
| Little Moors Farm Ltd | Health & social care | 2019 |
| Little Trinity Limited | Education | 2014 |
| Liumshev Ltd | Administrative & support | 2024 |
| Live Wires Electrical & Property Maintenance Limited | Construction | 2010 |
| Livean Limited | Administrative & support | 2019 |
| Livioxium Ltd | Health & social care | 2024 |
| Lizben White Ltd | Hospitality | 2025 |
| LJC Install and Design Limited | Professional & scientific | 2025 |
| LJS Ventures Ltd | Professional & scientific | 2026 |
| LK Hair Design Ltd | Other services | 2017 |
| LKP Solutions Ltd | Construction | 2025 |
| Llanddewi Skirrid Ltd | Administrative & support | 2022 |
| Llandevaud Ltd | Transport & logistics | 2022 |
| Llanybydder Ltd | Wholesale & retail | 2021 |
| LMG Pictures Limited | Information & communication | 2015 |
| Local LAD Recovery Ltd | Transport & logistics | 2025 |
| Lockett Plant Hire & Groundwork's Limited | Construction | 2020 |
| Lola+Me Ltd | Other services | 2022 |
| Longwood Lodge Care Home Ltd | Health & social care | 2025 |
| Lookoutsafety Ltd | Public administration | 2022 |
| Loom-Tech Limited | Manufacturing | 2008 |
| Lorin Arnold Architecture Ltd | Professional & scientific | 2024 |
| Loughborough Pharmacy Limited | Wholesale & retail | 2015 |
| Louis Lampard Films Ltd | Information & communication | 2026 |
| Louise Mcelroy- Gray Ltd | Health & social care | 2017 |
| Love Street Limited | Professional & scientific | 2025 |
| Lovee Joy Limited | Wholesale & retail | 2024 |
| Loves FX Limited | Financial services | 2026 |
| Loves Heating Ltd | Construction | 2020 |
| Lower Park Ltd | Administrative & support | 2021 |
| Lower Street Garage (2016) Limited | Wholesale & retail | 2016 |
| Lowerbourne Limited | Wholesale & retail | 2024 |
| LQ Cole Ltd | Administrative & support | 2021 |
| LR (Midlands) Ltd | Construction | 2023 |
| LRG Furniture Ltd | Wholesale & retail | 2023 |
| Lrtt Limited | Education | 2003 |
| Lucas's Company Ltd | Construction | 2025 |
| Lucky 13 Competitions Limited | Arts & recreation | 2024 |
| Lucy Bates Children's Occupational Therapy Limited | Health & social care | 2020 |
| Lucy P Ltd | Arts & recreation | 2014 |
| Ludlow Rugby Football Club Limited | Administrative & support | 2015 |
| Luna Fitness Ltd | Arts & recreation | 2021 |
| Lupin Works Management Company Limited | Households | 1989 |
| Lush and Lavish by Lisa Ltd | Wholesale & retail | 2020 |
| Lushill Ltd | Administrative & support | 2021 |
| Luxe Auto Care Ltd | Wholesale & retail | 2025 |
| Luxe Management Group of Companies Ltd | Administrative & support | 2025 |
| Luxehaven Global Ltd | Other services | 2025 |
| Luxury Co 24 Limited | Wholesale & retail | 2024 |
| Luxury Nails & Spa Beauty Ltd | Other services | 2022 |
| LWD Consultancy Services Ltd | Professional & scientific | 2023 |
| LY Guest Ltd | Administrative & support | 2022 |
| Lycett Limited | Real estate | 2023 |
| Lyechris Solutions Limited | Administrative & support | 2025 |
| LYS Contractors Ltd | Construction | 2021 |
| M & M Timber Limited | Professional & scientific | 2001 |
| M & P Dairies Limited | Other services | 2002 |
| M and M Antiques Limited | Wholesale & retail | 2024 |
| M D Caravan Services Limited | Administrative & support | 2026 |
| M Dorrell Electrical Ltd | Construction | 2022 |
| M G Sportswear Holdings Limited | Financial services | 2026 |
| M G Sportswear Leisure Limited | Wholesale & retail | 2003 |
| M G Sportswear Limited | Wholesale & retail | 1997 |
| M J Performance Parts Ltd | Wholesale & retail | 2025 |
| M K Body Repairs Limited | Wholesale & retail | 2017 |
| M Morris Contracting Limited | Agriculture & fishing | 2024 |
| M O & S I T Tucker Limited | Construction | 2019 |
| M Rizos Limited | Transport & logistics | 2015 |
| M W Property Services (Kidderminster) Ltd | Households | 2021 |
| M. Bennett Groundworks Limited | Construction | 2015 |
| M.J.W. Electrics Limited | Construction | 2005 |
| M.T.C.R Marketing Holdings Limited | Professional & scientific | 2017 |
| M.T.C.R. Marketing Limited | Wholesale & retail | 1983 |
| M.T.L. Engineering Limited | Manufacturing | 2003 |
| M.V.Products Limited | Manufacturing | 1999 |
| Maatt Ltd | Transport & logistics | 2026 |
| Macace Communications Ltd | Information & communication | 2020 |