| Livin OM Ltd | Households | 2023 |
| Living Corporation Ltd | Wholesale & retail | 2024 |
| Living North Limited | Information & communication | 1999 |
| Living Sense Limited | Wholesale & retail | 2021 |
| Living UP North Ltd | Real estate | 2023 |
| Livingspace@Kitui Limited | Other services | 2017 |
| Livitay Ltd | Administrative & support | 2018 |
| Livwell Private Limited | Real estate | 2026 |
| LIZ Consulting Ltd | Professional & scientific | 2021 |
| Lizland Limited | Real estate | 2007 |
| Lizlei Limited | Health & social care | 2023 |
| LJ Tanney Limited | Real estate | 2025 |
| LJ13 Property Ltd | Real estate | 2022 |
| LJC Property Management Ltd | Real estate | 2023 |
| Ljei Engineering Consulting Limited | Professional & scientific | 2023 |
| LJL Rope Access Ltd | Professional & scientific | 2016 |
| LJO Limited | Households | 2025 |
| LJO Recruitment Ltd | Administrative & support | 2025 |
| LJP Prescribing Ltd | Administrative & support | 2025 |
| LJR9 Limited | Administrative & support | 2016 |
| LJS Joinery North East Ltd | Construction | 2024 |
| LJT Wind Power Services Ltd | Construction | 2026 |
| LK Consultant Services Ltd | Other services | 2025 |
| LK Consulting Limited | Administrative & support | 2024 |
| Lk.Aesthetics Wholesale Supplies Ltd | Wholesale & retail | 2025 |
| LKB Consultancy Ltd | Professional & scientific | 2023 |
| LLA Investments Limited | Real estate | 2020 |
| Llantrisant Sunjuice 1 Ltd | Extraterritorial | 2006 |
| Llantrisant Sunjuice 2 Ltd | Extraterritorial | 2006 |
| Llck Ltd | Information & communication | 2024 |
| LLJ Holding Company Limited | Construction | 2022 |
| Lloyd Bodyshop Newcastle Limited | Extraterritorial | 1971 |
| LLS Properties Limited | Real estate | 2018 |
| LLT Developments Limited | Real estate | 2016 |
| LLT Properties Ltd | Real estate | 2013 |
| LLT Retail Developments Ltd | Real estate | 2021 |
| LM Aesthetics Limited | Health & social care | 2025 |
| LM Auto FIX Limited | Wholesale & retail | 2026 |
| LM Business Consulting Ltd | Professional & scientific | 2024 |
| LM Global Group Holdings Ltd | Real estate | 2024 |
| LM Global Group Ltd | Information & communication | 2022 |
| LM Global Solutions Ltd | Information & communication | 2025 |
| LM Global Technology Ltd | Information & communication | 2023 |
| LM MOT Ltd | Wholesale & retail | 2026 |
| LM Plumbing & Heating Ltd | Construction | 2023 |
| LM Supplies Ltd | Wholesale & retail | 2024 |
| LM88 Ltd | Hospitality | 2024 |
| LMC Multitrades Ltd | Construction | 2025 |
| LMD Training Limited | Health & social care | 2022 |
| LMF Design Ltd | Professional & scientific | 2025 |
| LMH Engineering (North East) Limited | Manufacturing | 2021 |
| LMP Commercial Ltd | Professional & scientific | 2025 |
| LMUK1 Ltd | Hospitality | 2024 |
| Lndp Surgical Services Limited | Health & social care | 2025 |
| Lnrd Ltd | Professional & scientific | 2025 |
| Load & Go North East Ltd | Water & waste | 2026 |
| Loaded & Grill Ltd | Hospitality | 2025 |
| Loaded Treatz Limited | Hospitality | 2025 |
| Loadmaster Industries Limited | Administrative & support | 2024 |
| Loadtech Electrical Ltd | Construction | 2018 |
| Loam and Lore Limited | Wholesale & retail | 2022 |
| Loblack Group Ltd | Financial services | 2022 |
| Local Building Solutions NE Ltd | Construction | 2023 |
| Local Gifts Limited | Wholesale & retail | 2025 |
| Local Heroes Storytelling CIC | Information & communication | 2026 |
| Local NCL Ltd | Hospitality | 2020 |
| Local Storage Services Limited | Transport & logistics | 2021 |
| Localis AI Limited | Information & communication | 2026 |
| Lock Shop Direct Ltd | Wholesale & retail | 2019 |
| Lockhart Living Ltd | Real estate | 2026 |
| Locking & Security Solutions Limited | Manufacturing | 2001 |
| Lockyer Family Investment Co | Financial services | 2022 |
| Locomotion Business Park Limited | Real estate | 2020 |
| Locus + | Arts & recreation | 1994 |
| Lodge Properties (Holywell) Limited | Professional & scientific | 2003 |
| Lodge Rentals Ltd | Hospitality | 2026 |
| LOF NCL Limited | Wholesale & retail | 2023 |
| Loft Music Ltd | Information & communication | 2022 |
| Loft Productions LLP | | 2003 |
| Loftus Healthcare Ltd | Wholesale & retail | 2021 |
| LOG4HEALTH Ltd | Professional & scientific | 2019 |
| Loggia Capital Partners Ltd | Administrative & support | 2014 |
| Logical Fire Services Ltd | Manufacturing | 2023 |
| Logical Holdings Limited | Administrative & support | 2018 |
| Logincident Limited | Information & communication | 2012 |
| Logobear Limited | Wholesale & retail | 2016 |
| Loki & Bean Limited | Wholesale & retail | 2022 |
| Lola's Loft Limited | Hospitality | 2021 |
| Lolface Ltd | Other services | 2021 |
| LOM Consultancy Ltd | Construction | 2019 |
| Lomisa Ltd | Hospitality | 2018 |
| London & Birmingham Railway Limited | Transport & logistics | 2006 |
| London & South Eastern Railway Limited | Transport & logistics | 2003 |
| London and Wales Corporate Business Ltd | Wholesale & retail | 2011 |
| London Breading Company Ltd | Wholesale & retail | 2026 |
| London Central BUS Company Limited | Professional & scientific | 1988 |
| London Chauffeur & Concierge Service Limited | Transport & logistics | 2016 |
| London Cornwall Property Partners Ltd | Construction | 2007 |
| London Cornwall Student Investments Ltd | Administrative & support | 2011 |
| London General Transport Services Limited | Transport & logistics | 1988 |