| Katzy Communications Ltd | Professional & scientific | 2002 |
| Kavya Enterprise Ltd. | Wholesale & retail | 2014 |
| Kawish Ltd | Real estate | 2021 |
| Kaya Information Technology Ltd | Information & communication | 2013 |
| Kaya Property Limited | Real estate | 2026 |
| Kaydan Decorators Limited | Construction | 2009 |
| KAZ Fruit and VEG Limited | Wholesale & retail | 2019 |
| Kazandibi Limited | Hospitality | 2018 |
| KC Healthcare Group Ltd | Administrative & support | 2022 |
| KCP (London) Limited | Education | 2026 |
| Kcre Limited | Construction | 2021 |
| KDD International Limited | Wholesale & retail | 2018 |
| Kdfts Limited | Real estate | 2025 |
| KDG Professional Ltd | Professional & scientific | 2012 |
| KDM Electrical Systems Ltd | Construction | 2017 |
| Keates Pipework Installation Limited | Construction | 2017 |
| Keating Jewellers Limited | Wholesale & retail | 2003 |
| Kebab Inn Limited | Manufacturing | 2024 |
| Kebab Knight Limited | Hospitality | 2019 |
| Keene Media Limited | Administrative & support | 2012 |
| Keepyou Limited | Wholesale & retail | 2025 |
| Keeth Fuel Ltd | Wholesale & retail | 2017 |
| Kek's Kitchen Ltd | Hospitality | 2019 |
| Keldin Engineering Limited | Professional & scientific | 2020 |
| Kells Resourcing Ltd | Professional & scientific | 2026 |
| KEN Tuohy Productions Ltd | Arts & recreation | 2008 |
| Kendle Residents Association Limited(The) | Households | 1970 |
| Kennett Kitchen Ltd | Hospitality | 2019 |
| Kent Leaseholds Limited | Real estate | 2020 |
| Kenzlaine Ltd | Financial services | 2023 |
| Kepler Gate Ltd | Information & communication | 2017 |
| Kerai Consultancy Limited | Professional & scientific | 2020 |
| Kerai Estates Limited | Real estate | 2020 |
| Kerion Properties Limited | Construction | 2003 |
| Kerneis Advisory Limited | Professional & scientific | 2019 |
| Kernel Labs Ltd | Information & communication | 2026 |
| Kerry Operations Ltd | Other services | 2025 |
| Key Life Financial Services Ltd | Financial services | 2011 |
| Key Wills Ltd | Professional & scientific | 2019 |
| KEY2PROP Ltd | Real estate | 2022 |
| Keycourt (V.W) Limited | Real estate | 2005 |
| Keycourt Limited | Real estate | 2005 |
| Keycroft Finance Limited | Financial services | 1984 |
| Keystar Locksmiths Ltd | Other services | 2024 |
| Keyzone Computer Products Limited | Information & communication | 1982 |
| Kezma Properties Limited | Real estate | 2020 |
| KFS Drinks Ltd | Wholesale & retail | 2024 |
| KG Accounting Services Limited | Professional & scientific | 2008 |
| Khandycorp Ltd. | Real estate | 2018 |
| Khansha Limited | Real estate | 2025 |
| Khetani Asset Management Ltd | Real estate | 2018 |
| Khetani Tech Solutions Ltd | Other services | 2024 |
| Khimu Holdings Limited | Financial services | 2020 |
| Khimu Limited | Real estate | 2019 |
| Kian Overseas Limited | Transport & logistics | 2022 |
| Kiaran Education Limited | Education | 2021 |
| Kidzact UK Limited | Wholesale & retail | 2025 |
| Kiersbox Limited | Arts & recreation | 2022 |
| KIG Properties Limited | Real estate | 2024 |
| Kikimora Editorial Limited | Information & communication | 2021 |
| Kimberley Capital Limited | Financial services | 2017 |
| Kimberley Peer Ventures One Ltd | Financial services | 2017 |
| Kimouri Consulting Ltd | Professional & scientific | 2023 |
| Kinder Success Limited | Professional & scientific | 2022 |
| Kinderox Maternity Services Ltd | Health & social care | 2024 |
| Kindle Property Investments Limited | Extraterritorial | 2012 |
| Kindling Sauna Ltd | Other services | 2024 |
| Kinebas Business Services (K.N.B.S.) Ltd | Professional & scientific | 2015 |
| Kingbro Development Limited | Financial services | 1970 |
| Kingbro Property Company Limited | Real estate | 1968 |
| Kings Arms (Harefield) Limited | Hospitality | 2009 |
| Kingsland Properties Limited | Real estate | 1998 |
| Kingsman Asset Management Ltd | Real estate | 2025 |
| Kingspride Investments Limited | Hospitality | 1995 |
| Kinnari Holdings Limited | Financial services | 2020 |
| Kinnari Investments Limited | Real estate | 2019 |
| Kinson Engineering Limited | Wholesale & retail | 2008 |
| Kiosk Design Services Ltd | Information & communication | 2024 |
| Kishor Planning and Delivery Limited | Professional & scientific | 2016 |
| Kisna Kripa Limited | Health & social care | 2026 |
| Kitflo Consulting Limited | Other services | 2023 |
| Kithar Clinic Ltd | Health & social care | 2025 |
| Kitty Love Vintage Limited | Wholesale & retail | 2022 |
| Kiwi Burst Design Ltd | Professional & scientific | 2021 |
| Kkam Investments Limited | Real estate | 2025 |
| Klean-Air International Limited | Health & social care | 1990 |
| Kleenz Limited | Other services | 2024 |
| Klein and Garsin Properties Ltd | Real estate | 2024 |
| Kleo (Ingoldmells) LLP | | 2024 |
| Klinton Limited | Real estate | 1999 |
| KM & H Investments Ltd | Real estate | 2022 |
| KM Albemarle Limited | Real estate | 2022 |
| KM Clinic Ltd | Health & social care | 2020 |
| KMB Services London Ltd | Transport & logistics | 2020 |
| Kmmg IT Solutions Ltd | Information & communication | 2016 |
| KMP ( Streatham) Limited | Construction | 2022 |
| KMP (Brixton) Limited | Construction | 2020 |
| KMP (East Dulwich) Ltd | Real estate | 2018 |
| KMP (Forest Gate) Limited | Construction | 2016 |
| KMP (High Wycombe) Limited | Construction | 2016 |