| Kilgannon Group Environmentals Limited | Other services | 2024 |
| Kilgannon Group Limited | Construction | 2022 |
| Kilgannon Haulage Ltd | Construction | 2025 |
| Kilgannon Street Care Holdings Limited | Construction | 2019 |
| Kingdom Focused Media Limited | Information & communication | 2018 |
| KKR Development Ltd | Construction | 2024 |
| Klarity Education Ltd | Hospitality | 2025 |
| KMB Property Service Ltd | Construction | 2020 |
| KMR World Ltd | Arts & recreation | 2024 |
| KO Financials Ltd | Financial services | 2020 |
| Kool Duct Ltd | Extraterritorial | 2007 |
| Korealm Limited | Real estate | 2016 |
| Kored UK Limited | Real estate | 2022 |
| Koyakosmetic Limited | Wholesale & retail | 2024 |
| KRD Catering Equipments Ltd | Wholesale & retail | 2021 |
| KRT & Services Limited | Wholesale & retail | 2026 |
| Ksvvres Limited | Real estate | 2021 |
| Kubby's Venture Ltd | Financial services | 2020 |
| Kubic Trans Ltd | Transport & logistics | 2018 |
| Kumar Private Ltd | Construction | 2022 |
| Kuvira London Ltd | Professional & scientific | 2014 |
| Kwakufrimpong Ltd | Health & social care | 2023 |
| Kwaw-Enterprise Ltd | Health & social care | 2022 |
| L S T Ventures Ltd | Professional & scientific | 2008 |
| L&C Residential Ltd | Real estate | 2017 |
| Laas-Merit Ltd | Administrative & support | 2025 |
| Ladieswho Ltd | Arts & recreation | 2026 |
| Lahoria Constructions Ltd | Construction | 2025 |
| Lajef Consultancy Limited | Information & communication | 2023 |
| LAN Audio Visual Ltd | Construction | 2023 |
| Land Base Investments Ltd | Real estate | 2025 |
| Langley School of Dance Limited | Education | 2016 |
| Lash Klan Limited | Wholesale & retail | 2023 |
| Lavrenti Limited | Public administration | 2024 |
| Lawextra Limited | Real estate | 2016 |
| LB Apparel Ltd | Wholesale & retail | 2012 |
| LBX Ltd | Manufacturing | 2025 |
| Leaduk Services Limited | Other services | 2017 |
| Ledgerbridge Advisory Ltd | Professional & scientific | 2026 |
| Legacy Pathway Property Limited | Real estate | 2024 |
| Lehal Real Estate Limited | Real estate | 2021 |
| Leo's Enterprise Ltd | Wholesale & retail | 2025 |
| Leshinto Consulting Ltd | Professional & scientific | 2022 |
| Level UP Socials Ltd | Professional & scientific | 2021 |
| LIA Services Ltd | Construction | 2016 |
| Liberty Investments UK Ltd | Extraterritorial | 2004 |
| Life Relief Foundation | Health & social care | 2011 |
| LIN Builders Limited | Construction | 2013 |
| Linch 1529 Limited | Information & communication | 2016 |
| Linkpin Ltd | Wholesale & retail | 2005 |
| LNA Services Limited | Financial services | 2022 |
| Lndconstruction Ltd | Manufacturing | 2023 |
| Local MAN With Van Ltd | Transport & logistics | 2025 |
| Lockedinuk Ltd | Arts & recreation | 2026 |
| LOLA2TENI Care Consultant Limited | Health & social care | 2024 |
| Lolade’S Contracting Hub Limited | Administrative & support | 2024 |
| London Horse Ltd | Information & communication | 2014 |
| Long Van Limited | Other services | 2025 |
| Loon Limited | Health & social care | 2017 |
| Loveworld UK Zone 1 Ltd | Other services | 2022 |
| Lpharm Holdings Ltd | Financial services | 2026 |
| Lpharm Ltd. | Other services | 2014 |
| Lucas Akro (SPV) Ltd | Real estate | 2025 |
| Lucky Tech Bowl Limited | Wholesale & retail | 2026 |
| Lumina Marketing Ltd | Professional & scientific | 2025 |
| Luminary Accommodate and Lettings Limited | Real estate | 2025 |
| Luminus London Ltd | Wholesale & retail | 2022 |
| Lumya Ltd | Wholesale & retail | 2023 |
| Lunchies Ltd | Hospitality | 2021 |
| LUV Lifestyle Limited | Wholesale & retail | 2019 |
| LYL Business Ltd | Administrative & support | 2012 |
| LYL Holdings Ltd | Real estate | 2017 |
| M C General Building Services Ltd | Construction | 2020 |
| M Francis Designs Ltd | Professional & scientific | 2018 |
| M Prestige Ltd | Wholesale & retail | 2025 |
| M&T Homeware Ltd | Wholesale & retail | 2025 |
| M5B Ltd | Financial services | 2021 |
| Main Marketing Group Ltd | Professional & scientific | 2026 |
| Maintenance and Technical Services Ltd | Professional & scientific | 2018 |
| Majeke Consulting Ltd | Professional & scientific | 2026 |
| Makay Properties Ltd | Real estate | 2008 |
| Malhi Haulage Limited | Transport & logistics | 2023 |
| Mali's Prestige Properties Ltd | Real estate | 2025 |
| Mametja Ltd | Health & social care | 2019 |
| Mamiras Ltd | Wholesale & retail | 2020 |
| Mand International Ltd | Construction | 2021 |
| Manes Consultancy Limited | Information & communication | 2007 |
| Manheer Catering Ltd | Hospitality | 2024 |
| Mansfield LEX Juris Ltd | Real estate | 2025 |
| Marbil Limited | Wholesale & retail | 2024 |
| Markus SMD Ltd | Wholesale & retail | 2020 |
| Marsam Global Ltd | Wholesale & retail | 2018 |
| Martins Excavation Ltd | Construction | 2024 |
| Marydale Ltd | Professional & scientific | 2020 |
| Maso Food Ltd | Extraterritorial | 2021 |
| Mason P Constructions Limited | Manufacturing | 2025 |
| Master Malt UK Ltd | Hospitality | 2013 |
| Materoofing Ltd | Construction | 2025 |
| Matu Services Ltd | Construction | 2023 |
| Maximus Abode Ltd | Real estate | 2024 |