| KB Method Ltd | Arts & recreation | 2025 |
| KB Publishing Limited | Information & communication | 2023 |
| KB Trustway Ltd | Administrative & support | 2020 |
| KB3D Printing Ltd | Wholesale & retail | 2020 |
| KBB Brand Collective by ROB Taylor Ltd | Professional & scientific | 2026 |
| KBB Logistics & Storage Ltd | Transport & logistics | 2007 |
| Kbel IT Solutions Limited | Information & communication | 2026 |
| KBK Mechanical Services Ltd | Construction | 2026 |
| KBT Heating Ltd | Construction | 2015 |
| KC Graphics Ltd | Professional & scientific | 2013 |
| KC Sport Limited | Transport & logistics | 2019 |
| KCA Studio Ltd | Manufacturing | 2022 |
| KCD Consulting Services Limited | Other services | 2011 |
| KCG North LLP | | 2019 |
| KCN Construction Limited | Construction | 2008 |
| KCN Lounge Ltd | Hospitality | 2025 |
| Kcrad Ltd | Professional & scientific | 2016 |
| KD Courier Solutions Ltd | Transport & logistics | 2014 |
| KD Msquare Properties Limited | Real estate | 2023 |
| KD Pests Ltd | Administrative & support | 2025 |
| KD Property Holdings Limited | Real estate | 2025 |
| KDA Designs Limited | Professional & scientific | 2019 |
| KDA Plumbing and Heating Ltd | Construction | 2019 |
| KDC Care Ltd | Health & social care | 2025 |
| Kdmc Services Limited | Construction | 2012 |
| Kdpchimp Limited | Professional & scientific | 2025 |
| Kdperformance Ltd | Administrative & support | 2026 |
| KDS Mobile Catering Ltd | Hospitality | 2018 |
| KE Nian HU Ltd. | Wholesale & retail | 2025 |
| KE Properties (MK) Limited | Real estate | 2025 |
| Kean Developments Limited | Real estate | 2020 |
| Kearns Premier Homes Ltd | Construction | 2016 |
| Keats Family Law Ltd | Professional & scientific | 2020 |
| Kebabulous Ltd | Hospitality | 2024 |
| Kedaph Giving CIC | Other services | 2023 |
| Kedaph Schoolwear Limited | Wholesale & retail | 2014 |
| Kedaph Transport Ltd | Transport & logistics | 2015 |
| Kedar Infotech Ltd | Information & communication | 2022 |
| Kedrus Ltd | Extraterritorial | 2023 |
| Keeboo International CIC | Health & social care | 2025 |
| Keel Construction Ltd | Construction | 2016 |
| Keele Golf Development LLP | | 2013 |
| Keem Flooring Ltd | Construction | 2026 |
| Keen Tech Limited | Wholesale & retail | 2015 |
| Keenes Care Ltd | Health & social care | 2020 |
| Keenes Care Support Services Ltd | Health & social care | 2025 |
| Keens Shay Keens MK LLP | | 2013 |
| Keep Always Limited | Information & communication | 2009 |
| Keep Your Spirit Alive Ltd | Other services | 2018 |
| Keepabook Limited | Professional & scientific | 2019 |
| Keeping Kids OFF the Streets Limited Community Interest Company | Education | 2016 |
| Kegstar Limited | Administrative & support | 2015 |
| Keith Elkington Transport Limited | Transport & logistics | 2012 |
| Keith Emmett and Sons Limited | Administrative & support | 2018 |
| Keith Geoffrey Investments | Financial services | 2025 |
| Keith Wootton PR Limited | Professional & scientific | 2009 |
| Keke WEI Ltd. | Wholesale & retail | 2025 |
| Kella Properties Ltd | Real estate | 2021 |
| Kellaire Limited | Construction | 1987 |
| Kellavra Ltd | Information & communication | 2025 |
| Kelloran Limited | Real estate | 1984 |
| Kelly & Kids Ltd | Administrative & support | 2015 |
| Kelly Haynes Official Limited | Other services | 2019 |
| Kelly Pubs Limited | Hospitality | 2025 |
| Kelman Properties Limited | Real estate | 2017 |
| Kelmar Cleaning Services Limited | Other services | 2014 |
| Kelsey's Payroll Services Limited | Professional & scientific | 2012 |
| Kelson Estate Ventures Ltd | Real estate | 2025 |
| Kelson Limited | Health & social care | 2021 |
| Kemarcoms Concepts Ltd | Wholesale & retail | 2018 |
| Kemdave Ventures Ltd | Wholesale & retail | 2025 |
| Kemdra Consulting Limited | Professional & scientific | 2020 |
| Kemet Holding Ltd | Financial services | 2022 |
| Kemnco Ltd | Wholesale & retail | 2021 |
| Kemp Family Limited | Professional & scientific | 2010 |
| Kempsons Stud Limited | Agriculture & fishing | 2011 |
| KEN Care Ltd | Health & social care | 2021 |
| KEN Harris Dentistry Limited | Health & social care | 2022 |
| Kenbrit Limited | Health & social care | 2018 |
| Kendise Property Investments Ltd | Real estate | 2024 |
| Kendo Group of Companies Ltd | Wholesale & retail | 2025 |
| Kendrick Management Consultants Limited | Professional & scientific | 2025 |
| Kenect (South Midlands) Limited | Administrative & support | 2023 |
| Keneolisa Work Health Ltd | Health & social care | 2021 |
| Keniji Beauty Ltd | Administrative & support | 2016 |
| Keniji Luxury Homes Limited | Health & social care | 2024 |
| Kenka Engineering Services Ltd | Professional & scientific | 2020 |
| Kenley Partners Limited | Professional & scientific | 2011 |
| Kennaj Limited | Wholesale & retail | 2023 |
| Kennedy and Foster Limited | Real estate | 2019 |
| Kennington Car Sales Limited | Wholesale & retail | 2013 |
| Kenorland Ltd | Agriculture & fishing | 2015 |
| Kensington Benefits Ltd | Professional & scientific | 2026 |
| Kensington Place Management (NO 1) Limited | Households | 1996 |
| Kensington Place Management (NO 2) Limited | Households | 1996 |
| Kensington Place Management (NO 3) Limited | Households | 1996 |
| Kensy Property Investments Ltd | Real estate | 2022 |
| Kents Hill Consultancy Limited | Information & communication | 2001 |
| Kents Hill Stores Limited | Wholesale & retail | 2014 |
| Kenzoe Properties Ltd | Real estate | 2024 |