| JRH Building Solutions Ltd | Construction | 2023 |
| JSL Fabrication Limited | Manufacturing | 2012 |
| JTL Consultancy Ltd | Construction | 2024 |
| Jubilee Fitness Limited | Administrative & support | 2018 |
| Julian Berson Opticians Limited | Wholesale & retail | 2012 |
| Julian Davies Limited | Administrative & support | 2005 |
| Jutad Limited | Administrative & support | 2026 |
| Jwmw Ltd | Real estate | 2013 |
| K and G Holdings Limited | Financial services | 2023 |
| K Baxter Holdings Ltd | Financial services | 2022 |
| K Mcguinness Optical Limited | Wholesale & retail | 2026 |
| K. France (Opticians) Limited | Health & social care | 1999 |
| K/A Motorworkz Ltd | Wholesale & retail | 2025 |
| K1 Barbers Darwen Ltd | Other services | 2024 |
| K3 Hydration Ltd | Financial services | 2026 |
| Kadas Aris Ltd | Manufacturing | 2021 |
| Karen Helmn Holdings Ltd | Real estate | 2023 |
| Karoo Estates Ltd | Real estate | 2016 |
| Karoo Holdings Ltd | Real estate | 2025 |
| Karram Health & Beauty Ltd | Health & social care | 2012 |
| KAS Electrical Ltd | Construction | 2023 |
| Kason (UK) Limited | Manufacturing | 2015 |
| Kason Europe Limited | Manufacturing | 2009 |
| KAT Rose General Limited | Wholesale & retail | 2025 |
| Kates Hairdressing Limited | Other services | 2022 |
| Kathryn Anthony Optometry Limited | Health & social care | 2003 |
| Katie Hull Limited | Professional & scientific | 2020 |
| Kavanagh Inc Ltd | Hospitality | 2024 |
| Kawds Ltd | Transport & logistics | 2021 |
| KAY Street Darwen Ltd | Wholesale & retail | 2024 |
| KD Drives Ltd | Construction | 2017 |
| Keary Excavations (NW) Ltd | Construction | 2026 |
| Keith Murphy Opticians Limited | Health & social care | 2006 |
| Kemple View Ltd | Hospitality | 2026 |
| Kenley Properties Limited | Real estate | 2002 |
| Kenley Warehousing and Distribution Limited | Transport & logistics | 1985 |
| Kent EYE Care Limited | Health & social care | 2004 |
| Keyes & Mcclellan Eyecare Limited | Wholesale & retail | 2024 |
| KG PUB Co Ltd | Hospitality | 2026 |
| Khadija Kitchen Ltd | Hospitality | 2025 |
| Khadijaskitchen Ltd | Hospitality | 2026 |
| Khan's Grill Darwen Ltd | Hospitality | 2023 |
| Khilg Ltd | Construction | 2011 |
| KHL01 Limited | Health & social care | 2026 |
| KHL02 Limited | Health & social care | 2026 |
| KHL03 Limited | Health & social care | 2026 |
| KHL04 Limited | Health & social care | 2026 |
| Kick and Flick Photography Limited | Professional & scientific | 2024 |
| Kidsland Limited | Health & social care | 1999 |
| Killalea House CIC | Construction | 2024 |
| Killmonster Cafe Limited | Hospitality | 2025 |
| Kimberley Optical Limited | Wholesale & retail | 2024 |
| Kindle Inns & Taverns Limited | Hospitality | 2021 |
| Kingmaker Racedays Limited | Arts & recreation | 2018 |
| Kings Hill Opticians Ltd | Wholesale & retail | 2008 |
| Kingston UK Investments Ltd | Wholesale & retail | 2018 |
| Kingswood Building Services Engineers Limited | Professional & scientific | 2004 |
| KIS Clothing Ltd | Wholesale & retail | 2025 |
| Kmac Pipework Services Ltd. | Administrative & support | 2017 |
| KOH Clinic Limited | Wholesale & retail | 2023 |
| Kohlias Hearing Services Limited | Wholesale & retail | 2026 |
| Kokoro Holdings Limited | Financial services | 2026 |
| Koli Koli Limited | Hospitality | 2026 |
| Krav Maga Video Limited | Education | 2019 |
| KT 365 Consulting Ltd | Information & communication | 2019 |
| L & C Walsh Limited | Administrative & support | 2018 |
| L & S Property Developments Ltd | Real estate | 2025 |
| L C Benz Limited | Wholesale & retail | 2024 |
| L Neve GAS Plumbing & Heating Limited | Construction | 2022 |
| L Thompson Optometrists Limited | Health & social care | 2005 |
| L&R Lettings Ltd | Hospitality | 2026 |
| L1VE Limited | Hospitality | 2019 |
| L39 Aviation Ltd | Administrative & support | 2001 |
| LA Business Services Limited | Information & communication | 2012 |
| Lai's ARK Limited | Real estate | 2022 |
| Lakes & Shakes Ltd | Hospitality | 2022 |
| Lakes Hospitality Help Limited | Professional & scientific | 2023 |
| Lambert and Baxter Limited | Wholesale & retail | 2018 |
| Lambrou Limited | Health & social care | 2014 |
| Lancashire Blast Cleaning Ltd | Transport & logistics | 2004 |
| Lancashire British Furniture Ltd | Manufacturing | 2018 |
| Lancashire Capital Ltd | Other services | 2023 |
| Lancashire Caravans Ltd | Wholesale & retail | 2020 |
| Lancashire Facilities Management Limited | Administrative & support | 2024 |
| Lancashire K9 Security Limited | Administrative & support | 2019 |
| Lancashire Laminators Limited | Extraterritorial | 2010 |
| Lancashire Property Developments Limited | Real estate | 2019 |
| Lancashire Renovations & Properties Limited | Construction | 2023 |
| Lancashire Web Fixers Ltd | Information & communication | 2026 |
| Landoss Technologies Ltd | Information & communication | 2026 |
| Laser Engineering (UK) Ltd | Extraterritorial | 1998 |
| Laser Profiles Limited | Manufacturing | 2000 |
| Laurel Oaks Estate Planning Specialists Ltd | Professional & scientific | 2024 |
| Lawton Meadows (Bartle) Management Company Limited | Households | 2024 |
| LB Support Ltd | Health & social care | 2024 |
| LBG Diagnostics Ltd | Wholesale & retail | 2023 |
| LBI Solutions Limited | Administrative & support | 2017 |
| LC Property Lancs Limited | Real estate | 2015 |
| LD Accident Repair Ltd | Wholesale & retail | 2011 |
| LD H&S Security Risk Ltd | Financial services | 2022 |