| Levingtons Cleaning Solutions Ltd | Administrative & support | 2025 |
| Levyta Partnership Solutions Limited | Professional & scientific | 2025 |
| LEW & Co Properties Ltd | Real estate | 2025 |
| LEW Wealth Management Ltd | Financial services | 2016 |
| Lewis Manufacturing Services Limited | Wholesale & retail | 1974 |
| Lewis O Renovations Ltd | Real estate | 2026 |
| LEWIS11 Limited | Construction | 2011 |
| Lewisam Properties Ltd | Real estate | 2024 |
| Lewisg Plumbing Services Ltd | Construction | 2025 |
| Lewiswainservices Limited | Construction | 2025 |
| Lex-Tek Autos Ltd | Wholesale & retail | 2015 |
| Lexell Ltd | Construction | 2016 |
| Lexelle Assistance Ltd | Financial services | 1996 |
| Lexelle Limited | Administrative & support | 1996 |
| Lexicon Tax Ltd | Professional & scientific | 2021 |
| Lexip Ltd | Arts & recreation | 2020 |
| Lexmed Ltd | Health & social care | 2021 |
| LF Consultants Ltd | Professional & scientific | 2026 |
| LF Property Limited | Real estate | 2016 |
| Lfbb (Services) Limited | Financial services | 2014 |
| Lfem. Limited | Wholesale & retail | 2025 |
| Lfmg Limited | Wholesale & retail | 2022 |
| LFN Building Services Ltd | Construction | 2024 |
| LFP Solutions Limited | Construction | 2025 |
| LG Worx Ltd | Wholesale & retail | 2025 |
| LG05 Consulting Ltd | Professional & scientific | 2025 |
| LGA Comms Limited | Information & communication | 2015 |
| LGA Investments Limited | Real estate | 2018 |
| LGA Lucart Ltd | Transport & logistics | 2024 |
| Lggconsulting Ltd | Professional & scientific | 2016 |
| LGR Property Management Limited | Real estate | 2023 |
| LGS Property Estates Limited | Real estate | 2017 |
| LGV Yorkshire Direct Ltd | Administrative & support | 2017 |
| LH Building Services & Property Management Ltd | Professional & scientific | 2023 |
| LH Caravan and Lodge Hire Ltd | Hospitality | 2026 |
| LH Express Ltd | Transport & logistics | 2025 |
| LH Nget Grid Services Limited | Energy | 2023 |
| Lhea Terzaki Media Ltd | Professional & scientific | 2026 |
| Lhlm Property Holdings Limited | Financial services | 2023 |
| LHQ Ltd | Wholesale & retail | 2026 |
| Lhsl 2 Limited | Extraterritorial | 2018 |
| Lhumb Consultancy Limited | Professional & scientific | 2024 |
| LHX Joinery Ltd | Construction | 2025 |
| LI Building Construction Limited | Construction | 2013 |
| LI Services Limited | Wholesale & retail | 2020 |
| LI Software Ltd | Information & communication | 2017 |
| LIA Beauty World Ltd | Other services | 2025 |
| Liabaestates Ltd | Real estate | 2025 |
| Liam Bacon Ltd | Construction | 2013 |
| Liam Boyle Ltd | Wholesale & retail | 2025 |
| Liam Food Ltd | Wholesale & retail | 2024 |
| Liam Food S5 Ltd | Hospitality | 2024 |
| Liam FOX Creative Limited | Arts & recreation | 2019 |
| Lianika Ltd | Wholesale & retail | 2025 |
| Libertine FPE Limited | Administrative & support | 2009 |
| Liberty Community Living CIC | Real estate | 2025 |
| Libnella Property Limited | Real estate | 2024 |
| Libra Chemicals Limited | Financial services | 2006 |
| Libra Speciality Chemicals Limited | Manufacturing | 1971 |
| Libre Digital | Information & communication | 2010 |
| Lick of Paint Festival C.I.C. | Arts & recreation | 2023 |
| LID Construction Ltd | Construction | 2024 |
| Lidgett Grange Management Company Limited | Real estate | 2005 |
| Lidster Paragon Tool Co. Limited(The) | Manufacturing | 1974 |
| Lidya Property Ltd | Real estate | 2025 |
| Life & Style Ltd | Hospitality | 2021 |
| Life After Crisis Global Organisation Community Interest Company | Health & social care | 2020 |
| Life and Lemons Health Ltd | Health & social care | 2019 |
| Life Expressions (UK and Europe) Limited | Other services | 2016 |
| Life IS a Lemon Ltd | Hospitality | 2018 |
| Life IS Balance Limited | Wholesale & retail | 2014 |
| Life Rescue Ministries | Other services | 2012 |
| Life Vitamins Ltd | Wholesale & retail | 2023 |
| Lifeblood Analytics Ltd | Professional & scientific | 2024 |
| Lifelong Learning Limited | Education | 2015 |
| Lifeskills LSC Limited | Education | 2025 |
| Lifesphere Collective Ltd | Arts & recreation | 2025 |
| Lifestyle 180 Limited | Administrative & support | 2023 |
| Lifestyle Car Sale Limited | Wholesale & retail | 2018 |
| Lifestyle Gold Limited | Real estate | 1998 |
| Lifestyle Mortgage Centres Limited | Financial services | 2001 |
| Lifestyle on Demand Limited | Wholesale & retail | 2017 |
| Lifestyle Partitions and Furniture Limited | Extraterritorial | 1923 |
| Lifestyle Travel Club Limited | Administrative & support | 1997 |
| Lifft Slings (2015) Limited | Manufacturing | 2015 |
| Lift Learn & Burn Ltd | Arts & recreation | 2022 |
| Lifting Gear Products Limited | Manufacturing | 2006 |
| Light Club Tanning Limited | Other services | 2026 |
| Light of GOD Evangelical Ministries Worldwide Limited | Other services | 2007 |
| Light of Hope Care Limited | Health & social care | 2025 |
| Light Peer Support Ltd | Health & social care | 2012 |
| Lightforge Academy Ltd | Education | 2019 |
| Lightguard Investments Ltd | Real estate | 2017 |
| Lighthouse Vending Limited | Hospitality | 2010 |
| Lighting Productions Limited | Arts & recreation | 2009 |
| Lightmain Company Limited | Manufacturing | 2015 |
| Lightning Maths Ltd | Wholesale & retail | 2019 |
| Lightpathb Ltd | Information & communication | 2023 |
| Lightwater (Mechanical) Ltd | Construction | 2015 |
| Lightwood Sports Groundcare Ltd | Administrative & support | 2016 |