| KG5 Consultancy Limited | Construction | 2019 |
| KGH Investments Ltd | Real estate | 2023 |
| Khao Niew Thai Café Limited | Hospitality | 2019 |
| Khao Niew Thai Ltd | Hospitality | 2018 |
| Khepri IT Ltd | Information & communication | 2017 |
| Khyber Lodge Holiday Lets Ltd | Hospitality | 2019 |
| Kia’S Kitchen Ltd | Hospitality | 2025 |
| Kickstart Marketing Limited | Information & communication | 2022 |
| Kiddy Winx Play Cafe Limited | Hospitality | 2016 |
| Kids World (Yorkshire) Limited | Education | 2018 |
| Kids@Springwood Childcare Limited | Education | 2005 |
| Kidsworld-Childcare Ltd | Education | 2016 |
| KIG Fire Protection Ltd | Construction | 2021 |
| Kiing Lion Products Ltd | Wholesale & retail | 2024 |
| Kiliana Driver Ltd | Administrative & support | 2025 |
| Killala Properties Limited | Real estate | 2022 |
| Killamarsh Management Co Limited | Real estate | 2021 |
| KIN Khao Thai Ltd | Hospitality | 2025 |
| Kind Co Marketing Ltd | Professional & scientific | 2020 |
| Kinetic Door Systems Limited | Construction | 2022 |
| Kingfisher Fabrications Ltd | Construction | 2018 |
| Kingsbridge Limited | Real estate | 2001 |
| Kingsley Financial Planning & Consultancy Limited | Financial services | 2024 |
| Kingstock Holdings Limited | Construction | 1990 |
| Kinsley Scrap and Plant Ltd | Wholesale & retail | 2025 |
| Kinsysnacks Limited | Information & communication | 2020 |
| Kirby Kitchens & Bathrooms Ltd | Construction | 2009 |
| Kirby Vehicle Sales Ltd | Wholesale & retail | 2011 |
| Kire Home LET Ltd | Real estate | 2021 |
| Kiri News Ltd | Wholesale & retail | 2021 |
| Kirk & Cranston Limited | Manufacturing | 2000 |
| Kirkstall Limited | Manufacturing | 2000 |
| Kirkstead Developments Ltd | Construction | 2020 |
| Kitchen Appliance Care Limited | Other services | 2017 |
| Kitchen Puzzle Ltd | Manufacturing | 2019 |
| Kitchens and More Ltd | Construction | 2018 |
| Kiwi Red Limited | Hospitality | 2003 |
| Kixx Barnsley Ltd | Arts & recreation | 2017 |
| KJ & Field Ltd | Real estate | 2021 |
| KJA Services (Yorkshire) Ltd | Construction | 2007 |
| KJB Electrical Services Limited | Construction | 2015 |
| Kjpeace Limited | Health & social care | 2016 |
| KK Fried Chicken Ltd | Hospitality | 2026 |
| Kkt(Uk) Ltd | Hospitality | 2025 |
| KL Therapy Ltd | Health & social care | 2024 |
| KLB Domestic Services Limited | Administrative & support | 2026 |
| KLG Solutions Ltd | Construction | 2024 |
| KLH Trading Ltd | Professional & scientific | 2020 |
| KLI Group Limited | Financial services | 2016 |
| KM Aluminium Ltd | Manufacturing | 2023 |
| KM Compressed Air Limited | Manufacturing | 2022 |
| KM Fisher and Co Ltd | Construction | 2025 |
| KMF Jointing Ltd | Construction | 2020 |
| KMF Training & Consultancy Ltd | Professional & scientific | 2015 |
| KMR Legal Services Limited | Professional & scientific | 2025 |
| KMS & C Holdings Ltd | Financial services | 2025 |
| Knapik Transport Ltd | Transport & logistics | 2013 |
| KND K9S Ltd | Other services | 2025 |
| Knightingale Developments Limited | Real estate | 2005 |
| Knightsbridge (Brighouse) Management Co Ltd | Households | 2019 |
| KNM Storage Systems Limited | Construction | 2012 |
| Knock OFF Nigels 2 Ltd | Wholesale & retail | 2026 |
| Knock OFF Nigels Limited | Wholesale & retail | 2025 |
| Kognital Limited | Information & communication | 2023 |
| KOI Kabin Limited | Wholesale & retail | 2025 |
| Kolour Designs Ltd | Wholesale & retail | 2023 |
| Komplete Glass and Glazing Ltd | Construction | 2024 |
| Koncept Electrical Limited | Construction | 2022 |
| Koncept Group Limited | Construction | 2012 |
| Koncept Manufacturing Limited | Manufacturing | 2016 |
| Konroad Logistics Ltd | Transport & logistics | 2025 |
| Kontenta Limited | Wholesale & retail | 2013 |
| Kontenta.Com Limited | Wholesale & retail | 2018 |
| Korner Kuts Limited | Other services | 2005 |
| Korr Pilates Limited | Arts & recreation | 2025 |
| Kousar Store Ltd | Wholesale & retail | 2025 |
| Kowalski Films Inc. Ltd | Information & communication | 2016 |
| Koyu Group Ltd | Financial services | 2025 |
| KPF Consultancy Services Limited | Real estate | 2019 |
| KPF Property Services Ltd | Real estate | 2025 |
| KR Legal Consultancy Limited | Professional & scientific | 2026 |
| Kris FAL Ltd | Information & communication | 2024 |
| Kristiane Sherry Ltd | Professional & scientific | 2024 |
| KRS Property Solutions Ltd | Construction | 2023 |
| KS Insight Limited | Administrative & support | 2016 |
| KS Luxe Properties Limited | Real estate | 2025 |
| KS Mobile Valeting Solutions Ltd | Administrative & support | 2024 |
| KSL Design Limited | Administrative & support | 2008 |
| KT Cardiac Diagnostic Services Limited | Health & social care | 2024 |
| KT Homes Ltd | Real estate | 2024 |
| KTG Consulting Limited | Professional & scientific | 2022 |
| Ktpc Ltd | Wholesale & retail | 2025 |
| KUB Threads Ltd | Wholesale & retail | 2025 |
| Kuduk Ltd | Transport & logistics | 2016 |
| Kungfu Barnsley Ltd. | Hospitality | 2019 |
| Kustom Sport Holdings Limited | Professional & scientific | 2017 |
| Kustom Sport Limited | Manufacturing | 2004 |
| KW Fabeng Services Limited | Professional & scientific | 2015 |
| KW Training Ltd | Education | 2021 |
| KWP Jordan Limited | Transport & logistics | 2014 |