| Lexia House Ltd | Information & communication | 2018 |
| Lexida Ltd | Wholesale & retail | 2021 |
| Lexlease Travel Ltd | Administrative & support | 2019 |
| Leynton Consultancy Limited | Professional & scientific | 2018 |
| Leyton Polishcraft Limited | Administrative & support | 2004 |
| Lezma KRD Ltd | Wholesale & retail | 2025 |
| LFR Sealants Limited | Construction | 2022 |
| LGH Solutions Limited | Professional & scientific | 2012 |
| LGR Services Group Ltd | Construction | 2025 |
| LGV Solutions UK Limited | Construction | 2017 |
| LH Bathrooms Ltd | Construction | 2020 |
| Lhaval KRD Ltd | Wholesale & retail | 2025 |
| Lhbh Limited | Administrative & support | 2013 |
| LHG Electrical Ltd | Construction | 2024 |
| LI & KO Ltd | Construction | 2017 |
| LI Jordan Rose Ltd | Information & communication | 2025 |
| Liam Priestnall Publishing Limited | Information & communication | 2017 |
| Liana Constructions Ltd | Construction | 2025 |
| Liana Properties UK Ltd | Real estate | 2019 |
| Libation 2 Limited | Hospitality | 2021 |
| Liberate Your Yearning Ltd | Professional & scientific | 2025 |
| Libere Tech Limited | Information & communication | 2024 |
| Licence Delay Limited | Financial services | 2025 |
| Lichfield Residential Limited | Real estate | 2021 |
| Lick Media Ltd | Information & communication | 2021 |
| Lida's Beauty Limited | Manufacturing | 2023 |
| Lider Food Ltd | Other services | 2025 |
| Life Bridge Pharma Ltd | Wholesale & retail | 2024 |
| Life Education Trust | Education | 2012 |
| Life Line Services Ltd | Health & social care | 2022 |
| Life Pharma Limited | Health & social care | 2011 |
| Life Train US Limited | Health & social care | 2020 |
| Lifeline Nutrition Limited | Wholesale & retail | 2019 |
| Lifeline Personalised Care Services Ltd | Health & social care | 2014 |
| Lifestyle & Health UK Ltd | Health & social care | 2024 |
| Lifestyle Hair Saloon Ltd | Other services | 2024 |
| Lifestyle Hairs & Beauty Ltd | Other services | 2024 |
| Lifestyle Marketing (UK) Limited | Professional & scientific | 2009 |
| Lifestyle Windows Limited | Manufacturing | 2022 |
| Lifting & Co Limited | Construction | 2016 |
| Light and Day Limited | Information & communication | 2025 |
| Light Mobile UK Ltd | Wholesale & retail | 2025 |
| Light-Tek Ltd | Construction | 2024 |
| Lightbulb Developments Ltd | Construction | 2022 |
| Lighthouse Care Services Ltd | Hospitality | 2017 |
| Lighthouse Carpentry Ltd | Manufacturing | 2019 |
| Lighthouse SL Ltd | Health & social care | 2022 |
| Lighting Speed Solutions Ltd | Manufacturing | 2024 |
| Lightning JNR Limited | Arts & recreation | 2025 |
| Lightning Thoughts Ltd | Administrative & support | 2020 |
| Lika Property Management Ltd | Real estate | 2022 |
| Likebrothers Ltd | Construction | 2024 |
| Likewise Christian Ministries | Other services | 2001 |
| Lilipop Management Services Limited | Professional & scientific | 2019 |
| Lilirein Ltd | Wholesale & retail | 2019 |
| Lilly Louis Ltd | Wholesale & retail | 2024 |
| Lily Rose Estates Ltd | Construction | 2026 |
| Lily's Domestic Services Ltd | Administrative & support | 2024 |
| Lilybox Limited | Wholesale & retail | 2023 |
| Lilysik Ltd | Professional & scientific | 2023 |
| Limani Homes Ltd | Real estate | 2022 |
| Limar Properties Ltd | Real estate | 2017 |
| Limas Care Limited | Health & social care | 2020 |
| Limbfit P&O Services Ltd | Health & social care | 2017 |
| Limehouse Partners Limited | Professional & scientific | 2016 |
| Liminal Design & Construction Ltd | Construction | 2024 |
| Limitless Accounting Ltd | Professional & scientific | 2021 |
| Limitless Growth Foundation CIC | Other services | 2024 |
| Limitless Personal Excellence Ltd. | Other services | 2015 |
| Limitless Property Management Ltd | Households | 2025 |
| Limitless Realty Limited | Real estate | 2025 |
| Limitless TS Ltd | Professional & scientific | 2011 |
| Limpex Commercial Cleaning Services Ltd | Administrative & support | 2021 |
| Limux Ltd | Wholesale & retail | 2022 |
| Lina CC Ltd | Professional & scientific | 2011 |
| Lincoln Electrical Contracts Limited | Construction | 2017 |
| Lincoln Medics Limited | Health & social care | 2013 |
| Linda Adedeji TV Ltd | Arts & recreation | 2024 |
| Linea Holdings Limited | Real estate | 2025 |
| Linen and LUX Ltd | Information & communication | 2026 |
| Link Car Recovery & Transporter Ltd | Transport & logistics | 2013 |
| Link Legal Advisory Limited | Professional & scientific | 2013 |
| Linkgoal Digital Ltd | Information & communication | 2024 |
| Linkitech Ltd | Information & communication | 2024 |
| LINKUP24 Ltd | Administrative & support | 2021 |
| Linna&Co UK Ltd | Wholesale & retail | 2018 |
| Linny Hair Ltd | Other services | 2025 |
| Linnylove Ltd | Other services | 2015 |
| Lins Dessert Consultancy Ltd | Hospitality | 2023 |
| Linsori Limited | Wholesale & retail | 2025 |
| Linzi Limited | Real estate | 2012 |
| Linzishoes Limited | Wholesale & retail | 2005 |
| Linzishoes.Com Limited | Professional & scientific | 2006 |
| Lion Construction 2021 Limited | Construction | 2021 |
| Lion Electrician Ltd | Construction | 2024 |
| Lion Legion Ltd | Extraterritorial | 2021 |
| Lionleo Ltd | Construction | 2026 |
| Lions London 2025 Limited | Other services | 2025 |
| Lions Recruitment Ltd | Construction | 2022 |
| Lionsgate Analytics Ltd | Information & communication | 2025 |