| Jordan Carrington Bathrooms & Tiles Ltd | Construction | 2023 |
| Jowitt Contracting Limited | Construction | 2017 |
| JP Squared Limited | Construction | 2025 |
| JPR Farm Direct Limited | Wholesale & retail | 2001 |
| JS Cottages Ltd | Real estate | 2024 |
| Jspi Ltd | Real estate | 1999 |
| JT Rolling Stock Maintenance Ltd | Manufacturing | 2022 |
| Just A.S.K Courier Services Ltd | Transport & logistics | 2025 |
| Just Dogs Cheshire Limited | Hospitality | 2016 |
| Just Inn Limited | Hospitality | 2003 |
| Justin Fleming Limited | Professional & scientific | 2011 |
| Jwehoward Limited | Manufacturing | 2021 |
| K & M Auto Care Ltd | Wholesale & retail | 2019 |
| K L Grant Consulting Limited | Professional & scientific | 2012 |
| K W Tiling & Bathrooms Limited | Construction | 2021 |
| Kapetil (Buxton) Limited | Other services | 2006 |
| Kapetil (High Peak) Limited | Other services | 2002 |
| Kapetil Investments Ltd | Administrative & support | 2017 |
| Kapetil Limited | Other services | 2006 |
| Karaoke UK Ltd. | Wholesale & retail | 1993 |
| Kate Brindley Limited | Professional & scientific | 2021 |
| Kays Engineers Ltd | Manufacturing | 2003 |
| KBS Oakes Accountants Ltd | Professional & scientific | 2015 |
| Kdbc Parcels Ltd | Transport & logistics | 2019 |
| Kdlbb Management Ltd | Hospitality | 2021 |
| Kenny's Karavan Limited | Hospitality | 2021 |
| Keratin Specialist Club Limited | Other services | 2019 |
| Kerb Appeal Investments (UK) Limited | Real estate | 2020 |
| Kerb Appeal Property Services (UK) Limited | Administrative & support | 2020 |
| Key Property Apps Ltd | Information & communication | 2026 |
| Key Removals & Clearances Ltd | Transport & logistics | 2019 |
| Keycorp Limited | Professional & scientific | 1999 |
| Keycorp Property Limited | Real estate | 2014 |
| Keypon Limited | Water & waste | 2003 |
| Keystone Worktops Ltd | Manufacturing | 2025 |
| KH Distributions Ltd | Wholesale & retail | 2026 |
| KHB Enterprises Ltd | Information & communication | 2025 |
| Kidpa Limited | Real estate | 2020 |
| Kiln Residential Management Company Limited | Households | 2020 |
| Kinder Peak Insurance Services Limited | Financial services | 2003 |
| Kings Langley Engineering Company Limited | Manufacturing | 1938 |
| Kinlee Homes (Cranford) Management Limited | Households | 1986 |
| Kinnaird Gardens Management Company Limited | Households | 2011 |
| Klck Ltd | Real estate | 2023 |
| KN Squared Consultants Limited | Professional & scientific | 2022 |
| Kniffy Limited | Wholesale & retail | 2025 |
| Knightley Developments Limited | Construction | 2015 |
| Knox & Payne Consulting Ltd | Professional & scientific | 2024 |
| KP & RA Storer Ltd | Professional & scientific | 2011 |
| Kpennai Limited | Information & communication | 2025 |
| Krantechnik Ltd | Construction | 2002 |
| KSH Farm Limited | Other services | 2014 |
| KSH Plant Limited | Wholesale & retail | 2015 |
| Kwik MIX UK Ltd | Manufacturing | 2024 |
| L D Transport Services Limited | Transport & logistics | 2003 |
| L P Maintenance Limited | Construction | 2022 |
| L S F Developments Limited | Real estate | 2018 |
| L&L Gardens Limited | Administrative & support | 2013 |
| L.C. Switchgear Limited | Manufacturing | 1999 |
| L.C.S. Holdings Limited | Professional & scientific | 2003 |
| LA Brasserie DE LA Cour Limited | Hospitality | 2010 |
| LA Gaby Ltd | Hospitality | 2021 |
| Laen London Ltd | Wholesale & retail | 2025 |
| Lahovska Studio Limited | Information & communication | 2026 |
| Laina Harris Consulting Limited | Professional & scientific | 2023 |
| Lake House Management Company Limited | Households | 2004 |
| Lande Design Studio Ltd | Professional & scientific | 2022 |
| Landscape Derbyshire Limited | Construction | 2025 |
| Lane END Farm Trust | Education | 2007 |
| Lathkill Coaches Limited | Extraterritorial | 2016 |
| Laura Hazle Consulting Limited | Other services | 2021 |
| Laura Timmins Design Ltd | Information & communication | 2023 |
| Lawn & Landscape Limited | Administrative & support | 2006 |
| Laycock (Holdings) Limited | Professional & scientific | 1998 |
| Laytons Accountants & Business Advisers Limited | Professional & scientific | 2021 |
| LDL Commercial Cleaning Ltd | Administrative & support | 2023 |
| LE Bar Brasserie Limited | Hospitality | 2025 |
| Leaden Boot Challenge Community Interest Company | Arts & recreation | 2023 |
| Leadout Project Limited | Professional & scientific | 2010 |
| Leah Property Holdings Ltd | Real estate | 2025 |
| Leander Architectural Ltd | Professional & scientific | 2022 |
| Lectus Limited | Real estate | 2017 |
| Legend Barber Buxton Ltd | Other services | 2024 |
| Lemcat Limited | Information & communication | 2021 |
| Leonard Teehan Ltd | Information & communication | 2014 |
| Leonardo Conservatories Limited | Extraterritorial | 2000 |
| Leonardo Windows & Conservatories Ltd | Extraterritorial | 2009 |
| Leonardo Windows Limited | Manufacturing | 2001 |
| Let's Talk Therapy Ltd | Health & social care | 2014 |
| Lewis Creations Limited | Arts & recreation | 2023 |
| LFJ Investments Ltd | Manufacturing | 2007 |
| LGC86 Holdings Limited | Financial services | 2025 |
| Lhoist UK Limited | Manufacturing | 2000 |
| Liaison Limited | Professional & scientific | 2004 |
| Lightwood Dental Care Ltd | Health & social care | 2021 |
| Lightwood Garage (Buxton) Limited | Wholesale & retail | 1964 |
| Limers Ltd | Other services | 2024 |
| Limestone Court Management Company Limited | Households | 2018 |
| Lion B Pictures Limited | Information & communication | 2012 |
| Lion Hospitality Limited | Hospitality | 2011 |