| Kavi RAZ Studios Ltd | Information & communication | 2023 |
| Kawaji Ltd | Manufacturing | 2021 |
| KAY Atelier Ltd | Wholesale & retail | 2026 |
| Kayamark Limited | Financial services | 2019 |
| Kaymen Worldwide Ltd | Manufacturing | 2024 |
| Kazi Property Management Ltd | Real estate | 2018 |
| Kazoku Workshop Limited | Wholesale & retail | 2023 |
| KB Sutton Coldfield Limited | Construction | 2013 |
| KBA IT Recruitment Limited | Administrative & support | 1994 |
| KBC Media Limited | Professional & scientific | 2026 |
| KBS (GB) Limited | Wholesale & retail | 2013 |
| Kbym Limited | Other services | 2022 |
| KCS Property Limited | Real estate | 2019 |
| KD Dynamics Ltd | Wholesale & retail | 2025 |
| KD Electrical Limited | Construction | 2025 |
| KD Sparkle and Shine Ltd | Administrative & support | 2024 |
| Kdaysout Limited | Arts & recreation | 2024 |
| KDB Care Ltd | Health & social care | 2023 |
| Kdee Designs Limited | Manufacturing | 2021 |
| KDS Building Services Ltd | Construction | 2023 |
| KDS Professional Services Ltd | Information & communication | 2025 |
| Kdse Limited | Wholesale & retail | 2024 |
| Keady Properties Ltd | Professional & scientific | 2020 |
| Keane Construction Group Ltd | Construction | 2018 |
| Kecp Limited | Real estate | 2021 |
| Kedar DTC UK Limited | Wholesale & retail | 2019 |
| Keeble Consultancy Limited | Professional & scientific | 2023 |
| Keelex 273 Limited | Construction | 2002 |
| Keeper's Meadow Residents Management Company Limited | Households | 2019 |
| Keethree Technologies Ltd | Information & communication | 2022 |
| Kegworth Gate Management Company Limited | Households | 2020 |
| Keighleycolo Ltd | Health & social care | 2009 |
| Keith Hodgskin Limited | Construction | 2026 |
| KEL Consulting Limited | Financial services | 2022 |
| KEL Property Investments Ltd | Real estate | 2022 |
| Kellington Properties Ltd | Real estate | 2018 |
| Kelly & Sons Ltd | Wholesale & retail | 2020 |
| Kelly Business Ltd | Real estate | 2020 |
| Kelly Cherry Ltd | Other services | 2023 |
| Kelly Homes (Birmingham) Ltd | Real estate | 2022 |
| Kelly Homes (GB) Limited | Real estate | 1998 |
| Kellyhopeaesthetics.Wellness Ltd | Other services | 2024 |
| Kellys Compassionate Care Ltd | Health & social care | 2024 |
| Kelsier Limited | Information & communication | 2018 |
| Kelso Care Consortium Limited | Health & social care | 1996 |
| Keltec Ltd | Professional & scientific | 2024 |
| Keltoy Consultancy Ltd | Construction | 2018 |
| Kelvin Medical Limited | Health & social care | 2021 |
| Kemley Properties Ltd | Real estate | 2021 |
| Kemp Technology Services Ltd | Information & communication | 2024 |
| Kemps Holdings Limited | Information & communication | 2007 |
| Kemps Publishing Limited | Information & communication | 1992 |
| Ken-Net Limited | Information & communication | 2023 |
| Kenelm Court RTM Company Limited | Households | 2009 |
| Kennelly Property Management Limited | Real estate | 2011 |
| Kensho Holistics Ltd | Health & social care | 2026 |
| Kensington Utility Solutions Ltd | Professional & scientific | 2024 |
| Kenstan Paragon Limited | Wholesale & retail | 2020 |
| Kenthetics Ltd | Other services | 2026 |
| Kenzz Limited | Education | 2025 |
| Kernes Property Group Ltd | Real estate | 2026 |
| Kesteven Copper Cylinders Limited | Extraterritorial | 1972 |
| Kestrel Court (Westvale Park) Resident Management Company Limited | Households | 2025 |
| Kestrel-Bce Limited | Extraterritorial | 2005 |
| KEV the Dent Ltd. | Wholesale & retail | 2001 |
| Kevin James Properties Ltd | Professional & scientific | 2025 |
| Key Homes 2019 Ltd | Real estate | 2019 |
| Key Lofts Ltd | Construction | 2024 |
| Key Stages Online Ltd | Education | 2004 |
| Keynance Learning Ltd | Information & communication | 2019 |
| Keystone Alliance Ltd | Real estate | 2024 |
| Keystone Castors Limited | Extraterritorial | 1963 |
| Keystone Property Developments (WM) Ltd | Construction | 2016 |
| Keystone Wood Limited | Wholesale & retail | 1954 |
| KG Build Division Limited | Construction | 2014 |
| Kgen Consulting Limited | Other services | 2014 |
| KH Curry Limited | Hospitality | 2024 |
| KH Developments Limited | Real estate | 2026 |
| Khadija Armani Ltd | Hospitality | 2019 |
| Khaksar UK Ltd | Real estate | 2022 |
| Khamah Ltd | Real estate | 2017 |
| Khandel Medical Ltd | Health & social care | 2022 |
| Kharchier Limited | Other services | 2025 |
| Khatija Foundation Ltd | Health & social care | 2024 |
| Khawaja & Sons Limited | Hospitality | 2003 |
| Kheen Limited | Wholesale & retail | 2025 |
| Khips Ltd | Real estate | 2020 |
| Khursheed Inayat Medical Ltd | Health & social care | 2023 |
| Khurshid Healthcare Limited | Health & social care | 2019 |
| Khush Consultancy Limited | Health & social care | 2015 |
| Khyber Property Group Limited | Real estate | 2020 |
| Khyber Property Services Ltd | Real estate | 2025 |
| KI Browtique Limited | Other services | 2025 |
| Kiani Locums Limited | Health & social care | 2010 |
| Kibirige Consultancy Limited | Professional & scientific | 2026 |
| Kicksandsteps Ltd | Wholesale & retail | 2026 |
| Kiddies Kutz Ltd | Other services | 2021 |
| Kiddies Organics Ltd | Wholesale & retail | 2024 |
| Kidz Academy Day Nursery Limited | Real estate | 2003 |
| KIE Electrical Ltd | Construction | 2023 |