| LRK Limited | Real estate | 2011 |
| LS Electrical Contracting Ltd | Construction | 2018 |
| LSA Recruitment Limited | Administrative & support | 2005 |
| LSC Ipswich Ltd | Administrative & support | 2017 |
| LSM Transport Ltd | Transport & logistics | 2021 |
| Lsrk Ltd | Administrative & support | 2023 |
| LT Optima Holding Limited | Financial services | 2024 |
| LT45 Ltd | Information & communication | 2023 |
| Luade Ltd | Wholesale & retail | 2016 |
| Lubaba Hub Ltd | Construction | 2026 |
| Lubna Begum Optics Ltd | Health & social care | 2023 |
| LUCA2014 Trans Ltd | Transport & logistics | 2023 |
| Lucas Close (Burwell) Management Company Limited | Households | 2018 |
| Lucas Inspection Services Ltd | Professional & scientific | 2024 |
| Lucas Physio Limited | Other services | 2012 |
| Lucasea Limited | Real estate | 2016 |
| Luci Morgan Studios Ltd | Education | 2020 |
| Lucid Assets Ltd | Real estate | 2020 |
| Lucid Enterprises Ltd | Information & communication | 2020 |
| Lucid Payroll Ltd. | Professional & scientific | 2023 |
| Lucid Systems Ltd | Information & communication | 2009 |
| Lucid Urban Design & Architecture Ltd | Professional & scientific | 2025 |
| Lucie Ataya Ltd | Information & communication | 2025 |
| Lucifor Limited | Transport & logistics | 2018 |
| Lucky CC Limited | Hospitality | 2023 |
| Lucky Cookie Ltd | Hospitality | 2022 |
| Lucky Lane Transport Limited | Transport & logistics | 2015 |
| Lucy Oliver Designs Limited | Wholesale & retail | 2025 |
| Ludan Developments Limited | Construction | 2023 |
| LUK Transport Ltd | Transport & logistics | 2024 |
| Lukasz Logistics Ltd | Transport & logistics | 2024 |
| Luke Chapman Consulting Ltd | Professional & scientific | 2025 |
| Luke Patience Sailing Limited | Arts & recreation | 2017 |
| Lukee Ltd | Transport & logistics | 2021 |
| Lukes Handy Services Ltd | Administrative & support | 2026 |
| Lulat Ltd | Health & social care | 2023 |
| Lulu's Dog Grooming Salon Ltd | Other services | 2026 |
| Luma East Limited | Construction | 2013 |
| Luma Insights Limited | Administrative & support | 2020 |
| Lumaa Ltd | Transport & logistics | 2016 |
| Lumen Solar Ltd | Construction | 2025 |
| Lumevo Marketing Limited | Professional & scientific | 2026 |
| Lumiara Ltd | Wholesale & retail | 2025 |
| Luminor Ltd | Professional & scientific | 2002 |
| Luminous Care Services Ltd | Health & social care | 2025 |
| Lummis Developments Limited | Construction | 2012 |
| Luna Medical Ltd | Health & social care | 2015 |
| Luna Soul Limited | Wholesale & retail | 2020 |
| Lunbio Consulting Limited | Professional & scientific | 2023 |
| Lundholm Invest Limited | Real estate | 2021 |
| Lunea Cosmetics Limited | Wholesale & retail | 2024 |
| Lunigo Ltd | Wholesale & retail | 2019 |
| Lupi Build & Roofing Ltd | Construction | 2026 |
| Lupito Ltd | Wholesale & retail | 2023 |
| Luqs Ltd | Transport & logistics | 2023 |
| Lushington Associates Limited | Professional & scientific | 2002 |
| Lusitania Transport Ltd | Transport & logistics | 2022 |
| Lutalo Muhammad Elite Sports Limited | Arts & recreation | 2017 |
| Lutin Technologies Ltd | Information & communication | 2024 |
| LUX Drone Systems Ltd | Agriculture & fishing | 2026 |
| LUX Orbit Ltd | Professional & scientific | 2022 |
| Luxe Ceylon Limited | Wholesale & retail | 2024 |
| Luxetanningcompany Limited | Other services | 2026 |
| Luxexpresswash Ltd | Wholesale & retail | 2025 |
| Luxman-Uk Ltd | Transport & logistics | 2022 |
| Luxmov Ltd | Wholesale & retail | 2023 |
| Luxomarket Ltd | Wholesale & retail | 2026 |
| Luxora Cars Ltd | Transport & logistics | 2026 |
| Luxora Group Ltd | Wholesale & retail | 2024 |
| Luxpoker Limited | Manufacturing | 2024 |
| Luxury Highland Transports Limited | Hospitality | 2016 |
| Luxury New Homes Ltd | Real estate | 2021 |
| LWB Legal Services Ltd | Professional & scientific | 2023 |
| LWW Consultancy Ltd | Professional & scientific | 2024 |
| LX Construction Limited | Construction | 2013 |
| Lycos Electrical Services Ltd | Construction | 2020 |
| Lydia Walmsley Racing Ltd | Arts & recreation | 2022 |
| Lyme Regis Cottage Ltd | Hospitality | 2012 |
| Lyn's Care Services Ltd | Health & social care | 2019 |
| Lynda Sale Consulting LLP | | 2007 |
| Lynden Property Company Limited | Real estate | 1992 |
| Lynett Commercial Facilities Limited | Administrative & support | 2020 |
| Lynett Commercial Limited | Administrative & support | 2014 |
| Lynette Allen Ltd | Health & social care | 2018 |
| Lynford by the Water Ltd | Hospitality | 2026 |
| Lyngdorf UK Limited | Wholesale & retail | 2021 |
| Lynne Hair and Beauty Ltd | Other services | 2021 |
| Lynnplan Ltd | Wholesale & retail | 2025 |
| Lynton Place (Ipswich) Management Company Limited | Households | 2026 |
| Lyralearn Limited | Professional & scientific | 2024 |
| M & a Lettings Limited | Real estate | 2016 |
| M & a Property Developments Limited | Construction | 2017 |
| M & J B Logistic Solutions Limited | Transport & logistics | 2020 |
| M & J Escapes Ltd | Hospitality | 2026 |
| M & K Hedges-Quinn Properties Ltd | Real estate | 2022 |
| M & L - Services Ipswich Ltd | Construction | 2015 |
| M & M Timberworks Limited | Construction | 2014 |
| M & O Global Limited | Wholesale & retail | 2023 |
| M & S Contractors (E.A.) Holdings Limited | Financial services | 2014 |
| M & S Contractors (E.A.) Limited | Construction | 1992 |