| Jba-Design Ltd | Professional & scientific | 2023 |
| JC Barber Care Ltd | Wholesale & retail | 2020 |
| Jcade Limited | Wholesale & retail | 2016 |
| JCJ Support Solutions Ltd | Health & social care | 2026 |
| JD Accounting Insights Ltd | Professional & scientific | 2025 |
| JEG Systems Ltd | Professional & scientific | 2013 |
| Jenko Consultancy Ltd | Health & social care | 2023 |
| Jennifer Podd Ltd | Health & social care | 2019 |
| Jessicare Limited | Health & social care | 2022 |
| Jessico Limited | Real estate | 2014 |
| Jewellery Patisserie Ltd | Manufacturing | 2022 |
| JG Engineering (Midlands) Ltd | Professional & scientific | 2018 |
| Jigsaw UK Development Limited | Construction | 2023 |
| Jjdc Enterprises Limited | Information & communication | 2018 |
| Jkam Ltd | Construction | 2019 |
| JLH Tree & Hedge Services Ltd | Agriculture & fishing | 2026 |
| JLS Management Ltd | Professional & scientific | 2023 |
| JLT Enterprise Ltd | Professional & scientific | 2025 |
| JM67 Limited | Construction | 2022 |
| JME Site Services Limited | Construction | 2008 |
| JMK Property Management Limited | Real estate | 2022 |
| JML Skye's Limited | Hospitality | 2025 |
| JO Brocklehurst HR Limited | Administrative & support | 2016 |
| John Brownsey Limited | Professional & scientific | 2006 |
| John Layton Associates Limited | Real estate | 2005 |
| John O'Sullivan Contractors Limited | Construction | 2004 |
| John Tams Limited | Arts & recreation | 2006 |
| Johnsons (Chopwell) Limited | Mining & quarrying | 1941 |
| Jojacha Limited | Wholesale & retail | 2013 |
| Jollie.Us Ltd | Arts & recreation | 2021 |
| Jono Steel Butchers Ltd | Wholesale & retail | 2024 |
| Jord Reviews Ltd | Wholesale & retail | 2025 |
| Josh Jones Academy Ltd | Arts & recreation | 2022 |
| JPB Property Solutions Ltd | Construction | 2021 |
| JPG Consulting Limited | Professional & scientific | 2020 |
| JPG Engineering Services (UK) Ltd | Manufacturing | 2016 |
| JS Aesthetics Clinic Ltd | Other services | 2023 |
| JS Property Management Ltd | Real estate | 2013 |
| JT Compliance & Logistics Consulting Ltd | Professional & scientific | 2022 |
| JTE (Duffield) Ltd | Administrative & support | 2010 |
| Judds Farming and Plant Hire Ltd | Agriculture & fishing | 2026 |
| Jurismind Ltd. | Extraterritorial | 2024 |
| Just Great Media Ltd | Information & communication | 2026 |
| JUST2EASY Limited | Information & communication | 2001 |
| Jvlsr Ltd | Real estate | 2024 |
| JVR Property Services Limited | Households | 2024 |
| JWT Groundworks Limited | Construction | 2012 |
| K & B Investments Limited | Construction | 2026 |
| K B Reinforcements (Northern) Limited | Construction | 1980 |
| K Oakey Builders Limited | Construction | 2009 |
| K R Brickwork Limited | Construction | 2012 |
| K Smithurst Building Contractors Limited | Construction | 2002 |
| K&Adproperties Ltd | Real estate | 2024 |
| K.C. Wigley & Co. Limited | Manufacturing | 1983 |
| K4 Vehicle Maintenance Ltd | Wholesale & retail | 2020 |
| Kabbani & Smith Property Services Limited | Real estate | 2023 |
| Kale and Corn Ltd | Wholesale & retail | 2021 |
| Kash Raju Ltd | Administrative & support | 2017 |
| Kate B Ltd | Extraterritorial | 2012 |
| Katie Abey Design Ltd | Arts & recreation | 2016 |
| Katie Abey Retail Limited | Wholesale & retail | 2018 |
| KAY9 to 5 Limited | Extraterritorial | 2018 |
| KB Property Investments Limited | Real estate | 2011 |
| KB Steel Holdings Limited | Manufacturing | 1967 |
| KCD (Derby) Limited | Other services | 2023 |
| KDA Productions Limited | Information & communication | 2024 |
| KDC Property Ltd | Real estate | 2024 |
| KDM Consultancy Services Ltd | Construction | 2020 |
| Kedleston Investments Limited | Construction | 2021 |
| Kedleston Safety Ltd | Professional & scientific | 2017 |
| Kedzink Ltd | Other services | 2023 |
| Kelsey Brickwork Limited | Construction | 2009 |
| Kelsey Family CIC | Health & social care | 2022 |
| Kent Consulting and Contracting Services Limited | Professional & scientific | 2015 |
| Kenworthy Holdings Limited | Financial services | 2026 |
| Kevin W Stone Limited | Other services | 2010 |
| Kevin Walker Loft Space Specialist Ltd | Construction | 2002 |
| Key Building Finishes Limited | Construction | 2000 |
| Key Joinery Limited | Construction | 1984 |
| Key Property Solutions Limited | Construction | 1976 |
| Keyclad Limited | Construction | 1989 |
| Keystone Developments (Building Derby) Ltd | Construction | 2015 |
| KFG Consultants Limited | Financial services | 2012 |
| KHJ Aesthetics Limited | Other services | 2026 |
| Kickstart Youth Academy Ltd | Education | 2019 |
| Kidology Limited | Extraterritorial | 2020 |
| Kilbourne Court Close Management Company Ltd | Households | 2018 |
| Kilburn Hall Estate Management Company Limited | Households | 2000 |
| Kinder Scout Ltd | Information & communication | 2011 |
| Kinexa Limited | Information & communication | 2017 |
| Kingfisher Business Solutions Limited | Professional & scientific | 2011 |
| Kingpin Catering Ltd | Hospitality | 2017 |
| Kingsman Consulting Ltd | Professional & scientific | 2020 |
| Kingsman Property Services Ltd | Construction | 2020 |
| Klad Limited | Wholesale & retail | 2006 |
| Klassic Catering Limited | Hospitality | 2013 |
| KM Solutions Consulting Ltd | Professional & scientific | 2021 |
| Knight Consultancy Services Limited | Professional & scientific | 2025 |
| Knight Interiors Limited | Construction | 2007 |
| Knight Travel Ltd | Transport & logistics | 2009 |