| Kellett Industries Ltd | Financial services | 2026 |
| Kellett Property Management Ltd | Real estate | 2026 |
| Kelly Tanks Limited | Water & waste | 2013 |
| Kemp & Kemp Catering Ltd | Hospitality | 2011 |
| Kendall Bluck Consulting Ltd | Information & communication | 2010 |
| Kengo Industrial Co., Limited | Extraterritorial | 2014 |
| Kenny Groceries Limited | Hospitality | 2023 |
| Kennys Sports Bar Limited | Arts & recreation | 2013 |
| Kensington Apartments (Cannock) Limited | Households | 1987 |
| Kentia Power Engineering Limited | Manufacturing | 2005 |
| Kequan Technology Co., Ltd | Wholesale & retail | 2025 |
| Keri Louise Hensher Limited | Other services | 2020 |
| Kernel Law Ltd | Professional & scientific | 2022 |
| Kerry Beswick Limited | Professional & scientific | 2013 |
| Kerry Footman Estate Agent Ltd | Real estate | 2026 |
| Kershaw & Co. Limited | Manufacturing | 1985 |
| Kestrel Retail Consultants Limited | Administrative & support | 2017 |
| Key Diesels Ltd | Professional & scientific | 2021 |
| KEY2 Computer Services Ltd | Information & communication | 2008 |
| KEY2 Property Services Ltd | Real estate | 2022 |
| Keyosk Products Limited | Wholesale & retail | 2011 |
| Keystone Transformation Ltd | Professional & scientific | 2025 |
| KFK Business Support Ltd | Administrative & support | 2026 |
| KFK Holdings Ltd | Extraterritorial | 2026 |
| KH Accounting Limited | Professional & scientific | 2025 |
| KH Promotions Limited | Arts & recreation | 1996 |
| Khans UK Grill Limited | Hospitality | 2023 |
| Kiangsany Limited | Wholesale & retail | 2025 |
| Kilz (UK) Industries Limited | Wholesale & retail | 2024 |
| Kimberley Stag Inn Ltd | Hospitality | 2026 |
| Kimtrue Limited | Extraterritorial | 2021 |
| KIND1 Counselling and Mental Wellbeing CIC | Public administration | 2025 |
| Kindeco Trading Co., Ltd | Extraterritorial | 2021 |
| Kinderton LLP | | 2006 |
| Kindroots Collective Ltd | Wholesale & retail | 2025 |
| Kinetic Bike Bearings Ltd | Wholesale & retail | 2014 |
| Kinetic Cooling Ltd | Manufacturing | 2011 |
| Kinfolk Properties Ltd | Real estate | 2025 |
| Kingston Pool Covert (North) Limited | Other services | 2019 |
| Kingstone Landscapes Limited | Construction | 2005 |
| Kingswood Construction (Midlands) Limited | Administrative & support | 2004 |
| Kinling International Trade Co., Ltd | Wholesale & retail | 2023 |
| Kinnord Consulting Limited | Professional & scientific | 2018 |
| Kinson International Freight Co., Ltd | Extraterritorial | 2021 |
| Kirkland Decorators Limited | Construction | 2002 |
| Kirkwood Consultancy Limited | Professional & scientific | 2011 |
| Kirmlewk Ltd | Professional & scientific | 2025 |
| Kissfashion International Co., Ltd. | Wholesale & retail | 2025 |
| Kitchen Care (Stafford) Limited | Construction | 2013 |
| Kitchen Room Direct UK Ltd | Wholesale & retail | 2021 |
| KJ Change Solutions Limited | Professional & scientific | 2023 |
| KJB Water and Process Engineering Ltd | Professional & scientific | 2015 |
| Klm-Prodrive Limited | Transport & logistics | 2014 |
| KM Batey Holdings Ltd | Financial services | 2021 |
| KM Media & PR Ltd | Professional & scientific | 2026 |
| KM Optometry Services Limited | Health & social care | 2024 |
| KMC Futures Ltd | Professional & scientific | 2009 |
| KMC Legal & Finance Limited | Professional & scientific | 2018 |
| KMD Events Ltd | Hospitality | 2025 |
| KMD Housing Limited | Real estate | 2026 |
| KMH Lettings Ltd | Real estate | 2026 |
| KMS Haywood Limited | Households | 2021 |
| Kndn | Financial services | 2016 |
| Knight Property Ventures Ltd | Real estate | 2025 |
| Knightley Farming Limited | Agriculture & fishing | 2015 |
| Knotsync Limited | Wholesale & retail | 2019 |
| Knox Real Estate Limited | Real estate | 2025 |
| Kode H Technology Ltd | Professional & scientific | 2013 |
| Kofuku Ltd | Transport & logistics | 2023 |
| Kolddrose Ltd | Professional & scientific | 2024 |
| Konan Trading Limited | Wholesale & retail | 2025 |
| Konichiwahgwarn Ltd | Arts & recreation | 2020 |
| KOO Hair Design Limited | Other services | 2012 |
| Kooper Leisure Ltd | Hospitality | 2022 |
| Kova Technology Ltd | Wholesale & retail | 2025 |
| Kozano Ltd | Wholesale & retail | 2024 |
| KP Chips Ltd | Hospitality | 2022 |
| KPB Medical Consultancy Ltd | Professional & scientific | 2026 |
| Kraiburg TPE UK Limited | Wholesale & retail | 2021 |
| KRC Accommodation Ltd | Extraterritorial | 2022 |
| KRE-8 Limited | Construction | 1998 |
| KRK Motors Ltd | Wholesale & retail | 2021 |
| Kromex Inks Ltd | Manufacturing | 2019 |
| Krowl Ltd | Construction | 2023 |
| Krupski - David Consultancy Ltd | Professional & scientific | 2026 |
| KS Contract Holdings Limited | Real estate | 2019 |
| KS Contract Services Limited | Administrative & support | 2016 |
| KS Estate Planning Limited | Professional & scientific | 2025 |
| KSD Optical Ltd | Health & social care | 2014 |
| KSF Tech Limited | Manufacturing | 2025 |
| KT Fitness Ltd | Health & social care | 2013 |
| Kuarec Ltd | Wholesale & retail | 2023 |
| Kuhmichel Abrasiv Limited | Wholesale & retail | 2007 |
| Kukulska Ltd | Health & social care | 2017 |
| Kunitachi Limited | Professional & scientific | 2022 |
| Kunjo Ltd | Real estate | 2020 |
| Kurups Diagnostics Limited | Health & social care | 2015 |
| Kutchenhaus Design Limited | Wholesale & retail | 2021 |
| KVR Automotive Ltd | Wholesale & retail | 2022 |
| Kyntex Trading Limited | Wholesale & retail | 2025 |