| Kyla's Cafe Ltd | Hospitality | 2022 |
| Kynaston Contract Services Ltd | Construction | 2013 |
| Kynergy Ltd | Energy | 2022 |
| KZN Investments Limited | Financial services | 2023 |
| L & C Management Company Limited | Professional & scientific | 2005 |
| L & J Property Services Limited | Construction | 2023 |
| L & J Rentals Limited | Real estate | 2024 |
| L & M Investment Group Limited | Real estate | 2020 |
| L & N Developments Limited | Construction | 2021 |
| L & S Property Rental Limited | Real estate | 2017 |
| L a Simblet Stonework Ltd | Construction | 2023 |
| L and K Bayside Ltd | Real estate | 2024 |
| L B J Jewellery Ltd | Wholesale & retail | 2010 |
| L B Plant Ltd | Wholesale & retail | 2020 |
| L Banfield Consultancy Limited | Construction | 2019 |
| L D Connolly & Sons Ltd | Construction | 2022 |
| L E Glennon Building & Carpentry Limited | Construction | 2017 |
| L E Groundworks Ltd | Construction | 2021 |
| L J Kingsbury Accounts Limited | Professional & scientific | 2012 |
| L J Thomason Limited | Construction | 2005 |
| L M HAY Limited | Health & social care | 2026 |
| L M Manufacturing Limited | Information & communication | 2014 |
| L Ruszak Trading Ltd | Wholesale & retail | 2023 |
| L Ruszak Transport Ltd | Transport & logistics | 2022 |
| L S M Limited | Manufacturing | 1979 |
| L Spence Haulage Ltd | Transport & logistics | 2020 |
| L&A Art Studio Ltd | Other services | 2019 |
| L&A Care Solutions Ltd | Health & social care | 2014 |
| L&C Electronics Ltd | Other services | 2025 |
| L&C Global Services Ltd | Wholesale & retail | 2026 |
| L&D Food Limited | Hospitality | 2023 |
| L&I Properties Ltd | Real estate | 2020 |
| L&L Astra Ltd | Wholesale & retail | 2025 |
| L&P Blythe Ltd | Wholesale & retail | 2014 |
| L&P Property Management Consultancy Ltd | Real estate | 2012 |
| L&P Real Estate Limited | Real estate | 2016 |
| L&P Supreme Services Limited | Wholesale & retail | 2014 |
| L&S Brown Estates Ltd | Households | 2026 |
| L. Drover Conservation Limited | Professional & scientific | 2003 |
| L.D. Design&Build Ltd | Construction | 2017 |
| L.K Tech & Events Ltd | Administrative & support | 2021 |
| L.N.P. Distribution Ltd. | Wholesale & retail | 2011 |
| L.S.M. Pianos Limited | Wholesale & retail | 2025 |
| L.V.A Construction Limited | Construction | 2015 |
| L2 Golf Consulting Limited | Arts & recreation | 2022 |
| L2 Homes Limited | Real estate | 2018 |
| L2V Trans Ltd | Transport & logistics | 2023 |
| L3R Investments Ltd | Real estate | 2024 |
| LA Buildmasters Ltd | Construction | 2024 |
| LA Cafe DE Ltd | Hospitality | 2025 |
| LA CAN Construction Ltd | Construction | 2024 |
| LA Eire Ltd | Hospitality | 2022 |
| LA Famiglia Northampton Ltd | Hospitality | 2025 |
| LA Ferme London Ltd. | Wholesale & retail | 2012 |
| LA Grasu Limited | Construction | 2023 |
| LA Pazienza Ltd | Hospitality | 2015 |
| LA Popa Ltd | Wholesale & retail | 2017 |
| LA Romanas Limited | Wholesale & retail | 2025 |
| LA Sasu Ltd | Transport & logistics | 2026 |
| LA Scafolding Ltd | Construction | 2017 |
| LA Skin Academy Ltd | Education | 2026 |
| LA Tatutu CU Gust Ltd | Hospitality | 2023 |
| LA Terraza Upton Ltd | Hospitality | 2018 |
| LA Tiella Ltd | Hospitality | 2023 |
| LA Torre Coalville Limited | Hospitality | 2014 |
| LA Vida Haute TON Limited | Wholesale & retail | 2024 |
| LA Volpe Volante Ltd | Wholesale & retail | 2024 |
| LAB Hair Limited | Other services | 2018 |
| LAB Works Engineering Limited | Wholesale & retail | 2023 |
| Label Solutions Limited | Manufacturing | 2001 |
| Labs Clinic Limited | Health & social care | 2012 |
| LAC Northampton Limited | Administrative & support | 2019 |
| Lace Build Ltd | Construction | 2025 |
| Laces Direct Limited | Wholesale & retail | 2004 |
| Lacour UK Limited | Financial services | 2024 |
| Lactodorum Contracts Limited | Construction | 2002 |
| LAD Logistics Ltd | Transport & logistics | 2014 |
| Ladfadun Global Link Ltd | Health & social care | 2019 |
| Lads Chemist Limited | Wholesale & retail | 2003 |
| Lady and Gent Gym Limited | Wholesale & retail | 2018 |
| Ladywell Park Management Company Limited | Households | 2012 |
| LAF Utilities Ltd | Construction | 2025 |
| Lahdidah Productions Limited | Information & communication | 2002 |
| Lahman Ltd | Transport & logistics | 2019 |
| Laila Al-Humaidhi Limited | Manufacturing | 2023 |
| Laisvo ORO Ltd | Transport & logistics | 2018 |
| Lake Link Ltd | Administrative & support | 2022 |
| Lakeane Ltd | Hospitality | 2023 |
| Lakefield Consultancy Ltd | Professional & scientific | 2024 |
| Lakefield Group Holdings Limited | Construction | 2025 |
| Lakehall Ltd | Professional & scientific | 2022 |
| Lakehouse Entertainment Ltd | Arts & recreation | 2024 |
| Lakeside Buckingham Stone Limited | Manufacturing | 2010 |
| Lakeside Dallington Management Limited | Households | 2021 |
| Lakeside Management Company (Daventry) Limited | Households | 2006 |
| Lakeside Preservation Limited | Administrative & support | 1990 |
| Lakeside RTM Company Ltd | Extraterritorial | 2012 |
| Lakewood Meadows Residents Management Company Limited | Households | 2026 |
| Laks Consulting Limited | Administrative & support | 2014 |
| Laks Retail Ltd | Wholesale & retail | 2026 |