| Lidars Limited | Professional & scientific | 2019 |
| Lidass Fashion Knitwear Limited | Wholesale & retail | 2019 |
| Liebe Investments Ltd | Real estate | 2018 |
| Life Healthcare Holdings Ltd | Financial services | 2021 |
| Life Healthcare Limited | Wholesale & retail | 2021 |
| Liima Limited | Wholesale & retail | 2013 |
| Lilly's Nails & Tanning Limited | Other services | 2019 |
| Lily's Nails Bar Ltd | Other services | 2023 |
| Lima Investments & Properties Limited | Real estate | 2026 |
| Lime Blossom Consultancy Ltd | Professional & scientific | 2018 |
| Linet Network and Engineers Ltd | Wholesale & retail | 2018 |
| LIT Run Community CIC | Information & communication | 2026 |
| LIT Run Ltd | Information & communication | 2025 |
| Little Acorns the Next Generation Limited | Other services | 2009 |
| Little Gaynes Rest Home Limited | Health & social care | 1992 |
| Little Goods Trading Limited | Wholesale & retail | 2024 |
| Little Readers Children's Cafe Ltd | Arts & recreation | 2018 |
| Little Stars Leotards Ltd | Wholesale & retail | 2022 |
| Littlelfs Ltd | Wholesale & retail | 2025 |
| Livin Capital Ltd | Real estate | 2025 |
| LJ Fitness and Leisure Limited | Other services | 2015 |
| LJW Assets Ltd | Real estate | 2026 |
| LKL Investments Limited | Real estate | 2016 |
| Lloyds Horse Ltd | Information & communication | 2015 |
| LMH Bookkeeping Ltd | Professional & scientific | 2026 |
| Lmwc Trading Limited | Wholesale & retail | 2026 |
| LOA Consultancy Ltd | Professional & scientific | 2022 |
| Loai Ltd | Information & communication | 2023 |
| Lochinvar Films Limited | Information & communication | 2023 |
| Lock and Sole Service Ltd | Other services | 2026 |
| Loftus Associates Ltd | Administrative & support | 2022 |
| Logic Innovation Ltd | Transport & logistics | 2021 |
| Logical Perspective Ltd | Information & communication | 2019 |
| Lollius Limited | Hospitality | 2024 |
| Lollyshow Ltd | Health & social care | 2023 |
| LOM Repairs Ltd | Other services | 2024 |
| London & Bali Ltd | Transport & logistics | 2019 |
| London Blind Co. Limited | Wholesale & retail | 2004 |
| London Blind Holdings Limited | Administrative & support | 2006 |
| London Consulting Services Limited | Professional & scientific | 2015 |
| London Housing Development Ltd | Real estate | 2017 |
| London Kent Services Ltd | Administrative & support | 2024 |
| London Kiwi I.T. Services Ltd | Professional & scientific | 2001 |
| Longleigh Store Ltd | Wholesale & retail | 2024 |
| Lord Hill Legacy Limited | Hospitality | 2021 |
| Louisa J. Juchau Limited | Financial services | 2022 |
| Love Bags Ltd | Wholesale & retail | 2021 |
| Love Design Studio Ltd | Administrative & support | 2019 |
| Love Retrofit Ltd | Professional & scientific | 2022 |
| Love Zero Waste Ltd | Professional & scientific | 2024 |
| Lovvart Winner Ltd | Construction | 2023 |
| Loyal Construction Limited | Manufacturing | 2017 |
| Loyal Group Homes Ltd | Real estate | 2022 |
| Loyal's Little Kingdom Limited | Health & social care | 2026 |
| LRO Consulting Ltd | Professional & scientific | 2021 |
| LT Change Consulting Ltd | Professional & scientific | 2019 |
| Lucton Limited | Real estate | 2014 |
| Lucy.Ai Ltd | Information & communication | 2024 |
| Lueshingco Limited | Hospitality | 2025 |
| Luke Autos Limited | Real estate | 2026 |
| Lule Cleaners Ltd | Construction | 2024 |
| Lumina Health and Wellness Ltd. | Wholesale & retail | 2014 |
| Lumina Living Care Ltd | Health & social care | 2020 |
| Lumina Nutraceuticals Ltd | Wholesale & retail | 2023 |
| Luna Vision Ltd | Administrative & support | 2017 |
| Luneta Foods Ltd | Wholesale & retail | 2022 |
| Lushi Management Ltd | Real estate | 2023 |
| Lushi Properties Ltd | Real estate | 2017 |
| LUX Installations Ltd | Construction | 2015 |
| Luxe Brickwork LDN Limited | Construction | 2024 |
| LV Revenue Ltd | Information & communication | 2012 |
| Lvbonsai Limited | Wholesale & retail | 2026 |
| LVM Services H20 Limited | Construction | 2025 |
| Lwjr Bars Ltd | Hospitality | 2025 |
| Lynton Lodge Management Company Limited | Real estate | 1992 |
| Lypo Holdings Limited | Financial services | 2025 |
| M & a Holdings Group Ltd | Real estate | 2021 |
| M H Coachworks & Sons Limited | Wholesale & retail | 2011 |
| M&N Ltd | Real estate | 2024 |
| M-Factorial Limited | Professional & scientific | 2003 |
| M.B. Lift Services Ltd. | Professional & scientific | 2008 |
| M3M Global Enterprise Ltd | Construction | 2018 |
| MA Electrical Solutions Ltd | Construction | 2018 |
| MA Marketing One Ltd | Professional & scientific | 2026 |
| MAA Exim Ltd | Wholesale & retail | 2020 |
| Maars Fostering Limited | Health & social care | 2024 |
| MAC Construction Ltd | Construction | 2013 |
| Macabi Solutions Limited | Construction | 2014 |
| Madison Jayde Agencies Limited | Wholesale & retail | 2025 |
| Mafo Ltd | Construction | 2024 |
| Magitech Ltd | Information & communication | 2012 |
| Magopa Limited | Real estate | 2015 |
| Mahabir Properties Ltd | Real estate | 2022 |
| Mahaperiyava Info Systems Ltd | Information & communication | 2024 |
| Maidstone Property Investment Ltd | Real estate | 2023 |
| Mainstream Granite Limited | Construction | 2014 |
| Mainstream Projects Limited | Construction | 2024 |
| Mainstream Transport and Logistics Limited | Transport & logistics | 2024 |
| Maison 44 Ltd | Wholesale & retail | 2024 |
| Maison Crofts Residents Company Limited | Administrative & support | 2008 |