| KMM Energy Solutions Ltd | Professional & scientific | 2023 |
| KMM Estates Ltd | Professional & scientific | 2018 |
| KMM Legacy Holdings Ltd | Financial services | 2026 |
| Knightcross Securities Ltd | Real estate | 2015 |
| Knightcross SPV Ltd | Real estate | 2023 |
| Knot Gardens Management Company Limited | Households | 2023 |
| Koelington Capital Ltd | Other services | 2022 |
| Konrad Property Compliance Ltd | Professional & scientific | 2025 |
| Koovo Limited | Information & communication | 2026 |
| Kosmos Safety Consulting Limited | Professional & scientific | 2013 |
| Kouri Limited | Wholesale & retail | 2020 |
| Kozlowski R Transport Limited | Transport & logistics | 2024 |
| Kraenswel Advisory Ltd | Professional & scientific | 2025 |
| Kraken Dogwalking Ltd | Other services | 2023 |
| Krauz Ltd | Transport & logistics | 2015 |
| Krauz Properties SPV Ltd | Real estate | 2025 |
| Krew Cuts Limited | Other services | 2013 |
| Krysto Sophia Circle of Light Ltd | Health & social care | 2025 |
| KSR Accountants Limited | Professional & scientific | 2019 |
| Kudos Project Management Limited | Administrative & support | 2019 |
| KVN (Auditing) Limited | Professional & scientific | 2003 |
| KW Motors Tmis Ltd | Wholesale & retail | 2025 |
| Kyrian Medicals Limited | Health & social care | 2023 |
| L & I Maritime Limited | Professional & scientific | 2000 |
| L 'N' L Electrical Limited | Construction | 2013 |
| L a Sharpe Limited | Agriculture & fishing | 2014 |
| L Armstrong Ltd | Hospitality | 2026 |
| L B Drives Ltd | Construction | 2021 |
| L F Cobb Properties Limited | Real estate | 2014 |
| L J Break Holdings Ltd. | Real estate | 2020 |
| L. J. Anderson Facilities Limited | Water & waste | 2016 |
| L.V.Pegg Building Contractors Limited | Construction | 2017 |
| L4 Property Group Limited | Households | 2026 |
| LA Croix Musique (LCM) Ltd | Manufacturing | 2026 |
| LA LUX Esthétique Limited | Other services | 2022 |
| Laconi Electrical Limited | Extraterritorial | 2019 |
| Laconi Limited | Extraterritorial | 2016 |
| Laffey Aggregates Limited | Transport & logistics | 2025 |
| Lagan Films Ltd | Information & communication | 2014 |
| LAH Consulting Ltd | Information & communication | 2025 |
| LAH Property Management Limited | Hospitality | 2022 |
| Lain's Ltd | Construction | 2022 |
| Lakeland Construction (Special Earthworks) Limited | Construction | 2006 |
| Lakeside Catering Limited | Hospitality | 2019 |
| Lakeside Luxury Lodges Limited | Hospitality | 2022 |
| Lakeside Poultry Limited | Agriculture & fishing | 2011 |
| Lakeside Secure Storage Limited | Transport & logistics | 2022 |
| Lale's Electrical Limited | Construction | 2018 |
| Lambert Events Ltd | Professional & scientific | 2019 |
| Lamflow Limited | Professional & scientific | 2013 |
| Land Gain Ltd | Real estate | 2025 |
| Land Searchers Limited | Construction | 2023 |
| Landsideuk Limited | Wholesale & retail | 2023 |
| Landway Group Ltd | Financial services | 2024 |
| Laneham Storage Limited | Transport & logistics | 2019 |
| Lang (003) Limited | Real estate | 2010 |
| Langford Agricultural Services Ltd | Agriculture & fishing | 2019 |
| Langtoft Lakes Ltd | Transport & logistics | 2003 |
| Lanteno Limited | Households | 2025 |
| Lantieri Estates Limited | Construction | 2022 |
| Laranova Crystals Ltd | Wholesale & retail | 2026 |
| Lark Alliance Limited | Hospitality | 2017 |
| Larkhall Place Management Company Limited | Households | 2002 |
| Laser Material Ltd | Wholesale & retail | 2022 |
| Latenightvibinrecordsunited Ltd | Professional & scientific | 2025 |
| Laughing Gravy Media Ltd | Information & communication | 2012 |
| Laurenta Properties Ltd | Hospitality | 2022 |
| Lavender Grove Skin Ltd | Health & social care | 2025 |
| Laverstock Savings & Loans Ltd | Financial services | 2020 |
| Lawn Cottage Properties Limited | Real estate | 2015 |
| Lawson Day Limited | Information & communication | 2020 |
| Lawton Lodge Ltd | Other services | 2026 |
| LAX Spa Ltd | Other services | 2025 |
| Laxton Leisure Ltd | Hospitality | 2025 |
| Layfco Ltd | Wholesale & retail | 2014 |
| Laztrad Ltd | Wholesale & retail | 2023 |
| LB Accountancy Solutions Limited | Professional & scientific | 2019 |
| LB Specialist Cars Ltd | Manufacturing | 2010 |
| LBS Garages Ltd | Wholesale & retail | 2020 |
| LC Prestige Properties Limited | Real estate | 2015 |
| LC Support Services Ltd | Manufacturing | 2023 |
| LCE Group UK Ltd | Wholesale & retail | 2017 |
| Lchr Solutions Ltd | Administrative & support | 2024 |
| LCS Mechanical Holdings Limited | Real estate | 2022 |
| LCS Mechanical Limited | Construction | 2012 |
| LE Feet Consulting Limited | Wholesale & retail | 2011 |
| Le-Hair Plumbing & Heating Limited | Energy | 2023 |
| Le-Hair Property Investments Ltd | Real estate | 2023 |
| Lead Property (Newark) Ltd | Real estate | 2024 |
| LEAD4AGILITY Ltd | Professional & scientific | 2023 |
| Leaf Financial Planning Limited | Financial services | 2018 |
| Leaf Psychology Ltd | Health & social care | 2024 |
| Lealindis Limited | Professional & scientific | 2019 |
| Leanohug Ltd | Manufacturing | 2025 |
| Lease ME Happy Ltd | Administrative & support | 2025 |
| Lease Sales Lincoln Ltd | Administrative & support | 2025 |
| Leaseandro Ltd | Administrative & support | 2025 |
| LEE Barrett Limited | Administrative & support | 2025 |
| Leehane Environmental Consulting Ltd | Professional & scientific | 2018 |
| Legdon Property Services Ltd | Real estate | 2019 |