| Kristof Sikorski Ltd | Manufacturing | 2018 |
| Kristy G Ltd | Administrative & support | 2026 |
| Krito Solutions Ltd | Administrative & support | 2018 |
| Krpit Ltd | Information & communication | 2022 |
| Kses Limited | Construction | 2015 |
| KSL Mechanical Ltd | Professional & scientific | 2020 |
| KSN Property Ltd | Real estate | 2021 |
| KSP Trading Ltd | Wholesale & retail | 2025 |
| KSS Logistics Limited | Transport & logistics | 2024 |
| Kssw Services Ltd | Construction | 2025 |
| KT Empire Deals Ltd | Wholesale & retail | 2025 |
| KTI Consultants Limited | Professional & scientific | 2020 |
| Kuba Libre Media Ltd | Information & communication | 2024 |
| Kudos Design Limited | Professional & scientific | 2009 |
| Kufersin & Company Limited | Other services | 2017 |
| Kumo Wear Ltd | Wholesale & retail | 2025 |
| Kuvare Care Ltd | Health & social care | 2025 |
| KV Beauty Ltd | Other services | 2017 |
| KV Hair Limited | Other services | 2018 |
| KW Local Ltd | Real estate | 2025 |
| KW Rail Limited | Construction | 2023 |
| KWA Fabrications & Metals Ltd | Manufacturing | 2025 |
| KWE KWE Fit Ltd | Professional & scientific | 2026 |
| Kwparts Ltd | Wholesale & retail | 2023 |
| Kyle Egan Limited | Construction | 2026 |
| Kyna Solutions Ltd | Information & communication | 2014 |
| Kyoto Distribution Ltd | Wholesale & retail | 2024 |
| KZS Properties Limited | Real estate | 2026 |
| L & L Forecourts Civil Engineering Limited | Construction | 2021 |
| L & M Packaging Ltd | Administrative & support | 2020 |
| L & M Property Solutions Ltd | Real estate | 2025 |
| L & T Metals Limited | Water & waste | 2015 |
| L and K Interior Contract Services Ltd | Construction | 2023 |
| L F Property Services Limited | Real estate | 2017 |
| L H UK Electrics Ltd | Construction | 2023 |
| L Irving Construction Ltd | Construction | 2025 |
| L J Leisure (Travel) Limited | Administrative & support | 2002 |
| L Moore Ltd | Construction | 2023 |
| L Richards Home Ventures Ltd | Real estate | 2026 |
| L Sykes Limited | Financial services | 2012 |
| L&D Group Ltd | Education | 2022 |
| L&J Interior Systems Ltd | Construction | 2024 |
| L&Mm Construction Ltd | Professional & scientific | 2025 |
| L&Mm Foods Limited | Hospitality | 2025 |
| L&R Safety Ltd | Public administration | 2018 |
| L. Saddington Ltd | Administrative & support | 2025 |
| L.A Security Solutions Ltd | Administrative & support | 2025 |
| L.A Training Ltd | Education | 2024 |
| L.C.T (GB) Limited | Manufacturing | 1989 |
| LA Belle Dame Limited | Other services | 2017 |
| LA Commodities Ltd | Wholesale & retail | 2024 |
| LA Foundations Groundworks Limited | Construction | 2017 |
| LA Informatics Limited | Information & communication | 2017 |
| LA Pondicherry at Stag Ltd | Hospitality | 2019 |
| LA Pondicherry Ltd | Hospitality | 2015 |
| LA Properties (South Yorkshire) Ltd | Real estate | 2024 |
| LA Rigging Limited | Manufacturing | 2015 |
| LA Roca Latinos Church Ltd | Other services | 2020 |
| LA Sandy Ltd | Wholesale & retail | 2021 |
| Labella Brows Limited | Other services | 2025 |
| Labflex Limited | Manufacturing | 1990 |
| Labmak Ltd | Wholesale & retail | 2023 |
| Labour Managed Solutions Ltd | Extraterritorial | 2019 |
| Labtech International Ltd | Wholesale & retail | 1993 |
| Laco 3 Limited | Construction | 2017 |
| LAD Cladding Systems Limited | Construction | 2013 |
| Lady Luxe Private Hire Limited | Transport & logistics | 2025 |
| Ladyoak Properties Limited | Real estate | 2017 |
| LAE Properties Ltd | Real estate | 2021 |
| Laiou Kampanis Productions Ltd | Hospitality | 2023 |
| Lake END Management Limited | Professional & scientific | 2013 |
| Lakehaven Limited | Hospitality | 2019 |
| Lakeside Industrial Supplies Ltd | Wholesale & retail | 2012 |
| Lakeside Joinery& Building Maintenance Limited | Construction | 2014 |
| Lakeside View (Greasbrough) Management Company Ltd | Households | 2018 |
| Lalian Holdings Limited | Financial services | 2025 |
| Lamb Building & Civil Engineering Limited | Construction | 2023 |
| Lamcam Photography Limited | Professional & scientific | 2025 |
| Lampresa Limited | Real estate | 2023 |
| Lana Food Ltd | Wholesale & retail | 2023 |
| Land Release Ltd | Financial services | 2025 |
| Landbridge Consulting Limited | Professional & scientific | 2014 |
| Landevin Limited | Other services | 2025 |
| Landtask UK LLP | | 2007 |
| Langwith Property Limited | Real estate | 2003 |
| Lannys Plant & Tool Hire Limited | Wholesale & retail | 2011 |
| LAP Civils Ltd | Construction | 2024 |
| Laqa MED Limited | Health & social care | 2025 |
| Larch Joinery and Property Development Ltd | Construction | 2020 |
| Lario Developments Limited | Real estate | 2022 |
| Laser Cutting Advisory Services Ltd | Manufacturing | 2025 |
| Lash Education Limited | Wholesale & retail | 2020 |
| Laslau Logistics Ltd | Transport & logistics | 2023 |
| Last Orders Collective Limited | Hospitality | 2025 |
| Later Living Home Care Limited | Health & social care | 2011 |
| Laurlogistic Ltd | Transport & logistics | 2026 |
| Lavant Investments Limited | Construction | 2013 |
| Law Property Management Ltd | Real estate | 2022 |
| Law Research Ltd | Information & communication | 2024 |
| Lawson Carswell Holdings Limited | Financial services | 2020 |