| Kicks Taekwon-Do Academy LLP | | 2025 |
| Kickstart Capital Limited | Extraterritorial | 2019 |
| Kiddie Smiles Limited | Health & social care | 2024 |
| Kidero Ltd | Health & social care | 2014 |
| Kidgo Ltd | Wholesale & retail | 2023 |
| Kids-In-Charge Child Care Ltd | Health & social care | 2022 |
| Kiel Seating UK Limited | Manufacturing | 2007 |
| Kiempire Limited | Real estate | 2026 |
| Kigelia Pharma Limited | Administrative & support | 2019 |
| Kigo Entertainment UK Limited | Information & communication | 2023 |
| Kiing Parks Limited | Arts & recreation | 2022 |
| Kila Automotive Ltd | Transport & logistics | 2024 |
| Kilkenny Ltd | Financial services | 2022 |
| Kilo 6 Limited | Public administration | 2023 |
| Kimber Capital Consulting Ltd | Professional & scientific | 2025 |
| Kimber Capital Holdings Ltd | Financial services | 2025 |
| Kimber Capital Travel Ltd | Information & communication | 2025 |
| Kimberley Davies Aesthetics Limited | Administrative & support | 2023 |
| Kimberley House Holdings Limited | Financial services | 2023 |
| Kimboard Limited | Construction | 1978 |
| Kimp Pubs Limited | Hospitality | 2025 |
| KIN Corporation Limited | Information & communication | 2025 |
| Kinchit Kinkara Seva Limited | Other services | 2026 |
| Kinderfield Close Management Company Ltd | Households | 2019 |
| Kinderkare Day Nurseries Ltd | Real estate | 2004 |
| Kindr International Ltd | Information & communication | 2020 |
| Kinect International Ltd | Manufacturing | 2017 |
| Kinetech Group Limited | Financial services | 2025 |
| Kinetic BMS Limited | Information & communication | 2019 |
| Kinetic Broadcast Ltd | Extraterritorial | 2024 |
| Kinetic Construction Limited | Professional & scientific | 2016 |
| Kinetic Property Limited | Real estate | 2016 |
| Kinetic Solutions Limited | Information & communication | 1996 |
| Kineticdigital Ltd | Information & communication | 2012 |
| Kinetics Wellness Limited | Wholesale & retail | 2024 |
| Kinetik Spaces Limited | Construction | 2025 |
| Kinetiq Holdings Ltd | Other services | 2022 |
| Kinfos Events Private Limited | Administrative & support | 2011 |
| King Family Investments | Financial services | 2024 |
| King Farming Company Ltd | Agriculture & fishing | 2023 |
| King's Church (Milton Keynes) | Other services | 2004 |
| Kingdom Consult Limited | Hospitality | 2014 |
| Kingdom Music Initiative Ltd | Information & communication | 2022 |
| Kingfisher Kitchen Solutions Ltd | Manufacturing | 2022 |
| Kings Chase (Berkhamsted) Management Company Limited | Households | 2005 |
| Kings Chase Residents Company Limited | Households | 1998 |
| Kings Comfort Food Ltd | Hospitality | 2021 |
| Kingsbridge Educational Trust | Education | 2014 |
| Kingsfield Homes Limited | Construction | 2018 |
| Kingshurst Badsey Management Company Limited | Households | 2017 |
| Kingskettle Consulting Limited | Extraterritorial | 2024 |
| Kingsland Farm Livery Ltd. | Agriculture & fishing | 2015 |
| Kingsley Court RTM Company Limited | Administrative & support | 2009 |
| Kingsley Grove Development Ltd | Construction | 2018 |
| Kingsley Merchant Ltd | Manufacturing | 2020 |
| Kingsleys Management Services Limited | Health & social care | 2013 |
| Kingsmead (Milton Keynes) Limited | Real estate | 1999 |
| Kingsmead Building Services Limited | Administrative & support | 2018 |
| Kingsmead Conversions Limited | Construction | 2011 |
| Kingsmead Residents Association (Dunstable) Ltd | Households | 1998 |
| Kingsmount Residents Company Limited | Households | 1997 |
| Kingston Care Limited | Health & social care | 2023 |
| Kingsway Property Maintenance Limited | Construction | 2006 |
| Kingsway Spirit Limited | Wholesale & retail | 2026 |
| Kingswell Consultancy Ltd | Information & communication | 2014 |
| Kingswood Land & Estates (2025) Ltd | Construction | 2022 |
| Kingswood Land & Estates (Agency) Ltd | Real estate | 2023 |
| Kingswood Property Holdings Ltd | Real estate | 2024 |
| Kingunderstated Limited | Wholesale & retail | 2018 |
| Kinnara Ltd | Education | 2010 |
| Kinson Direct Ltd | Wholesale & retail | 2023 |
| Kintos Consulting Limited | Information & communication | 2021 |
| Kiosha Limited | Real estate | 2016 |
| KIP Mcgrath Education Centre (MK) LP | | 2012 |
| KIP Property Solutions Ltd | Real estate | 2020 |
| Kiran Infotech Limited | Information & communication | 2015 |
| Kirkham (Beckton) Management Company Limited | Households | 2011 |
| Kirkland Contractors Ltd | Construction | 2026 |
| Kirklevington Leisure Ltd | Hospitality | 2023 |
| Kirori Properties Ltd | Real estate | 2020 |
| Kirstylee Properties Ltd | Hospitality | 2021 |
| Kisfit Limited | Wholesale & retail | 2012 |
| Kiss of Wine Limited | Wholesale & retail | 2020 |
| KIT Belofsky Limited | Professional & scientific | 2022 |
| KIT Services Limited | Manufacturing | 2022 |
| Kitani Motor UK Limited | Wholesale & retail | 2023 |
| Kitchen and More Ltd | Construction | 2015 |
| Kitchen Compass Ltd | Professional & scientific | 2025 |
| Kitchen Studio Limited | Wholesale & retail | 2002 |
| Kitchennest Ltd | Wholesale & retail | 2024 |
| Kitchens MK Ltd | Construction | 2024 |
| Kitchensmart Limited | Wholesale & retail | 2010 |
| Kites & Flyers Limited | Information & communication | 2019 |
| Kitroyale Ltd | Wholesale & retail | 2018 |
| KITS4YOU Ltd | Wholesale & retail | 2026 |
| Kitstar Music Group Limited | Arts & recreation | 2020 |
| Kitu Kali Limited | Wholesale & retail | 2018 |
| Kiwee Driving School Ltd | Education | 2026 |
| Kiwi IT Limited | Professional & scientific | 2007 |
| Kiwi Skin Limited | Health & social care | 2015 |