| Loxley Jewellers Limited | Manufacturing | 2025 |
| LP Consulting Ltd | Administrative & support | 2025 |
| LP Heating & Plumbing Ltd | Construction | 2018 |
| LPB Contracting Ltd | Administrative & support | 2019 |
| LPJ Construction Ltd | Construction | 2017 |
| LPM F&S Ltd | Construction | 2025 |
| LRA Data Ltd | Information & communication | 2024 |
| LRI Exports Ltd | Wholesale & retail | 2020 |
| LRM Consultants (UK) Limited | Professional & scientific | 2023 |
| LS Property Services (Hampshire) Ltd | Construction | 2019 |
| LS Surfacing Solutions Ltd | Construction | 2021 |
| LSF Renovations Ltd | Construction | 2026 |
| LSK Group Ltd | Professional & scientific | 2024 |
| LSN Fire & Management Consultants Ltd | Public administration | 2019 |
| LSO Asset Holdings Ltd | Real estate | 2026 |
| LSO Design Ltd | Information & communication | 2024 |
| LT Engineering Limited | Construction | 2022 |
| Lucent Leases Limited | Real estate | 2024 |
| Luckie Contracting Ltd | Construction | 2017 |
| Lucky S Denmead Limited | Hospitality | 2015 |
| Lucy Clipsham Limited | Professional & scientific | 2020 |
| Ludcombe Extension Management Company Limited | Households | 1999 |
| Ludmore Barns Ltd | Construction | 2024 |
| Luena Gama Ltd | Arts & recreation | 2024 |
| LUI Services Ltd | Financial services | 2006 |
| Luke Hancock Consultancy Ltd | Construction | 2023 |
| Luke Tumber Stunt Productions Ltd | Arts & recreation | 2017 |
| Lume Wellness Ltd | Health & social care | 2025 |
| Luna Blue Consultancy Ltd | Professional & scientific | 2024 |
| Lunalight Stays Ltd | Real estate | 2024 |
| Lundi Architects Ltd | Professional & scientific | 2021 |
| Lures Edge Ltd | Wholesale & retail | 2022 |
| LUX Benedicta Group Ltd | Wholesale & retail | 2026 |
| LUX PUP Digital Ltd | Professional & scientific | 2022 |
| Luxe Collaborative Ltd | Administrative & support | 2024 |
| Luxe Interior Build Limited | Households | 2025 |
| LVT Vinyl & Carpet Company Ltd | Construction | 2017 |
| LWW Interim Services Limited | Professional & scientific | 2025 |
| LX3 Investments Ltd | Construction | 2015 |
| LYA 29 Ltd | Transport & logistics | 2018 |
| Lyne Technologies Limited | Information & communication | 2021 |
| Lynes Commercial Services Limited | Other services | 2018 |
| Lynx Aerospace Ltd | Manufacturing | 2016 |
| Lyvein Ltd | Construction | 2024 |
| M & H Properties and Development Limited | Construction | 2024 |
| M & J Auto Refurbishment Ltd | Wholesale & retail | 2025 |
| M & J Carpentry Limited | Construction | 2007 |
| M & P Fredman Limited | Financial services | 2014 |
| M & S Davison Limited | Real estate | 2016 |
| M a GEE Carpentry Holdings Limited | Financial services | 2018 |
| M a GEE Carpentry Services Limited | Construction | 2006 |
| M a Housing Ltd | Real estate | 2017 |
| M a Woolford Plastering Specialists Limited | Construction | 2017 |
| M B Direct GAS Limited | Construction | 2014 |
| M B Painting & Decorating Services Limited | Construction | 2017 |
| M C ENG. SVS. Ltd | Manufacturing | 2010 |
| M C Flooring Contractors Ltd | Construction | 2008 |
| M Chapman Plastering Ltd | Construction | 2017 |
| M Forfar Limited | Construction | 2016 |
| M G P Installations Ltd | Construction | 2023 |
| M G Rail Limited | Transport & logistics | 2014 |
| M H Surfacing Limited | Construction | 2012 |
| M I S Consulting Limited | Professional & scientific | 2010 |
| M J Lifting Limited | Construction | 2017 |
| M J Martin Builders Limited | Administrative & support | 2002 |
| M Kilford Services Limited | Wholesale & retail | 2014 |
| M L D Rail Solutions Limited | Transport & logistics | 2020 |
| M L Engineering & Repairs Limited | Manufacturing | 2021 |
| M M Maintenance Limited | Construction | 2002 |
| M P C Construction Services Limited | Construction | 2021 |
| M P Roofing Solutions Ltd | Construction | 2023 |
| M Pearce Projects Ltd | Transport & logistics | 2014 |
| M Plus Media Ltd | Information & communication | 2022 |
| M TEC Walling Limited | Construction | 2008 |
| M&D Property Management (Southern) Limited | Real estate | 2019 |
| M&E Metal Solutions Ltd | Water & waste | 2025 |
| M&E Teck Facilities Limited | Construction | 2021 |
| M&G Roofing Services Limited | Construction | 2024 |
| M&M Tournaments Ltd | Arts & recreation | 2024 |
| M&S Electrical Contractors Limited | Construction | 2023 |
| M&S Roofing Services Ltd | Construction | 2018 |
| M&Z Construction Services Limited | Construction | 2023 |
| M-1 Elite Labour Services Limited | Construction | 2023 |
| M.A.S Professional Services Ltd | Construction | 2026 |
| M.Dearing Property Services Ltd | Construction | 2020 |
| M.E. Consulting Group Limited | Professional & scientific | 2024 |
| M.J. Bailey Limited | Agriculture & fishing | 2011 |
| M.T.E Plant Services Ltd | Manufacturing | 2025 |
| M/D Payne Roofing Limited | Construction | 2015 |
| M0RKSPORT Ltd | Professional & scientific | 2024 |
| M20 Consultancy Limited | Information & communication | 2022 |
| M3 Brothers Housing Ltd | Real estate | 2019 |
| M3 Marine (Offshore Brokers) UK Ltd | Wholesale & retail | 2023 |
| M6B Ltd | Information & communication | 2018 |
| MA Consultancy (Southern) Ltd | Professional & scientific | 2019 |
| Maacann Ltd | Wholesale & retail | 2011 |
| Maaw Developments Ltd | Real estate | 2022 |
| Mac-Denzi Limited | Wholesale & retail | 2022 |
| Macaulay Plumbing Maintenance Ltd | Construction | 2019 |
| Mackai Contracts Limited | Construction | 2005 |