| K Campbells Group Ltd | Construction | 2024 |
| K J a Partnership Limited | Extraterritorial | 2003 |
| K JOJ Goods Ltd | Wholesale & retail | 2025 |
| K Patel Holdings and Investments Ltd | Financial services | 2021 |
| K&G Logistics Ltd | Transport & logistics | 2022 |
| K&H Jain Properties Limited | Real estate | 2017 |
| K&I Speedy Delivery Ltd | Wholesale & retail | 2023 |
| K&M Holdings and Investments Ltd | Financial services | 2023 |
| K-13 Architecture Ltd | Professional & scientific | 2021 |
| K.J. Evans & Sons (Midlands) Limited | Construction | 2003 |
| K.Sss Service UK Ltd | Wholesale & retail | 2026 |
| K1EXPRESS Ltd | Wholesale & retail | 2022 |
| Kabinwall Limited | Construction | 2005 |
| Kabra Real Estates Limited | Real estate | 2026 |
| KAD Services (MID) Ltd | Professional & scientific | 2026 |
| Kafak Ltd | Health & social care | 2019 |
| Kafak Properties Ltd | Households | 2021 |
| Kagefilms Limited | Information & communication | 2020 |
| Kaif Engineering Limited | Construction | 2017 |
| Kairon Properties Limited | Real estate | 2025 |
| Kaki Sports Ltd | Wholesale & retail | 2013 |
| Kaki Stores Ltd | Wholesale & retail | 2018 |
| Kalamunda Ltd | Real estate | 2019 |
| Kalex International Limited | Wholesale & retail | 1978 |
| Kalisian Ltd | Arts & recreation | 2023 |
| Kamtomera Limited | Professional & scientific | 2022 |
| KAN Supplies Ltd | Public administration | 2020 |
| Kandi Parties and Events Ltd | Hospitality | 2025 |
| Kara Pharma Limited | Financial services | 2025 |
| Karam Sanghera Ltd | Transport & logistics | 2026 |
| Karl Czinege Consulting Ltd | Professional & scientific | 2011 |
| Karl Wiggin Carpentry Limited | Construction | 2014 |
| Karol Rupotacki Ltd | Transport & logistics | 2019 |
| Karom Limited | Real estate | 2017 |
| Karwal Services Limited | Information & communication | 2007 |
| KAS Xpress Limited | Transport & logistics | 2025 |
| Kasede Limited | Health & social care | 2019 |
| Kash Multidrop Ltd | Transport & logistics | 2024 |
| Kashan Malik Limited | Wholesale & retail | 2024 |
| Kashmir Logistics Ltd | Transport & logistics | 2024 |
| Kashmir Watan Mini Market Ltd | Wholesale & retail | 2025 |
| Kates Hill Super Store Limited | Wholesale & retail | 2015 |
| Katrus Ltd | Construction | 2025 |
| Kavee Ltd | Hospitality | 2014 |
| Kaye Higgs Aesthetics Ltd | Health & social care | 2018 |
| Kayen’S Kauldren Limited | Wholesale & retail | 2025 |
| Kayes Properties Ltd | Financial services | 2026 |
| Kaymycin Ltd | Health & social care | 2021 |
| KAZ Business Services Ltd | Administrative & support | 2013 |
| Kazama Investments Ltd | Real estate | 2023 |
| Kcutiebeauty Ltd | Wholesale & retail | 2024 |
| KD Optics Limited | Wholesale & retail | 2017 |
| KD Services Plus Ltd | Administrative & support | 2025 |
| Kellam Management Limited | Hospitality | 2011 |
| KEN Trading Ltd | Wholesale & retail | 2018 |
| Kenchington Limited | Real estate | 1961 |
| Kenelms Engineering Limited | Professional & scientific | 2012 |
| Kensington Park Gardens Limited | Financial services | 2024 |
| Kent House (Select) Limited | Health & social care | 2015 |
| Kent Street Autocentre Limited | Manufacturing | 2013 |
| Kerry Foley Management Limited | Administrative & support | 2011 |
| Kerry Mcdonald Associates Limited | Administrative & support | 2003 |
| Kestral Properties Limited | Real estate | 2019 |
| Keswich Properties Limited | Real estate | 2021 |
| Key Ductwork Services Limited | Construction | 2010 |
| Keyox Ltd | Transport & logistics | 2024 |
| Keystone Consultancy Limited | Administrative & support | 2013 |
| Keystone Training Ltd | Professional & scientific | 2005 |
| KG Driveways and Landscaping Limited | Construction | 2025 |
| KGP Heater Services Ltd | Construction | 2019 |
| KGS Engineering Ltd | Construction | 2023 |
| KH Properties Limited | Real estate | 2022 |
| Khan .Z.A Ltd | Health & social care | 2019 |
| KHS Trading Ltd | Wholesale & retail | 2025 |
| Khyber Shop 13 Ltd | Wholesale & retail | 2025 |
| Kiddaz Ltd | Public administration | 2019 |
| Kidderminster Hire Holdings Limited | Financial services | 2023 |
| Kiddies Kingdom Daycare Limited | Health & social care | 2015 |
| Kidding Around Limited | Information & communication | 1994 |
| Kiernan Holdings and Investments Ltd | Financial services | 2025 |
| Kilnhurst Limited | Wholesale & retail | 2017 |
| Kindred Holdings and Investments Ltd | Financial services | 2020 |
| Kindred Investments Ltd | Real estate | 2016 |
| Kindred Spirit Mortgage & Protection Limited | Financial services | 2025 |
| Kindred Ventures Limited | Other services | 2009 |
| Kingcrest Group Limited | Wholesale & retail | 2025 |
| Kingdom Ministries International | Other services | 2014 |
| Kingsland Grange (Streetly) Management Company Limited | Households | 2009 |
| Kingswinford Computer Repairs Limited | Other services | 2016 |
| Kingswinford Engineering Company Limited | Manufacturing | 1959 |
| Kingswinford Golf Centre Limited | Arts & recreation | 2012 |
| Kingswinford Jewellers Ltd | Wholesale & retail | 2014 |
| Kington Consultancy Services Limited | Real estate | 2013 |
| Kinlet Holdings Limited | Real estate | 2000 |
| Kinsen Quinze Holding Limited | Financial services | 2026 |
| Kinver Business Solutions Ltd | Professional & scientific | 2014 |
| Kinver Funeral Services Limited | Professional & scientific | 2000 |
| Kinver Holdings Ltd | Financial services | 2019 |
| Kinver Property Solutions Ltd | Real estate | 2019 |
| KIP Electrical Limited | Construction | 2019 |