| Kegas Limited | Administrative & support | 2020 |
| Kela Analytics Limited | Information & communication | 2025 |
| Kelan Healthcare Limited | Health & social care | 2026 |
| Kellica Limited | Wholesale & retail | 2019 |
| Kellison Classic Cars Limited | Wholesale & retail | 2017 |
| Kelly’S Professional Management Services Ltd | Professional & scientific | 2025 |
| Kelvamy Medicals Limited | Health & social care | 2023 |
| Kemade Medicare Limited | Health & social care | 2023 |
| Kempwood Property Trading Limited | Real estate | 1995 |
| KEN Brown Motor Group Limited | Financial services | 2023 |
| Kenamy Ltd | Health & social care | 2022 |
| Kenebarn Enterprises Limited | Health & social care | 2025 |
| Keneezeokoli Limited | Health & social care | 2024 |
| Kenex (Electro-Medical) Limited | Manufacturing | 1970 |
| Kenex Limited | Professional & scientific | 1983 |
| Keniabu Ltd | Health & social care | 2025 |
| Kenjoe Properties Ltd | Real estate | 2023 |
| Kenmoe Limited | Health & social care | 2022 |
| Kennet Management Company Limited | Households | 1994 |
| Kenny Evans Electrical Ltd | Construction | 2017 |
| Kennybolu Limited | Health & social care | 2016 |
| Kennykrafts Limited | Wholesale & retail | 2017 |
| Kensam Ltd | Health & social care | 2021 |
| Kensington Court (Hendon) Management Company Limited | Households | 2004 |
| Kensington Court (Hendon) RTM Company Limited | Households | 2013 |
| Kente Collection Ltd | Wholesale & retail | 2020 |
| Kenya Capital Limited | Financial services | 2021 |
| Keoga Fit Limited | Arts & recreation | 2020 |
| Kepa Trans Limited | Transport & logistics | 2018 |
| Kernow Laudonia Ltd | Financial services | 2019 |
| Kesh Integrated Services Ltd. | Manufacturing | 2014 |
| Kesthowhe Consults Ltd | Health & social care | 2022 |
| Keth TAI Ltd | Health & social care | 2023 |
| Kevin Smith Editing Services Ltd | Information & communication | 2013 |
| Kewmark Limited | Construction | 2006 |
| Key Builds & Maintenance Ltd | Construction | 2023 |
| Key Summit Properties Ltd | Real estate | 2017 |
| Keydome Limited | Real estate | 1998 |
| Keynest Property Investments Ltd | Real estate | 2025 |
| Keyspace Letting and Construction Ltd | Construction | 2026 |
| KFK Building Services Ltd | Construction | 2023 |
| KGK Genix (Holdings) Ltd | Other services | 2020 |
| KGK Genix Limited | Manufacturing | 2009 |
| KGK Genix Property Ltd | Real estate | 2020 |
| Kgunner Ltd | Professional & scientific | 2025 |
| KGX Creations Ltd | Wholesale & retail | 2016 |
| Kharis Medical Services Ltd | Health & social care | 2026 |
| Khatoon Services Ltd | Agriculture & fishing | 2023 |
| KHB Limited | Construction | 1997 |
| Khrosam Limited | Health & social care | 2023 |
| Kick and Stick Academy Ltd | Arts & recreation | 2025 |
| Kiddovista Limited | Wholesale & retail | 2026 |
| Kidwai U&F Limited | Health & social care | 2024 |
| Kidz OK Ltd | Education | 2004 |
| Kielder House (Lydney) Management Company Limited | Households | 2012 |
| Kiibase Ltd | Information & communication | 2025 |
| Kiks Beauty Palace Ltd | Other services | 2026 |
| Kill & Cure Ltd | Administrative & support | 2022 |
| Kimati Cleaning Services Ltd | Administrative & support | 2026 |
| Kindex Health Limited | Health & social care | 2023 |
| Kinetic Ideas Limited | Wholesale & retail | 2025 |
| Kinetiq Underwriting Ltd | Financial services | 2020 |
| Kinetix Delta Ltd | Professional & scientific | 2026 |
| King Services Ltd | Other services | 2017 |
| Kingdom Thirst CIC | Hospitality | 2023 |
| Kingdom Thirst Global Ltd | Wholesale & retail | 2023 |
| Kingsmead (Waltham Abbey) Management Company Limited | Households | 1995 |
| Kingsmoor Limited | Professional & scientific | 2020 |
| Kingsway Deliverie's Ltd | Transport & logistics | 2019 |
| Kingwood Services Ltd | Administrative & support | 2019 |
| Kinrop Investment Ltd | Real estate | 2026 |
| Kinsey Place (Linton) Management Company Limited | Households | 2015 |
| Kircay Holdings Ltd | Real estate | 2025 |
| Kisito Okpere Estate Ltd | Real estate | 2022 |
| KJ Group Sales Limited | Wholesale & retail | 2024 |
| KJ Teeptop Ltd | Wholesale & retail | 2022 |
| KK Diamondcare Ltd | Health & social care | 2026 |
| KK Medics Ltd | Other services | 2024 |
| KL Hair Limited | Other services | 2021 |
| Klean AF Ltd | Water & waste | 2025 |
| Klin Security and Services Ltd | Other services | 2019 |
| KLR Design Limited | Other services | 2016 |
| Klubshop Ltd | Wholesale & retail | 2020 |
| KM Creative Consultancy Ltd | Professional & scientific | 2019 |
| KMA Business Consultancy Ltd | Professional & scientific | 2024 |
| Kmaria Global Ltd | Health & social care | 2019 |
| Kmjb Transport Services Ltd | Transport & logistics | 2014 |
| KMS Homes Ltd | Real estate | 2023 |
| KN Creative Media Ltd | Information & communication | 2012 |
| KN Estates Limited | Real estate | 2013 |
| KN Timber Limited | Administrative & support | 2010 |
| Knewrow Limited | Professional & scientific | 2022 |
| Knight Installation Services Limited | Construction | 2017 |
| Knightley Limited | Wholesale & retail | 2023 |
| Knightsbridge Trading Academy Ltd | Education | 2015 |
| Knolly's Nursery Management Company Limited | Households | 2016 |
| Knowles Property Maintenance Ltd | Construction | 2025 |
| Knoxida Limited | Administrative & support | 2021 |
| KNS PVT Ltd | Wholesale & retail | 2026 |
| Knte Limited | Wholesale & retail | 2025 |