| Kams Pizzas Thorne Ltd | Hospitality | 2025 |
| Kamtrans Ltd | Transport & logistics | 2024 |
| Kamyk Drive Limited | Transport & logistics | 2025 |
| KAN VEH Ltd | Wholesale & retail | 2019 |
| Kana CG Ltd | Wholesale & retail | 2026 |
| Kanarya Restaurant Ltd | Hospitality | 2023 |
| Kanejitech Technology Limited | Extraterritorial | 2026 |
| Kanesh Convenience Store Ltd | Wholesale & retail | 2025 |
| Kangshuo Biotech Co., Limited | Professional & scientific | 2010 |
| Kannan Ganesan Services Ltd | Information & communication | 2019 |
| Kantaris Investments Limited | Real estate | 2017 |
| Kanzlei DR. Cordes & Weber | Professional & scientific | 2026 |
| KAP Real Estate Limited | Real estate | 2020 |
| Kaplang Ltd | Wholesale & retail | 2022 |
| Kapnos Holding Ltd | Construction | 2024 |
| Karacter Krafts Limited | Wholesale & retail | 2008 |
| Karadaglar Investment Ltd | Real estate | 2023 |
| Karademir Ltd | Manufacturing | 2026 |
| Karadeniz Limited | Extraterritorial | 2019 |
| Karamehmet Estate Limited | Real estate | 2025 |
| Karben (Builders) Limited | | 1975 |
| Kardasz Investments Ltd | Real estate | 2023 |
| Kardelen Grill Ltd | Hospitality | 2023 |
| Karen FOY Associates Ltd | Professional & scientific | 2012 |
| Karina Transport Ltd | Transport & logistics | 2023 |
| Karlwelds Ltd | Manufacturing | 2023 |
| Karmos Rental Limited | Real estate | 2025 |
| Karobe Transport Ltd | Transport & logistics | 2015 |
| Karolsinx Transport Ltd | Transport & logistics | 2024 |
| Karpaty Bakery Beeston Limited | Wholesale & retail | 2018 |
| Karpaty Bakery Bradford Limited | Wholesale & retail | 2017 |
| Karpaty Bakery Doncaster Limited | Wholesale & retail | 2018 |
| Karpaty Bakery Harehills Limited | Wholesale & retail | 2017 |
| Karpaty Bakery Hull Limited | Wholesale & retail | 2019 |
| Karpaty Bakery Wakefield Limited | Wholesale & retail | 2018 |
| Karpaty Food Centre Limited | Manufacturing | 2016 |
| Karpaty Hull Limited | Wholesale & retail | 2024 |
| Karrik Services Ltd | Construction | 2010 |
| KAS Management Services Limited | Professional & scientific | 2015 |
| Kasalina Healthcare Limited | Health & social care | 2025 |
| Kaser Decoration Limited | Construction | 2024 |
| Kashmech Global-Investments Ltd | Manufacturing | 2011 |
| Kaslbuild Ltd | Construction | 2021 |
| Kaslrigging Services Ltd | Information & communication | 2018 |
| Kassgas Limited | Construction | 2019 |
| Kast Engineering Limited | Manufacturing | 2018 |
| KAT Communications Ltd | Information & communication | 2014 |
| Kata Chic Boutique Ltd | Wholesale & retail | 2025 |
| Katana Industries Ltd | Financial services | 2023 |
| Katefleet Ltd | Transport & logistics | 2025 |
| Katelli Properties (Holdings) Limited | Financial services | 2025 |
| Katelli Properties Limited | Real estate | 2025 |
| Katie M Fitness Limited | Other services | 2018 |
| Katie's Flower's & Gifts Limited | Wholesale & retail | 2018 |
| Katigo Ltd | Transport & logistics | 2019 |
| Katy Bullock Ltd | Arts & recreation | 2016 |
| Katy Greenwood Limited | Information & communication | 2013 |
| KAV Motor Cleaners Ltd | Administrative & support | 2022 |
| Kawa Property Ltd | Real estate | 2021 |
| KAY & Dans Daycare - Crow Tree Ltd | Health & social care | 2025 |
| Kayan Al-Habib Ltd | Wholesale & retail | 2025 |
| Kayben Damp and Building Limited | Construction | 2020 |
| Kaynas Deli Ltd | Hospitality | 2023 |
| Kayser (UK) Limited | Manufacturing | 2002 |
| Kayser Commercial Limited | Real estate | 2021 |
| Kaywest Limited | Hospitality | 2023 |
| Kayx LUX Furnishing Ltd | Wholesale & retail | 2025 |
| Kazenove Consulting Limited | Information & communication | 2013 |
| Kazer Ltd | Administrative & support | 2023 |
| KB AOX Ltd | Health & social care | 2026 |
| KB Global Consultancy Ltd | Administrative & support | 2018 |
| KB Master Ltd | Professional & scientific | 2025 |
| KB Mechanical Ltd | Construction | 2020 |
| KB MED Limited | Health & social care | 2025 |
| KB Rent Ltd | Real estate | 2026 |
| KB4CARE Limited | Health & social care | 2021 |
| KBA Engineering Ltd | Administrative & support | 2023 |
| Kbjj Limited | Wholesale & retail | 2018 |
| KBL Engineering Limited | Manufacturing | 2012 |
| Kbookeeping Ltd | Professional & scientific | 2024 |
| KC Academy of Dance Ltd | Arts & recreation | 2018 |
| KC Detailing Supplies Ltd | Wholesale & retail | 2026 |
| KC Electrical & Securities Ltd | Professional & scientific | 2022 |
| KC Home and Landscaping Ltd | Households | 2024 |
| KCB Pharma Limited | Health & social care | 2019 |
| Kcbh Investments Limited | Financial services | 2026 |
| Kcfl Motorsport Merchandise Limited | Wholesale & retail | 2023 |
| KCH Building Limited | Construction | 2022 |
| KCK Catering Ltd | Hospitality | 2025 |
| KCK Events Ltd | Professional & scientific | 2025 |
| KCK Hospitality Ltd | Hospitality | 2025 |
| KCR Properties Ltd | Real estate | 2023 |
| Kcrtm Ltd | Construction | 2018 |
| KCS Property Investments Ltd | Construction | 2005 |
| KCZ Property Holdings Limited | Real estate | 2025 |
| KCZ Property Limited | Financial services | 2025 |
| KD Residential Limited | Real estate | 2025 |
| KD UK Direct Ltd | Extraterritorial | 2024 |
| KD Windows Limited | Construction | 2013 |
| KDR Distribution Limited | Construction | 2015 |