| Kache Limited | Administrative & support | 2019 |
| KAI IWI Limited | Real estate | 2025 |
| Kaiju Exotics Ltd | Other services | 2025 |
| Kals Cafe Ltd | Hospitality | 2026 |
| Kamji Ltd | Wholesale & retail | 2022 |
| Kando Candy Floss and Popcorn Machines Ltd | Manufacturing | 2004 |
| Kang KAI Ltd | Hospitality | 2023 |
| Kaper Media Ltd | Information & communication | 2024 |
| Kartal Estate Ltd | Real estate | 2025 |
| Kartal Food Ltd | Hospitality | 2024 |
| Kasper Kollects Limited | Other services | 2026 |
| Katherine Priddy Limited | Extraterritorial | 2022 |
| Katie Where to Next Limited | Administrative & support | 2025 |
| KB Direct Ltd | Wholesale & retail | 2021 |
| KB108 Ltd | Other services | 2025 |
| Kbta Limited | Hospitality | 2018 |
| KC Hagley Limited | Other services | 2025 |
| KC Legal Limited | Professional & scientific | 2024 |
| KD Waste Limited | Water & waste | 2025 |
| KDS Electrical & Properties Ltd | Construction | 2004 |
| KE1 Ltd | Wholesale & retail | 2023 |
| Keatinge Fiduciaries Limited | Construction | 2013 |
| Keatinge Management Ltd | Administrative & support | 2012 |
| Kelly's Heroes (Care) Ltd | Administrative & support | 2023 |
| Kendrick Construction Limited | Construction | 1981 |
| Kendrick Homes Limited | Construction | 1927 |
| Kerbed Insprayation Wheels Ltd | Wholesale & retail | 2024 |
| Kerf Furniture UK Limited | Wholesale & retail | 2015 |
| Kerri Clarke Limited | Other services | 2008 |
| Kerry Anns Hair and Beauty Ltd | Other services | 2017 |
| Keymas Limited | Information & communication | 1986 |
| Keymesh Limited | Wholesale & retail | 1993 |
| Keystone Design and Build Ltd | Construction | 2026 |
| KGC Limited | Construction | 1990 |
| Khaas Tech Services Ltd | Information & communication | 2023 |
| Khoury Architects Limited | Professional & scientific | 2008 |
| Khoury Architecture Ltd | Professional & scientific | 2022 |
| Khoury Associates Ltd | Financial services | 2022 |
| Khoury Land Ltd | Professional & scientific | 2022 |
| Khyber Fried Chicken Ltd | Hospitality | 2026 |
| Khyber MIX Grill & Pizza Ltd | Hospitality | 2016 |
| Kidderminster Hardware Limited | Wholesale & retail | 2019 |
| Kidderminster Logistics Ltd | Transport & logistics | 2023 |
| Kidderminster Rugs Ltd | Manufacturing | 2012 |
| Kiliagon Ltd | Professional & scientific | 2022 |
| Kimbley Properties Ltd | Real estate | 2023 |
| Kindred Seeds Limited | Health & social care | 2025 |
| Kings Cottages Limited | Hospitality | 2021 |
| Kings Fayre Bakery Limited | Manufacturing | 2004 |
| Kingsbridge Farming Services Limited | Agriculture & fishing | 2019 |
| Kingsbridge Property Management Services Limited | Construction | 2017 |
| Kingsguard Legal Trust Corporation Limited | Professional & scientific | 2021 |
| Kingsguard Storage Ltd | Other services | 2016 |
| Kingsway Corporation Limited | Manufacturing | 2009 |
| Kingswinford Bridal Limited | Wholesale & retail | 2016 |
| Kingswinford Community Services Limited | Transport & logistics | 2016 |
| Kingswood Investments Ltd | Real estate | 2019 |
| Kinoko Coffee Limited | Wholesale & retail | 2021 |
| Kinver (the Anchor) Management Limited | Households | 2009 |
| Kinver 1958 Limited | Extraterritorial | 2014 |
| Kinver Canopies Ltd | Manufacturing | 2011 |
| Kinver Country Fayres Limited | Other services | 2011 |
| Kinver Dog Parlour Limited | Other services | 2020 |
| Kinver Engineering Limited | Manufacturing | 2013 |
| Kinver Estates (Holdings) Ltd | Extraterritorial | 2021 |
| Kinver Estates Ltd | Real estate | 2021 |
| Kinver Investments (Holdings) Ltd | Extraterritorial | 2021 |
| Kinver Investments Ltd | Real estate | 2021 |
| Kinver Opticians Limited | Wholesale & retail | 2023 |
| Kinver Tandoori Limited | Hospitality | 2009 |
| Kinver Web Marketing Limited | Wholesale & retail | 2006 |
| KIP Properties Limited | Real estate | 2024 |
| Kirstie Smith Limited | Wholesale & retail | 2024 |
| Kitchen 30 Limited | Hospitality | 2023 |
| KITCHENS4DIY.COM Limited | Wholesale & retail | 2014 |
| Kite Connexion Holdings Limited | Professional & scientific | 2003 |
| Kite Connexion Limited | Professional & scientific | 2000 |
| KJS Locums Ltd | Health & social care | 2014 |
| KJS Property Investments Limited | Real estate | 2013 |
| KLC Investments Limited | Real estate | 2021 |
| KLM Dwellings Limited | Real estate | 2024 |
| KMR Property Rentals Limited | Real estate | 2018 |
| Knightsbridge Eyewear (UK) Limited | Extraterritorial | 1993 |
| Knightstone Legal Services (Stourbridge) Limited | Professional & scientific | 2019 |
| Knowle Photographics Ltd | Wholesale & retail | 2010 |
| KOI E-Sourcing Solutions Limited | Wholesale & retail | 2021 |
| Koini Ltd | Wholesale & retail | 2018 |
| Kompas Ltd | Wholesale & retail | 2020 |
| Koutas Property Ltd | Real estate | 2025 |
| Kowshik Jain Ltd | Health & social care | 2018 |
| KP Properties Investments Limited | Real estate | 2026 |
| KP Properties Management Limited | Real estate | 2003 |
| KPL (London) Management Company Limited | Real estate | 2014 |
| KR Car Care Ltd | Wholesale & retail | 2025 |
| Kraken Haulage Ltd | Transport & logistics | 2026 |
| KRS Bache Heating Limited | Construction | 2005 |
| KSC Family Limited | Hospitality | 2024 |
| Ksmg Services Limited | Health & social care | 2017 |
| KSS Joint Operations Ltd | Health & social care | 2019 |
| KTJ International Ltd | Transport & logistics | 2009 |