| K L Franklin Limited | Professional & scientific | 2021 |
| K.E.M.S. Autos Limited | Wholesale & retail | 2003 |
| Kabashk Ltd | Hospitality | 2026 |
| Kalimbra Trading Limited | Manufacturing | 2019 |
| Kangaroo Digital Limited | Information & communication | 2018 |
| Kara Surgical Assistance Ltd | Health & social care | 2020 |
| Karl Allsop Groundworks Ltd | Construction | 2018 |
| Katie King & Co. Ltd | Professional & scientific | 2023 |
| Katrse Ltd | Real estate | 2026 |
| Kavanagh Engineering Ltd | Professional & scientific | 2019 |
| KBW Regeneration 1 Limited | Construction | 2018 |
| Kefi Cafe Ltd | Hospitality | 2021 |
| Ken's Mini Market Limited | Wholesale & retail | 2001 |
| Kennedy & James Property Holdings Ltd | Real estate | 2021 |
| Kennel Flatcharm Ltd | Agriculture & fishing | 2024 |
| Keptkleen Ltd | Other services | 2015 |
| Kevin Toft (Plumbing) Limited | Construction | 2003 |
| Kiddico Ltd | Wholesale & retail | 2024 |
| Kids Flourish Therapy Services Ltd | Extraterritorial | 2022 |
| Kidzplay Inc Limited | Hospitality | 2020 |
| Kikai Plants Ltd | Professional & scientific | 2021 |
| KIM Neville Limited | Education | 2015 |
| KIP Mcgrath Matlock LLP | | 2023 |
| Kirkgate Otley Management Company Limited | Hospitality | 2014 |
| Kirkland Training Limited | Administrative & support | 2017 |
| KLH Accountancy Ltd | Professional & scientific | 2021 |
| KM Healthcare Ltd | Administrative & support | 2025 |
| KN Communications Limited | Wholesale & retail | 2022 |
| Knight Electrical Services Limited | Construction | 2016 |
| Knowle House Management Company Limited | Real estate | 2019 |
| Koral Property Management Limited | Construction | 1994 |
| Kreative Psychologies Ltd | Professional & scientific | 2022 |
| KRF Projects Ltd | Professional & scientific | 2016 |
| Kuhn Interiors Ltd | Manufacturing | 2010 |
| Kumamiyo Limited | Information & communication | 2012 |
| Kursad Ltd | Hospitality | 2025 |
| KYA Tailoring and Fashion House Ltd | Other services | 2020 |
| L & C Property Maintenance and Management Limited | Real estate | 2025 |
| L Alarcon Hospitality Ltd | Hospitality | 2022 |
| L H Reeve (Beeley Valley) Partnership | | 1987 |
| L. Petts Stonemasons Limited | Construction | 2003 |
| L.T.A.C.C Ltd | Real estate | 2025 |
| Ladybird Pet Boutique Ltd | Wholesale & retail | 2021 |
| Ladygrove Mill Limited | Construction | 2010 |
| Lakes and Dales Project Planning Ltd | Professional & scientific | 2018 |
| Lambs Cakes & Bakes Ltd | Wholesale & retail | 2021 |
| Lamck Housing Ltd | Real estate | 2026 |
| Laminar Systems Limited | Information & communication | 1996 |
| Lana Luxe Stays Ltd | Real estate | 2025 |
| Lant Lane Limited | Wholesale & retail | 2004 |
| Laura's Yoga Club Ltd | Other services | 2023 |
| Laurelle Investments Limited | Real estate | 1989 |
| LE Mistral Ltd | Hospitality | 2025 |
| LEA Hall Functions Limited | Hospitality | 2014 |
| Leacroft Garage Limited | Wholesale & retail | 2003 |
| Leading Into the Fire Ltd | Information & communication | 2023 |
| Leashaw Brow Woods Limited | Agriculture & fishing | 2024 |
| Leawood Technology Limited | Professional & scientific | 2014 |
| Leci Construction Ltd | Construction | 2010 |
| Leclanche UK Ltd | Administrative & support | 2014 |
| Legacy Endeavours Ltd | Hospitality | 2025 |
| Leinster Inns Limited | Hospitality | 2019 |
| Lenbury House Limited | Financial services | 2025 |
| Leni's Fish Bar Ltd | Hospitality | 2026 |
| Leonardo's Lounge Limited | Wholesale & retail | 2019 |
| Leonardo's Wholesale Limited | Wholesale & retail | 2019 |
| Leonardo’S World Ltd | Other services | 2017 |
| Lewis Shepperson Limited | Real estate | 1957 |
| LFB Civils Ltd | Construction | 2026 |
| LH Matlock Limited | Construction | 2025 |
| Life Church Matlock Ltd | Other services | 2013 |
| Lifepsychol Limited | Information & communication | 2020 |
| Lifting & Training Solutions Limited | Construction | 2016 |
| Light ARC Studio Ltd | Information & communication | 2013 |
| Lime Forge Consultancy Limited | Information & communication | 2015 |
| Limegrove Dental Care Ltd | Health & social care | 2012 |
| Limehouse Property Services Ltd | Construction | 2009 |
| Limetree Music Centre Ltd | Information & communication | 2016 |
| LIT Fiya Ltd | Wholesale & retail | 2018 |
| Little Canyon Printworks CIC | Manufacturing | 2018 |
| Little Miss London Ltd | Wholesale & retail | 2015 |
| Littlepixel Design Limited | Professional & scientific | 2007 |
| Lizzie Mullaney's Signature Stays Limited | Financial services | 2025 |
| LMG Consult Ltd | Professional & scientific | 2014 |
| Lmke Consulting Limited | Professional & scientific | 2017 |
| LMS Membership Solutions Ltd | Information & communication | 2013 |
| LMS Social Work Services Ltd | Health & social care | 2012 |
| Lock Pizza Ltd | Hospitality | 2021 |
| Lodge Environmental Solutions Limited | Administrative & support | 1995 |
| Lodge Farm Estates Limited | Real estate | 2006 |
| Loft Entertainment Ltd | Hospitality | 2014 |
| Lomas FLK Limited | Construction | 2024 |
| London House Change Management Ltd | Professional & scientific | 2025 |
| Long Neck Limited | Professional & scientific | 2022 |
| Longacre Property Holdings Ltd | Real estate | 2024 |
| Longbow Consulting Ltd | Construction | 2003 |
| Longcliffe Group Limited | Professional & scientific | 1996 |
| Longcliffe Industrial Minerals Limited | Extraterritorial | 2001 |
| Longcliffe Lime Company Limited | Extraterritorial | 1982 |
| Longcliffe Limited | Extraterritorial | 2001 |