| LP Capital Management Ltd | Professional & scientific | 2018 |
| LPF Chelmsford Limited | Wholesale & retail | 2023 |
| LR Accountancy & Business Services Limited | Professional & scientific | 2019 |
| LR Connections Ltd | Professional & scientific | 2018 |
| LR Estate Planning Ltd | Professional & scientific | 2018 |
| LR Financial Services Ltd | Financial services | 2008 |
| LR Interiors Essex Limited | Construction | 2023 |
| LRF Investments Limited | Professional & scientific | 1983 |
| LRH Holdings Ltd | Professional & scientific | 2022 |
| LSR Solutions Limited | Professional & scientific | 2005 |
| LT Lining Supplies Limited | Construction | 2024 |
| LTC Digital Ltd | Information & communication | 2022 |
| LTM Realty Ltd | Real estate | 2025 |
| Lualis Pizza Limited | Hospitality | 2025 |
| Lucalex Solutions Limited | Construction | 2025 |
| Lucas Trade Services Limited | Construction | 2015 |
| Lucca Contracts Limited | Construction | 2019 |
| Lucentum Business Services Limited | Professional & scientific | 2018 |
| Lucky Homes Ltd | Real estate | 2023 |
| Lucky Local Lottery Limited | Information & communication | 2026 |
| Luckymill Private Chef Ltd | Hospitality | 2025 |
| Lucy Can'T Dance Limited | Manufacturing | 2016 |
| Lucy Wilson Limited | Administrative & support | 2026 |
| Lugra Holdings Ltd | Households | 2025 |
| Luigi's Alfresco Limited | Hospitality | 2019 |
| Luiza Gold Limited | Wholesale & retail | 2022 |
| Lukasz Builders Ltd | Construction | 2026 |
| Luke Alexander Limited | Financial services | 2011 |
| Lumina Carr Ltd | Education | 2025 |
| Lumina Medics Ltd | Health & social care | 2025 |
| Lumora Accounting Limited | Professional & scientific | 2025 |
| Lumps Ltd | Information & communication | 2026 |
| Lupent Limited | Administrative & support | 2019 |
| Lush Hospitality Ltd | Hospitality | 2023 |
| Luso Fibre Ltd | Construction | 2023 |
| Luttman & Partners Ltd | Real estate | 2020 |
| LUV ME X Ltd | Wholesale & retail | 2021 |
| Luvitus Limited | Wholesale & retail | 2021 |
| LUX Beauty Spa Ltd | Other services | 2025 |
| LUX Estate Care Ltd | Real estate | 2024 |
| LUX Sports Cars Limited | Wholesale & retail | 2016 |
| Luxe Care Limited | Administrative & support | 2019 |
| Luxscapes Ltd | Administrative & support | 2021 |
| Luxury Porcelain Tiles Limited | Construction | 2021 |
| Luzzu (UK) Ltd | Professional & scientific | 2014 |
| LV House Edit Ltd | Construction | 2018 |
| LWH Consultancy Ltd | Professional & scientific | 2025 |
| LWH Services Limited | Professional & scientific | 2016 |
| Lwlm Coaching Limited | Other services | 2021 |
| LWS Plumbing & Heating (Essex) Limited | Construction | 2015 |
| LXL Interiors Limited | Construction | 2013 |
| Lxssuppliers Ltd | Wholesale & retail | 2025 |
| Lyall Law Group Ltd | Professional & scientific | 2026 |
| Lycian Events (UK) Limited | Administrative & support | 2011 |
| Lynch Property Management Limited | Real estate | 2025 |
| Lynfield Properties Ltd | Real estate | 1957 |
| Lyniq Limited | Administrative & support | 2025 |
| Lynmouth Enterprises Limited | Professional & scientific | 2024 |
| Lynmouth Investments Limited | Real estate | 1954 |
| Lynq Labs Limited | Information & communication | 2025 |
| Lynwood Services Ltd | Construction | 2020 |
| LÁ Closet Ltd | Wholesale & retail | 2023 |
| M & E Property Services and Maintenance Limited | Other services | 2023 |
| M & G Services (Essex) Ltd | Administrative & support | 2025 |
| M & J Brickworks Limited | Construction | 2010 |
| M & P Trading & Importing Ltd | Wholesale & retail | 2012 |
| M & S Kitchens Limited | Construction | 2014 |
| M and M Contracts (Essex) Limited | Construction | 2025 |
| M and M Framing Ltd | Manufacturing | 2018 |
| M Builders & SON Ltd | Construction | 2022 |
| M C L Asset Finance Limited | Financial services | 2012 |
| M C Technical Services (Essex) Ltd | Wholesale & retail | 2024 |
| M Carter Builders Limited | Construction | 2014 |
| M Clark Scaffolding @ Management Services Ltd | Construction | 2023 |
| M Construction & Groundworks Ltd | Construction | 2018 |
| M E C Interiors Ltd | Construction | 2021 |
| M E C Sales Ltd | Wholesale & retail | 2025 |
| M G Douglas Ltd | Construction | 2018 |
| M G Manor Services Limited | Other services | 2018 |
| M G Utilities Ltd | Construction | 2018 |
| M Haeger G P Services Ltd | Health & social care | 2024 |
| M J Kiedish Limited | Professional & scientific | 2012 |
| M L Warwick & SON Properties Ltd | Construction | 2023 |
| M Land Carpentry Ltd | Manufacturing | 2024 |
| M Lucking & Sons Ltd | Other services | 2019 |
| M Madar Ltd | Professional & scientific | 2021 |
| M R W Logistics Limited | Extraterritorial | 2012 |
| M Shield Family Partnership LLP | | 2021 |
| M Shield Management Limited | Financial services | 2021 |
| M Sky Limited | Professional & scientific | 2021 |
| M Spec Services Limited | Construction | 2023 |
| M W (Ipswich) Management Company Limited | Households | 2007 |
| M Wright Utilities Limited | Energy | 2017 |
| M&A Trust Limited | Professional & scientific | 2004 |
| M&B Trades Ltd | Financial services | 2024 |
| M&H Holdings Group Limited | Water & waste | 2023 |
| M&K Real Estate Limited | Real estate | 2020 |
| M&M Estate Management Ltd | Real estate | 2018 |
| M&M Let’S Ltd | Households | 2023 |
| M&M Rhodes Building Ltd | Construction | 2025 |