| KE Design Ltd | Professional & scientific | 2010 |
| Keandok Ltd | Health & social care | 2020 |
| Kearns Associates Limited | Professional & scientific | 2003 |
| Keasden Heights Residents Ltd | Real estate | 2018 |
| Keelfin Ltd | Professional & scientific | 2018 |
| Keelson Tech Group Ltd | Information & communication | 2026 |
| Keenan Developments Limited | Real estate | 1987 |
| Keeney Group Limited | Professional & scientific | 2025 |
| Keeragh Holdings Limited | Financial services | 2018 |
| Keeragh Ltd | Wholesale & retail | 2015 |
| Keevy 2 Limited | Wholesale & retail | 2017 |
| Keevy Ltd | Wholesale & retail | 2016 |
| Keirhill Project Services Limited | Professional & scientific | 2025 |
| Kelela Limited | Professional & scientific | 2025 |
| Kelexco Ltd | Wholesale & retail | 2017 |
| Kelita Bignall Limited | Administrative & support | 2014 |
| Kellands (Hale) Holdings Limited | Financial services | 2014 |
| Kellands (Hale) Limited | Financial services | 1999 |
| Kellands Mortgage Services Limited | Financial services | 2014 |
| Kelly Burbanks Clarke Limited | Health & social care | 2022 |
| Kelly Chilton Collective Ltd | Financial services | 2025 |
| Kelly Harrison Solutions Limited | Information & communication | 2023 |
| Kelly Heating Ltd | Manufacturing | 2024 |
| Kelmar Software Solutions Limited | Information & communication | 1996 |
| Kelsall Consultancy Limited | Professional & scientific | 2012 |
| Kempton Homes (MCR) Limited | Real estate | 2022 |
| Kempton Homes Limited | Construction | 2000 |
| KEN & Connie Property Investment Ltd | Real estate | 2021 |
| KEN Coffey(Tyre Service)Limited | Wholesale & retail | 1961 |
| Kenay Paper Converting Limited | Extraterritorial | 2015 |
| Kendal Homes Limited | Real estate | 2024 |
| Kenfam Investments Limited | Professional & scientific | 2026 |
| Kenfic 2 Limited | Professional & scientific | 2024 |
| Kennedy Capital Investments Limited | Financial services | 2019 |
| Kennedy Hospitality Ltd | Hospitality | 2015 |
| Kennedy Operating Investments Limited | Financial services | 2019 |
| Kennedy Redford Limited | Professional & scientific | 2017 |
| Kennedy Renewable Developments Little Raith Limited | Professional & scientific | 2010 |
| Kennedy Renewables Commercial Solar Limited | Construction | 2024 |
| Kennedy Renewables Limited | Professional & scientific | 2008 |
| Kennedy Street Enterprises Limited | Arts & recreation | 1960 |
| Kennedy Street Holdings Limited | Professional & scientific | 1971 |
| Kennedy's Didsbury Ltd | Hospitality | 2025 |
| Kennedy's Turf Ltd | Administrative & support | 2007 |
| Kennedys Content Limited | Administrative & support | 2026 |
| Kennergy Developments Ltd | Households | 2023 |
| Kennex Aerospace Limited | Professional & scientific | 2026 |
| Kennypub Ltd | Hospitality | 2015 |
| Kensington Advisory Group Limited | Professional & scientific | 2024 |
| Kensington Gardens Management (Alderley Edge) Ltd | Real estate | 2015 |
| Kensington Real Estate Properties Ltd | Real estate | 2021 |
| Kentmere Automotive Limited | Wholesale & retail | 2023 |
| Kenuche Property Ltd | Real estate | 2019 |
| Kenway Miller Solicitors Ltd | Professional & scientific | 2011 |
| Kenzon Solutions Ltd | Information & communication | 2024 |
| Keoghs Nicholls Lindsell & Harris LLP | | 2016 |
| Kerala Properties Ltd | Real estate | 2020 |
| Kerberos Investment Ltd | Real estate | 2021 |
| Kerem Aras Limited | Transport & logistics | 2025 |
| Kestrian UK Limited | Professional & scientific | 2026 |
| Kettani Consulting Limited | Real estate | 2019 |
| KEV Daynes Property Developments Ltd | Construction | 2022 |
| Kevin Kent Ltd | Professional & scientific | 2018 |
| Kevin O'Connor Limited | Extraterritorial | 2024 |
| Key Forensic Services Limited | Professional & scientific | 2018 |
| Key Forensic Solutions Limited | Professional & scientific | 2018 |
| Key Leasing Limited | Administrative & support | 1980 |
| Keyimage Limited | Professional & scientific | 1985 |
| Keyring.Network Ltd | Information & communication | 2022 |
| Keys Property Group Ltd | Real estate | 2022 |
| Keysec 24 Ltd | Administrative & support | 2013 |
| Keysmith Limited | Information & communication | 2022 |
| Keystone Academic Consultants Ltd | Education | 2023 |
| Keystone Estates Limited | Real estate | 2003 |
| Keyteq Holdings Limited | Financial services | 2024 |
| Keyteq Presentation Services Limited | Administrative & support | 2000 |
| KFO Logistics Ltd | Transport & logistics | 2023 |
| KFP Energy Ltd | Construction | 2025 |
| KFW Consulting Limited | Administrative & support | 2016 |
| KG Tiling Ltd | Construction | 2024 |
| KGD Investments Ltd | Real estate | 2020 |
| KH Wilmslow Ltd | Wholesale & retail | 2022 |
| Khaled Zehry Ltd | Health & social care | 2017 |
| Khan Aesthetics Limited | Health & social care | 2025 |
| Khan Engineering Solutions Limited | Professional & scientific | 2023 |
| Khan Mather Ltd | Professional & scientific | 2013 |
| Khataam Ltd | Health & social care | 2025 |
| KHC Plastic Surgery Limited | Health & social care | 2016 |
| KHG Developments Ltd | Construction | 2022 |
| KHL Consultancy Limited | Information & communication | 2011 |
| Khursheed Services Ltd | Health & social care | 2014 |
| Khurshid Eagles Limited | Professional & scientific | 2024 |
| Kiami Consulting Limited | Professional & scientific | 2017 |
| Kibu Properties Limited | Real estate | 2019 |
| Kickworldwide Ltd | Education | 2020 |
| Kids Collective Limited | Health & social care | 2017 |
| Kids Doctor Limited | Health & social care | 2008 |
| Kids E-Health Ltd | Professional & scientific | 2023 |
| Kids Pass Limited | Other services | 2018 |
| Kids Pass Marketing Limited | Professional & scientific | 2016 |