| KRN Services Ltd | Administrative & support | 2017 |
| KS Motors Ltd | Wholesale & retail | 2024 |
| KS Properties Midlands Limited | Real estate | 2020 |
| KSX Construction Ltd | Construction | 2026 |
| Kuka Robotics UK Ltd | Manufacturing | 2011 |
| Kumar Courier Limited | Transport & logistics | 2021 |
| KVK Deliveries Ltd | Transport & logistics | 2023 |
| KW Business Supplies & Services Limited | Administrative & support | 2025 |
| Kymo Ltd | Transport & logistics | 2022 |
| KZ Organics Ltd | Wholesale & retail | 2021 |
| L & S Home Improvements Ltd | Construction | 2022 |
| L a M Installations Ltd | Manufacturing | 2018 |
| L G Electrical Contractor Ltd | Construction | 2009 |
| L M S Freightways Limited | Transport & logistics | 2020 |
| L&B Perrins Ltd | Construction | 2017 |
| L&H Transport Ltd | Transport & logistics | 2020 |
| L&M Electrical Services Ltd | Construction | 2011 |
| L&R Home Improvements Ltd | Construction | 2025 |
| L&S Prestige Properties Ltd | Real estate | 2022 |
| L. Harris WM Ltd | Construction | 2022 |
| L.A. Business Solutions Ltd | Professional & scientific | 2026 |
| L.A. Nicholls Photography Ltd | Professional & scientific | 2021 |
| L.C.H. Building Solutions Ltd | Construction | 2026 |
| L.P. Business Services Ltd | Construction | 2025 |
| LA Couronne Belle Ltd | Wholesale & retail | 2026 |
| LA Studios Ltd | Arts & recreation | 2022 |
| Lally Transport Ltd | Transport & logistics | 2024 |
| Lamaar Lawrence Design Studio Limited | Professional & scientific | 2025 |
| Lane Almeida Limited | Real estate | 2025 |
| Lang Investment Services Limited | Construction | 2013 |
| Larchick Ltd | Health & social care | 2021 |
| Lauren Wiggins Limited | Other services | 2022 |
| Lavi Motors Ltd | Transport & logistics | 2018 |
| Lavish Exclusives UK Limited | Wholesale & retail | 2016 |
| Lawley Lexicon Ltd | Extraterritorial | 2023 |
| Lazar Cleans Limited | Administrative & support | 2025 |
| LB Express Ltd | Hospitality | 2025 |
| LC Philip Limited | Other services | 2014 |
| LCB Scaffolding Ltd | Construction | 2016 |
| LCF Interiors Limited | Wholesale & retail | 2024 |
| LCR Group Ltd | Administrative & support | 2024 |
| LCS Office Supplies Limited | Construction | 2016 |
| LE Family Kitchen Ltd | Hospitality | 2024 |
| LE Shisha Limited | Hospitality | 2018 |
| Leabrook Health Ltd | Health & social care | 2015 |
| Learnology Consulting Limited | Administrative & support | 2014 |
| Ledit Group Ltd | Administrative & support | 2023 |
| Lees Builders Ltd | Construction | 2022 |
| Leisure Air Ltd | Construction | 2019 |
| LEO DEI Ltd | Wholesale & retail | 2024 |
| Leonestar Cleaning Company Ltd | Administrative & support | 2025 |
| LET to YOU Ltd | Real estate | 2019 |
| Levara Technologies Ltd | Information & communication | 2026 |
| Levels Gym Bridgnorth Ltd | Arts & recreation | 2023 |
| Lgjr Holdings Limited | Financial services | 2012 |
| Licsjy Ltd | Wholesale & retail | 2026 |
| Likhon Taxi Ltd | Transport & logistics | 2024 |
| Limitoweb Technologies Ltd | Information & communication | 2019 |
| Limo Plus International UK Ltd | Health & social care | 2024 |
| Linford Holdings Limited | Financial services | 2025 |
| Link 21 Ltd | Wholesale & retail | 2008 |
| Link UP Kitchens & Bedrooms Ltd | Construction | 2015 |
| Liquidec Limited | Wholesale & retail | 2017 |
| Little Legend Nurseries Ltd | Education | 2012 |
| Liveway Healthcare Ltd | Health & social care | 2024 |
| Living Smart Deals Ltd | Wholesale & retail | 2025 |
| Living Word Outreach Ministries | Other services | 2008 |
| Livingston Property Company Limited | Real estate | 2004 |
| Ljbusiness Ltd | Wholesale & retail | 2025 |
| Ll-Labs Ltd | Professional & scientific | 2016 |
| LM Executive Chauffeur Ltd | Transport & logistics | 2025 |
| LM Western Ltd | Wholesale & retail | 2023 |
| LMD Insulations Ltd | Construction | 2025 |
| Lockings Carpentry Limited | Manufacturing | 2023 |
| Lodhi Limited | Real estate | 2021 |
| Logan Media Marketing Ltd | Professional & scientific | 2023 |
| Lone Star Grange Limited | Manufacturing | 2002 |
| Lone Star Holdings UK Limited | Administrative & support | 2006 |
| Lone Star Leeds Limited | Manufacturing | 1941 |
| Lone Star PRD Group Limited | Administrative & support | 1996 |
| Lonestar Fasteners Europe Limited | Manufacturing | 1983 |
| Lonestar Fasteners Hydrobolt Limited | Manufacturing | 2001 |
| Lonestar UK Holdco Limited | Manufacturing | 2007 |
| Longmore Steel Erecting Ltd. | Construction | 2000 |
| Lotus Meal Limited | Hospitality | 2022 |
| Lotus of Life Ltd | Health & social care | 2022 |
| Louane Jones Limited | Wholesale & retail | 2025 |
| Love My Event Ltd | Other services | 2017 |
| Lovedeep Studio Ltd | Information & communication | 2025 |
| Lovell Catering Ltd | Hospitality | 2022 |
| Lovell Trucks (Holdings) Limited | Financial services | 2020 |
| Lovell Trucks Limited | Wholesale & retail | 2012 |
| Lowe and Fletcher (Wednesbury) Limited | Manufacturing | 1974 |
| Loxa Holdings WM Ltd | Financial services | 2025 |
| Loxa Properties Ltd | Construction | 2025 |
| LP SD Forty One Limited | Wholesale & retail | 2023 |
| LPZ Sales Consultant Limited | Wholesale & retail | 2021 |
| LRK Services & Solutions Limited | Wholesale & retail | 2025 |
| LSP Acquisition (UK) Ltd | Professional & scientific | 2010 |
| LSP Investco Limited | Financial services | 2016 |