| K Mclaughlin Ceilings and Partitions Limited | Construction | 2004 |
| K P Taylor Limited | Administrative & support | 2008 |
| K S Lift Trucks Limited | Manufacturing | 2014 |
| K T Boutique Limited | Wholesale & retail | 2021 |
| K Trucking Ltd | Transport & logistics | 2022 |
| K Wagstaff & Sons Limited | Construction | 2002 |
| K&J (Discounts) Limited | Other services | 2012 |
| K&J Group Ltd | Wholesale & retail | 2014 |
| K&J Manufacturing Limited | Manufacturing | 2017 |
| K&S Construction Ltd | Construction | 2012 |
| K&T Project Solutions Ltd | Construction | 2020 |
| K-Leigh Solutions Limited | Real estate | 2018 |
| K. Darlington & SON Limited | Construction | 2000 |
| K.J. Ashurst Construction Limited | Construction | 2011 |
| K1AT Consultancy Limited | Information & communication | 2015 |
| K3 Property Investments Limited | Real estate | 2015 |
| Kaam Pharma Limited | Wholesale & retail | 2000 |
| Kaashphool Ltd | Other services | 2013 |
| Kabadiya & Co Ltd | Professional & scientific | 2012 |
| Kaer Consulting Ltd | Professional & scientific | 2024 |
| Kaixin Kaixin Ltd | Hospitality | 2026 |
| KAM Sing Limited | Hospitality | 2014 |
| Kane Property Management Ltd | Real estate | 2023 |
| Kanzo Care Limited | Wholesale & retail | 2022 |
| KAR Eyecare Ltd | Financial services | 2022 |
| KAR Restaurants Limited | Hospitality | 2021 |
| Kara's Kitchen Chorley Ltd | Hospitality | 2024 |
| Karen Fingerhut Solutions Ltd | Information & communication | 2007 |
| Karic Investments Ltd | Real estate | 2020 |
| Karl Yates Ltd | Transport & logistics | 2026 |
| Karla's Mechanical Ltd | Construction | 2016 |
| Karna Transport Ltd | Transport & logistics | 2025 |
| Kartiq Motorsport Ltd | Information & communication | 2025 |
| Kartwise Pro Ltd | Information & communication | 2026 |
| Kashan Ltd | Wholesale & retail | 2019 |
| Kashan Properties Ltd | Real estate | 2022 |
| Kasl Precision Limited | Professional & scientific | 2026 |
| Kataholos Limited | Professional & scientific | 2018 |
| Kaths Kitchen Limited | Hospitality | 2019 |
| Katz Couriers Limited | Transport & logistics | 2014 |
| Kavern Club Bury Limited | Hospitality | 2019 |
| Kawa Coffee & Wine Bar Ltd | Hospitality | 2020 |
| KAY LAM Limited | Health & social care | 2023 |
| Kaye Livestock Limited | Agriculture & fishing | 2009 |
| KBR Consultancy Limited | Professional & scientific | 2021 |
| KC Barrier Services Ltd | Construction | 2025 |
| KC Dale Construction Limited | Construction | 2022 |
| KC Investments NW Limited | Other services | 2023 |
| KC Properties (NW) Ltd | Real estate | 2019 |
| KD Barbers Limited | Other services | 2025 |
| Kdah Ltd | Real estate | 2024 |
| KDI Motors Limited | Wholesale & retail | 2003 |
| Kdjackson Ltd | Hospitality | 2024 |
| KDP Groundworks Limited | Construction | 2020 |
| KDR Electrical Limited | Construction | 2019 |
| Keating Design Ltd | Professional & scientific | 2023 |
| Keekco Ltd | Construction | 2006 |
| Keep Snap Limited | Wholesale & retail | 2025 |
| Keiron Fisher Ec&I Ltd | Professional & scientific | 2021 |
| Keith Mason Wealth Management Limited | Professional & scientific | 2018 |
| Kellerplan Ltd | Professional & scientific | 2018 |
| Kelly and Richardson Limited | Administrative & support | 2009 |
| KEM Mill Executive (MGT Co) Limited | Households | 2022 |
| Kemiod Ltd | Health & social care | 2023 |
| KEN Smith Roofing (Bolton) Limited | Construction | 2024 |
| Kenneth Hodson Limited | | 1972 |
| Kenny's Motor Services Ltd | Professional & scientific | 2014 |
| Kenpro Limited | Health & social care | 2017 |
| Kensington Consulting Limited | Administrative & support | 2006 |
| Kensington Food & Wine Limited | Wholesale & retail | 2012 |
| Kensington Palace Investments Limited | Real estate | 2019 |
| Kenyon Properties UK Ltd | Real estate | 2020 |
| Kenyten Stone Limited | Real estate | 2019 |
| Kerax (Chorley) Limited | Professional & scientific | 2006 |
| Kerax Holdings Limited | Financial services | 2018 |
| Kerax Limited | Manufacturing | 2003 |
| Kernow Air Limited | Administrative & support | 2000 |
| Kernow Motors Limited | Wholesale & retail | 2018 |
| Kerr Capital Developments Limited | Construction | 2019 |
| Kerr Capital SPV 01 Limited | Construction | 2021 |
| Kerr Capital SPV 02 Limited | Real estate | 2024 |
| Kerr Capital SPV03 Limited | Construction | 2025 |
| Kershaw Builders NW Limited | Construction | 2020 |
| Ketching & Ferrying Limited | Financial services | 2019 |
| Kevills Limited | Professional & scientific | 2024 |
| Kevs Kegs Limited | Wholesale & retail | 2024 |
| Keways Ventures Limited | Real estate | 2021 |
| Key 103 Limited | Extraterritorial | 2025 |
| Key Group UK Ltd | Wholesale & retail | 2023 |
| Keyshoot Group Ltd | Financial services | 2026 |
| Keyshoot Limited | Information & communication | 2026 |
| Keyword Hunters Ltd | Information & communication | 2026 |
| KG Automotive Ltd | Wholesale & retail | 2017 |
| KG Site Loaders Limited | Administrative & support | 2017 |
| Kgaz Limited | Real estate | 2026 |
| KGL Building Services Ltd | Construction | 2017 |
| Kgnfonfix Ltd | Other services | 2019 |
| Khadijah Desai Ltd | Hospitality | 2025 |
| Khalaf Textile Ltd | Wholesale & retail | 2017 |
| Khan Haulage Ltd | Transport & logistics | 2018 |