| KRB Hospitality Limited | Hospitality | 2018 |
| KRD Ceilings Limited | Construction | 2015 |
| Kreon Technologies Ltd | Information & communication | 2026 |
| KRH Transport Ltd | Construction | 2024 |
| KRI Services (UK) Limited | Real estate | 2015 |
| Kris Maher Music Consultancy Ltd | Professional & scientific | 2023 |
| Kris Recovery Ltd | Transport & logistics | 2024 |
| Krisbarr Ltd | Transport & logistics | 2022 |
| Krishna Foods Limited | Hospitality | 2012 |
| KRJ Limited | Health & social care | 2022 |
| KRN Trans Ltd | Transport & logistics | 2025 |
| Kroda Ltd | Transport & logistics | 2026 |
| Kroger Digital Ltd | Professional & scientific | 2026 |
| Krone Holding Limited | Financial services | 2024 |
| Kronstadt Russia Ltd | Extraterritorial | 2022 |
| Krtn Trading Ltd | Wholesale & retail | 2023 |
| Kruza Autos Ltd | Wholesale & retail | 2024 |
| Kruzhend Ltd | Wholesale & retail | 2024 |
| Krzysztof Logistics Ltd | Transport & logistics | 2017 |
| KS Auto Services Ltd | Administrative & support | 2016 |
| KS Creative Works Ltd | Professional & scientific | 2025 |
| KS Groundworks South Yorkshire Limited | Construction | 2023 |
| KS Mills Electrical Contractor Limited | Construction | 2015 |
| KSA DRIVE27 Limited | Transport & logistics | 2019 |
| KSK Living Ltd | Real estate | 2025 |
| KSM Media Ltd | Arts & recreation | 2023 |
| KSR Autos Ltd | Wholesale & retail | 2020 |
| KSS Retail Solutions Ltd | Other services | 2019 |
| Kssbr Solutions Limited | Real estate | 2018 |
| KSW Domin Ltd | Wholesale & retail | 2026 |
| KT Lettings Limited | Real estate | 2016 |
| KT Seal Ltd | Construction | 2025 |
| KT Trading Private Ltd | Wholesale & retail | 2016 |
| KT Traffic Ltd | Construction | 2023 |
| KTH Holding Ltd | Financial services | 2024 |
| KTM Professional Services Ltd | Information & communication | 2019 |
| Ktss Ltd | Administrative & support | 2021 |
| Kuanjaxaio Limited | Wholesale & retail | 2025 |
| Kubus' NO 1 Limited | Wholesale & retail | 2023 |
| Kudos Developments Ltd | Construction | 2019 |
| Kundra Computers Limited | Wholesale & retail | 2007 |
| Kunity Ltd | Information & communication | 2026 |
| Kurdish Barber Askern Ltd | Other services | 2024 |
| Kurdish Meat Halal Limited | Wholesale & retail | 2024 |
| Kurdistan 4 Restaurant Limited | Hospitality | 2025 |
| Kurteg Investment Ltd | Real estate | 2023 |
| Kurthso Holding Ltd | Financial services | 2023 |
| Kustom Design Printing Limited | Manufacturing | 2013 |
| Kuvaka Healthcare Ltd | Health & social care | 2025 |
| Kuwboo Limited | Extraterritorial | 2010 |
| Kuzey Burger Ltd | Hospitality | 2024 |
| Kvcsm Ltd | Transport & logistics | 2026 |
| KVF TM Ltd | Public administration | 2024 |
| Kviatkov Trans Ltd | Transport & logistics | 2021 |
| KW Blinds Limited | Construction | 2016 |
| KW Bookkeeping Limited | Professional & scientific | 2022 |
| KW Pizza Limited | Hospitality | 2025 |
| KW-DN9 Ltd | Real estate | 2024 |
| Kwikkitchen Ltd | Hospitality | 2025 |
| KYG Pizza Limited | Hospitality | 2026 |
| Kyle Walker Limited | Professional & scientific | 2011 |
| Kylo Services Ltd | Real estate | 2016 |
| KYM Ltd | Construction | 2019 |
| Kynaston Commercials Ltd | Wholesale & retail | 2025 |
| Kyndora Ventures Ltd | Extraterritorial | 2026 |
| Kyoo Limited | Financial services | 2018 |
| Kyoo Studio Limited | Information & communication | 2018 |
| Kyragu Invest Ltd | Extraterritorial | 2024 |
| Kyran Hall TM Ltd | Public administration | 2022 |
| KZ Home One Ltd | Financial services | 2025 |
| L & J Clark Limited | Administrative & support | 2013 |
| L & J Window Installations Limited | Construction | 2005 |
| L & M Creations Ltd | Manufacturing | 2021 |
| L & P Hutchinson Holdings Limited | Real estate | 2018 |
| L a Leeds Limited | Professional & scientific | 2023 |
| L B Roofing Ltd | Construction | 2022 |
| L B Structures (South West) Limited | Professional & scientific | 2012 |
| L Clark Engineering Solutions Ltd | Manufacturing | 2025 |
| L Cowburn Electrical Ltd | Manufacturing | 2015 |
| L Green & Co Ltd | Extraterritorial | 2017 |
| L H and SON Property Ltd | Real estate | 2024 |
| L Holden UK Ltd | Professional & scientific | 2025 |
| L Hook Investments Ltd | Real estate | 2025 |
| L J Brealey TM Ltd | Public administration | 2025 |
| L J S Transport of Settle Limited | Transport & logistics | 2009 |
| L Jackson & Co Group Ltd | Financial services | 2025 |
| L Jackson & Co Holdings Ltd | Other services | 2023 |
| L Jackson & Co Limited | Wholesale & retail | 2011 |
| L K Mini Store Ltd | Wholesale & retail | 2026 |
| L M Education Consultancy Limited | Other services | 2019 |
| L M J Building Services Limited | Construction | 2013 |
| L M N Contracts Limited | Construction | 2009 |
| L Oldfield Investments Limited | Professional & scientific | 2025 |
| L V B Enterprise Limited | Wholesale & retail | 2013 |
| L V B Overland Limited | Wholesale & retail | 2017 |
| L&A-Trading Group Ltd | Wholesale & retail | 2024 |
| L&Co Prime Investments Ltd | Extraterritorial | 2025 |
| L&D Waste Services Limited | Water & waste | 2025 |
| L&F Pet Services Ltd | Other services | 2025 |
| L&H Construction Services Ltd | Construction | 2021 |