| LDV Developments Ltd | Extraterritorial | 2010 |
| Leadatom Europe Limited | Manufacturing | 1988 |
| Leanne Nails Ltd | Other services | 2024 |
| LED Lighting Maintenance Limited | Construction | 2016 |
| LED Live Limited | Administrative & support | 2014 |
| LED Plus Lighting Ltd | Wholesale & retail | 2022 |
| Led-Lighting (Europe) Limited | Construction | 2013 |
| Ledmall Ltd | Wholesale & retail | 2025 |
| LEE Aitken Property Developments Ltd | Construction | 2022 |
| Legacy Investments South Limited | Real estate | 2024 |
| Leon Poultney Limited | Arts & recreation | 2014 |
| Lezabry Impex Ltd | Wholesale & retail | 2025 |
| LG Rail Management & Consultancy Ltd | Construction | 2025 |
| Lhutchisonpubs Limited | Hospitality | 2023 |
| Lifetime Construction Limited | Construction | 1993 |
| Lifetime Construction UK Ltd | Construction | 2009 |
| Lifetime Housing Limited | Construction | 2004 |
| Lifetime Ventures Ltd | Professional & scientific | 1998 |
| Light Beam Properties Ltd | Real estate | 2020 |
| Lighthouse Learning Trust | Education | 2017 |
| Liionstore Limited | Energy | 2018 |
| Lilac and Grace Ltd | Wholesale & retail | 2019 |
| Limitless Loops FLY Casting Ltd | Agriculture & fishing | 2022 |
| Linen Hire and Laundry Ltd | Other services | 2025 |
| Lingap Limited | Health & social care | 2014 |
| Lipspeaker UK Ltd | Professional & scientific | 2016 |
| Little Furs Cattery (Gosport) Ltd | Other services | 2019 |
| Littlewilds Limited | Education | 2024 |
| Liudu Limited | Health & social care | 2024 |
| LIZ Stevens Pilates Ltd | Arts & recreation | 2026 |
| LJ Osborne Limited | Financial services | 2024 |
| LJC (Gosport) Limited | Information & communication | 1986 |
| LKS Property Management Services Limited | Real estate | 2018 |
| LMW Phelps Ltd | Hospitality | 2023 |
| Locknleave Limited | Real estate | 2019 |
| Lodge Gardens Residents Association Limited(The) | Households | 1967 |
| Logiwave IT Ltd | Wholesale & retail | 2026 |
| Lollipop Logistics Ltd | Wholesale & retail | 2023 |
| Lonrho Agribusiness Zimbabwe (U.K.) Limited | Financial services | 1924 |
| Lorne Booker Ltd | Extraterritorial | 2024 |
| Loxley Enterprise Limited | Wholesale & retail | 2022 |
| LP Composites Ltd | Manufacturing | 2023 |
| LP Heating & Plumbing Services Limited | Construction | 2022 |
| LPC Capital Ltd | Financial services | 2023 |
| LPS Security Solutions Ltd | Administrative & support | 2012 |
| LTH Southern Ltd | Construction | 2021 |
| Lucaisie Limited | Information & communication | 2015 |
| Lucky Star (Gosport) Ltd | Hospitality | 2015 |
| Lucy's Garage Ltd | Wholesale & retail | 2017 |
| Luke Capital Homes Ltd | Real estate | 2026 |
| Luminova Solutions Ltd | Other services | 2023 |
| LUX Aura Jewelry Ltd | Manufacturing | 2025 |
| LUX Marine Ltd | Manufacturing | 2023 |
| Luxgate Ltd | Wholesale & retail | 2025 |
| Luxx Eternal Limited | Arts & recreation | 2026 |
| LW Home Developments Limited | Construction | 2024 |
| LYC (Rowner) Limited | Hospitality | 2011 |
| M and M Rubber Roofing Limited | Construction | 2011 |
| M C Heating Ltd | Construction | 2018 |
| M D M (Southern) Limited | Real estate | 2025 |
| M Nicholls Catering Ltd | Hospitality | 2019 |
| M Squared Control Systems Ltd | Manufacturing | 2013 |
| M Squared Defence Ltd | Manufacturing | 2023 |
| M White Construction Ltd | Construction | 2024 |
| M&M GAS Services (Southern) Ltd | Construction | 2015 |
| M-Pire Management Limited | Real estate | 2016 |
| M.O Aviation Ltd | Manufacturing | 2020 |
| M.W. Building and Groundworks Services Ltd | Construction | 2023 |
| Machine Tool and Engineering Services Limited | Manufacturing | 1993 |
| MAD Lets Holdings Limited | Financial services | 2023 |
| Maeflower Accounting CIC | Professional & scientific | 2026 |
| Maeflower Bookkeeping Ltd | Professional & scientific | 2024 |
| Magenta Data Services Ltd | Administrative & support | 2014 |
| Magic Motors Gosport Ltd | Wholesale & retail | 2017 |
| Magnifex Limited | Information & communication | 2025 |
| Mahalingeswarar CIC | Other services | 2026 |
| Maid to a Lady Limited | Wholesale & retail | 2018 |
| Main Fire Sprinkler Systems Limited | Professional & scientific | 2018 |
| Maison Mist Cleaning Ltd | Administrative & support | 2026 |
| Make Hair Magic Ltd | Other services | 2020 |
| Making Things Studio Limited | Manufacturing | 2019 |
| Malcolm Goodwin Limited | Real estate | 2023 |
| Mamba Properties Limited | Real estate | 2019 |
| Mano Services Ltd | Transport & logistics | 2024 |
| Manson Electrical Limited | Construction | 2025 |
| Manson Property Resources Ltd | Real estate | 2024 |
| Marcus Mulberry Ltd | Wholesale & retail | 2025 |
| Marina Lodge South Coast Limited | Extraterritorial | 2023 |
| Marine Advertising Agency Limited | Professional & scientific | 2009 |
| Marine Decking Solutions Limited | Administrative & support | 2009 |
| Marine Industry News Limited | Information & communication | 2023 |
| Marine Rigging Services Ltd | Manufacturing | 2022 |
| Maritime Heritage Tours Ltd | Administrative & support | 2016 |
| Maritime Services (International) Limited | Professional & scientific | 1990 |
| Maritime Training Academy Limited | Education | 2012 |
| Maritime Workshop (the) | Construction | 1984 |
| Mark & Oliver (UK) Ltd | Other services | 2013 |
| Mark and Simon Limited | Real estate | 2011 |
| Marka Holdings Limited | Real estate | 2023 |
| Marquivity Media Ltd | Professional & scientific | 2025 |