| KI & KEN Limited | Hospitality | 2017 |
| KIA Property Limited | Real estate | 2016 |
| Kiarakiari International Ltd | Information & communication | 2015 |
| Kick ASS Drinks UK Limited | Extraterritorial | 2010 |
| Kick ASS Licensing Limited | Extraterritorial | 2010 |
| Kick ASS Limited | Extraterritorial | 1995 |
| Kickstart Trading Ltd | Education | 2019 |
| Kickstone Consulting Ltd | Administrative & support | 2011 |
| Kiczi Trans Ltd | Transport & logistics | 2018 |
| Kiddywinks (Chipping Campden) Limited | Education | 2006 |
| Kidglove K9 Ltd | Agriculture & fishing | 2025 |
| Kidijitali Limited | Information & communication | 2022 |
| Kidman Law Limited | Other services | 2018 |
| Kidswear Agent NW Ltd | Wholesale & retail | 2017 |
| Kidzrus Community Group Community Interest Company | Health & social care | 2022 |
| Kidzrus Nursery Ltd | Education | 2012 |
| Kiings Mini Market Warrington Ltd | Wholesale & retail | 2023 |
| Kilgeever Ltd | Administrative & support | 2022 |
| Kilkenny Engineering Services Limited | Manufacturing | 2015 |
| Killiecrankie Property Limited | Real estate | 2025 |
| Kilo Construction Limited | Construction | 2011 |
| Kilo Developments Limited | Construction | 2022 |
| Kilo Homes Limited | Real estate | 2020 |
| Kilo Mother Ltd | Administrative & support | 2026 |
| Kilsyth Innovative Ltd | Professional & scientific | 2017 |
| Kily Holding Limited | Hospitality | 2025 |
| KIM Mccarthy Limited | Health & social care | 2012 |
| Kiman Consulting Ltd | Professional & scientific | 2012 |
| Kimberly Basics Ltd | Wholesale & retail | 2023 |
| Kimwero Consultancy Ltd | Administrative & support | 2018 |
| Kinbis Ltd | Health & social care | 2007 |
| Kinda ZEN Ltd | Wholesale & retail | 2025 |
| Kinelawley Consultancy Limited | Professional & scientific | 2017 |
| Kingdom Property Investments (KPI) Ltd | Construction | 2023 |
| Kingfisher Quality Consultancy Ltd | Professional & scientific | 2025 |
| Kingham Software Limited | Administrative & support | 2013 |
| Kingpin Events Ltd | Arts & recreation | 2013 |
| Kings Cuts Barbers Limited | Other services | 2023 |
| Kings Cuts Traditional Barbers Ltd | Other services | 2025 |
| Kings Inspection Services Limited | Construction | 2014 |
| Kings Plant & Construction Services Limited | Manufacturing | 2001 |
| Kingsbere Publications Limited | Administrative & support | 2007 |
| Kingsland Fabrications Ltd | Manufacturing | 2022 |
| Kingsley Manor Phase 3 Limited | Households | 2025 |
| Kingsley Quarter Properties Ltd | Real estate | 2024 |
| Kingsley Staj Limited | Wholesale & retail | 2022 |
| Kingsleys Property Solutions Limited | Construction | 2015 |
| Kingston Park Playgroup Ltd | Health & social care | 2025 |
| Kingswood Candle Company Ltd | Wholesale & retail | 2023 |
| Kingswood Civil Engineering Ltd | Construction | 2019 |
| Kingswood Financial Securities Limited | Real estate | 2025 |
| Kingswood Transport Management Ltd | Extraterritorial | 2025 |
| Kinjul Limited | Administrative & support | 2020 |
| Kinmech Limited | Professional & scientific | 2019 |
| Kinnens Caravans Ltd | Wholesale & retail | 2020 |
| Kinsey Mcbain Limited | Administrative & support | 2013 |
| Kiom Life Limited | Education | 2025 |
| KIP Entertainment Ltd | Arts & recreation | 2025 |
| Kiran Saldanha Ltd | Health & social care | 2012 |
| Kirby's Roofing (Widnes) Limited | Construction | 1999 |
| Kirbygate Associates Ltd | Other services | 2019 |
| Kirk Architectural Ltd | Professional & scientific | 2023 |
| Kirk Software Engineering Ltd | Information & communication | 2015 |
| Kirkby Advisory Limited | Professional & scientific | 2026 |
| Kirkham Medical & Aesthetics Ltd | Health & social care | 2018 |
| Kiro Developments Limited | Real estate | 2018 |
| Kirsty's Angels Ltd | Administrative & support | 2020 |
| KIS Design LLP | | 2014 |
| Kitchen Doctor North West Ltd | Construction | 2026 |
| Kitchen Mavericks Ltd | Hospitality | 2023 |
| Kitchensafe UK Limited | Administrative & support | 2008 |
| Kitchenways Ltd | Wholesale & retail | 2015 |
| Kitson Gemini Limited | Information & communication | 2022 |
| Kitten Fortress Ltd | Information & communication | 2021 |
| KIW Energy Solutions Limited | Other services | 2025 |
| Kiwi Coaching Enterprises Ltd | Arts & recreation | 2020 |
| Kiwi Coaching Personal Training Ltd | Arts & recreation | 2020 |
| Kiwi Doors Ltd | Construction | 2022 |
| Kixx Manchester East Ltd | Education | 2022 |
| Kixx Warrington Ltd | Education | 2022 |
| Kiyuki Limited | Information & communication | 2017 |
| KJ Controls Limited | Administrative & support | 2014 |
| KJ Housing Inc Ltd | Administrative & support | 2020 |
| KJ Stress-Fem Engineering Ltd | Administrative & support | 2022 |
| KJB Signalling Ltd | Administrative & support | 2025 |
| KJD Consultancy Limited | Other services | 2017 |
| KJD Enterprises Limited | Information & communication | 2016 |
| KJD Holdings Limited | Professional & scientific | 2015 |
| KJD Investment Property Limited | Real estate | 2022 |
| KJD Property LLP | | 2015 |
| KJE Financial Consultancy Ltd | Professional & scientific | 2017 |
| KJF Engineering Services Ltd | Administrative & support | 2025 |
| KJF Productions Limited | Agriculture & fishing | 2015 |
| KJG Property & Developments Ltd | Construction | 2024 |
| KJG Site Engineering Limited | Administrative & support | 2015 |
| KJM & Co. Trading Limited | Transport & logistics | 2020 |
| Kjmc Ltd | Hospitality | 2017 |
| KJR BIM Ltd | Professional & scientific | 2023 |
| KJS Grab and Go Ltd | Wholesale & retail | 2026 |
| KJS Group Ltd | Financial services | 2023 |