| Kareem Property Ltd | Real estate | 2025 |
| Kari Holdings Ltd | Real estate | 2025 |
| Karid Productions Limited | Information & communication | 2017 |
| Karma Artists Ltd | Arts & recreation | 2012 |
| Karma Artists Management Limited | Arts & recreation | 2014 |
| Karma Bakehouse Limited | Wholesale & retail | 2021 |
| Karma Bread Limited | Manufacturing | 2014 |
| Karma Songs Ltd | Arts & recreation | 2012 |
| Karma Songs Squared Limited | Arts & recreation | 2025 |
| Kartec Car Services LLP | | 2010 |
| Karunaa Ltd | Health & social care | 2022 |
| KARUNAA1 Ltd | Health & social care | 2025 |
| KAS Decorators Ltd | Construction | 2018 |
| Kasami Properties Ltd | Real estate | 2020 |
| Kashie Inns Limited | Real estate | 2000 |
| Kastel Properties Ltd | Real estate | 2022 |
| Katalist Intelligent Solutions Ltd | Information & communication | 2025 |
| Katarina Speaking Ltd | Professional & scientific | 2021 |
| Kathmandu Connection Limited | Hospitality | 2013 |
| Katipo Props Ltd | Arts & recreation | 2019 |
| Katte & Co Ltd. | Information & communication | 2014 |
| Katz Ventures Ltd | Administrative & support | 2019 |
| Kaur Management Ltd | Professional & scientific | 2017 |
| Kavmed Limited | Health & social care | 2016 |
| Kawah Coffee Limited | Administrative & support | 2022 |
| Kayani Medics Ltd | Health & social care | 2011 |
| Kayani Properties Ltd | Real estate | 2023 |
| Kayes Court Properties Ltd | Real estate | 2020 |
| Kaza Business Consultants Limited | Financial services | 2016 |
| Kazim-Ott Limited | Hospitality | 2012 |
| KBS Marwah Limited | Health & social care | 2016 |
| KC Invest Limited | Hospitality | 2022 |
| KC London Investments Ltd | Real estate | 2026 |
| KCC Design Limited | Administrative & support | 2015 |
| KCG Technology Limited | Information & communication | 2026 |
| Kchg Hotel Limited | Hospitality | 2024 |
| KCL Associates Limited | Construction | 2018 |
| KDD Estates Ltd | Real estate | 2014 |
| Kdel Strauss Phillips Ltd | Professional & scientific | 2026 |
| Kdlong Consultancy Limited | Administrative & support | 2011 |
| KE Skills Limited | Education | 2018 |
| Keanes Construction Ltd | Construction | 2017 |
| Kedma Investments Limited | Financial services | 2025 |
| Keen Bean Camps Limited | Arts & recreation | 2018 |
| Keen Mind Ltd | Health & social care | 2013 |
| Keep Dancing Theatre Ltd | Arts & recreation | 2016 |
| Kehjo Limited | Real estate | 2019 |
| Keir Hardie Management Company Limited | Households | 2011 |
| Keliglo Ltd | Administrative & support | 2017 |
| Kelsall Group Limited | Professional & scientific | 1993 |
| Kelton Construction Services Ltd | Construction | 2023 |
| Kempton Contracts Ltd | Construction | 2017 |
| Kenfin Asset Management Limited | Other services | 2020 |
| Kenfin Holdings Limited | Other services | 2018 |
| Kennedy Place Management Company Limited | Households | 2008 |
| Kenneth S.Haas(Partners)Limited | Professional & scientific | 1970 |
| Kent & Sons Grab Services Ltd | Water & waste | 2018 |
| Kentaro Hirose Consulting Limited | Arts & recreation | 2016 |
| Kenville Limited | Real estate | 1983 |
| Kenwood House Management Limited | Professional & scientific | 2017 |
| Kerem Oscar & Co. Limited | Professional & scientific | 2011 |
| Kermalli Investments Limited | Health & social care | 2017 |
| Kersland Direct Limited | Wholesale & retail | 2010 |
| Ketchup Ventures LLP | | 2010 |
| Kettering Investment Properties Ltd | Real estate | 2021 |
| Keviron Ltd | Transport & logistics | 2025 |
| KEW Riverside Residents Company Limited | Households | 2000 |
| Key Professional Associates Limited | Professional & scientific | 2015 |
| Keyani Enterprises Limited | Health & social care | 2016 |
| Keydriver Limited | Administrative & support | 2013 |
| Keynest Limited | Real estate | 1999 |
| Kezmay London Limited | Extraterritorial | 2017 |
| Kfco Limited | Information & communication | 2013 |
| KH Construction and Engineering Ltd | Construction | 2022 |
| KH Electrical (UK) Ltd | Construction | 2013 |
| KH Finserv Ltd | Wholesale & retail | 2020 |
| Kh-Uk Investments Ltd | Other services | 2017 |
| Khafaji & Sons Properties Limited | Real estate | 2019 |
| Khalsons Windows and Doors Ltd | Construction | 2019 |
| Khan & Khan IT Solutions Ltd | Information & communication | 2016 |
| Khan Asia Limited | Wholesale & retail | 2024 |
| Khokhar Properties Limited | Real estate | 2015 |
| Khtl Property Limited | Real estate | 2025 |
| Khyber Management Ltd | Other services | 2020 |
| Kick Academy Limited | Health & social care | 2015 |
| Kids Count Limited | Education | 2006 |
| Kiing Pizza Widnes Ltd | Hospitality | 2022 |
| Kilchreest Property Management Ltd | Real estate | 2020 |
| Kilnbrook Limited | Wholesale & retail | 1979 |
| Kilo Legal Limited | Administrative & support | 2021 |
| Kilogram Clothing Limited | Manufacturing | 2022 |
| Kims Restaurant Limited | Hospitality | 2026 |
| Kinch Tree Surgeons Limited | Other services | 2019 |
| Kindlekids Limited | Professional & scientific | 2012 |
| Kinetic Centres Limited | Administrative & support | 1996 |
| Kinetic Wealth Management Limited | Professional & scientific | 2011 |
| Kingdom Witness Chapel International | Other services | 2014 |
| Kings Court (Bushey) Management Company Limited | Administrative & support | 2009 |
| Kings Farm Limited | Wholesale & retail | 2018 |
| Kingscote Design Ltd | Professional & scientific | 2012 |