| Katoa Limited | Health & social care | 2005 |
| Katy Brown Limited | Wholesale & retail | 2009 |
| Katzenbar Limited | Professional & scientific | 2020 |
| Kayboat Tyres Ltd | Wholesale & retail | 2012 |
| Kaycoa Limited | Hospitality | 2021 |
| Kaye Contracting Ltd | Agriculture & fishing | 2025 |
| Kazimynd Limited | Health & social care | 2019 |
| KC Jugo Limited | Information & communication | 2020 |
| KCT Photography Limited | Professional & scientific | 2009 |
| KDF Training Limited | Administrative & support | 2014 |
| KDM Virtual Assist Ltd | Administrative & support | 2023 |
| Keadby Bridge Hand Car Wash Ltd | Wholesale & retail | 2026 |
| Keadby Developments Limited | Energy | 1992 |
| Keadby Generation Limited | Energy | 1992 |
| Kebab Grill Ltd | Hospitality | 2026 |
| Kebab Special Ltd | Hospitality | 2024 |
| Kebabies Burger Ltd | Hospitality | 2026 |
| Kebabies Pizza Ltd | Hospitality | 2025 |
| Kebabies Plus Ltd | Hospitality | 2024 |
| Kebabs and Smash Ltd | Hospitality | 2026 |
| Keerston Limited | Transport & logistics | 2015 |
| Keir Architecture Ltd | Professional & scientific | 2009 |
| Keith Vipurs Limited | Wholesale & retail | 2004 |
| Kelsey Garden Parks Limited | Real estate | 2023 |
| Kendall Consultancy Limited | Professional & scientific | 2025 |
| Kendall Joinery Contractors Ltd | Manufacturing | 2002 |
| Kene Visionary Limited | Administrative & support | 2023 |
| Kenlinks Research Services Limited Liability Partnership | | 2009 |
| Kent Heart Health Ltd | Health & social care | 2023 |
| Kentex Global Limited | Wholesale & retail | 2024 |
| Kenzie Lowe Ltd | Administrative & support | 2025 |
| Kershaw Electrical Services Ltd | Construction | 2019 |
| Kershaw Plumbing Services (Messingham) Ltd | Construction | 2023 |
| KEV Magic Barbers Ltd | Other services | 2025 |
| Kev's Vapes Ltd | Wholesale & retail | 2025 |
| Kevin Earl Signs Ltd | Manufacturing | 2016 |
| Kevintrans Limited | Wholesale & retail | 2015 |
| Keylet Properties Limited | Real estate | 2002 |
| Keystead Homes Ltd | Real estate | 2025 |
| Keystone Architecture Limited | Professional & scientific | 2016 |
| KEZ Properties Limited | Real estate | 2024 |
| Kezglobal Ltd | Wholesale & retail | 2023 |
| Khalid Khan Medical Services Limited | Health & social care | 2007 |
| KHE Civils Ltd | Construction | 2018 |
| KID Rick Ltd | Information & communication | 2022 |
| Kieradan Park Limited | Arts & recreation | 2013 |
| Kiki's Chimney Bakery Ltd | Manufacturing | 2019 |
| Kimark Limited | Professional & scientific | 2007 |
| Kimark Properties Ltd | Real estate | 2023 |
| Kimberley Performing Arts Centre Ltd. | Arts & recreation | 2011 |
| Kingsferry House Ltd | Transport & logistics | 2022 |
| Kingsferry Wharf - (RSL) Ltd | Transport & logistics | 2007 |
| Kingston Medical Associates Ltd | Health & social care | 2016 |
| Kingsway Ground Maintenance Ltd | Construction | 2023 |
| Kirikee Limited | Hospitality | 2018 |
| Kirkcraig Consulting Limited | Administrative & support | 2013 |
| Kirks Korner Ltd | Wholesale & retail | 2010 |
| Kirks Korner Motel Limited | Hospitality | 2016 |
| Kitana Holdings Limited | Professional & scientific | 2002 |
| Kitchen Range Holdings Limited | Professional & scientific | 2008 |
| Kiwi Production Ltd | Information & communication | 2025 |
| KJ Presto Ltd | Hospitality | 2024 |
| KJS Building and Maintenance Ltd | Construction | 2023 |
| KL Sales and Wholesale Ltd | Wholesale & retail | 2022 |
| KMR Property Management Limited | Construction | 2020 |
| KMW Motors Limited | Wholesale & retail | 2025 |
| Know Media Limited | Information & communication | 2013 |
| KNOWLEDGESOLUTIONS4YOU Limited | Administrative & support | 2022 |
| Koban Stop & Shop Ltd | Wholesale & retail | 2025 |
| Koenig Group Ltd | Information & communication | 2018 |
| Kongs Cards Ltd | Wholesale & retail | 2021 |
| Koston Construction & Brickwork Limited | Construction | 2022 |
| KPM Safety Consultancy Ltd | Public administration | 2026 |
| KR Medical Consultants Limited | Health & social care | 2012 |
| KR Wall Solutions Ltd | Manufacturing | 2026 |
| KR2 Golden Ltd | Other services | 2025 |
| KRB Group Limited | Financial services | 2019 |
| Krisalex Limited | Administrative & support | 2005 |
| KRJ Transport Ltd | Transport & logistics | 2018 |
| Krystian Dziura Ltd | Transport & logistics | 2024 |
| KS Fibre Solutions Ltd | Construction | 2021 |
| KS Land & Assets Limited | Real estate | 2025 |
| KS Quality Rooms Ltd | Real estate | 2024 |
| KS73 Invest Limited | Wholesale & retail | 2022 |
| KSB Coaching Ltd | Real estate | 2018 |
| KSJ Hospitality Ltd | Hospitality | 2026 |
| KSK Automotive Limited | Wholesale & retail | 2025 |
| KSN Comercial Leasing Ltd | Financial services | 2022 |
| KSN Homes Ltd | Real estate | 2025 |
| Kst-Ex Consultants Limited | Construction | 2018 |
| Ktrm Logistics Ltd | Transport & logistics | 2025 |
| Kubit-Trans Ltd | Transport & logistics | 2017 |
| Kubus Fresh Bakry Limited | Wholesale & retail | 2023 |
| Kubus XL Supermarket Limited | Wholesale & retail | 2024 |
| Kuki Trading Limited | Wholesale & retail | 2019 |
| Kumar Anaesthesia Limited | Health & social care | 2017 |
| Kunle Adedara & Co Legal Consultancy Ltd | Professional & scientific | 2026 |
| Kurdistan Breakfast Ltd | Hospitality | 2024 |
| Kuyumcu Properties Ltd | Real estate | 2022 |
| Kuzmycius Limited | Transport & logistics | 2025 |