| JS Van Locks Limited | Wholesale & retail | 2026 |
| JSB (Derby) Limited | Construction | 2010 |
| JT Health & Safety Services Ltd | Professional & scientific | 2019 |
| Just Desserts Swad Ltd | Hospitality | 2025 |
| Just Direct Cremations Ltd | Other services | 2025 |
| Just Floor IT Limited | Other services | 2016 |
| JW Haulage and Hiab Services Ltd | Transport & logistics | 2026 |
| JW Towbars Ltd | Wholesale & retail | 2019 |
| JWA Technologies Ltd | Manufacturing | 2022 |
| Jypubs Ltd | Professional & scientific | 2025 |
| K & a Bespoke Developments Ltd | Real estate | 2025 |
| K & C Kids Cabin Ltd | Health & social care | 2016 |
| K Couriers Ltd | Transport & logistics | 2024 |
| K Peacock Estates Ltd | Real estate | 2026 |
| K Riley Autos Ltd | Wholesale & retail | 2025 |
| K Watterson Properties Ltd | Other services | 2013 |
| K&C Pubs & Bars Ltd | Hospitality | 2025 |
| K&N Scaffolding Limited | Construction | 2022 |
| K&W Property Rentals Limited | Real estate | 2024 |
| K-Mec Limited | Other services | 2018 |
| K. Borley & SON (Mini-Mix) Limited | Extraterritorial | 1988 |
| K. Borley and SON Limited | Construction | 1983 |
| K.H. Auto Centre Ltd | Wholesale & retail | 2012 |
| K1 Recovery & Transport Ltd | Transport & logistics | 2025 |
| K777 Limited | Information & communication | 2025 |
| Kaboom Heritage CIC | Education | 2026 |
| Kang 3 Limited | Hospitality | 2023 |
| Kang 4 Limited | Wholesale & retail | 2013 |
| Kang Leisure (Ashby) Limited | Hospitality | 2022 |
| Kang Leisure Ashbourne Limited | Hospitality | 2025 |
| Kang Midlands Properties Limited | Real estate | 2026 |
| Kavox Group Ltd | Hospitality | 2022 |
| KB Therapy Services Ltd | Health & social care | 2023 |
| KCR Assist Ltd | Construction | 2026 |
| KCR Transport and Removals Limited | Transport & logistics | 2019 |
| KDB Cooling Ltd | Construction | 2021 |
| KED Hair Limited | Other services | 2014 |
| Kellams Plant Services Ltd | Professional & scientific | 2021 |
| Kennerley Services Ltd | Construction | 2017 |
| Kestrelqas Ltd | Professional & scientific | 2017 |
| Keystone Care Properties Ltd | Real estate | 2017 |
| Keystone Numismatics Limited | Wholesale & retail | 2012 |
| Keystone OPS Group Ltd | Administrative & support | 2023 |
| KG Fabrications Ltd | Professional & scientific | 2025 |
| Khan Consultants Ltd. | Information & communication | 1994 |
| Kibworth Residents Management Company Limited | Households | 2017 |
| Kids R US OUT of School Care Ltd | Health & social care | 2024 |
| Kimble's Music & Movement Limited | Education | 2007 |
| Kindhome Services Ltd | Other services | 2025 |
| Kinetic Support Partners Ltd | Health & social care | 2020 |
| Kings Detailing Limited | Construction | 2025 |
| Kingsbury Close (Leamington Spa) Management Company Limited | Households | 2023 |
| Kingsmead Homes Limited | Construction | 2016 |
| Kingspride Properties Limited | Professional & scientific | 1995 |
| Kingswalk Properties Ltd | Real estate | 2022 |
| Kingsway Construction Ltd | Construction | 2023 |
| Kirkby & Shaw Ltd | Construction | 2025 |
| Kirkby Holding Group Ltd | Financial services | 2026 |
| Kirkvale Limited | Transport & logistics | 1987 |
| Kitchen Appliance Retail Ltd | Wholesale & retail | 2022 |
| Kiwiana Interiors Limited | Wholesale & retail | 2015 |
| KJ Upholstery Ltd | Manufacturing | 2018 |
| KJC Brickwork Ltd | Construction | 2025 |
| KJK Holdings Ltd. | Financial services | 2026 |
| KJP Transport Solutions Ltd | Transport & logistics | 2019 |
| Kj’S Luxe Lounge Ltd | Hospitality | 2026 |
| KK 88 Limited | Hospitality | 2023 |
| Klas Events Ltd | Administrative & support | 2024 |
| KMK Electrical Limited | Construction | 2009 |
| Knightley Holdings Limited | Professional & scientific | 2016 |
| Knightwood (Rosliston) Management Company Limited | Households | 2018 |
| KO Academy Ltd | Arts & recreation | 2022 |
| KO Sports Academy Limited | Education | 2025 |
| Koala Kids Club Ltd | Health & social care | 2020 |
| Kootie Ltd | Hospitality | 2022 |
| Koretrix Engineering Ltd | Construction | 2011 |
| Koretrix Freight Group Ltd | Transport & logistics | 2020 |
| Koretrix Hospitality Ltd. | Wholesale & retail | 2023 |
| Koretrix Solutions Ltd | Administrative & support | 2024 |
| Koretrix Surfaces Limited | Construction | 2002 |
| Koyera Limited | Wholesale & retail | 2024 |
| Kravehouse Ltd | Hospitality | 2025 |
| KRC Media Ltd | Information & communication | 2026 |
| Kryshgv Transport Ltd | Transport & logistics | 2024 |
| KS131 Ltd | Transport & logistics | 2025 |
| KTM Electrical Services Limited | Construction | 2014 |
| Kudize Media Limited | Information & communication | 2016 |
| Kufara Trading Limited | Wholesale & retail | 2025 |
| Kumu Sport Limited | Information & communication | 2025 |
| L & K Property Limited | Real estate | 2019 |
| L and P Services Ltd | Transport & logistics | 2022 |
| L Clarke Property Services Limited | Real estate | 2019 |
| L H Support Services Limited | Administrative & support | 2024 |
| L J Conway Property Investments Limited | Real estate | 2021 |
| L S Support Services Limited | Administrative & support | 2024 |
| L&L Properties Derbyshire Limited | Real estate | 2025 |
| L.G.T. Limited | Manufacturing | 2016 |
| L.H. Installations Ltd | Construction | 2019 |
| L.I Bars Limited | Hospitality | 2026 |
| LA Belle Aesthetics 2018 Ltd | Health & social care | 2022 |