| Kyle Bigwood Hair Ltd | Other services | 2023 |
| Kynegils Limited | Financial services | 2017 |
| Kzoo Ltd. | Wholesale & retail | 2016 |
| Körber Technologies Limited | Manufacturing | 1980 |
| L Cain Farriery Limited | Professional & scientific | 2017 |
| L R Strategies LLP | | 2021 |
| L Sheppard Plastering Ltd | Construction | 2020 |
| LA Bohème Chic Ltd | Wholesale & retail | 2025 |
| LA Gastronomia Italiana Ltd | Hospitality | 2022 |
| LA Lump Limited | Financial services | 2020 |
| LA Maison DE Papiers Limited | Wholesale & retail | 2015 |
| Labanese House Limited | Hospitality | 2025 |
| Ladyegrove Limited | Information & communication | 2013 |
| Lainston Investment Services Limited | Administrative & support | 1995 |
| Lakeside Walk (Hamworthy) Management Company Limited | Households | 2018 |
| Lakewood Construction Limited | Construction | 2006 |
| Lama Management Company Limited | Administrative & support | 2022 |
| Lambert Legacy Holdings Limited | Financial services | 2025 |
| Lancastrian Grange (Management) Limited | Households | 1964 |
| Land Clear & Forestry Limited | Wholesale & retail | 2024 |
| Land Holdings (Felpham) Ltd | Real estate | 2025 |
| Land Profits Avian Ltd | Real estate | 2024 |
| Land Profits Collins Ltd | Real estate | 2024 |
| Land Profits Deals Limited | Real estate | 2024 |
| Land Profits Harrison Spratt Ltd | Real estate | 2024 |
| Land Profits Homes Spot Limited | Real estate | 2026 |
| Land Profits Whale Ltd | Real estate | 2024 |
| Lander Ltd | Information & communication | 2025 |
| Lanesra Technical Recruitment Limited | Administrative & support | 1999 |
| Langham Place Management Company Limited | Households | 2023 |
| Langton Grove Residents Association Limited | Households | 1980 |
| Lanham Properties Limited | Administrative & support | 2017 |
| Lani Watson Limited | Arts & recreation | 2023 |
| Lanvine Services Ltd | Professional & scientific | 2004 |
| Lapis Research Ltd | Professional & scientific | 2020 |
| Larch Littleton Limited | Construction | 2023 |
| Larchbay Management Company Limited | Households | 1997 |
| Larein Limited | Professional & scientific | 2020 |
| Lark Kids Limited | Wholesale & retail | 2021 |
| Larkhill Law Ltd | Professional & scientific | 2021 |
| Lascaux Technology Limited | Information & communication | 1995 |
| Laskowski Services Ltd | Professional & scientific | 2016 |
| Launchpad Productions LLP | | 2011 |
| Laura Stephenson Design Ltd | Professional & scientific | 2021 |
| Laurus Holdings Limited | Financial services | 2017 |
| Laverstoke Farms Limited | Agriculture & fishing | 2020 |
| Laverstoke Housing Company Limited | Other services | 1998 |
| Laverstoke Management Company Limited | Real estate | 2015 |
| Lawn-Man Limited | Professional & scientific | 2003 |
| Lawrence & Lawrence LLP | | 2008 |
| Lawrence House (Winchester) Management Company Limited | Real estate | 2003 |
| Lawton Collective Ltd | Administrative & support | 2026 |
| LB Construction & Maintenance Ltd | Construction | 2020 |
| LB Creative Limited | Information & communication | 2017 |
| Ld-Gps Ltd | Professional & scientific | 2025 |
| LE DAO Limited | Other services | 2025 |
| LEA Brocklebank Holdings Ltd | Real estate | 2024 |
| LEA Brocklebank Ltd | Professional & scientific | 2021 |
| Lead 2 Fusion Limited | Professional & scientific | 2017 |
| Lead Pixel Software Limited | Information & communication | 2018 |
| Leafield Energy Limited | Energy | 2015 |
| Leaps & Strides Limited | Education | 2017 |
| Learn International Limited | Education | 2015 |
| Learnsmarter Apps Ltd | Information & communication | 2007 |
| Learnsmarter.Com Limited | Extraterritorial | 2004 |
| Leasehold Data Room Ltd | Administrative & support | 2024 |
| Leba Innovation UK Limited | Manufacturing | 2009 |
| Lecanto Limited | Administrative & support | 2018 |
| Leckford Place Management Limited | Households | 2021 |
| Lecowza Limited | Health & social care | 2023 |
| LEE JEN & Co Ltd | Other services | 2026 |
| Leeda Construction Services Ltd | Professional & scientific | 2024 |
| Leftthelenscapon Ltd | Administrative & support | 2014 |
| Legacy Concepts Consulting Ltd | Professional & scientific | 2018 |
| Legacy Estate Holdings Ltd | Real estate | 2025 |
| Legendary Land and Properties Limited | Real estate | 2018 |
| Lemon - Cleaning (Hampshire) Ltd | Administrative & support | 2020 |
| Lenco Civils Limited | Construction | 2026 |
| Lennox Capital Ltd | Other services | 2022 |
| LEO Bangs Limited | Administrative & support | 2023 |
| Leodride Limited | Real estate | 1964 |
| Leopard Clothing Ltd | Wholesale & retail | 2025 |
| Leopard Consulting Ventures Limited | Information & communication | 2012 |
| Leopard Publishing Ventures Limited | Information & communication | 2018 |
| Leopold Land Limited | Professional & scientific | 2004 |
| LET IT Beep Limited | Professional & scientific | 2010 |
| Lethaby & Cook Limited | Administrative & support | 1999 |
| Leveret Lifestyle Ltd | Wholesale & retail | 2025 |
| Leviathan Incident Management Ltd | Professional & scientific | 2023 |
| LEX Projects Limited | Construction | 2014 |
| Lexibel Investments Limited | Professional & scientific | 2021 |
| Leyson Building Consultancy Ltd | Professional & scientific | 2022 |
| Leyton Haus Limited | Administrative & support | 2024 |
| LGD Property Ltd | Real estate | 2022 |
| LHP Interiors Ltd | Manufacturing | 2014 |
| Liberaliter Ltd | Real estate | 2017 |
| Libertatio Limited | Information & communication | 2018 |
| Liberty Livestock Systems Limited | Construction | 1999 |
| Libra Mansions Management Company Limited | Households | 2017 |
| Libratum Partners Limited | Professional & scientific | 2015 |