| LFD Group London Limited | Water & waste | 2025 |
| LFP Builder Ltd | Construction | 2023 |
| LFP Education Consultancy Limited | Education | 2022 |
| LG Lift Solutions Ltd | Construction | 2025 |
| LGX Holdings Limited | Financial services | 2015 |
| LHS Worldwide Financial Solutions Ltd | Financial services | 2022 |
| Liam Gartland Ltd | Arts & recreation | 2021 |
| Libra Group London Ltd | Construction | 2018 |
| Libra Partnership Ltd | Health & social care | 2016 |
| Libra Support Management Ltd | Construction | 2018 |
| Licensed Trade Solutions Limited | Other services | 2017 |
| Life Dynamix Limited | Health & social care | 2006 |
| Lifecyclestor Limited | Extraterritorial | 2015 |
| Lifestyle Lxndon Ltd | Manufacturing | 2021 |
| Lifeswonderful Ltd | Wholesale & retail | 2009 |
| Lift Safe Register Ltd | Information & communication | 2022 |
| Liftconsult Ltd | Professional & scientific | 2020 |
| Liftec Express Limited | Construction | 1997 |
| Lifted Limited | Manufacturing | 2013 |
| Lifter UP C.I.C. | Wholesale & retail | 2025 |
| Liftklif Ltd | Transport & logistics | 2019 |
| Liftmove Ltd | Construction | 2024 |
| Lifts for London Ltd | Manufacturing | 2023 |
| Light Cave Asset Management Ltd | Real estate | 2025 |
| Light Couture Limited | Administrative & support | 2015 |
| Light Hill Limited | Administrative & support | 2022 |
| Light Productions Ltd | Information & communication | 2025 |
| Light Support Limited | Other services | 2023 |
| Liiseayla Holdings Limited | Financial services | 2026 |
| Like Foods Ltd | Wholesale & retail | 2018 |
| Lilah Assoh Consultants Limited | Other services | 2019 |
| Lilley Funeral Directors Limited | Other services | 2021 |
| Lillian Logistics Ltd | Transport & logistics | 2023 |
| Lilly Harrod Limited | Construction | 2016 |
| Lilmacc Ltd | Wholesale & retail | 2013 |
| Lilu Leicester Limited | Hospitality | 2021 |
| Lily L MAY Limited | Real estate | 2015 |
| Lime Public Relations Limited | Other services | 2006 |
| Limitless Designs Inc Ltd | Wholesale & retail | 2017 |
| Limitless Kitchens and Furniture Ltd | Construction | 2021 |
| Lincoln Plumbing Services Ltd | Construction | 2018 |
| Lincolnshire EGG Company Limited | Administrative & support | 2016 |
| Lindenhall Properties Limited | Real estate | 2026 |
| Linen Rental Limited | Administrative & support | 2016 |
| Lineup Recruitment Ltd | Administrative & support | 2017 |
| Lings Properties Limited | Real estate | 2024 |
| Linguine Ltd | Hospitality | 2020 |
| Linguini Bars Ltd | Hospitality | 2025 |
| Link Consulting Ltd | Real estate | 2007 |
| Link Three Star Limited | Wholesale & retail | 2012 |
| Linkway Financial Communications Ltd | Administrative & support | 2003 |
| Linton Hill Developments Limited | Construction | 2021 |
| Lintons Property Solutions Ltd. | Households | 2020 |
| LIO Builders Ltd | Construction | 2024 |
| Lion Commercial Property Limited | Real estate | 2020 |
| Lionheart Security Ltd | Administrative & support | 2016 |
| Lionheart Security Management Limited | Administrative & support | 2007 |
| Lions Premium Properties Ltd | Real estate | 2021 |
| Lior Group Ltd | Manufacturing | 2026 |
| Liper Shelters Limited | Construction | 2024 |
| LIQ Wizard Distro Ltd | Wholesale & retail | 2018 |
| Lirona Limited | Extraterritorial | 2015 |
| Lisa Redman Limited | Manufacturing | 2007 |
| Lisarman Care Limited | Health & social care | 2026 |
| Lite Scaffolding Ltd | Construction | 2009 |
| Little Barton (Management) Limited | Real estate | 1992 |
| Little Cubs Baby Boutique Ltd | Wholesale & retail | 2025 |
| Little Golden Feet Childcare Services Limited | Health & social care | 2023 |
| Little Hoopers Community Interest Company | Arts & recreation | 2021 |
| Little Hoopers Franchise Limited | Arts & recreation | 2023 |
| Little Larges Day Nursery Ltd | Education | 2024 |
| Little Lucia Luxe Boutique Ltd | Wholesale & retail | 2026 |
| Little Mack Studio Ltd | Arts & recreation | 2025 |
| Little Oakes Limited | Education | 2021 |
| Little Queen Street Management Company Ltd | Administrative & support | 2010 |
| Little Randolphs Farm Management Company Ltd | Households | 2024 |
| Little Soldiers Child Care Services Limited | Health & social care | 2020 |
| Little Theatre LLP | | 2023 |
| Littlefeather Ltd | Real estate | 2021 |
| Littlewood Enterprise Management Limited | Administrative & support | 2013 |
| Liutaur Limited | Construction | 2025 |
| LIV Gardens & Maintenance Ltd | Administrative & support | 2026 |
| Live in Harmony Limited | Health & social care | 2024 |
| Livermores the Estate Agents Limited | Real estate | 2006 |
| Living Green Associates Limited | Administrative & support | 2021 |
| Living Installations London Ltd | Construction | 2014 |
| Living the 3 RS Limited | Professional & scientific | 2019 |
| Livingvision Consultancies Limited | Information & communication | 2010 |
| LIZ Samuels Limited | Arts & recreation | 2015 |
| LJ Clark Ltd | Transport & logistics | 2023 |
| LKS General Builders Ltd | Construction | 2019 |
| LKW Projects Ltd | Construction | 2021 |
| LLA Transport Limited | Transport & logistics | 2026 |
| Llamedos Properties Ltd. | Construction | 2019 |
| LMC Mobile Repairs Ltd | Other services | 2026 |
| LMC Repair Services Ltd | Construction | 2026 |
| Lmct Consultancy Services Limited | Other services | 2002 |
| LMF Autos Ltd | Wholesale & retail | 2024 |
| LMP Electrical Services Limited | Construction | 2015 |
| Lmqawards Limited | Education | 2022 |