| Kyvu Ltd | Wholesale & retail | 2025 |
| L-Evatin Limited | Professional & scientific | 2021 |
| L.J.S. Soft Furnishings Limited | Construction | 2013 |
| L4C Croydon Ltd | Professional & scientific | 2023 |
| L7 Services Ltd | Professional & scientific | 2013 |
| LA MER Beauté Ltd | Arts & recreation | 2023 |
| LA MON Amour Ltd | Wholesale & retail | 2026 |
| LA Pelle Skin Clinic Limited | Other services | 2015 |
| Lakeside Estates Limited | Administrative & support | 1982 |
| Lamgen Limited | Real estate | 2023 |
| Lana Home Design Ltd | Professional & scientific | 2023 |
| Lancaster Close Residents Association Limited | Households | 2002 |
| Landmark Peninsula Investment Limited | Real estate | 2024 |
| Landstax Limited | Real estate | 2022 |
| Langland Solutions Limited | Professional & scientific | 2012 |
| Language Services Ltd | Education | 2016 |
| Lanigan Estates Ltd | Real estate | 2010 |
| Lantern Court Management Company Limited | Households | 1988 |
| Lantern House Foods Ltd | Hospitality | 2025 |
| Laochang Trip Ltd | Administrative & support | 2024 |
| Later Life Services Limited | Professional & scientific | 2025 |
| Lateral Scope Ltd | Information & communication | 2025 |
| Launch Lean Limited | Professional & scientific | 2025 |
| Laurentiu Carabula Ltd | Transport & logistics | 2025 |
| Lavington Court (Freehold) Limited | Real estate | 2008 |
| Lavington Court Limited | Households | 1984 |
| Law & Shah Limited | Professional & scientific | 1999 |
| LC Hicks Ltd | Construction | 2024 |
| LCL Trade Ltd | Wholesale & retail | 2021 |
| Ld&B Ltd | Professional & scientific | 2024 |
| Ldnconcierge Limited | Administrative & support | 2017 |
| Leading Concepts UK Limited | Information & communication | 2008 |
| Leading Creative Talent Ltd | Professional & scientific | 2013 |
| Leaf Advisory Group Ltd | Professional & scientific | 2026 |
| Leaf Philatelics Ltd | Wholesale & retail | 2026 |
| Learning Cycle Ltd | Education | 2008 |
| Leaselux Ltd | Administrative & support | 2025 |
| LEE & Capital Partners Limited | Professional & scientific | 2012 |
| Leeway Care Kingston Ltd | Public administration | 2024 |
| Legal Mart Limited | Information & communication | 2024 |
| Legal Services International Ltd | Professional & scientific | 2026 |
| Legaland Services Ltd | Professional & scientific | 2022 |
| Legless Imports Ltd | Wholesale & retail | 2024 |
| Leilafrancesconsulting Ltd | Professional & scientific | 2023 |
| Lemr Ltd | Professional & scientific | 2024 |
| LEO London Consult Ltd | Information & communication | 2024 |
| Leo's Motors Center Ltd | Extraterritorial | 2017 |
| Lesmo Limited | Wholesale & retail | 2009 |
| Letsvibe Ltd | Arts & recreation | 2021 |
| Levo Light Limited | Wholesale & retail | 2020 |
| Leylands Management Company Limited | Households | 1981 |
| LG Group Ltd | Administrative & support | 2025 |
| Lgnm Consulting Limited | Professional & scientific | 2020 |
| LH Sourcing Ltd | Wholesale & retail | 2015 |
| Libertas Productions Ltd | Other services | 2018 |
| Liberty Design and Developments Ltd | Construction | 2019 |
| Liblon Limited | Transport & logistics | 2024 |
| Libra Accountancy Limited | Professional & scientific | 2007 |
| Libra Ventures Digital Ltd | Information & communication | 2023 |
| Life Supply Co Ltd | Manufacturing | 2011 |
| LIFE4CUTS Box Ltd | Wholesale & retail | 2023 |
| LIFE4CUTS JS Ltd | Wholesale & retail | 2023 |
| LIFE4CUTS Ltd | Professional & scientific | 2022 |
| LIFE4CUTS SC Ltd | Professional & scientific | 2023 |
| Liles Morris Limited | Other services | 2007 |
| Lillie Road 1963 Limited | Extraterritorial | 2014 |
| Lily London Coffee Ltd | Hospitality | 2021 |
| LIM Brothers Ltd | Hospitality | 2023 |
| Lima Construction Limited | Construction | 2021 |
| Lime Court (Cambridge Road) Freeholders Limited | Households | 2015 |
| Lime Court (Cambridge Road) Management Company Limited | Households | 2015 |
| LIN & Wang Ltd | Hospitality | 2017 |
| Line-Dive (Worldwide) Limited | Manufacturing | 2021 |
| Line-Dive Global Limited | Manufacturing | 2000 |
| Lineco Ltd | Real estate | 2016 |
| Link Compliance Services Limited | Professional & scientific | 2024 |
| Linkfern Limited | Real estate | 2015 |
| Linktrans Logistics (UK) Limited | Transport & logistics | 2022 |
| Lion Cigars Ltd | Wholesale & retail | 2024 |
| Lion Peak Capital Ltd | Wholesale & retail | 2026 |
| Lionheartblue Ltd | Information & communication | 2019 |
| Lithp Ltd | Health & social care | 2023 |
| Little Finch Ltd | Wholesale & retail | 2023 |
| Littlediode Ltd | Wholesale & retail | 2006 |
| Live Sell Academy Ltd | Professional & scientific | 2025 |
| Living Adventure Holidays Limited | Administrative & support | 2022 |
| Livingweaving Ltd | Hospitality | 2020 |
| Livwell Realty Limited | Real estate | 2026 |
| LIZ Jordan Content & Editorial Ltd | Information & communication | 2013 |
| Lizzis Magic Touch Limited | Other services | 2024 |
| LK Erdenet Limited | Professional & scientific | 2020 |
| LK World Limited | Wholesale & retail | 2020 |
| LKM Studio Ltd | Information & communication | 2023 |
| LL Housing Commercial Ltd | Real estate | 2022 |
| LL Housing Ltd | Real estate | 2020 |
| LNA Learning Ltd | Information & communication | 2021 |
| LNK Ltd | Construction | 2022 |
| Localkind Ltd | Information & communication | 2025 |
| Lochmond Ltd | Wholesale & retail | 2020 |
| Lockard and Associates LLP | | 2012 |