| Lloyd Sellen Cleaning Ltd | Administrative & support | 2014 |
| Lloyd Vine Limited | Financial services | 2019 |
| Lloyd Vine Property Ltd. | Real estate | 1999 |
| Lloyds Legacy Limited | Construction | 2025 |
| LLS Courier Services Limited | Transport & logistics | 2022 |
| Llscaffolding Ltd | Construction | 2023 |
| LLT Property's Ltd | Real estate | 2026 |
| Llunio Ltd | Financial services | 2021 |
| Llyannauram Ltd | Administrative & support | 2022 |
| Llynramaurora Limited | Administrative & support | 2026 |
| LM Complete Ltd | Financial services | 2023 |
| LM Direct Recruitment Services Limited | Administrative & support | 2017 |
| LM Solutions (Europe) Limited | Construction | 2009 |
| LM Strategic Advisory Limited | Professional & scientific | 2025 |
| LMC High Performance Centre Ltd | Arts & recreation | 2021 |
| LMF Marine Ltd | Professional & scientific | 2023 |
| LMH Property Services Limited | Real estate | 2014 |
| LMJ Cleaning & Renovation Services Ltd | Administrative & support | 2021 |
| LML 888 Ltd | Hospitality | 2025 |
| LML Surveying Limited | Professional & scientific | 2015 |
| LMR Building Services Limited | Construction | 2010 |
| LMR Distribution Limited | Transport & logistics | 2017 |
| LMZ Builders Limited | Construction | 2025 |
| LN & KS Property Limited | Real estate | 2022 |
| LN & NS Property Limited | Real estate | 2021 |
| LNA Comfort Ltd | Transport & logistics | 2020 |
| LNA Communications Limited | Information & communication | 2016 |
| LNA Harvey Property Limited | Real estate | 2020 |
| LNG Supplies Ltd | Wholesale & retail | 2025 |
| Lnns Rose Limited | Real estate | 2022 |
| LNP Southern Limited | Extraterritorial | 2014 |
| LNX Connect Limited | Information & communication | 2024 |
| Load & Go Clearance Ltd | Water & waste | 2026 |
| Load US UP Limited | Professional & scientific | 2026 |
| Loader Investments Limited | Extraterritorial | 2018 |
| Loades Farming Limited | Agriculture & fishing | 2021 |
| LOC-8 Electrical Limited | Construction | 2020 |
| Local Shop (Southampton) Ltd | Wholesale & retail | 2025 |
| Local Surveyors Direct Limited | Professional & scientific | 2004 |
| LOCAL2GLOBAL Limited | Information & communication | 2025 |
| Localpurpose Property Management Limited | Households | 1995 |
| Locate Supplies Limited | Wholesale & retail | 1989 |
| Locate Your Look Ltd | Other services | 2017 |
| Lock 5 Limited | Manufacturing | 2020 |
| Lock Four Ltd | Wholesale & retail | 2025 |
| Lock My BAG Limited | Other services | 2026 |
| Locker and Storage Ltd | Transport & logistics | 2024 |
| Lockett Builders Ltd | Construction | 2026 |
| Lockhams Engineering Limited | Construction | 2017 |
| Lockhams Highways Limited | Construction | 2017 |
| Lockhams Recycling Limited | Water & waste | 2015 |
| Lockmasters Limited | Administrative & support | 1973 |
| Locks Heath Day Care Trust | Health & social care | 1995 |
| Locks Heath Park Road (NO.1) Limited | Real estate | 2003 |
| Locks Heath Removals Limited | Transport & logistics | 2012 |
| Lockset Limited | Professional & scientific | 1989 |
| Locksheath Hire Centre Limited | Administrative & support | 2012 |
| Locksley Court RTM Company Limited | Households | 2024 |
| Locksridge Limited Liability Partnership | | 2018 |
| Lockswood Homes Ltd | Construction | 2024 |
| Loco Toro Ltd | Manufacturing | 2022 |
| Lodge Bookkeeping Ltd | Professional & scientific | 2025 |
| Lofteaze Ltd | Professional & scientific | 2022 |
| Loftfoam Ltd | Construction | 2021 |
| Logic Ethos Limited | Information & communication | 2009 |
| Logical Search & Select Ltd | Administrative & support | 2025 |
| Logicexpress Ltd | Transport & logistics | 2023 |
| Logicfoam Limited | Wholesale & retail | 2021 |
| Logicpower Ltd | Extraterritorial | 2022 |
| Logicseal Limited | Wholesale & retail | 2021 |
| Logiforce Talent Limited | Administrative & support | 2025 |
| Logistical Building Services (Electrical) Limited | Construction | 1999 |
| Logistical Building Services Holdings Limited | Financial services | 2020 |
| Logisticore Technologies Ltd | Information & communication | 2025 |
| Logistics@Legacy Ltd | Wholesale & retail | 2015 |
| Logit Services Ltd | Transport & logistics | 2016 |
| Logiva Limited | Wholesale & retail | 2025 |
| LOH Masala Limited | Hospitality | 2025 |
| LOJ Art Limited | Arts & recreation | 2026 |
| Loki New ERA Ltd | Construction | 2025 |
| Lokyog Software Engineers Ltd. | Information & communication | 2015 |
| Lolaphoenixdesigns Limited | Wholesale & retail | 2024 |
| Lolas Logs Ltd | Wholesale & retail | 2025 |
| Lomas Consulting Ltd | Professional & scientific | 2025 |
| London & Hampshire Anxiety Clinics Limited | Health & social care | 2019 |
| London Cleaning Specialist Ltd | Extraterritorial | 2019 |
| London Fashion Concierge Limited | Professional & scientific | 2018 |
| London Gatwick Care Limited | Hospitality | 2024 |
| London Mini Market Ltd | Wholesale & retail | 2025 |
| London Road (ST. Albans) Management Company Limited | Households | 1989 |
| London South Property Management Ltd | Households | 2017 |
| Lonepiper Properties Limited | Real estate | 2011 |
| Lonestar QA Limited | Information & communication | 2017 |
| Long Lane Land Management Limited | Administrative & support | 2017 |
| Long Spoon Ltd | Health & social care | 2018 |
| Long Time NOO SEE Ltd | Other services | 2024 |
| Longbridge Wines & Spirits Ltd | Wholesale & retail | 2018 |
| Longdown Activity Farm Limited | Agriculture & fishing | 2004 |
| Longdown Management Limited | Construction | 1977 |
| Longley Sales Academy Ltd | Professional & scientific | 2015 |