| Ld-Gss Ltd | Professional & scientific | 2025 |
| LDC Turf & Irrigation Ltd | Construction | 2016 |
| LDD Properties Ltd | Real estate | 2023 |
| Ldgproductions Ltd | Information & communication | 2026 |
| LDJ Limited | Transport & logistics | 2017 |
| LDN Car Sales Ltd | Wholesale & retail | 2016 |
| LDN Installation Ltd | Construction | 2020 |
| LE Petit Village Ltd | Arts & recreation | 2022 |
| LE Sequoia Ltd | Wholesale & retail | 2021 |
| Lead Communications Limited | Other services | 2016 |
| Learn Driving School Ltd | Education | 2024 |
| Learning Keys CIC | Education | 2023 |
| Leaton Alexander Blake Limited | Extraterritorial | 2024 |
| LEE LEE Lettings Limited | Real estate | 2025 |
| LEE of Sheffield Limited | Extraterritorial | 1938 |
| LEE Stainless Steel Services Limited | Extraterritorial | 1950 |
| Leeplas Limited | Extraterritorial | 1950 |
| Legacy Safety and Security Solutions Ltd | Administrative & support | 2026 |
| Legumes Ltd | Education | 2005 |
| Leighton Ironcraft Limited | Manufacturing | 2001 |
| Lemor Building Contractors Ltd | Construction | 2018 |
| Lena Media Consultancy Limited | Professional & scientific | 2017 |
| LET London Ltd | Real estate | 2019 |
| Let's Pawty UK Ltd | Extraterritorial | 2024 |
| Letchworth Services Limited | Extraterritorial | 2024 |
| Letica Property Investments Limited | Real estate | 2025 |
| Leung IT Services Limited | Information & communication | 2017 |
| Levantini Ltd | Information & communication | 2018 |
| Level UP PM Academy Ltd | Professional & scientific | 2025 |
| Lewis Daniels Ltd | Real estate | 2024 |
| Lexbridge Trading Limited | Health & social care | 2011 |
| Lexlegal Associates Ltd | Professional & scientific | 2026 |
| Lextee Limited | Construction | 2019 |
| Leylam Catering Ltd | Hospitality | 2024 |
| LG Consultancy House Ltd | Professional & scientific | 2023 |
| LGW Properties (UK) Limited | Administrative & support | 2017 |
| Liberty Accountancy Services Ltd | Professional & scientific | 2024 |
| Liberty Living Care Group Ltd | Health & social care | 2023 |
| Licqual UK Ltd | Education | 2023 |
| Lifeartist Limited | Information & communication | 2025 |
| Lifetone Ltd | Wholesale & retail | 2019 |
| Lifhea Ltd | Health & social care | 2025 |
| Lights on Electrical Services Ltd | Construction | 2025 |
| Lightwave Productions Ltd | Other services | 2012 |
| Lignum Property Group Ltd | Real estate | 2025 |
| Lignum Property Ltd | Real estate | 2020 |
| Lignum Property Management Ltd | Real estate | 2026 |
| Lilamed Ltd | Financial services | 2024 |
| Limitless Ltd | Information & communication | 2022 |
| Linear Brickwork Ltd | Extraterritorial | 2016 |
| Linguahouse CIC | Education | 2015 |
| Linknet I.T. Limited | Information & communication | 1998 |
| Linso Limited | Wholesale & retail | 2026 |
| Lion Puppy Ltd | Professional & scientific | 2025 |
| Lions Residential Ltd | Administrative & support | 2013 |
| Lisa's Living Club Ltd | Other services | 2022 |
| Little Hands LDN Limited | Education | 2025 |
| Little Liban Ltd | Hospitality | 2025 |
| Little Party Angel's Ltd | Hospitality | 2023 |
| Little RYE Nursery Ltd | Health & social care | 2022 |
| Little Stars Day Care Ltd | Health & social care | 2022 |
| Liutak Construction Ltd | Construction | 2025 |
| LIV Space Ltd | Construction | 2023 |
| Livi's Cuisine Limited | Administrative & support | 2011 |
| Living Word Ministries, Surrey | Other services | 2013 |
| Livingscape Homes Ltd | Real estate | 2023 |
| Liza's TUK TUK Ltd | Professional & scientific | 2019 |
| Lizzy House Clearance Ltd | Administrative & support | 2019 |
| LJ Mooves Ltd | Transport & logistics | 2026 |
| LM Professional Touch Limited | Administrative & support | 2018 |
| Lmmm IT Contracts Ltd | Information & communication | 2025 |
| Lmsrd Limited | Health & social care | 2026 |
| LMT Trading Ltd | Administrative & support | 2014 |
| LMU Aesthetics Ltd | Professional & scientific | 2025 |
| LN & AF Property Limited | Real estate | 2023 |
| LN & BB Property Limited | Real estate | 2024 |
| LN & BM Property Limited | Real estate | 2023 |
| LN & DG Property 2 Ltd | Real estate | 2021 |
| LN & DG Property Ltd | Real estate | 2023 |
| LN & HL Property Limited | Real estate | 2024 |
| LN & IH Property Limited | Real estate | 2024 |
| LN & JA Property Limited | Real estate | 2021 |
| LN & JI Property Limited | Real estate | 2023 |
| LN & JK Property Limited | Real estate | 2024 |
| LN & RR Property Limited | Real estate | 2024 |
| LN & RS Property Limited | Real estate | 2024 |
| LN & SG Property Limited | Real estate | 2023 |
| LN & WC Property Limited | Real estate | 2024 |
| LN & WD Property Limited | Real estate | 2024 |
| LN Capital Ltd | Real estate | 2018 |
| LN Project Management Ltd | Construction | 2023 |
| LO (K2) Limited | Real estate | 2024 |
| Local Vertical Ltd | Information & communication | 2024 |
| Locks of Love Ltd | Other services | 2025 |
| Locumsmart Ltd | Administrative & support | 2020 |
| Logistics & Supply Chain Consult Ltd | Other services | 2019 |
| Logix FM Ltd | Construction | 2024 |
| Lolo Investment Ltd | Wholesale & retail | 2013 |
| London & Surrey Electrical Ltd | Manufacturing | 2018 |
| London ALL Star Limited | Wholesale & retail | 2024 |