| Latte Limited | Hospitality | 2011 |
| Lauderdale Investments Limited | Administrative & support | 2014 |
| Laundry & Press Ltd | Other services | 2024 |
| Laundry Lounge London Ltd | Other services | 2025 |
| Laura Eyres Creative Limited | Arts & recreation | 2007 |
| Laura’S Cars & Parts Ltd | Wholesale & retail | 2024 |
| Laurdin Labour Ltd | Administrative & support | 2020 |
| Laurel & ADE Services Ltd | Information & communication | 2023 |
| Laurent DE Fontenay Psychology Limited | Health & social care | 2019 |
| Lauriston Saggar Services Limited | Other services | 2016 |
| Laurus Management Ltd | Real estate | 2016 |
| Lavender Road Pharma Limited | Wholesale & retail | 2025 |
| Lavinium Estates Ltd | Real estate | 2016 |
| Lavish Diamond Ltd | Wholesale & retail | 2022 |
| Lavish Ever Care Ltd | Administrative & support | 2025 |
| Lavish Hair & Beauty Salon Limited | Professional & scientific | 2020 |
| Laviy Ltd | Professional & scientific | 2013 |
| Lavly Ltd | Professional & scientific | 2022 |
| Law Hair & Beauty Salon Ltd | Other services | 2025 |
| Lawa Investments Ltd | Real estate | 2024 |
| Lawplus Ltd | Education | 2019 |
| Lawrence-Ragavan Ltd | Real estate | 2025 |
| Laws Bureau Ltd | Professional & scientific | 2024 |
| Lawton Legal Services Limited | Professional & scientific | 2023 |
| LAX Imports Ltd | Administrative & support | 2017 |
| Laxfield House Properties Ltd | Real estate | 2024 |
| Laxmere Limited | Real estate | 2003 |
| Laxmi Property Holdings Limited | Real estate | 2019 |
| Layansbeauty Limited | Other services | 2025 |
| Layhill Properties Ltd | Real estate | 2021 |
| Layla Thamer Ltd | Health & social care | 2017 |
| Lazara Sales Limited | Wholesale & retail | 2024 |
| Lazard Property Solutions Limited | Construction | 2014 |
| Lazarov Network Limited | Other services | 2015 |
| Lazia Limited | Wholesale & retail | 2025 |
| Lazy Crazy London Ltd | Administrative & support | 2024 |
| LB Access Group Ltd | Arts & recreation | 2025 |
| LBC Electrical Limited | Construction | 2017 |
| LBL Motors Limited | Wholesale & retail | 2024 |
| LBM Construction Ltd | Construction | 2026 |
| LBN Hotels Ltd | Hospitality | 2020 |
| LBR Construction Ltd | Construction | 2016 |
| LC Network Ltd | Education | 2025 |
| LC23 Ltd | Extraterritorial | 2023 |
| LCC Education Limited | Education | 2014 |
| LCE Security Ltd | Administrative & support | 2024 |
| LCG MIX Haulage Ltd | Transport & logistics | 2018 |
| Lchrm Education Limited | Education | 2009 |
| LCI Estates Ltd | Real estate | 2018 |
| Lcuk Ilford Ltd | Other services | 2021 |
| LD Nexus Ltd | Education | 2026 |
| LD Site Services Ltd | Construction | 2026 |
| LDA Construction Ltd | Construction | 2019 |
| LDD Services Ltd | Other services | 2019 |
| LDL Matei Ltd | Transport & logistics | 2024 |
| LDM Installers Ltd | Construction | 2007 |
| LDN Agent Ltd | Hospitality | 2020 |
| LDN Catering Supplies Ltd | Wholesale & retail | 2023 |
| LDN Distro Ltd | Wholesale & retail | 2025 |
| LDN Machines Limited | Wholesale & retail | 2021 |
| LDN Motor Traders Limited | Wholesale & retail | 2021 |
| LDN One Management Ltd | Real estate | 2019 |
| LDN Renovate Ltd | Construction | 2024 |
| Ldnmedics Ltd | Health & social care | 2020 |
| LDR Tiling Specialists Ltd | Construction | 2017 |
| LDS Plumbing Services Limited | Construction | 2006 |
| LDT Homes Ltd | Construction | 2021 |
| LDT Insurance Ltd | Financial services | 2011 |
| LDT Real Estate Ltd | Construction | 2021 |
| LE Bateau Lavoir Ltd | Information & communication | 2021 |
| LE Fleur Timber & Joinery Supplies Ltd | Wholesale & retail | 2026 |
| LE Garde-Manger MA Cherie Limited | Hospitality | 2026 |
| LE Hart Ltd | Wholesale & retail | 2019 |
| LE Lagon Apartments Ltd | Households | 2025 |
| LE Vines (UK) Limited | Wholesale & retail | 2004 |
| Leadcraft Solutions Limited | Construction | 2011 |
| Leaders of the Future Limited | Professional & scientific | 2010 |
| Leading Edge Business Services Ltd | Information & communication | 2020 |
| Leadpool Ltd | Information & communication | 2018 |
| Leads Edge Ltd | Wholesale & retail | 2026 |
| Leaf & Loaf Limited | Hospitality | 2024 |
| Leafe Capital Ltd | Real estate | 2025 |
| Leamington Spa Limited | Real estate | 2025 |
| Leap Rabbit Ltd | Wholesale & retail | 2021 |
| Leapay Ltd | Financial services | 2022 |
| Leapord Services Ltd | Administrative & support | 2024 |
| Learn 2 Drive Academy Limited | Education | 2023 |
| Learn and Training Solutions Ltd | Administrative & support | 2025 |
| Learn Care Excel Ltd | Extraterritorial | 2015 |
| Learn Global Education Ltd | Education | 2024 |
| Learn to Leap Nursery Limited | Education | 2011 |
| Learn.Inc Limited | Education | 2019 |
| Learnin Education Ltd | Education | 2025 |
| Learning Resource Centre Ltd | Education | 2022 |
| Learning Station Ltd | Education | 2021 |
| Lease With Ease Ltd | Administrative & support | 2020 |
| Leasehold Forum Limited | Education | 2010 |
| Leasekit Company Limited | Construction | 1994 |
| Leaside Estate Developments Limited | Real estate | 2023 |
| Leather Philosophy Limited | Wholesale & retail | 2017 |