| Khadi London CIC | Professional & scientific | 2023 |
| Khaled Alali for Trade Ltd | Wholesale & retail | 2024 |
| Khan & Co Limited | Construction | 2002 |
| Khan Capital Limited | Financial services | 2017 |
| Khan Capital Properties Ltd | Real estate | 2018 |
| Khan Crescent Ltd | Real estate | 2023 |
| Khan FIX Glazing Ltd | Construction | 2026 |
| Khan Holdings Ipswich Ltd | Real estate | 2023 |
| Khan Invest Limited | Real estate | 2019 |
| Khan Kebab Limited | Hospitality | 2026 |
| Khan Properties Management Limited | Construction | 2004 |
| Khan Real Estate Limited | Real estate | 2004 |
| Khan Towers Holdings Limited | Construction | 2022 |
| Khans BROTHER123 Limited | Wholesale & retail | 2024 |
| Khloris Ltd | Wholesale & retail | 2019 |
| KHS Logistics Ltd | Transport & logistics | 2021 |
| Khudsontherapy Ltd | Health & social care | 2024 |
| Kiaren Ventures Ltd | Hospitality | 2017 |
| Kick! Music Schools Limited | Information & communication | 2016 |
| Kickstart Fitness Ltd | Administrative & support | 2017 |
| Kickstart Gym Ltd | Administrative & support | 2021 |
| Kickstart Martial Arts Ltd | Other services | 2022 |
| Kidioma Limited | Wholesale & retail | 2016 |
| Kierowcauk Ltd | Transport & logistics | 2016 |
| Killingham Group Limited | Real estate | 2021 |
| Kiln Close Management Company Limited | Real estate | 2014 |
| Kilo Watt Blue Ltd | Administrative & support | 2010 |
| Kim's Katering Ltd | Hospitality | 2023 |
| Kimat Singh Limited | Professional & scientific | 2024 |
| Kimberly Designs Limited | Administrative & support | 2014 |
| Kinch Road (Stowupland) Management Co Ltd | Real estate | 2024 |
| Kindwell Estates Ltd | Households | 2025 |
| Kindwell Holdings Limited | Real estate | 2025 |
| Kinesis Insight Limited | Professional & scientific | 2017 |
| Kinetic Revolution Ltd | Wholesale & retail | 2013 |
| Kinfolk Workshop Ltd | Wholesale & retail | 2023 |
| King Consultancy Services Limited | Professional & scientific | 2021 |
| King Electrical Installations Limited | Construction | 2007 |
| King of Trees Ltd | Agriculture & fishing | 2022 |
| Kingbab Ltd | Hospitality | 2026 |
| Kingdom Training Associates Limited | Extraterritorial | 2015 |
| Kingdom US Limited | Professional & scientific | 2018 |
| Kingfisher & Son's Ltd | Construction | 2023 |
| Kingfisher Place (Leiston) Management Company Limited | Real estate | 2015 |
| Kingfishers Pulse Ltd | Arts & recreation | 2019 |
| Kingham Group Ltd | Real estate | 2021 |
| Kinglake Motor Cycles Limited | Wholesale & retail | 1995 |
| Kingley Grove (Melbourn) Management Company Limited | Households | 2018 |
| Kings Court (Colchester) Limited | Administrative & support | 2005 |
| Kings Court Management (Newmarket) Limited | Real estate | 1994 |
| Kings River Education Ltd | Education | 2018 |
| Kingsfleet Independent Financial Planning LLP | | 2013 |
| Kingsfleet Wealth Limited | Financial services | 2009 |
| Kingsfleet Worldwide Logistics Limited | Financial services | 2001 |
| Kingsland Hamilton Ltd | Professional & scientific | 2023 |
| Kingsland Linassi Limited | Professional & scientific | 2008 |
| Kingsmead Property Services Ltd | Construction | 2024 |
| Kingsway Group Ltd | Professional & scientific | 1949 |
| Kingswood Village Limited | Construction | 2017 |
| Kingwood Anglia Builders Limited | Construction | 1983 |
| Kingwood Investments Limited | Construction | 1983 |
| Kink Match Ltd | Other services | 2025 |
| Kinnear Analytics Limited | Information & communication | 2024 |
| Kinsman Advisory Service Ltd | Professional & scientific | 2022 |
| Kinsman Enterprise Ltd | Wholesale & retail | 2019 |
| Kintreks Solutions Ltd | Wholesale & retail | 2025 |
| Kinvestment Group Ltd | Real estate | 2019 |
| KIP Brown Limited | Information & communication | 2018 |
| KIP Mcgrath Tuition Ipswich West LP | | 2024 |
| Kirkov & Co Limited | Wholesale & retail | 2026 |
| Kirkton Legal Services LLP | | 2022 |
| Kirstie Moore Limited | Arts & recreation | 2025 |
| Kirton Aquatics and Pets Ltd | Wholesale & retail | 2026 |
| Kirton Fandor Limited | Professional & scientific | 2023 |
| Kirton Farming Limited | Agriculture & fishing | 2009 |
| Kisan Ltd | Transport & logistics | 2021 |
| Kiss-Reti Ltd | Transport & logistics | 2019 |
| Kitchen Worktops Online Ltd | Wholesale & retail | 2022 |
| Kiter Group Ltd | Wholesale & retail | 2024 |
| Kittenish Behaviour Designs Limited | Administrative & support | 2012 |
| Kitty & EM Ltd | Wholesale & retail | 2021 |
| Kiwada Investment & Construction Group Ltd | Financial services | 2017 |
| KJJ (Ipswich) Limited | Real estate | 1962 |
| KJL Building Maintenance Ltd | Construction | 2024 |
| Kjlholistics Ltd | Health & social care | 2021 |
| Kjling Limited | Wholesale & retail | 2024 |
| KJR Tyre Service Ltd | Wholesale & retail | 2025 |
| KJS Engineering Solutions Limited | Professional & scientific | 2016 |
| KK Network Ltd | Wholesale & retail | 2026 |
| KKB Property Maintenance Ltd | Manufacturing | 2021 |
| KKS Consulting Services Limited | Extraterritorial | 2011 |
| Kksmy Holdings Ltd | Financial services | 2023 |
| Kkta Limited | Transport & logistics | 2025 |
| KLA Trans Ltd | Transport & logistics | 2020 |
| Klaudia Kepa Ltd | Information & communication | 2025 |
| Klaus Union (U.K.) Limited | Manufacturing | 1987 |
| Klean Kings Limited | Administrative & support | 2021 |
| KLH Arch Trustee Limited | Extraterritorial | 2021 |
| KLH Architects Limited | Professional & scientific | 2001 |
| Klipspringer Holdings Limited | Financial services | 2018 |