| Lathom Pastures Residents Management Company Limited | Households | 2023 |
| Laura Designed This Ltd | Professional & scientific | 2020 |
| Lavendon Fields (Olney) Residents Management Company Limited | Households | 2020 |
| Lawrence Grange, Eastwood Management Company Limited | Households | 2025 |
| Lawrence Mill (Eastwood) Management Company Limited | Households | 2020 |
| Lawrenson Ball Limited | Real estate | 2022 |
| Lawton Green (Alsager) Management Company Limited | Households | 2018 |
| LAY Site Ltd | Construction | 2016 |
| Lbcb Enterprises Ltd | Information & communication | 2016 |
| LE Brocq Associates Limited | Professional & scientific | 2010 |
| LE Petit Monde Limited | Professional & scientific | 2010 |
| Leadersmiths Limited | Administrative & support | 2016 |
| Leanne Lorains Strategy Ltd | Professional & scientific | 2023 |
| Legawin Ltd | Wholesale & retail | 2025 |
| Leisure Referrals Ltd | Wholesale & retail | 2022 |
| Lensar Holdings Limited | Construction | 2016 |
| Lensar Properties Limited | Real estate | 2022 |
| Leonard’S Letting Limited | Households | 2025 |
| Leslie Homes (Aston) Limited | Construction | 2020 |
| Leslie Homes (Church Street) Ltd | Construction | 2024 |
| Leslie Homes (Piper) Limited | Real estate | 2020 |
| Leslie Homes Limited | Construction | 2013 |
| Leslie Homes the Green Limited | Real estate | 2024 |
| Leslie Investment Properties Limited | Real estate | 2020 |
| Level 4 Developments Limited | Real estate | 2025 |
| Lewis Fellows Property Limited | Real estate | 2021 |
| LF Book Services Limited | Manufacturing | 2016 |
| LG Property Development and Services Limited | Wholesale & retail | 2010 |
| Liftd Lifestyle Ltd | Arts & recreation | 2023 |
| Lighthouse Real Estate Limited | Real estate | 2022 |
| Linley Grange Phase 2 Resident Management Company Limited | Households | 2023 |
| Lisa Williamson Competition Livery Limited | Arts & recreation | 2022 |
| Lisa Williamson Racing Limited | Arts & recreation | 2007 |
| Litecone LED Limited | Wholesale & retail | 2012 |
| Little Escapes Limited | Administrative & support | 2026 |
| Little Owls Learning Ltd | Wholesale & retail | 2020 |
| Little Planet Media Limited | Information & communication | 1997 |
| Little Sytems Ltd. | Hospitality | 2015 |
| Live the Beat Ltd | Education | 2024 |
| Livestock Supplies Limited | Agriculture & fishing | 2003 |
| Liza Hardstaff Limited | Administrative & support | 2017 |
| Ljsa Ltd | Professional & scientific | 2018 |
| Lloyd Power Services Ltd | Construction | 2023 |
| Lloydc Limited | Real estate | 2015 |
| Llwyn Nant Management Company Limited | Households | 2025 |
| Llys Y Coed (Rhosrobin) Management Company Ltd | Households | 2023 |
| LMD Management Consultancy Limited | Professional & scientific | 2009 |
| Lochsons Ltd | Real estate | 2020 |
| Locksley Developments Ltd | Other services | 2025 |
| Logistic Services Ltd | Transport & logistics | 2024 |
| Longford Manor (Long Lawford) Management Company Limited | Households | 2020 |
| Lorton Park Management Company Limited | Real estate | 2016 |
| Lottie Gardens (Bebington) Residents Management Company Limited | Households | 2026 |
| Lottie Gardens Maisonettes (Bebingon) Residents Management Company Limited | Households | 2026 |
| Loved Hair & Beauty Ltd | Other services | 2024 |
| Lovol Limited | Wholesale & retail | 2015 |
| LT Law Limited | Professional & scientific | 2016 |
| LT Lettings Limited | Real estate | 2015 |
| LTI Member Services Ltd | Other services | 2011 |
| Luciddoor UK Limited | Manufacturing | 2026 |
| Luke Johnson Limited | Information & communication | 2025 |
| Lupo Property Services Limited | Real estate | 2019 |
| Luxe Lashes Formby Limited | Wholesale & retail | 2024 |
| Luxe Lashes Limited | Other services | 2017 |
| Lydiate Gate Residents Management Company Limited | Households | 2023 |
| Lyndant Properties Ltd | Construction | 2024 |
| Lyneham Fields Resident Management Company Limited | Households | 2023 |
| M Downes Earthworks Ltd | Construction | 2015 |
| M Downes Group Holding Ltd | Financial services | 2024 |
| M. Rogers Transport Limited | Transport & logistics | 2006 |
| Macdonald Joinery Ltd | Manufacturing | 2022 |
| Maclaren Fine Wines Ltd | Wholesale & retail | 2023 |
| Maclaren Studios Limited | Arts & recreation | 2022 |
| Macpac (Bredbury) Limited | Financial services | 1972 |
| Madeley and Statham Limited | Professional & scientific | 2021 |
| Madryn Holiday Park Limited | Hospitality | 2025 |
| Maes Y Castell (Residents) Management Company Limited | Households | 2026 |
| Maes Y Rhedyn Fern Meadow Residents Management Company Limited | Households | 2019 |
| Maes YR Haul (ST Asaph) Management Company Limited | Households | 2022 |
| Mahulu Limited | Wholesale & retail | 2025 |
| Mainwaring Gardens Management Company Limited | Households | 2013 |
| Majorstage Limited | Hospitality | 1998 |
| Makin and Makin Consultancy Limited | Professional & scientific | 2007 |
| Mamuci Creative Ltd | Professional & scientific | 2011 |
| Manava Collection Limited | Manufacturing | 2021 |
| Manor Farm Barns CW6 Ltd | Households | 2023 |
| Manor Gardens (Rhostyllen) Residents Management Company Limited | Households | 2023 |
| Manor House Cleaning Ltd | Administrative & support | 2021 |
| Marco Polo Events Limited | Arts & recreation | 2016 |
| Marco Polo Holdings Limited | Other services | 2020 |
| Marsh Machinery Ltd | Manufacturing | 2017 |
| Marshmallow Media Group Limited | Information & communication | 2023 |
| Marske Sands and Beaconfield Rise Residents Management Company Limited | Households | 2024 |
| Marwood Property Consultancy Ltd | Real estate | 2019 |
| Mary's Meadow (Blackfordby) Management Company Limited | Households | 2022 |
| Mash Planning and Careers Ltd | Administrative & support | 2016 |
| Massey Hallows UK Ltd | Wholesale & retail | 2025 |
| Massey Place (Hilton) Management Company Limited | Households | 2021 |
| Maude Construction Limited | Construction | 2006 |
| MAX RAW Ltd | Wholesale & retail | 2025 |