| LH Electrics Ltd | Construction | 2023 |
| LHK Properties Limited | Real estate | 2016 |
| LHP Investments Limited | Real estate | 2019 |
| LHS Services Ltd | Transport & logistics | 2019 |
| LI Perfect Supplies Ltd | Wholesale & retail | 2026 |
| Lia'J Limited | Wholesale & retail | 2021 |
| Liacare Ltd | Health & social care | 2020 |
| Liam Limited | Other services | 2021 |
| Liam Og's Limited | Hospitality | 2017 |
| Liana.K Photography Ltd | Other services | 2019 |
| Lias Properties Ltd | Real estate | 2023 |
| Liberal Limited | Real estate | 2020 |
| Libertas GBR Limited | Health & social care | 2022 |
| Libri Publishing Limited | Information & communication | 2009 |
| Licenzo Ltd | Wholesale & retail | 2025 |
| Lickn Chicken Limited | Hospitality | 2024 |
| Life and Sports Ltd | Extraterritorial | 2020 |
| Life Beyond Pain Ltd | Education | 2026 |
| Life Eternal Trust (UK) Limited | Professional & scientific | 2008 |
| Life Foods Ltd | Professional & scientific | 2018 |
| Life IS Colourful Ltd | Construction | 2024 |
| Life IS Perspective Limited | Wholesale & retail | 2024 |
| Life Kitchen Ltd | Hospitality | 2022 |
| Lifemed Limited | Health & social care | 2015 |
| Lifestyle by Koko UK Ltd | Manufacturing | 2023 |
| Lifestyle Limitless Ltd | Arts & recreation | 2018 |
| Light Blue Sunshine Limited | Hospitality | 2022 |
| Light-Legacy Ltd | Education | 2024 |
| Lije Ltd | Real estate | 2013 |
| Likcani Construction Ltd | Construction | 2019 |
| Likkle Crumbs Bakery Ltd | Manufacturing | 2026 |
| Likya Study Abroad Consultancy Ltd | Professional & scientific | 2025 |
| Lilada Limited | Wholesale & retail | 2021 |
| Lileb Services Ltd | Professional & scientific | 2018 |
| Lili GRA Estates Ltd | Real estate | 2021 |
| Lily Academy Ltd | Other services | 2017 |
| Lily Nails Spa & Beauty Limited | Other services | 2024 |
| Lilygirl's Signature Limited | Hospitality | 2021 |
| Lilyjas Ltd | Education | 2022 |
| Lilys Kwanga&Food Limited | Manufacturing | 2024 |
| Lime Cafe 2026 Ltd | Real estate | 2026 |
| Lime Trees Residential Care Homes Limited | Health & social care | 1995 |
| Limitless Mobiles Hertford Ltd | Wholesale & retail | 2026 |
| Limitless Mobiles Ltd | Wholesale & retail | 2024 |
| Limitlessdatruth Ltd | Wholesale & retail | 2025 |
| Limkolin London Education Ltd | Professional & scientific | 2025 |
| Lina Consultancy Ltd | Professional & scientific | 2020 |
| Lina Store 24 Ltd | Wholesale & retail | 2025 |
| Lina Wholesale Ltd | Wholesale & retail | 2025 |
| Linaker Street Property Ltd | Real estate | 2025 |
| Lincoln Autotech (London) Ltd | Wholesale & retail | 2019 |
| Lincoln MOT Centre Limited | Wholesale & retail | 2025 |
| Lincoln Windows Limited | Manufacturing | 2001 |
| Linda Building Consultants Ltd | Professional & scientific | 1999 |
| Linda ROE Limited | Administrative & support | 2012 |
| Lindi Plumbing & HIU Services Ltd | Construction | 2026 |
| Linfield Electrical Limited | Construction | 2026 |
| Linga Veretro Consultio Ltd | Financial services | 2016 |
| Linguistic Translation Services Limited | Other services | 2020 |
| Link Procurement Ltd | Professional & scientific | 2024 |
| Links Homes Limited | Real estate | 2010 |
| Linkx One Ltd | Wholesale & retail | 2026 |
| Linq Legal Software Ltd | Information & communication | 2022 |
| Lion Accounting Services Limited | Professional & scientific | 2014 |
| Lion Family Trade Ltd | Wholesale & retail | 2025 |
| Lion Incorporation Ltd | Construction | 2018 |
| Lion Professional Cleaning Ltd | Administrative & support | 2020 |
| Lionel Logitech Ltd | Transport & logistics | 2024 |
| Lionixe Limited | Manufacturing | 2021 |
| Lions Building Services Limited | Construction | 2016 |
| Liora Skin and Body Limited | Other services | 2025 |
| Lipaz Ltd | Wholesale & retail | 2022 |
| Lipl Limited | Real estate | 2025 |
| LIS Design and Engineering Ltd. | Construction | 2017 |
| Lisa's Nail & Spa Limited | Other services | 2020 |
| Lissus Constructions Ltd | Construction | 2022 |
| Listen to ACT Ltd | Health & social care | 2013 |
| Listen UP Consultancy Ltd | Professional & scientific | 2020 |
| Listen UP Research CIC | Information & communication | 2020 |
| Little Bangkok Limited | Hospitality | 2026 |
| Little Beams Childcare Ltd | Health & social care | 2023 |
| Little Collective Ltd | Hospitality | 2021 |
| Little Fish Horizon Limited | Hospitality | 2014 |
| Little Giant Worldwide Ltd | Arts & recreation | 2024 |
| Little Hearts Childminders Ltd | Education | 2023 |
| Little Mint Lamb Limited | Hospitality | 2016 |
| Little Rainbow Child and Healthcare Ltd | Health & social care | 2024 |
| Little Web Studios Ltd | Professional & scientific | 2025 |
| Little Wellbeing Ltd | Education | 2023 |
| Live Life Lightly Developments Limited | Construction | 2026 |
| Live Life Lightly Limited | Construction | 2025 |
| Live Watch Stock Ltd | Information & communication | 2026 |
| Livestock Events CIC | Arts & recreation | 2021 |
| Livewire Darts Limited | Arts & recreation | 2026 |
| Living Ground Limited | Financial services | 2026 |
| Living Room Banbury Ltd | Hospitality | 2026 |
| Living Stones Support Group Ltd | Information & communication | 2025 |
| Lixgate Global UK Ltd | Wholesale & retail | 2025 |
| Liyaa & Co Limited | Wholesale & retail | 2026 |
| Lizben International Ltd | Wholesale & retail | 2018 |