| Kemp Fabrications Ltd | Manufacturing | 2024 |
| Kemp Holdings Ltd | Financial services | 2019 |
| Kempex Wholesale Limited | Wholesale & retail | 2025 |
| Kempton Estates Ltd | Real estate | 2024 |
| KEN - Crav Investments Ltd | Real estate | 1939 |
| KEN Hawley Collection Trust | Arts & recreation | 1994 |
| KEN Mitchell Developments Ltd | Construction | 2016 |
| Kenchillscope Ltd | Wholesale & retail | 2025 |
| Kendal PUB Co Limited | Administrative & support | 2026 |
| Kendal Works Limited | Real estate | 2002 |
| Kendall Haywood Ltd | Administrative & support | 2018 |
| Kendall Media Ltd | Information & communication | 2021 |
| Kendall Poole Consulting Limited | Administrative & support | 2008 |
| Kenilworth Developments Ltd | Extraterritorial | 2003 |
| Kenmc Property Limited | Real estate | 2013 |
| Kennedy Beach Architects Limited | Professional & scientific | 2023 |
| Kennedy Grinding Limited | Manufacturing | 1979 |
| Kennsington Car Hire Ltd | Administrative & support | 2025 |
| Kenny's Buy Sell Trade Limited | Wholesale & retail | 2023 |
| Kenrey Steels Ltd. | Wholesale & retail | 1990 |
| Kensho Vitality Limited | Wholesale & retail | 2017 |
| Kensington Building Contractors Limited | Construction | 2002 |
| Kensington Law Limited | Professional & scientific | 2012 |
| Kent & Co.(Smith)Limited | Water & waste | 1920 |
| Kent Fruit Direct Limited | Hospitality | 2014 |
| Kent Web Designs Limited | Information & communication | 2019 |
| Kentgray Limited | Real estate | 1979 |
| Kentrix Limited | Information & communication | 2026 |
| Kenwood Chase (Sheffield) Flats Co. Limited | Households | 1973 |
| Kenwood Construction Services Ltd | Construction | 2018 |
| Kenwood Estates Ltd | Real estate | 2018 |
| Kenwood Hotel Property Limited | Hospitality | 2016 |
| Kenwood Housing Ltd | Real estate | 2025 |
| Kenwood Maintenance Limited | Real estate | 2006 |
| Kenwood Plumbing, Heating & Building Limited | Construction | 2005 |
| Kenwood Supported Living Ltd | Health & social care | 2025 |
| Kepler Infotech Ltd | Information & communication | 2024 |
| Kepler International Limited | Wholesale & retail | 2018 |
| Kerala Chilly Limited | Hospitality | 2026 |
| Kerem Cars Limited | Wholesale & retail | 2025 |
| Keremert Limited | Hospitality | 2024 |
| Keriat OIL Ltd. | Wholesale & retail | 2010 |
| Kerner Leisure Limited | | 1986 |
| Kerr Motors Ltd | Wholesale & retail | 2022 |
| Kerry Moss Financial Services Ltd | Financial services | 2020 |
| Kerry Moss Property & Lettings Ltd | Real estate | 2025 |
| Kerwin Solutions Limited | Real estate | 2010 |
| Kesbury Limited | Wholesale & retail | 1985 |
| Kesiena Ltd | Professional & scientific | 2015 |
| Kesteven Roofing Centre Limited | Extraterritorial | 2002 |
| Kestral Construction Products Limited | Wholesale & retail | 2004 |
| Kestrel Distributions Limited | Extraterritorial | 2008 |
| Kestrel Interiors Limited | Construction | 2003 |
| Kestrel Stone Products Limited | Construction | 2004 |
| Kestrelwoods Inns Ltd | Hospitality | 2015 |
| Ketch Couplings Limited | Extraterritorial | 1939 |
| KEV Garretty Limited | Construction | 2002 |
| Kevin Bacon UN Limited | Information & communication | 2013 |
| Kevin J Winter T/A Sheet Metal Components Limited | Manufacturing | 2013 |
| Kevin Roberts Services Limited | Construction | 2014 |
| Kevmath Limited | Arts & recreation | 2024 |
| Kevs Barbers Limited | Other services | 2025 |
| Kexo Ltd | Information & communication | 2026 |
| Key Chiropractic Services Limited | Health & social care | 2016 |
| Key Directions Group Limited | Hospitality | 2019 |
| Key Fund (GG) South Yorkshire Limited | Financial services | 2006 |
| Key Fund Investments Limited | Financial services | 2002 |
| Key Lynx CIC | Hospitality | 2019 |
| Key Lynx Cleaning Ltd | Administrative & support | 2025 |
| Key Plastering Services Ltd | Construction | 2022 |
| Key Protect Limited | Extraterritorial | 2013 |
| Key Quality Metals Trading Ltd | Wholesale & retail | 2013 |
| Key Stream Consultancy Limited | Information & communication | 2007 |
| Key Takeaway Ltd | Information & communication | 2024 |
| Key Taverns Limited | Hospitality | 2024 |
| KEY2DOOR Ltd | Real estate | 2024 |
| KEY2GO Estate & Letting Agents Ltd | Real estate | 2010 |
| Keycraft Group Limited | Real estate | 2025 |
| Keyform Limited | Professional & scientific | 2005 |
| Keyhole Therapy Ltd | Health & social care | 2023 |
| Keylink Limited | Wholesale & retail | 1991 |
| Keyo Management Ltd | Professional & scientific | 2025 |
| Keypad Limited | Real estate | 2020 |
| Keypoint Group Ltd | Professional & scientific | 2015 |
| Keypoint Mortgage Solutions Ltd | Financial services | 2014 |
| Keys Mobile Limited | Other services | 2002 |
| Keys PUB Group Limited | Hospitality | 2025 |
| Keys to Football (International) Ltd | Education | 2019 |
| Keyser Ranger Properties Limited | Extraterritorial | 2020 |
| Keysort Ltd | Wholesale & retail | 2020 |
| Keyspline Engineering Limited | Professional & scientific | 1990 |
| Keystall Limited | Wholesale & retail | 1975 |
| Keystone (Yorkshire) Limited | Real estate | 2011 |
| Keystone Monarch Ltd | Construction | 2024 |
| Keystone Plumbing & Heating Limited | Construction | 2025 |
| Keyz Ltd | Wholesale & retail | 2017 |
| Kezi Care Services Ltd | Health & social care | 2016 |
| KF Transport and Media Ltd | Transport & logistics | 2025 |
| KG Digger Hire and Groundwork Ltd | Agriculture & fishing | 2023 |
| KG Games Ltd | Information & communication | 2026 |