| Karrob Ltd | Real estate | 2012 |
| Kashyyyk Limited | Financial services | 2020 |
| Katai Global Ltd | Wholesale & retail | 2017 |
| Kates Klinic Ltd | Other services | 2025 |
| Kati Ltd | Hospitality | 2025 |
| Kayes Heating Services Ltd | Construction | 2026 |
| KB93 Transport Ltd | Transport & logistics | 2024 |
| KBB Growth Ltd | Construction | 2024 |
| KBS Ventures Limited | Professional & scientific | 2023 |
| KC Bodywork Limited | Wholesale & retail | 2022 |
| KCL Bars Ltd | Hospitality | 2022 |
| KDC LDN Limited | Real estate | 2024 |
| KDF Energy Ltd | Professional & scientific | 2023 |
| KDR NW Ltd | Hospitality | 2025 |
| Ke-Design Holdings Limited | Real estate | 2021 |
| Ke-Design Studios Limited | Professional & scientific | 2016 |
| KEA Ltd | Other services | 2022 |
| Keep IT Entertained Ltd | Administrative & support | 2024 |
| Keepers Retreat Group Limited | Hospitality | 2024 |
| Kegs on Wheels Ltd | Hospitality | 2020 |
| Keiron FOX Brickwork Limited | Construction | 2019 |
| Kejayaan Ltd. | Wholesale & retail | 2016 |
| Kelly & Phoenix Property Limited | Extraterritorial | 2024 |
| Kelly Projects Limited | Construction | 2022 |
| Kelsot Ltd | Transport & logistics | 2025 |
| Kencourt Limited | Wholesale & retail | 2009 |
| Kenny CYF Group Limited | Financial services | 2026 |
| Kent Commerce Ltd | Wholesale & retail | 2022 |
| Kent Supplies (Wrexham) Limited | Wholesale & retail | 1968 |
| Kerala House (WRX) Ltd | Hospitality | 2021 |
| Kermode Properties Limited | Households | 2020 |
| Kese Best Kebab Ltd | Hospitality | 2025 |
| Kestrel Carpentry and Joinery Ltd | Manufacturing | 2018 |
| KEV Nightingale Jones Ltd | Information & communication | 2014 |
| Kevin Ingleby Engineering Services Limited | Professional & scientific | 2012 |
| Kevin Searle Ltd | Construction | 2023 |
| Key GAS Wales Limited | Other services | 2009 |
| Keyboo Limited | Construction | 2012 |
| KFS Building Maintenance Services Ltd | Administrative & support | 2024 |
| KG Wellbeing Limited | Other services | 2026 |
| KGC Distribution Limited | Wholesale & retail | 2025 |
| KHH Delph Lane Ltd | Construction | 2024 |
| KHH Moore Village Ltd | Construction | 2024 |
| Khuhinoor Wrexham Ltd | Hospitality | 2025 |
| Kiara Food and Wine Ltd | Wholesale & retail | 2026 |
| KICKSTART2BUSINESS Ltd | Professional & scientific | 2014 |
| Kidora Ltd | Other services | 2025 |
| Kiings Barber Gresford Ltd | Other services | 2025 |
| Kimisha Lewis Ltd | Arts & recreation | 2022 |
| Kinch & Co Accountants Limited | Extraterritorial | 2024 |
| Kinch Accountants Limited | Extraterritorial | 2024 |
| Kinect Luxury Travel Limited | Administrative & support | 2025 |
| King's Mill Community Trust | Arts & recreation | 2023 |
| Kingsmarsh Bars Limited | Wholesale & retail | 2009 |
| Kingsway Portfolio Management Limited | Financial services | 2010 |
| Kinnerton Hall Management Company Ltd | Households | 2014 |
| KIP App Ltd | Information & communication | 2022 |
| Kissing Whispers Limited | Professional & scientific | 2021 |
| Kjackson N&H Services Ltd | Health & social care | 2024 |
| KJJ Aero Mech Ltd | Manufacturing | 2024 |
| KLC Holdings Limited | Real estate | 2018 |
| KMP Construction & Maintenance Ltd | Construction | 2016 |
| Knight Hill Holdings Ltd | Financial services | 2024 |
| Knight Hill Homes Ltd | Construction | 2024 |
| Knight OWL Security Group Ltd | Administrative & support | 2025 |
| Knights Construction (Residential) Limited | Construction | 2018 |
| Knights Construction Group Limited | Financial services | 2015 |
| Knights Construction Ltd | Construction | 2009 |
| Knolton Farmhouse Cheese Limited | Manufacturing | 1963 |
| Knolton Holdings Limited | Professional & scientific | 2011 |
| Knolton Specialised Products Limited | Professional & scientific | 1994 |
| Komplete Performance Ltd | Arts & recreation | 2020 |
| Koptre Construction Ltd | Construction | 2020 |
| KP Electrical Solutions Ltd | Construction | 2019 |
| KPM Beauty Ltd | Other services | 2025 |
| KPP 2019 Limited | Health & social care | 2019 |
| Kristina Cafe Ltd | Hospitality | 2021 |
| Kronoplus Limited | Manufacturing | 1997 |
| Kronospan Limited | Manufacturing | 1970 |
| KRY Holdings Ltd | Financial services | 2023 |
| Krystiantransport Ltd | Administrative & support | 2022 |
| KSR Properties Ltd | Real estate | 2019 |
| KTV Driver Ltd | Transport & logistics | 2018 |
| Kustom Wizards Ltd | Administrative & support | 2020 |
| KW Corporation Ltd | Wholesale & retail | 2022 |
| KW Electrical Ltd | Construction | 2019 |
| KYM Consulting Limited | Administrative & support | 2016 |
| Kynaston Properties Limited | Real estate | 2013 |
| Kynex Engineering Limited | Professional & scientific | 2024 |
| L & D Brothers Limited | Wholesale & retail | 2015 |
| L & D Plant Hire Limited | Administrative & support | 2003 |
| L & G Skincare Limited | Other services | 2015 |
| L & L Groom Limited | Hospitality | 2024 |
| L & R Consulting LLP | | 2009 |
| L and N Leisure Limited | Hospitality | 1999 |
| L E Accounting Ltd | Professional & scientific | 2020 |
| L Nuttall Roofing Limited | Construction | 2026 |
| L Peate Plastering Services Limited | Construction | 2020 |
| L&G Innovative Consulting Ltd | Information & communication | 2023 |
| L&P Electrical Engineering Ltd | Construction | 2021 |