| Kibbeyskicks Ltd | Wholesale & retail | 2022 |
| Kibibi Properties Limited | Construction | 2024 |
| Kidz Corner (UK) Ltd | Wholesale & retail | 2009 |
| Kilos and Kilometres Ltd | Wholesale & retail | 2026 |
| Kingdom Excellence Academy Ltd | Education | 2022 |
| Kingdom First Enterprises Ltd | Real estate | 2024 |
| Kingswood Controls Limited | Wholesale & retail | 1984 |
| Kinzo Property Cleaning and Maintenance Ltd | Administrative & support | 2024 |
| Kirat Properties Ltd | Real estate | 2024 |
| KIT & R Joinery Ltd | Construction | 2025 |
| Kitchens & Joinery Solutions Ltd | Construction | 2024 |
| Kiwi Productions and Events Ltd | Professional & scientific | 2025 |
| KJA Homes Limited | Real estate | 2025 |
| Kjcqa Limited | Professional & scientific | 2024 |
| KJD College London Ltd | Education | 2025 |
| KJN Consultants Ltd | Administrative & support | 2019 |
| Kjyc & Co Limited | Professional & scientific | 2017 |
| KKK Fire Protection Ltd | Construction | 2022 |
| Kleen Machine Drycleaners Limited | Wholesale & retail | 2005 |
| KMS Mech Ltd | Construction | 2020 |
| Knight's Hill Developments Limited | Real estate | 2004 |
| Knight's Hill Investments Limited | Real estate | 2008 |
| KNR Group - Holdings Ltd | Financial services | 2024 |
| KNR Group - Waste Management Ltd | Water & waste | 2024 |
| KNR Property Developments Ltd | Construction | 2023 |
| Kntherapy Limited | Other services | 2019 |
| Kobis Engineering UK Ltd | Construction | 2024 |
| Kocager & Sons Ltd | Extraterritorial | 2024 |
| Kokura Limited | Education | 2014 |
| Koncept Property Limited | Real estate | 2019 |
| Koncepta Ltd. | Wholesale & retail | 2002 |
| Konstruct-Rite Limited | Real estate | 2015 |
| Kore IT Technology Services Ltd | Information & communication | 2013 |
| Kowrie Projects Limited | Real estate | 2020 |
| KR Lettings & Maintenance Ltd | Real estate | 2024 |
| KR Travels Limited | Administrative & support | 2022 |
| Kream Ltd | Wholesale & retail | 2016 |
| Krisdeco Limited | Construction | 2018 |
| Kronos Workforce Solutions Limited | Administrative & support | 2026 |
| Kroz Ltd | Wholesale & retail | 2015 |
| Krypton Engineering Ltd | Wholesale & retail | 2019 |
| KS Personal Property Consultancy Limited | Real estate | 2020 |
| KS Pipeworx Limited | Construction | 2023 |
| Ktaluca Land Ltd | Transport & logistics | 2017 |
| KTM Motors Limited | Wholesale & retail | 2020 |
| Kucuk Baran Ltd | Hospitality | 2023 |
| Kula Scaffold Limited | Construction | 2025 |
| Kulclothing Ltd | Wholesale & retail | 2021 |
| Kvng Limited | Wholesale & retail | 2021 |
| Kwachie Corp Ltd | Professional & scientific | 2016 |
| KWF Aggregates Limited | Transport & logistics | 2015 |
| Kwpao Limited | Information & communication | 2001 |
| Kyman Motors Ltd | Wholesale & retail | 2022 |
| Kyoto House Ltd | Real estate | 2020 |
| KZ Klothes Club Ltd | Wholesale & retail | 2025 |
| L & B Luxe Hosting Ltd | Hospitality | 2024 |
| L & Z Property Services Limited | Real estate | 2025 |
| L and M Support Services Limited | Administrative & support | 2012 |
| L C Management Co Limited | Real estate | 2017 |
| L J Environmental | | 1996 |
| L S (Windows and Doors) Fabrications Limited | Extraterritorial | 2018 |
| L&D Projects Ltd | Professional & scientific | 2021 |
| L&L Concept Ltd | Construction | 2017 |
| L&M (PVT) Limited | Wholesale & retail | 2025 |
| L&S Building Design Ltd | Construction | 2025 |
| L'Art Deco Ltd | Construction | 2025 |
| L.A.W Building Contractors Ltd | Construction | 2022 |
| L.H. Electrical & Planning Services Ltd | Administrative & support | 2008 |
| L20 Doorsets Limited | Manufacturing | 2016 |
| LA Beaute Salon Ltd | Other services | 2018 |
| LA Point Limited | Other services | 2019 |
| LA VE Solangé Limited | Other services | 2025 |
| Lady Click Services Limited | Administrative & support | 2011 |
| Lady Rich (Online) Ltd | Manufacturing | 2011 |
| Lagmar Group Ltd | Construction | 2019 |
| Lala JI Construction Ltd | Construction | 2015 |
| Lambano Services Limited | Health & social care | 2014 |
| Lana Express Ltd | Transport & logistics | 2020 |
| Landmark Hotels Ltd | Real estate | 2016 |
| Langsicht Limited | Professional & scientific | 2025 |
| Larrys Group Ltd | Health & social care | 2022 |
| Larydot Recruitment UK Limited | Hospitality | 2019 |
| Lauris Haulage Ltd | Transport & logistics | 2018 |
| Lavish Aesthetics by Gabrielle Ltd | Other services | 2023 |
| Lawson & Jones Properties Limited | Real estate | 2023 |
| Lazap Electrical Ltd | Construction | 2024 |
| LCS (Skip Repair, Self Store & Sales) Limited | Manufacturing | 2007 |
| LCS Engines Ltd | Wholesale & retail | 2023 |
| LDQ Property Limited | Real estate | 2024 |
| LE Balti Ltd | Hospitality | 2026 |
| LE Bay Ltd | Hospitality | 2024 |
| LE Sneddon Ltd | Professional & scientific | 2020 |
| Leap Learners Ltd | Education | 2025 |
| Learn More Academy Limited | Education | 2019 |
| Learning Minds Centre Limited | Education | 2018 |
| Learnwise Tuition Ltd | Education | 2023 |
| Ledgerfox Limited | Financial services | 2026 |
| Leenthi Services Ltd | Construction | 2026 |
| Leftfield Studio Ltd | Professional & scientific | 2013 |
| Legacy Accountancy Solutions Limited | Professional & scientific | 2024 |