| Kirk and Co Consulting Ltd | Information & communication | 2025 |
| Kirkby Cross Hand Car Wash Ltd | Administrative & support | 2025 |
| Kirkland & Wright Limited | Professional & scientific | 2013 |
| Kirkland Electrical Limited | Construction | 2008 |
| Kirpa Homecare Services Limited | Health & social care | 2026 |
| Kirpa Realty Limited | Real estate | 2025 |
| Kirto Ltd | Health & social care | 2023 |
| Kismet Canine Ltd | Agriculture & fishing | 2025 |
| KIT Care Limited | Health & social care | 2014 |
| Kitchen Bathroom Fit Ltd | Construction | 2018 |
| Kitchnhome Ltd | Wholesale & retail | 2025 |
| Kitequest Limited | Professional & scientific | 2007 |
| Kitow Limited | Construction | 2022 |
| Kitty Sense Limited | Wholesale & retail | 2024 |
| Kixx Burton Ltd | Education | 2021 |
| KJ Auto Solutions Ltd | Wholesale & retail | 2023 |
| KJ Data Management Ltd | Information & communication | 2021 |
| KJ Sims Ltd | Professional & scientific | 2018 |
| KJB Real Estate Ltd | Real estate | 2024 |
| KJL Facilities Management Limited | Administrative & support | 2017 |
| KJL Flooring Ltd | Construction | 2011 |
| KJL Productions Ltd | Arts & recreation | 2023 |
| KJM Consultancy Ltd | Professional & scientific | 2015 |
| Kjmr Property Solutions Ltd | Real estate | 2020 |
| KK Cars Derby Ltd | Wholesale & retail | 2025 |
| KK Derby Limited | Hospitality | 2016 |
| KK Elliot Properties Limited | Real estate | 2026 |
| KK Luxe Holdings Ltd | Financial services | 2024 |
| KKF Engineering Ltd | Professional & scientific | 2018 |
| Kkth Limited | Real estate | 2018 |
| KL Autohouse Ltd | Wholesale & retail | 2022 |
| KL Food Craft Ltd | Hospitality | 2024 |
| Klad Properties Ltd | Real estate | 2026 |
| Klaine Rail Technologies Ltd | Manufacturing | 2026 |
| Klan G Limited | Transport & logistics | 2010 |
| Klas Strom Limited | Professional & scientific | 2010 |
| Klass Hair Ltd | Other services | 2024 |
| Klean and Kind Ltd | Manufacturing | 2020 |
| Klean Enterprises Ltd | Administrative & support | 2025 |
| Klear + Move Limited | Water & waste | 2025 |
| Kleed Capital Holdings Ltd | Financial services | 2025 |
| KLG Thermal Insulation Specialists Ltd | Professional & scientific | 2016 |
| KLH Business Consultancy Limited | Extraterritorial | 1997 |
| KLH Electrical Limited | Construction | 2021 |
| KLH Finance Ltd | Financial services | 1998 |
| KLH Marketing Limited | Administrative & support | 2003 |
| Klhc Associates Ltd | Information & communication | 2022 |
| Klhg (Nottinghamshire) Ltd | Hospitality | 2018 |
| Klimczak Limited | Health & social care | 2007 |
| Klio Properties Ltd | Real estate | 2024 |
| KLM Car & Commercials Ltd | Wholesale & retail | 2020 |
| Klmg Food Group Ltd | Hospitality | 2022 |
| Kloe's Coffee Ltd | Manufacturing | 2026 |
| Klouto Ltd | Professional & scientific | 2025 |
| KLP Lettings Ltd | Real estate | 2024 |
| Klpg (Nottinghamshire) Ltd | Hospitality | 2018 |
| KLR Civils Ltd | Construction | 2025 |
| KLS Property Limited | Real estate | 2023 |
| KM Reliable Repairs Ltd | Wholesale & retail | 2023 |
| KME Engineering Limited | Professional & scientific | 2016 |
| KMG Property Holdings Ltd | Real estate | 2020 |
| KML Recruitment Ltd | Transport & logistics | 2016 |
| Kmmd Ltd | Hospitality | 2025 |
| Kmpd Holding Limited | Financial services | 2024 |
| KMS Stoke Wholesale Tyre Limited | Manufacturing | 2025 |
| KMS Wholesale Tyres Limited | Wholesale & retail | 2019 |
| KNF Logistics Ltd | Transport & logistics | 2025 |
| KNG Collateral Limited | Households | 2023 |
| Knibb Gormezano Investments Limited | Real estate | 2021 |
| Knibb Gormezano Limited | Professional & scientific | 1999 |
| Knight Ceilings & Co Ltd | Construction | 2018 |
| Knight Cleaning (Derby) Limited | Administrative & support | 2015 |
| Knighton Janitorial Limited | Other services | 2016 |
| Knighton Transport Limited | Transport & logistics | 2017 |
| Knights Chase (Woodcock Way) Management Company Limited | Households | 2017 |
| Knights Manor (Copmanthorpe) Residents Management Company Limited | Households | 2025 |
| Knightsbridge Housing Limited | Real estate | 2025 |
| Knightsbridge Investments Corporation Limited | Wholesale & retail | 2025 |
| Knightsbuild Ltd | Construction | 2023 |
| Knightsford Rail Consulting Limited | Professional & scientific | 2017 |
| Knightstone Group Ltd | Construction | 2023 |
| Knighttrooper Limited | Financial services | 2023 |
| Knitline Machines Limited | Wholesale & retail | 2025 |
| KNJ Holdings Limited | Financial services | 2020 |
| Knoll Holdings Limited | Professional & scientific | 2022 |
| Knowle Engineering Ltd | Construction | 2016 |
| KNS Civils Ltd | Construction | 2025 |
| KO Flooring Contractors Ltd | Construction | 2021 |
| KOA Construction Ltd | Construction | 2025 |
| Koalaa Digital Ltd | Information & communication | 2022 |
| Kofostitches Ltd | Wholesale & retail | 2024 |
| Kohli Transport Company Ltd | Transport & logistics | 2019 |
| Koko Corporation Limited | Financial services | 2012 |
| Kokojay Limited | Health & social care | 2019 |
| Kolhe Limited | Health & social care | 2011 |
| Kollo Health Ltd. | Wholesale & retail | 2019 |
| KOM Services (UK) Ltd | Professional & scientific | 2014 |
| Kombat Kinetics Ltd | Arts & recreation | 2011 |
| Konkal Building Services Ltd | Construction | 2012 |
| Konkal Properties Ltd | Real estate | 2024 |