| Kings Road (Spalding) Residents' Company Limited | Households | 2005 |
| Kings Road / Edge Lane Management Limited | Households | 2005 |
| Kings Road Advocacy CIC | Professional & scientific | 2024 |
| Kings Wines Limited | Wholesale & retail | 2014 |
| Kings Yard (Guildford) Management Company Limited | Households | 2011 |
| Kingsbury Hill Management Company Ltd | Households | 2010 |
| Kingsdown Gate (Swindon) Management Company Limited | Households | 2011 |
| Kingsgate (COX Green) Management Company Limited | Households | 2005 |
| Kingsgate Advisory Ltd | Professional & scientific | 2008 |
| Kingsgate Consulting and Advisory Limited | Professional & scientific | 2023 |
| Kingsley Green Management Limited | Households | 1994 |
| Kingsley House (Bath) Management Limited | Households | 2002 |
| Kingsley Park Management Company Limited | Households | 2007 |
| Kingsley's Shipping Services Limited | Administrative & support | 2004 |
| Kingsmead Internet Investments Limited | Education | 2009 |
| Kingsreach Management Company (Reading) Limited | Real estate | 1989 |
| Kingston Business Holdings UK Ltd | Financial services | 2023 |
| Kingston Central Two (Kingston) Management Company Limited | Households | 2002 |
| Kingston Court Management Limited | Households | 1985 |
| Kingston Park (East Leake) Management Company Limited | Households | 2005 |
| Kingswinford Foods Pizza Ltd | Hospitality | 2019 |
| Kingswood (Wilmslow) Management Company Limited | Households | 1997 |
| Kingswood Advisory Ltd | Professional & scientific | 2014 |
| Kingswood Estate Agents Limited | Professional & scientific | 2003 |
| Kingswood Group Holdings Ltd | Financial services | 2019 |
| Kingswood Group Property Holdings Ltd | Financial services | 2019 |
| Kingswood Security Ltd | Administrative & support | 2010 |
| Kinky Gerlinky Bakehouse Ltd | Hospitality | 2024 |
| Kinney & Sons Ltd | Other services | 2021 |
| Kiofer Ltd | Manufacturing | 2018 |
| Kiotto Limited | Administrative & support | 2019 |
| Kipling Court Management Company Limited | Households | 1986 |
| Kipo Holdings Limited | Real estate | 2026 |
| Kipo Limited | Construction | 2007 |
| Kipo Properties Limited | Real estate | 2026 |
| Kirk's Coffee & More Limited | Wholesale & retail | 2023 |
| Kirkdale Holdings Limited | Construction | 2026 |
| Kirkly Limited | Professional & scientific | 2017 |
| Kirkpatrick Restaurants Ltd | Hospitality | 2005 |
| Kirkpatrick Whyte Limited | Professional & scientific | 2017 |
| Kirkstall Residents Association Limited | Households | 1970 |
| Kirpa Trading Co Ltd | Hospitality | 2012 |
| Kirstie's Kurtains & Soft Furnishings Limited | Manufacturing | 2024 |
| KIS Holdings Ltd | Financial services | 2026 |
| Kishan's Locum Ltd | Wholesale & retail | 2020 |
| Kishany Ltd | Hospitality | 2023 |
| Kismet Corporation Limited | Real estate | 2006 |
| Kiso Apparel Ltd | Manufacturing | 2020 |
| KIT Blake Ltd | Wholesale & retail | 2017 |
| Kitchen Direct Ltd | Manufacturing | 2019 |
| Kitchen Fitting Services Limited | Construction | 2003 |
| Kitchen Theory Ltd | Manufacturing | 2014 |
| Kites Korner UK Ltd | Arts & recreation | 2021 |
| Kitgum Ltd | Hospitality | 2020 |
| Kith Tech Ltd | Information & communication | 2019 |
| Kitts Kare Ltd | Real estate | 2019 |
| Kitty 1897 Limited | Administrative & support | 2021 |
| Kitty Cottages Limited | Real estate | 2016 |
| Kiwi Social 1 Ltd | Professional & scientific | 2022 |
| KJ Accountancy Services Limited | Professional & scientific | 2002 |
| KJC Studios Ltd | Arts & recreation | 2025 |
| KJD Care Limited | Public administration | 2018 |
| KJW Accountancy Services Limited | Professional & scientific | 2009 |
| KJW Enterprise Limited | Professional & scientific | 2025 |
| KK Commerce Ltd | Wholesale & retail | 2025 |
| KK Hospitality Limited | Hospitality | 2020 |
| KK Technologies PVT Limited | Information & communication | 2021 |
| KKB Homes Limited | Wholesale & retail | 2019 |
| KKB2 Homes Ltd | Real estate | 2022 |
| KKL Fast Foods Limited | Hospitality | 2025 |
| Kklabib Ltd | Wholesale & retail | 2022 |
| KKS Pizza & Grill Ltd | Hospitality | 2026 |
| Kktp Ltd | Administrative & support | 2024 |
| Klassichic Ltd | Wholesale & retail | 2020 |
| Klavertjevier Ltd | Wholesale & retail | 2026 |
| Klear Consultancy Limited | Administrative & support | 2016 |
| Klear Kode Solutions Ltd | Information & communication | 2014 |
| Klenyk Ltd | Construction | 2024 |
| Klick Capital Limited | Construction | 2024 |
| Klink Transfer Ltd | Administrative & support | 2015 |
| Klix-It Ltd | Wholesale & retail | 2023 |
| Klizzy Beauty World Ltd | Other services | 2015 |
| Kljra Group Ltd | Wholesale & retail | 2026 |
| KLM Construction Builders Ltd | Construction | 2023 |
| KLM Restoration Ltd | Construction | 2025 |
| Klm-Csm Ltd | Hospitality | 2019 |
| KLV Ltd | Construction | 2026 |
| KM Capital Markets Ltd | Professional & scientific | 2018 |
| KM Tyres (Croydon) Limited | Wholesale & retail | 2023 |
| KM Tyres London Ltd | Wholesale & retail | 2025 |
| KMB Clinical Ltd | Professional & scientific | 2021 |
| KMB Same Day Couriers Limited | Transport & logistics | 2024 |
| Kmens Music Limited | Manufacturing | 2023 |
| KMK Exclusive Automobiles Ltd | Wholesale & retail | 2010 |
| Kmperio Limited | Health & social care | 2008 |
| KMS Air Conditioning Services Limited | Extraterritorial | 2026 |
| KMS Tailoring Ltd | Other services | 2014 |
| KN Decorators Ltd | Construction | 2023 |
| Knapford House Limited | Wholesale & retail | 2003 |
| Knaresborough Drive Residents Management Company Limited | Households | 2014 |