| JV Construction Services Ltd | Construction | 2025 |
| Jvaisin Limited | Information & communication | 2025 |
| JW Car Experts Ltd | Transport & logistics | 2015 |
| JW Pilates Guildford Limited | Arts & recreation | 2022 |
| JW Pipework Services Limited | Construction | 2023 |
| JW Profix Ltd | Construction | 2025 |
| JW SPV Limited | Real estate | 2025 |
| JW Technology Consulting Ltd | Professional & scientific | 2023 |
| JWA Trading Solutions Ltd | Wholesale & retail | 2025 |
| Jweh Ltd | Financial services | 2021 |
| JYS Medical Ltd | Health & social care | 2022 |
| JZ Electrical Limited | Construction | 2006 |
| K & C Resolutions Limited | Wholesale & retail | 1997 |
| K & L Lettings Limited | Real estate | 2017 |
| K & N Medical Limited | Health & social care | 2025 |
| K a Sutherland Ltd | Health & social care | 2026 |
| K and J Moreton Services Limited | Other services | 1998 |
| K E Roberts Ltd | Professional & scientific | 2020 |
| K Farm Ford END Ltd | Agriculture & fishing | 2022 |
| K G Personnel Ltd | Administrative & support | 2015 |
| K Harman Associates Ltd | Administrative & support | 1998 |
| K Larcher Limited | Other services | 2000 |
| K M Bell Building & Landscaping Limited | Construction | 2011 |
| K O T B Limited | Arts & recreation | 2014 |
| K Planning Limited | Professional & scientific | 2024 |
| K&D Hoxha Plumbing Ltd | Construction | 2023 |
| K&G Properties Investment Ltd | Real estate | 2025 |
| K&Rl Associates Ltd | Professional & scientific | 2022 |
| K-Line Trading (London) Ltd | Construction | 2013 |
| K-Mtech Ltd | Manufacturing | 2021 |
| K. Jordan Consulting Ltd | Information & communication | 2016 |
| K.A.G Insulation Services Limited | Construction | 2016 |
| K.C.Hvac Ltd | Construction | 2025 |
| K.George Antiques Ltd | Wholesale & retail | 2018 |
| K.J. Sinnott Electrical Limited | Construction | 1997 |
| K.Jcrownproducts Limited | Wholesale & retail | 2021 |
| K.Jcrownproperties Limited | Real estate | 2020 |
| K.P. Developments Limited | Real estate | 1961 |
| K3T Solutions Ltd | Professional & scientific | 2024 |
| K4S Support Services Ltd | Hospitality | 2015 |
| K4W Ltd | Real estate | 2024 |
| Kaam Healthcare Ltd | Health & social care | 2021 |
| Kaani Kaana Foundation C.I.C. | Health & social care | 2026 |
| Kaani Kaana Ltd | Hospitality | 2021 |
| Kachi- Hubs Service Limited | Health & social care | 2023 |
| Kada Quercus Ltd | Real estate | 2022 |
| Kadir Kebab Ltd | Hospitality | 2021 |
| Kafaji Ltd | Professional & scientific | 2025 |
| Kafson Consulting Limited | Professional & scientific | 2011 |
| Kafson Property Limited | Real estate | 2018 |
| Kaftanas Ltd | Wholesale & retail | 2025 |
| Kai&Lui Ltd | Real estate | 2025 |
| Kaiyura Ltd | Wholesale & retail | 2026 |
| Kaizen 360 Compliance Ltd | Professional & scientific | 2018 |
| Kaizen A1 Ltd | Health & social care | 2024 |
| Kaizen SI Limited | Construction | 2024 |
| Kaizen Staffing Solutions Limited | Administrative & support | 2019 |
| Kaizen Trade & Storage Ltd | Wholesale & retail | 2026 |
| Kajamanga Ltd | Transport & logistics | 2025 |
| Kakakhel Limited | Administrative & support | 2019 |
| Kaleland Limited | Real estate | 2022 |
| Kaligi Consulting & Advisory Ltd | Professional & scientific | 2024 |
| Kaligi Holdings Limited | Financial services | 2024 |
| Kallings Infotech Ltd | Information & communication | 2019 |
| Kalyard Consulting Ltd | Professional & scientific | 2023 |
| Kamelian Technologies Ltd | Information & communication | 2021 |
| Kampungku Malaysian Bites Limited | Hospitality | 2023 |
| Kandee.Ai Ltd | Information & communication | 2018 |
| Kandkperfumes Ltd | Wholesale & retail | 2024 |
| Kapri Homes Ltd | Financial services | 2024 |
| Kapruka UK Ltd | Real estate | 2013 |
| Karen Woolmer Associates Limited | Administrative & support | 2012 |
| Karhu Capital Ltd | Information & communication | 2026 |
| Karla Insights Limited | Professional & scientific | 2021 |
| Karmel Builders Limited | Construction | 2014 |
| Karnaz Trading Ltd | Wholesale & retail | 2020 |
| Kase Freight Ltd | Transport & logistics | 2021 |
| Kasipro Limited | Wholesale & retail | 2021 |
| Kasora Ltd | Information & communication | 2026 |
| Kastean Construction Ltd | Construction | 2019 |
| Kate Edwards HR Solutions Ltd | Administrative & support | 2022 |
| Kate Ward Theatre Schools Limited | Arts & recreation | 2018 |
| Katie Houghton Limited | Administrative & support | 2015 |
| Katoli Building Surveyors Limited | Professional & scientific | 2022 |
| Katwils Investments Ltd | Financial services | 2022 |
| Katy Boyden Holdings Limited | Financial services | 2012 |
| Kaundinya Ltd | Information & communication | 2024 |
| Kaur EA Property Ltd | Construction | 2026 |
| Kay&Eskay Ltd | Information & communication | 2021 |
| Kayplot Limited | Information & communication | 1999 |
| Kayyes Limited | Information & communication | 2023 |
| KB Presents Limited | Professional & scientific | 2026 |
| KB Repping Ltd | Wholesale & retail | 2022 |
| KB Squared Ltd | Health & social care | 2022 |
| KB Tradax Limited | Wholesale & retail | 2019 |
| KB8 Electrical Ltd | Construction | 2019 |
| KBG Contractors Ltd | Construction | 2018 |
| Kbit Global Ltd | Information & communication | 2023 |
| KBO Connections Limited | Administrative & support | 2023 |
| KC Freight Limited | Transport & logistics | 2010 |