| Kings Butchers (Exmouth) Ltd | Wholesale & retail | 2020 |
| Kingscliff Contracting Ltd | Agriculture & fishing | 2015 |
| Kingsdale Freehold Limited | Extraterritorial | 2014 |
| Kingsford Holiday Lodges Ltd | Hospitality | 2022 |
| Kingsford Park Estates Limited | Arts & recreation | 2025 |
| Kingsgate Management Company Limited | Real estate | 1995 |
| Kingsland (Westward HO!) Management Company Limited | Households | 2021 |
| Kingsmead Consultancy Limited | Information & communication | 2008 |
| Kingstone House & Woolstone House Management Company Limited | Households | 2025 |
| Kinnerton Court Residents Association Limited | Households | 1985 |
| Kinnerton Vale Residents Association Limited | Households | 1987 |
| Kinsella Ltd | Construction | 2024 |
| Kintail Care Ltd | Health & social care | 2021 |
| KIP Mcgrath Education UK Limited | Education | 2007 |
| Kipeople Consulting Limited | Professional & scientific | 2012 |
| Kippax Performance UK Limited | Wholesale & retail | 2012 |
| Kirkgate Lane Solar Farm Limited | Energy | 2021 |
| Kirkham Board Associates Limited | Construction | 2005 |
| Kirkland Ventures Ltd | Real estate | 2015 |
| Kirks Insolvency LLP | | 2025 |
| Kitchen KIT (Exeter) Ltd | Wholesale & retail | 2019 |
| Kitchener Land and Planning Limited | Professional & scientific | 2014 |
| Kitchenworld (South West) Ltd | Construction | 2025 |
| Kitt Sport Ltd | Manufacturing | 2025 |
| Kittigirl Kawaii Ltd | Wholesale & retail | 2024 |
| Kittiwake Property Ltd | Hospitality | 2024 |
| Kivell & Sons (Auctioneers) | Wholesale & retail | 1977 |
| Kivells Limited | Wholesale & retail | 2013 |
| Kivells Trustees Limited | Professional & scientific | 2026 |
| KJ Paving and Civil Solutions Limited | Construction | 2026 |
| KJB (SW) Ltd | Construction | 2020 |
| KJH Educational Therapy Ltd | Education | 2021 |
| KJW Installations Ltd | Construction | 2021 |
| KK & MK Ltd | Hospitality | 2020 |
| Kkca Holdings Limited | Financial services | 2025 |
| Kkintegratedsolutions Ltd | Manufacturing | 2020 |
| KKO Holdings Limited | Financial services | 2021 |
| Klarian Limited | Information & communication | 2015 |
| KLC YY Limited | Hospitality | 2025 |
| Klein and Woodward Limited | Professional & scientific | 2026 |
| KLH Travel Ltd | Administrative & support | 2016 |
| Klima Solutions Ltd | Construction | 2013 |
| Klimaki Limited | Wholesale & retail | 2021 |
| KLM Transport Services Ltd | Transport & logistics | 2023 |
| Klonex Medical Ltd | Wholesale & retail | 2014 |
| Klotski Translations Ltd. | Professional & scientific | 2020 |
| Klowey Investments Limited | Real estate | 2019 |
| Klowey Properties Limited | Real estate | 2016 |
| Klyra Labs Ltd | Information & communication | 2026 |
| KM Innovations Limited | Hospitality | 2012 |
| KM Lathuabi Retail Ltd | Wholesale & retail | 2026 |
| KMC Properties Real Estate Ltd | Real estate | 2016 |
| KMC Property Management (Purley) Limited | Real estate | 2022 |
| KMS Mortgage Solutions Limited | Financial services | 2026 |
| Kmsr Ltd | Real estate | 2021 |
| Knight and Day Cleaning Limited | Administrative & support | 2014 |
| Knights & Hyde Limited | Wholesale & retail | 2017 |
| Knightsbridge Property Holdings Limited | Construction | 2015 |
| Knightswood Mansion Management Limited | Real estate | 2024 |
| Knockerlocker Limited | Wholesale & retail | 2021 |
| Knowles DE Oliveira Ltd | Real estate | 2025 |
| Knowles Limited | Professional & scientific | 2000 |
| Knox HR Limited | Professional & scientific | 2012 |
| Koch House Ltd | Real estate | 2022 |
| Kode Cove Ltd | Information & communication | 2018 |
| Koeller Property Investments Limited | Real estate | 2024 |
| Kondanani UK | Health & social care | 2005 |
| Konker Ltd | Administrative & support | 2018 |
| Kookaburra Technologies Limited | Information & communication | 2019 |
| Koprowski Logistics Ltd | Transport & logistics | 2022 |
| KOR Communications Limited | Professional & scientific | 2006 |
| Koroutine Ltd | Information & communication | 2017 |
| Kosh Exeter Ltd | Real estate | 2017 |
| Kospet Ltd | Health & social care | 2023 |
| Kospetbtl Limited | Real estate | 2025 |
| Kotai Research Ltd | Professional & scientific | 2025 |
| Kovan Valeting Limited | Wholesale & retail | 2025 |
| KP Marina Living Limited | Construction | 2023 |
| KP Rentals Limited | Real estate | 2025 |
| KPG Ventures Ltd | Financial services | 2025 |
| KPR Services Limited | Construction | 2007 |
| Kraken Vanz Ltd | Wholesale & retail | 2021 |
| KRD Computing Limited | Information & communication | 2012 |
| Kreston Bishop Fleming Limited | Extraterritorial | 2010 |
| Kreston UK Limited | Professional & scientific | 2004 |
| Kropka Ltd | Information & communication | 2015 |
| KRV Property Ltd | Administrative & support | 2023 |
| Krystal Eden Ltd | Hospitality | 2019 |
| Krystaliya Jewellers Ltd | Manufacturing | 2025 |
| KS Commercial Property Limited | Real estate | 2014 |
| KS Fitness Ltd | Arts & recreation | 2015 |
| KS Flooring Ltd | Construction | 2026 |
| Ksfg Limited | Manufacturing | 2009 |
| Kssc (SW) Limited | Hospitality | 2025 |
| KT Prints Ltd | Wholesale & retail | 2024 |
| Kudu Enterprises Limited | Real estate | 2024 |
| Kumiko (SW) Ltd | Manufacturing | 2022 |
| Kurb Carbon Ltd | Information & communication | 2022 |
| Kuromnis Ltd | Extraterritorial | 2023 |
| Kutch Holdings Limited | Financial services | 2023 |