| Keith Howson Design Ltd | Manufacturing | 2022 |
| Kennedy Properties Cleethorpes Limited | Real estate | 2016 |
| Kensington Clarke Ltd | Information & communication | 2016 |
| Kensington Green at Scartho Management Company Limited | Professional & scientific | 2019 |
| Kent International Transit Spares Ltd | Wholesale & retail | 2011 |
| Kentmere Motor Company Limited | Wholesale & retail | 2011 |
| Kenworth Management Ltd | Administrative & support | 2022 |
| Kernowtech Ltd | Transport & logistics | 2006 |
| Kershaw Creative Ltd | Information & communication | 2023 |
| Kestrel Access Ltd | Construction | 2024 |
| Ketemley Limited | Wholesale & retail | 2025 |
| KEV Gude Fish Sales Limited | Wholesale & retail | 2022 |
| Keval Leisure Ltd | Hospitality | 2018 |
| Kevin Loadman and SON Limited | Wholesale & retail | 2002 |
| Kevin Stansfield Limited | Wholesale & retail | 1993 |
| Keyfolio Limited | Information & communication | 1994 |
| Keyrent Limited | Real estate | 2001 |
| Keystone Asset Management Ltd | Real estate | 2023 |
| Kezas Developments Limited | Construction | 2014 |
| KFT Noemi Ltd | Transport & logistics | 2018 |
| KG Stores Eleven Ltd | Wholesale & retail | 2025 |
| Kg&Jc Transport Ltd | Transport & logistics | 2015 |
| KGB Tradings Ltd. | Wholesale & retail | 2017 |
| KGP Traction Ltd | Transport & logistics | 2009 |
| KH Assets Group Limited | Real estate | 2021 |
| KH Offshore Services Ltd | Administrative & support | 2023 |
| Khea Limited | Professional & scientific | 2019 |
| Kicking Clothing Ltd | Wholesale & retail | 2020 |
| Kickstarters Training Club Ltd | Education | 2019 |
| KID 67 Ltd | Hospitality | 2014 |
| Kidd 'N' Play Limited | Arts & recreation | 2015 |
| Kiddy Cloud Limited | Wholesale & retail | 2011 |
| Kids and Adult RTW Ltd | Wholesale & retail | 2026 |
| Kieron Knights Security and Medical Services Ltd | Education | 2021 |
| Killingholme Industries Limited | Transport & logistics | 1981 |
| KIM Henderson (1960) Limited | Other services | 2012 |
| KIM Wiltshire Travel Limited | Administrative & support | 2024 |
| Kimsure Tech Limited | Professional & scientific | 2017 |
| King Edwards Street Car & Classics Limited | Other services | 2019 |
| King's Complete Home Support & Cleaning Services Ltd | Administrative & support | 2026 |
| King-Dem Ltd | Construction | 2019 |
| Kingdom Records Ltd | Information & communication | 2025 |
| Kings Mews Management Company Limited | Households | 2008 |
| Kingsley BYE Ltd | Professional & scientific | 2018 |
| Kingston Build Limited | Construction | 2013 |
| Kingsway Fish Co Limited | Manufacturing | 2021 |
| Kingsway Trading Venture Ltd | Wholesale & retail | 2022 |
| Kino Airsoft Ltd | Arts & recreation | 2024 |
| Kirkellys Developments Limited | Construction | 2015 |
| Kirwin Brothers Ltd. | Wholesale & retail | 1989 |
| KIS Property Ltd | Construction | 2020 |
| Kitchens 4 YOU Limited | Construction | 2024 |
| Kixx GY Ltd | Education | 2021 |
| KJE Electrical Ltd | Construction | 2016 |
| KJV Property Holdings Ltd | Real estate | 2026 |
| Kkfr Rail Solutions Ltd | Construction | 2019 |
| Klarity Ventures Limited | Real estate | 2017 |
| KLB Groundwork’S Ltd | Construction | 2022 |
| KLB Renewable Solutions Ltd | Construction | 2026 |
| KLC Enterprises (GB) Ltd | Wholesale & retail | 2025 |
| KLH Installations Limited | Construction | 2018 |
| KLS Despatch Services Limited | Transport & logistics | 2010 |
| KLW Property Services Limited | Construction | 2003 |
| KM Inns Limited | Hospitality | 2019 |
| KMN - Management Solutions Ltd | Construction | 2021 |
| KMP Access Limited | Professional & scientific | 2024 |
| KMS HR Consultancy Ltd | Professional & scientific | 2026 |
| Knez Real Estate Limited | Real estate | 2025 |
| Knight Technical Consultancy Ltd | Administrative & support | 2016 |
| Knockoutsoft Ltd | Information & communication | 2015 |
| KOI Pond UK Ltd | Construction | 2026 |
| Komo Nail & Beauty Ltd | Other services | 2025 |
| KOP Kelly's Office Platform Ltd | Administrative & support | 2021 |
| KOR Investments Ltd | Real estate | 2018 |
| Kort Distribution Ltd | Wholesale & retail | 2024 |
| KP Auto Cosmetics Limited | Wholesale & retail | 2024 |
| KP Double Glazing Limited | Construction | 2001 |
| KP Mechanical Services Ltd | Professional & scientific | 2025 |
| KP Medical Services Limited | Health & social care | 2025 |
| KPC Inspection Services Limited | Professional & scientific | 2011 |
| KPS Plastering Ltd | Construction | 2019 |
| KPS Plumbing & Heating Ltd | Construction | 2019 |
| KPS Property Services Ltd | Construction | 2023 |
| Krikstaponis and Holdings Limited | Wholesale & retail | 2022 |
| Kristie's Place Limited | Wholesale & retail | 2023 |
| Krjhospo Ltd | Hospitality | 2024 |
| KS Vehicle Composites Limited | Other services | 2019 |
| KSJ Clubs Ltd | Hospitality | 2016 |
| KSM Grimsby Limited | Wholesale & retail | 2016 |
| Ksry Properties Ltd | Real estate | 2024 |
| KSS Grimsby Limited | Construction | 2023 |
| Ksstf Ltd | Health & social care | 2023 |
| KST Properties Ltd | Real estate | 2020 |
| KT Redden Ltd | Construction | 2015 |
| KT Transport Ltd | Transport & logistics | 2014 |
| KT Welding Ltd | Manufacturing | 2022 |
| Kuchene Deli Ltd | Hospitality | 2023 |
| Kumilos L.P. | | 2014 |
| Kumon Cleethorpes Study Centre Limited | Education | 2024 |
| Kurt Fish Sales Limited | Manufacturing | 2009 |