| Larger London Land Company Limited | Real estate | 1906 |
| Larry Allen Consulting Limited | Information & communication | 2010 |
| Last 9 Yards Ltd | Professional & scientific | 2025 |
| Lastminute Personnel Limited | Administrative & support | 2005 |
| Lastminutemusicians.Com Limited | Arts & recreation | 2008 |
| Laundry Lane Management Company Limited | Professional & scientific | 1991 |
| Laura Ellen Architecture Ltd | Extraterritorial | 2019 |
| Lauren Matthews Home Ltd | Wholesale & retail | 2022 |
| Laventher Holdings Limited | Real estate | 2025 |
| Lavish Residential Ltd | Hospitality | 2024 |
| Law 873 Limited | Professional & scientific | 1997 |
| Lawrence Machinery Limited | Real estate | 1982 |
| LB Lifestyle Limited | Other services | 2022 |
| LCN Smart Ltd | Construction | 2019 |
| LD91 Ltd | Financial services | 2018 |
| LE Aricot Limited | Real estate | 2025 |
| LE BON Cadeau Ltd | Wholesale & retail | 2015 |
| Leap Into Consulting Ltd | Extraterritorial | 2023 |
| Leap Into HR Consulting Ltd | Extraterritorial | 2023 |
| Leap Performance Ltd | Administrative & support | 2001 |
| Learning Dynamics Limited | Education | 1997 |
| Leelands Management Company (Lymington) Limited | Households | 1973 |
| Lemana Place (Lymington) Management Company Limited | Households | 2013 |
| Lemaria Ltd | Health & social care | 2024 |
| Lentune Manufacturing Limited | Manufacturing | 2014 |
| Leoma James Retail Ltd | Wholesale & retail | 2025 |
| Leonardi Estates Ltd | Real estate | 2025 |
| Let's Talk Communications Limited | Professional & scientific | 2019 |
| Lets 2 U Ltd | Real estate | 2019 |
| Letterprint Limited | Real estate | 1984 |
| Lewis Properties (1985) Limited | Real estate | 1985 |
| Lexeli Ltd | Professional & scientific | 2025 |
| LG Therapy Services Limited | Professional & scientific | 2014 |
| Liaise Consultancy Limited | Real estate | 1998 |
| Licensing Management International Limited | Administrative & support | 1982 |
| Lightfoot Plastic Fabrication Limited | Manufacturing | 2025 |
| Lightfoot Property Limited | Real estate | 2016 |
| Lighthouse Brand Marketing Limited | Professional & scientific | 2015 |
| Lights Camera Code Ltd | Wholesale & retail | 2018 |
| Lillie Lawrence Ltd | Wholesale & retail | 2025 |
| Limeview Developments Limited | Construction | 1996 |
| Lindsay Wood Promotions Limited | Information & communication | 1989 |
| Link Into Consulting Ltd | Other services | 2025 |
| Link Into HR Consulting Ltd | Other services | 2025 |
| Link-Ages Tech Limited | Information & communication | 2016 |
| Little Arnewood House (Sway) Limited | Households | 1962 |
| Little Blue Door Properties Ltd | Real estate | 2015 |
| Little Everest Investments Limited | Construction | 2023 |
| Little Testwood Property Management Ltd | Real estate | 2025 |
| Live and Kicking Ltd | Information & communication | 2008 |
| Living Beautifully by Lynn Barnes Limited | Professional & scientific | 2024 |
| Livingstone Services Limited | Construction | 2025 |
| LIZ Young Golf Limited | Arts & recreation | 2022 |
| Lloyd Images Ltd | Arts & recreation | 2011 |
| Lock IT & Leave IT LLP | | 2024 |
| Lodestar People Ltd | Professional & scientific | 2026 |
| Londesborough Place Management Company Limited | Real estate | 2005 |
| London Stone Restoration Co. Limited | Construction | 1989 |
| Long Acre Farm CL Ltd | Hospitality | 2021 |
| Looking Glass Films Limited | Information & communication | 1995 |
| Lotech Ltd | Wholesale & retail | 2024 |
| Lotteries Limited | Information & communication | 2004 |
| Lowrie Studios Limited | Professional & scientific | 2016 |
| Lowtina Ltd | Wholesale & retail | 2024 |
| LTM Sailing Ltd | Arts & recreation | 2012 |
| Lucid Planning Limited | Professional & scientific | 2016 |
| Lush Hair and Beauty Salon Ltd | Other services | 2012 |
| Lymedale Management Company Limited | Households | 2021 |
| Lymington Amateur Rowing Club Ltd | Arts & recreation | 2025 |
| Lymington and District Chamber of Commerce & Industry Limited | Other services | 2003 |
| Lymington Auto Services Limited | Wholesale & retail | 2017 |
| Lymington Baptist Developments Ltd | Construction | 2025 |
| Lymington Brickwork Limited | Construction | 2019 |
| Lymington Bridge Club Ltd | Arts & recreation | 2008 |
| Lymington Community Rental Company Ltd | Real estate | 2026 |
| Lymington Design Associates Limited | Real estate | 1984 |
| Lymington Directory Limited | Information & communication | 2017 |
| Lymington Fresh Fish and Deli Limited | Hospitality | 2018 |
| Lymington Holdings Limited | Financial services | 2017 |
| Lymington Hospital Friends | Health & social care | 1998 |
| Lymington Investments Limited | Real estate | 1978 |
| Lymington Land Company Ltd | Real estate | 2020 |
| Lymington Marina Community Rental Company Ltd | Real estate | 2026 |
| Lymington Marine (Electronics) Ltd | Wholesale & retail | 2023 |
| Lymington Marine (Technical Services) Limited | Wholesale & retail | 2023 |
| Lymington Mobiles Ltd | Wholesale & retail | 2025 |
| Lymington Nails Ltd | Other services | 2023 |
| Lymington Plumbing Limited | Construction | 2015 |
| Lymington Quay Hospitality Limited | Hospitality | 2026 |
| Lymington Restoration Limited | Professional & scientific | 2000 |
| Lymington Sea School Ltd | Education | 2021 |
| Lymington Taxis Limited | Transport & logistics | 2021 |
| Lymington Town Sailing Club Limited | Arts & recreation | 1961 |
| Lymington Valeting Centre Ltd | Wholesale & retail | 2021 |
| Lymington Windows & Conservatories Limited | Construction | 2006 |
| Lymore Grove Management Limited | Households | 2019 |
| Lymore Home Improvements Ltd | Construction | 2020 |
| Lymore Ltd | Construction | 2023 |
| Lymore Retreats Ltd | Hospitality | 2019 |
| Lynian Logistics Limited | Transport & logistics | 2007 |