| Kasa Capital Ltd | Real estate | 2025 |
| Kasama Investments Ltd | Real estate | 2024 |
| Kasb Limited | Health & social care | 2008 |
| Kase Developments Ltd | Construction | 2008 |
| Kasedo Games Ltd | Information & communication | 2009 |
| Kash Grewal & Grewal Properties Ltd | Real estate | 2025 |
| Kash TEC Ltd | Information & communication | 2020 |
| Kashio Limited | Real estate | 2013 |
| Kashmir Football Association CIC | Education | 2021 |
| Kashmira Limited | Wholesale & retail | 2025 |
| Kashtabhanjan Ltd | Wholesale & retail | 2026 |
| Kasims Investments Limited | Real estate | 2020 |
| Kasmani Brothers Ltd | Wholesale & retail | 2024 |
| Kasmani Group Ltd | Wholesale & retail | 2024 |
| Kasper and Truck Ltd | Transport & logistics | 2026 |
| Kasper Hayes Limited | Wholesale & retail | 2018 |
| Kasrawi Holding Group Ltd | Financial services | 2023 |
| Kass Enterprises Limited | Other services | 2014 |
| Kassaki Ltd | Wholesale & retail | 2016 |
| Kassam Properties (UK) Limited | Real estate | 2021 |
| Kassco Ltd | Real estate | 2023 |
| Kaston Pioneer Ltd | Administrative & support | 2015 |
| Kasu's Care Agency Ltd | Health & social care | 2017 |
| Kasujiresidence Ltd | Real estate | 2026 |
| Kat-Uka Limited | Information & communication | 2001 |
| Kata Body Sculpt Ltd | Health & social care | 2020 |
| Kataria Leicester Limited | Hospitality | 2021 |
| Kataria Limited | Administrative & support | 2010 |
| Kataria Pizza Leicester Limited | Hospitality | 2024 |
| Katarinas Ltd | Professional & scientific | 2024 |
| Kate Mckenna Associates Limited | Professional & scientific | 2011 |
| Kate Ryan Limited | Real estate | 2006 |
| Kate Transport Services Ltd | Transport & logistics | 2024 |
| Katel Ltd | Real estate | 2026 |
| Katerina Consulting Ltd | Professional & scientific | 2024 |
| Katha Foods Ltd | Hospitality | 2025 |
| Katianna Ltd | Administrative & support | 2019 |
| Katie Lifestyle & Fitness Limited | Arts & recreation | 2021 |
| Katiyo Enterprise Limited | Health & social care | 2010 |
| Kato's Auto Centre Limited | Wholesale & retail | 2014 |
| Katsaros Trading Co. Ltd | Wholesale & retail | 2025 |
| Katwaroo Ltd | Real estate | 2020 |
| Katylous Limited | Education | 2013 |
| Kaur Business Consultants Ltd | Professional & scientific | 2025 |
| Kaur Financial Services Ltd | Financial services | 2016 |
| Kaurated Ltd | Arts & recreation | 2023 |
| Kaustoobh Ltd | Wholesale & retail | 2024 |
| Kauto Civils Ltd | Construction | 2019 |
| Kauto Plant Ltd | Administrative & support | 2021 |
| KAV&CAB24 Limited | Transport & logistics | 2025 |
| Kava and Sons Properties Ltd | Real estate | 2022 |
| Kavh Limited | Professional & scientific | 2013 |
| Kavi Dominic Ltd | Wholesale & retail | 2021 |
| Kavish Global Ventures Ltd | Wholesale & retail | 2025 |
| Kavva Ltd | Administrative & support | 2022 |
| Kavya (Leic) Ltd | Wholesale & retail | 2024 |
| Kavya Convenience Store Ltd | Wholesale & retail | 2024 |
| Kavya Foods Limited | Wholesale & retail | 2025 |
| Kavya Silks & Sarees PVT Limited | Wholesale & retail | 2011 |
| Kawe Medicals Limited | Health & social care | 2020 |
| Kawish Home Limited | Wholesale & retail | 2025 |
| KAY & KAY Property Services Ltd | Administrative & support | 2026 |
| KAY & M Properties Ltd | Real estate | 2020 |
| KAY ALI Ltd | Health & social care | 2012 |
| KAY and a Ltd | Hospitality | 2021 |
| KAY Aura Ltd | Extraterritorial | 2024 |
| KAY Business Consulting Limited | Administrative & support | 2023 |
| KAY CEE Care Services Ltd | Health & social care | 2014 |
| KAY Double Glazing Ltd | Construction | 2019 |
| KAY Handyman Services Ltd | Construction | 2026 |
| KAY KAY Investments Limited | Real estate | 2021 |
| KAY Singh Builders Ltd | Construction | 2024 |
| KAY Tech Consulting Ltd | Information & communication | 2020 |
| Kaya Construction London Limited | Construction | 2019 |
| Kaya’S Takeaway Limited | Hospitality | 2024 |
| Kaybee Properties Ltd | Real estate | 2025 |
| Kayfour Ltd | Administrative & support | 2024 |
| Kayish Limited | Other services | 2020 |
| Kaymensbeauty Limited | Other services | 2020 |
| Kays Home Care Services Limited | Health & social care | 2018 |
| Kaysengroup Ltd | Wholesale & retail | 2026 |
| Kaysons Ltd | Professional & scientific | 2024 |
| Kayuni Limited | Health & social care | 2012 |
| Kayvvi Limited | Real estate | 2023 |
| Kayz Kicks Ltd | Information & communication | 2022 |
| Kazaz & Company Ltd | Professional & scientific | 2026 |
| Kazbal Ltd | Administrative & support | 2025 |
| Kazfam Kitchen Systems Limited | Manufacturing | 1986 |
| Kazgas Ltd | Construction | 2021 |
| Kazzoo Limited | Information & communication | 2003 |
| KB Cladding Limited | Construction | 2022 |
| KB Foods Enterprise Ltd | Hospitality | 2025 |
| KB in the Community Limited | Arts & recreation | 2011 |
| KB Kakes Ltd | Manufacturing | 2024 |
| KB Portfolio Management Limited | Real estate | 2022 |
| KB Property Maintenance & Renovation Ltd | Construction | 2025 |
| KB Scaffolding(Leics) Ltd | Construction | 2013 |
| KB Trade Solutions Ltd | Wholesale & retail | 2025 |
| Kbay Investment Ltd | Financial services | 2025 |
| KBJ Store Limited | Wholesale & retail | 2022 |