| Lapstone Limited | Hospitality | 2026 |
| Laraine Bryant Limited | Health & social care | 2014 |
| Larcc Limited | Wholesale & retail | 2024 |
| Larchwood Construction Ltd | Construction | 2019 |
| Larkhall Construction Ltd | Construction | 2017 |
| Laser Light UK Skin Clinics Ltd | Other services | 2026 |
| Latchwood Motors Ltd | Wholesale & retail | 2023 |
| Latimer Walk Management Limited | Households | 2016 |
| Latitude Residents NO 3 Limited | Households | 2017 |
| Lavendula Landscapes Ltd | Administrative & support | 2023 |
| Law King Limited | Professional & scientific | 2017 |
| Law Lexicon Ltd | Professional & scientific | 2024 |
| Lawinvest Limited | Extraterritorial | 2010 |
| Lawrence Lake Recruitment Solutions Limited | Professional & scientific | 2015 |
| Lawturn Major Ltd. | Real estate | 2002 |
| Lazer JET Ltd | Information & communication | 2019 |
| LB Carpentry Hampshire Ltd | Construction | 2026 |
| LB Copywriting Limited | Professional & scientific | 2022 |
| LBC Trading Ltd | Wholesale & retail | 2025 |
| LC Global Goods Ltd | Wholesale & retail | 2025 |
| Lcoa Limited | Real estate | 2024 |
| LEADERS4LEARNING Limited | Education | 2013 |
| Leadership Vision Limited | Professional & scientific | 2022 |
| Leading Practice Ltd | Professional & scientific | 2022 |
| Leadmaker Services Limited | Wholesale & retail | 2003 |
| Leaf Homes Ltd | Construction | 2000 |
| Leanne Edwards Property Ltd | Real estate | 2022 |
| Learning & Assessment Services Limited | Professional & scientific | 2019 |
| Learning Through Sport Limited | Arts & recreation | 2006 |
| Lebourn Transport Services Ltd | Transport & logistics | 2018 |
| Ledger Accounting Holding Limited | Financial services | 2021 |
| Ledger Accounting Services Limited | Professional & scientific | 2011 |
| LEE Fire and Security Limited | Administrative & support | 1983 |
| LEE Peck Media Limited | Professional & scientific | 2014 |
| Leela CF Limited | Other services | 2018 |
| Legacy by FAJ Ltd | Professional & scientific | 2025 |
| Leigh Farm Limited | Agriculture & fishing | 2015 |
| Leiluca Limited | Manufacturing | 2025 |
| Leisure Asset Management Limited | Professional & scientific | 1984 |
| Lekh Construction and Building Management Services Ltd | Construction | 2020 |
| Lenten Street Limited | Real estate | 2025 |
| Lets Training Ltd | Education | 2023 |
| Levelo Management Company Limited | Households | 2026 |
| Lewarc Holdings Limited | Financial services | 2023 |
| Lewis Digital Ltd | Information & communication | 2017 |
| Lewis Electrical Southern Limited | Construction | 2026 |
| Lewis Games Ltd | Wholesale & retail | 2020 |
| Leyden House Management Company Limited | Households | 2003 |
| LGR Bradshaw Limited | Real estate | 2021 |
| Lgrs Services Ltd | Construction | 2015 |
| LHH Management Limited | Hospitality | 2024 |
| Libertas Incepta UK Ltd | Real estate | 2025 |
| Liberty Court Chandlers Ford Management Company Limited | Households | 2010 |
| Libreo Properties Limited | Real estate | 2018 |
| Life Advantage Limited | Other services | 2016 |
| Life and Soul International Limited | Arts & recreation | 2018 |
| Life Decisions Limited | Extraterritorial | 2024 |
| Life Journal Ltd | Professional & scientific | 2016 |
| Lifeboat Associates Limited | Professional & scientific | 2022 |
| Lifeboat Group Ltd | Professional & scientific | 2024 |
| Lifeboat Holding Limited | Professional & scientific | 2025 |
| Liftability (Holdings) Limited | Professional & scientific | 2014 |
| Liftech Electrical Limited | Construction | 2019 |
| Liftech Systems (SE) Limited | Manufacturing | 2003 |
| Lifting Equipment Training Services Limited | Education | 2006 |
| Light Work Accounting Ltd | Professional & scientific | 2018 |
| Light Work Forex Ltd | Financial services | 2021 |
| Light Work HR and Payroll Services Ltd | Administrative & support | 2021 |
| Lighthouse Construction (Southern) Limited | Construction | 2024 |
| Lightwork Electrical Ltd | Construction | 2016 |
| Lilachelene Limited | Wholesale & retail | 2014 |
| Lily's Garden Eastleigh Ltd | Hospitality | 2018 |
| Lily's Inn 2026 Limited | Hospitality | 2026 |
| Lime Juice Web Design Limited | Information & communication | 2017 |
| Lime Wood Holdings Ltd | Real estate | 2023 |
| Lime Wood Media Ltd | Information & communication | 2018 |
| Limelight Collection Ltd | Information & communication | 2024 |
| Limelight Holdings Ltd | Financial services | 2024 |
| Limesigns Limited | Administrative & support | 2007 |
| Limestone Mortgages Ltd | Administrative & support | 2017 |
| Limitless Renewables Ltd | Construction | 2023 |
| Lindsey Revell Podiatry Limited | Health & social care | 2015 |
| Linguere Ltd | Transport & logistics | 2026 |
| Link 2 Link Comms Limited | Information & communication | 2021 |
| Linking Humans Limited | Administrative & support | 2016 |
| Linkup Global Limited | Other services | 2013 |
| Lion Commercial Cleaning Ltd | Administrative & support | 2007 |
| Lion Lane Developments Limited | Construction | 2024 |
| Lionheart (Bursledon) Management Company Limited | Households | 1982 |
| Lipc Partnership Limited | Education | 2014 |
| Lipizzaner Autos Ltd | Wholesale & retail | 2024 |
| Liquid Assets Bar Management Ltd | Hospitality | 2019 |
| Liquid Brands Consulting Limited | Other services | 2019 |
| Little 1 Property Limited | Real estate | 2019 |
| Little Bird Lettings Limited | Real estate | 2025 |
| Little Canopy Limited | Agriculture & fishing | 2020 |
| Little GEM Properties Ltd | Hospitality | 2020 |
| Live I.T. Solutions Limited | Information & communication | 2013 |
| Living Dead Cakes Limited | Information & communication | 2018 |
| LIZ E Nature Beauty Cleaners Ltd | Administrative & support | 2025 |