| K T Lyric Ltd | Professional & scientific | 2018 |
| K Teller Ltd | Wholesale & retail | 2019 |
| K W Asset Management LLP | | 2023 |
| K Webb Holdings Limited | Professional & scientific | 2025 |
| K Wolff Contracting Limited | Public administration | 2015 |
| K Young Construction Ltd | Construction | 2021 |
| K&B Facilities Group Ltd | Wholesale & retail | 2024 |
| K&B Halal Food Distributors Ltd | Wholesale & retail | 2019 |
| K&B Homes Ltd | Construction | 2017 |
| K&F Consulting Limited | Information & communication | 2017 |
| K&F Realm Ltd | Wholesale & retail | 2025 |
| K&K Creative Arts and Designs Ltd | Construction | 2025 |
| K&K Fruits & Flowers Ltd | Administrative & support | 2017 |
| K&K Industries CYF | Wholesale & retail | 2025 |
| K&K Nails and Beauty Ltd | Other services | 2025 |
| K&Mj Holdings Limited | Financial services | 2025 |
| K&O Contracting Ltd | Administrative & support | 2024 |
| K&P Plus Ltd | Other services | 2024 |
| K&R International (London) Ltd | Transport & logistics | 2019 |
| K&T Trading Ltd | Wholesale & retail | 2025 |
| K&W Asset Management Limited | Real estate | 2018 |
| K&W International Limited | Hospitality | 2019 |
| K&W Properties SW Ltd | Real estate | 2023 |
| K'S Computers Limited | Real estate | 2003 |
| K-Beartech Limited | Information & communication | 2012 |
| K-Pac Trade Ltd | Real estate | 2020 |
| K-Tech Electrical Ltd | Manufacturing | 2015 |
| K-Tech NW Limited | Wholesale & retail | 2024 |
| K-Threads Ltd | Wholesale & retail | 2025 |
| K. Nash (Goldsmiths) (1996) Limited | Wholesale & retail | 1996 |
| K.4.K. Properties Limited | Real estate | 2019 |
| K.A.F Logistics & Services Limited | Transport & logistics | 2026 |
| K.C Regan Property Ltd | Real estate | 2024 |
| K.D.W. Cyber Consulting Limited | Other services | 2020 |
| K.E.M. Building Services Limited | Wholesale & retail | 1991 |
| K.G Deals UK Ltd | Wholesale & retail | 2026 |
| K.G.Boykov Ltd | Construction | 2017 |
| K.M.H.M Ltd | Construction | 2017 |
| K.N. Gould Limited | | 1975 |
| K.S.J. Knitwear Limited | Wholesale & retail | 1976 |
| K.S.S Global Enterprises Ltd | Wholesale & retail | 2021 |
| K.Y. Empire Group Holding Limited | Financial services | 2024 |
| K1 Group PLC | Construction | 2016 |
| K1 Household Goods Ltd | Wholesale & retail | 2025 |
| K2 Management Services Limited | Real estate | 2023 |
| K2BZ Limited | Real estate | 2014 |
| K2K Cleaning & Maintenance Limited | Administrative & support | 2026 |
| K3 Property Ltd | Real estate | 2016 |
| K6TECH Ltd | Arts & recreation | 2023 |
| K89 Consulting Limited | | 2013 |
| K89 Ltd | Other services | 2015 |
| K8TRAD Limited | Other services | 2019 |
| K9 Supplies Limited | Wholesale & retail | 2019 |
| KA Alis Ltd | Construction | 2019 |
| KA Companies Ltd | Transport & logistics | 2025 |
| KA Contracting Services Limited | Administrative & support | 2018 |
| KA Supermart Ltd | Wholesale & retail | 2025 |
| KA Supply Solutions Limited | Professional & scientific | 2012 |
| Kaany Limited | Other services | 2019 |
| Kaapoww! Cyfyngedig | Other services | 2024 |
| Kaatchi Ltd | Construction | 2008 |
| Kaavyana Limited | Construction | 2020 |
| Kabala Holdings Ltd | Financial services | 2025 |
| Kabaria Group Ltd | Professional & scientific | 2024 |
| Kabayan Builders Ltd | Construction | 2019 |
| Kabili Ltd | Hospitality | 2024 |
| Kabir Nessa Homes Ltd | Real estate | 2019 |
| Kablan Ltd | Construction | 2023 |
| Kach Ltd | Financial services | 2025 |
| Kacie LLC Ltd | Professional & scientific | 2012 |
| Kacmac Network Limited | Information & communication | 2008 |
| KAD Film Limited | Information & communication | 2016 |
| Kadaba Rajkumar Limited | Real estate | 2003 |
| Kadambande Ltd | Health & social care | 2012 |
| Kadar Trading PC | | 2017 |
| Kade Property Services Ltd | Construction | 2019 |
| Kader Fabrication Ltd | Manufacturing | 2011 |
| Kadir Cakir Ltd | Wholesale & retail | 2025 |
| Kaem Services Limited | Construction | 2018 |
| Kaeçen Group Ltd | Professional & scientific | 2025 |
| Kafc Limited | Hospitality | 2024 |
| Kafd Ltd | Wholesale & retail | 2025 |
| Kafeel Pilgrims Travel and Tours Private Limited | Transport & logistics | 2019 |
| Kafetoz Solutions Ltd | Wholesale & retail | 2021 |
| Kagbdgk Ltd | Information & communication | 2026 |
| Kagondal Ltd | Wholesale & retail | 2026 |
| Kahootz Media Ltd | Professional & scientific | 2016 |
| Kahsem Contracting Ltd | Construction | 2019 |
| Kahveci Limited | Information & communication | 2025 |
| Kaia Leather Crafts Ltd | Manufacturing | 2021 |
| Kaike Tjihero Ltd | Transport & logistics | 2025 |
| Kaila & Kaur Limited | Real estate | 2022 |
| Kaila & SON Ltd | Wholesale & retail | 2012 |
| Kailash Films Limited | Information & communication | 2016 |
| Kaili Mechanical Engineering., Ltd | Administrative & support | 2020 |
| Kairali Spices Centre Ltd | Wholesale & retail | 2023 |
| Kairos Ventures Limited | Professional & scientific | 2003 |
| Kairova Ltd | Manufacturing | 2025 |
| Kairu Media Ltd | Professional & scientific | 2019 |
| Kaisin Stores Ltd | Wholesale & retail | 2026 |