| Jboss Group Ltd | Wholesale & retail | 2021 |
| Jcpp Ltd | Real estate | 2021 |
| JCS Engineering Contracts Limited | Professional & scientific | 2010 |
| JD Blasting & Painting Services Limited | Manufacturing | 2011 |
| Jddr Ltd | Real estate | 2004 |
| JDH (Derbyshire) Construction Limited | Construction | 2019 |
| Jenny East Mrcvs Ltd | Professional & scientific | 2026 |
| Jestor Investments Limited | Extraterritorial | 1986 |
| Jewett Carpentry Ltd | Manufacturing | 2021 |
| JH Business Management Solutions Ltd | Professional & scientific | 2020 |
| JH Rural Enterprises Ltd | Wholesale & retail | 2023 |
| Jigsaw Hospitality Ltd | Hospitality | 2024 |
| JJ Taverns Ltd | Hospitality | 2023 |
| JLP Property Partners Ltd | Real estate | 2025 |
| JM Chiropractic Ltd | Health & social care | 2024 |
| JN Technical Services Ltd | Construction | 2023 |
| JO Smith Consultancy Ltd | Professional & scientific | 2021 |
| John Ralfe Consulting Limited | Financial services | 2003 |
| Jones Joiners Limited | Construction | 2019 |
| Jorth Consult Limited | Agriculture & fishing | 2001 |
| Journey Campers Ltd | Administrative & support | 2022 |
| JSW Properties (Fire) Ltd | Construction | 2025 |
| JT England Limited | Manufacturing | 2023 |
| Jtblake Management Consultancy Limited | Professional & scientific | 2023 |
| JTS Fabrications Limited | Manufacturing | 2022 |
| JTW Burton Contracting Ltd | Agriculture & fishing | 2013 |
| Julie Small Locum Services Limited | Wholesale & retail | 2005 |
| Juma Communications Limited | Manufacturing | 2012 |
| Juma Technologies Limited | Manufacturing | 2026 |
| Just Chillin Trailers Ltd | Administrative & support | 2025 |
| Juwel, HAF & Hyde Limited | Financial services | 2021 |
| Jvjr Homes Ltd | Real estate | 2022 |
| JWG Consultancy Ltd | Professional & scientific | 2022 |
| JWH Joinery Limited | Construction | 2014 |
| K H Woodfield Ltd | Wholesale & retail | 2025 |
| KAD Civils Limited | Administrative & support | 2018 |
| Kainai Designs Ltd | Wholesale & retail | 2025 |
| Kalro Enterprises Limited | Real estate | 2000 |
| Kama Wash&Go Ltd | Administrative & support | 2024 |
| Kanko Limited | Wholesale & retail | 1998 |
| Katoro Refinery Limited | Mining & quarrying | 2023 |
| KCR Interim Ltd | Professional & scientific | 2026 |
| KD Medicolegal Services Ltd | Health & social care | 2015 |
| Keate Property & Trading Co. Limited | Real estate | 1978 |
| Keating Global Ltd | Construction | 2024 |
| Keating Projects Ltd | Construction | 2019 |
| Keeling & Ricketts Developments Ltd | Construction | 2024 |
| Kenton Window Cleaning Limited | Administrative & support | 2024 |
| Kentsford Designs Limited | Administrative & support | 2007 |
| Kete Consulting Ltd | Professional & scientific | 2024 |
| Kimmy's Cupboard Ltd | Wholesale & retail | 2025 |
| Kinoulton Executive Homes Limited | Construction | 2023 |
| Kipling Stone Masonry Restoration Ltd | Manufacturing | 2021 |
| Kira Supplies Limited | Wholesale & retail | 2003 |
| Kirkview Developments Ltd | Real estate | 2020 |
| KIT4DOGS Ltd | Other services | 2017 |
| Kitley Engineering Limited | Professional & scientific | 2008 |
| KJL Education Services Ltd | Education | 2019 |
| KJP Developments Ltd | Construction | 2020 |
| Kniveton Wood Estate Limited | Real estate | 2025 |
| Kniveton Wood Farm Limited | Financial services | 2023 |
| Knnx Limited | Wholesale & retail | 2014 |
| Kogan Communications Limited | Wholesale & retail | 1999 |
| KPH Consulting Ltd | Information & communication | 2023 |
| KTL Civil Engineering Ltd | Construction | 2018 |
| KTL Developments Ltd | Extraterritorial | 2024 |
| KVM UK Ltd | Administrative & support | 1983 |
| Kypros Fish Ltd | Hospitality | 2025 |
| Kyvor Ltd | Wholesale & retail | 2026 |
| L J Blackwell and SON Ltd | Administrative & support | 2016 |
| L.T. Business Management Ltd | Administrative & support | 2021 |
| L2B Property Investments Limited | Real estate | 2013 |
| Ladder Media Ltd | Information & communication | 2008 |
| Lakeside Meadow Limited | Hospitality | 2017 |
| Lakin Send Services Ltd | Professional & scientific | 2021 |
| Lamplight Restaurant Limited | Hospitality | 2002 |
| Land Partners (England) Limited | Real estate | 1998 |
| Landline Telecom Communications Ltd | Construction | 2016 |
| Landofrugs Online Ltd | Wholesale & retail | 2012 |
| Landscape Maintenance Services Limited | Administrative & support | 2007 |
| Lane - END Building Services Limited | Construction | 2016 |
| Lane END Farming Ltd | Agriculture & fishing | 2013 |
| Langham Park Developments Limited | Construction | 2004 |
| Langley Brook Cars of Derbyshire Limited | Wholesale & retail | 2022 |
| Language Schools Abroad Limited | Education | 2016 |
| Lauren @ Chic Ltd | Wholesale & retail | 2022 |
| Lawlock Building Restoration Limited | Construction | 2015 |
| Lawlock Estates Limited | Administrative & support | 2008 |
| LD Contractors Ltd | Professional & scientific | 2025 |
| Leatherbritches Brewery Limited | Manufacturing | 2007 |
| Leek Mill Investments Limited | Professional & scientific | 2000 |
| Lees Real Estate Ltd | Real estate | 2017 |
| Legal Equitable and Financial Limited | Financial services | 2018 |
| Legaleyes Limited | Professional & scientific | 2001 |
| Leigh Brown Engineering Services Limited | Professional & scientific | 2014 |
| Leisurestock Ltd | Professional & scientific | 2025 |
| Leonine Associates Limited | Real estate | 2008 |
| Leonine Services Limited | Information & communication | 2007 |
| Lester Lowe Limited | Wholesale & retail | 2001 |
| Leston Property Investments Ltd | Real estate | 2019 |