| Kdrk Ltd | Construction | 2025 |
| Kds-Fast Ltd | Transport & logistics | 2023 |
| KE Group 25 Ltd | Wholesale & retail | 2023 |
| KE TM Contracts Limited | Construction | 2017 |
| Keane Creative Limited | Professional & scientific | 1997 |
| Keeping Mortgages Simple Ltd | Professional & scientific | 2022 |
| Keepmoat Homes Limited | Construction | 1987 |
| Keepmoat Limited | Professional & scientific | 1986 |
| Keepmoat Property Limited | Real estate | 1970 |
| Keepmoat Site Services Limited | Administrative & support | 1984 |
| Keepup Holdings Limited | Manufacturing | 2025 |
| Keid Consulting Limited | Administrative & support | 2015 |
| Keikaku Ltd | Professional & scientific | 2004 |
| Keith Bromhead Accountants Limited | Administrative & support | 2017 |
| Keith Clough Properties Limited | Real estate | 2008 |
| Keitlin Care Limited | Health & social care | 2017 |
| Keji Crafts Ltd | Arts & recreation | 2021 |
| Kelbrooke Limited | Wholesale & retail | 2025 |
| Kelham Street Auto's Limited | Wholesale & retail | 2019 |
| Kelham Street Cars Ltd | Wholesale & retail | 2016 |
| Kelix Transport Ltd | Transport & logistics | 2025 |
| Kelk Hanby Racing Limited | Arts & recreation | 2023 |
| Kellote Properties Ltd | Construction | 2022 |
| Kelly Consultancy Ltd | Professional & scientific | 2024 |
| Kelly Content and Communications Ltd | Professional & scientific | 2026 |
| Kelly&Co Accounting Ltd | Professional & scientific | 2025 |
| Kelly's Boilers & GAS Services Ltd | Construction | 2026 |
| Kelly's Energy Efficiency Specialists Limited | Construction | 2014 |
| Kelly's Plumbing & Bathrooms Ltd | Construction | 2026 |
| Kellyhills Ltd | Construction | 2018 |
| Kelly’S KOI Limited | Agriculture & fishing | 2026 |
| Keltharion Industries Ltd | Extraterritorial | 2026 |
| Kelvik Limited | Construction | 2013 |
| Kel’S Kafe Ltd | Hospitality | 2023 |
| KEM Medical Services Ltd | Health & social care | 2021 |
| Kembles Estates Limited | Real estate | 2014 |
| Kembles Holdings Ltd | Real estate | 2016 |
| Kemjan Limited | Real estate | 2018 |
| Kemland Company Limited | Extraterritorial | 2013 |
| Kemp Construction Services Ltd | Construction | 2024 |
| Kempetorsk Domains Limited | Professional & scientific | 2011 |
| Kempinsky Holding Limited | Financial services | 2026 |
| Kemsolutions Ltd | Professional & scientific | 2012 |
| KEN Urwin Motorcycles Limited | Wholesale & retail | 2003 |
| Kenberne Appliances Limited | Wholesale & retail | 2022 |
| Kenberne Holdings Limited | Financial services | 2007 |
| Kendal Social Work Associates Limited | Administrative & support | 2014 |
| Kenichiro Limited | Other services | 2009 |
| Kennedy Design Limited | Professional & scientific | 2002 |
| Kennett Construction Services Limited | Construction | 2024 |
| Kenning Brook Management Company Limited | Real estate | 2022 |
| Kensa Cims Limited | Professional & scientific | 2017 |
| Kent Conservation & Management Limited | Administrative & support | 2000 |
| Kent Energy, Ltd. | Administrative & support | 1996 |
| Kent Enviropower Limited | Water & waste | 1994 |
| Kent of York (Property Consultants) Limited | Financial services | 1972 |
| Kenwell Life Ltd | Professional & scientific | 2023 |
| Kenyon International Emergency Services Limited | Public administration | 2014 |
| Kenzuri Limited | Health & social care | 2025 |
| Keoganproperty Ltd | Real estate | 2024 |
| Keogan’S Interiors Ltd | Construction | 2025 |
| Kerilee Investments Limited | Wholesale & retail | 2010 |
| Kerkyra Energy Limited | Construction | 2015 |
| Kernow Commercial Property (Holdings) Limited | Financial services | 2024 |
| Kernow Commercial Property Limited | Real estate | 2024 |
| Kerrigan Property Rentals Ltd | Real estate | 2025 |
| Kerrigans Property Ltd | Real estate | 2015 |
| Kerrigans Repairs Ltd | Construction | 2018 |
| Kerrupt Animation Ltd | Information & communication | 2003 |
| KES Air Technology Limited | Wholesale & retail | 2000 |
| KES Construction Ltd | Construction | 2021 |
| KES Property Ltd | Real estate | 2022 |
| Kesame TM Ltd | Construction | 2025 |
| Kestrel Field Sports Ltd | Wholesale & retail | 2023 |
| Kestrelis Engineering Ltd | Extraterritorial | 2026 |
| Keswick Care Limited | Health & social care | 2006 |
| Keswick Industries Ltd | Extraterritorial | 2026 |
| Keswick Property Holdings Ltd | Real estate | 2024 |
| Keswick View Limited | Professional & scientific | 2008 |
| Kevii Shine & Sparkle UK Limited | Administrative & support | 2025 |
| Kevin 2022 Transport Ltd | Transport & logistics | 2024 |
| Kevin One Ltd | Transport & logistics | 2025 |
| Kevin Parker TM Ltd | Public administration | 2024 |
| Kevin Phelan Consulting Ltd | Professional & scientific | 2025 |
| Kevin PM Limited | Construction | 2019 |
| Kevs TM Ltd | Other services | 2021 |
| Kexx Holding Ltd | Other services | 2008 |
| Key Abrasives Limited | Wholesale & retail | 2009 |
| Key Automotive Solutions Ltd | Manufacturing | 2011 |
| Key Compliance Limited | Financial services | 2008 |
| Key IVR (Holdings) Limited | Information & communication | 2023 |
| Key IVR Limited | Information & communication | 2008 |
| Key Kars Limited | Wholesale & retail | 1997 |
| Key Kars Workshop Limited | Wholesale & retail | 2003 |
| Key Kars Workshops Limited | Extraterritorial | 2007 |
| Key Numbers Limited | Professional & scientific | 2016 |
| Key Signs UK Ltd. | Manufacturing | 2005 |
| Key Success Ltd | Wholesale & retail | 2020 |
| Keyhole Creative Media Limited | Professional & scientific | 2016 |
| Keyhole Estates Ltd | Real estate | 2020 |