| Key Management Consultancy Limited | Professional & scientific | 2024 |
| Key Plant Welderentals (UK) Limited | Administrative & support | 1987 |
| KFE Facades Ltd | Construction | 2024 |
| KFS Consulting Limited | Professional & scientific | 2005 |
| KG EC Takeaway Ltd | Hospitality | 2026 |
| Kian Construction Services Ltd | Construction | 2025 |
| Kieran Edwards Ltd | Manufacturing | 2012 |
| Kiki Lash Ltd | Other services | 2018 |
| Kiks Media Group Ltd | Transport & logistics | 2015 |
| Kinay Health Solutions Limited | Health & social care | 2024 |
| Kingstone Property Services Ltd | Real estate | 2021 |
| Kinney Capital Limited | Financial services | 2022 |
| Kirkham Pharma Limited | Wholesale & retail | 2024 |
| KIT Developments Ltd | Construction | 2023 |
| Kiwiosity Products Limited | Wholesale & retail | 2009 |
| KJ Interiors Ltd | Construction | 2018 |
| KKC Communications Ltd | Information & communication | 2011 |
| Kleana Ltd | Information & communication | 2025 |
| Klic Services Ltd | Professional & scientific | 2020 |
| KLS Dance Academy Ltd | Professional & scientific | 2019 |
| KLS Facilities Management Ltd | Professional & scientific | 2015 |
| KLT Consultancy Ltd | Information & communication | 2023 |
| Klubusiness Ltd | Transport & logistics | 2023 |
| KM96 Ltd | Health & social care | 2024 |
| KMB Insulations Ltd | Construction | 2025 |
| Knauf Insulation Limited | Manufacturing | 1985 |
| Knightsbridge Doors & Windows Limited | Wholesale & retail | 2016 |
| Knotty ASH Catering Ltd | Hospitality | 2026 |
| Kobus Services Limited | Manufacturing | 2005 |
| Kocheda Ltd | Information & communication | 2022 |
| Kommerzo Ltd | Wholesale & retail | 2026 |
| Kopi Food UK Ltd | Hospitality | 2024 |
| Kosta Expres Ltd | Transport & logistics | 2014 |
| Koya Ventures Ltd | Information & communication | 2026 |
| Krakulu Limited | Manufacturing | 2021 |
| Kram Care Ltd | Health & social care | 2018 |
| Krekar Car Wash Ltd | Administrative & support | 2025 |
| KS Holdings (NW) Ltd | Real estate | 2021 |
| KS Property Solutions Group Ltd | Real estate | 2026 |
| KSA Deli Ltd | Hospitality | 2018 |
| KTD Construction (Rose) Ltd | Construction | 2022 |
| KTP Pro Beauty Services Ltd | Other services | 2019 |
| KTY Transport Ltd | Transport & logistics | 2025 |
| Kverneland Devizes Limited | Manufacturing | 1991 |
| Kwik Seal Limited | Construction | 2013 |
| KWM Consultants Limited | Administrative & support | 2022 |
| L & D Williams Haulage Ltd | Transport & logistics | 2004 |
| L & L Travel Ltd | Transport & logistics | 2021 |
| L B Premier Property Limited | Real estate | 2025 |
| L E Travel Ltd | Transport & logistics | 2024 |
| L Heyes Ltd | Health & social care | 2025 |
| L Hogan Ltd | Construction | 2026 |
| L&L Aesthetics Ltd | Other services | 2025 |
| L.A.H83 Ltd | Other services | 2017 |
| L.W. Ceramics (North West) Limited | Construction | 2015 |
| L1 Barber ST Helens Ltd | Other services | 2025 |
| LA Curtain Galleria Limited | Other services | 2002 |
| LA Investment Properties Ltd | Real estate | 2025 |
| LAB Kitchens Ltd | Manufacturing | 2021 |
| Ladebb Global Investments Ltd | Professional & scientific | 2026 |
| Laith Driver Training Ltd | Education | 2023 |
| Lakes Holiday Homes Limited | Hospitality | 2020 |
| LAL Retailers Ltd | Wholesale & retail | 2025 |
| Land at Scarisbrick Limited | Real estate | 2024 |
| Lang Business Consultancy Limited | Administrative & support | 1999 |
| Langley Chippy Ltd | Hospitality | 2023 |
| Larkhill Transport Limited | Transport & logistics | 2023 |
| Larott Group Creations Ltd | Wholesale & retail | 2024 |
| Lash Artistry UK Ltd | Other services | 2018 |
| Latin Eats Ltd | Hospitality | 2025 |
| Laughton & Wallace Limited | Professional & scientific | 2019 |
| Lauk Group Ltd | Other services | 2019 |
| Laupaw Restaurants Ltd | Hospitality | 2019 |
| Lauren Hudson Limited | Health & social care | 2022 |
| Lauren Jane Studios Ltd | Other services | 2021 |
| Law Distribution Limited | Transport & logistics | 1994 |
| Lawrenson Associates Limited | Professional & scientific | 2003 |
| Lawrenson Building Contractors Limited | Construction | 2007 |
| LB Inspection Services Limited | Professional & scientific | 2011 |
| LB Offshore Limited | Manufacturing | 2023 |
| Lbmb Consulting Limited | Professional & scientific | 2025 |
| LCA Logistics Ltd | Transport & logistics | 2014 |
| LCG Occupational Health Solutions Ltd | Health & social care | 2023 |
| LD Investment Properties Ltd | Real estate | 2025 |
| LDB Accounting Consultants Limited | Professional & scientific | 2025 |
| LE Boutique Home Limited | Wholesale & retail | 2020 |
| Leadsin Ltd | Information & communication | 2014 |
| Leaps & Bounds Electrical Limited | Construction | 2024 |
| Lechuguitaverde Ltd | Wholesale & retail | 2023 |
| Ledger Scaffolding NW Ltd | Construction | 2026 |
| LEE Yarnold Services Ltd | Transport & logistics | 2018 |
| Leema Events Ltd | Hospitality | 2022 |
| Lees Industrial Services Limited | Water & waste | 2003 |
| Legal Training Ltd | Professional & scientific | 2019 |
| Leigh View Healthcare Limited | Wholesale & retail | 2023 |
| Leigh's Developments Ltd | Real estate | 2026 |
| Lemon Shed Limited | Administrative & support | 2003 |
| Lemtec Ltd | Construction | 2026 |
| Leommè Ltd | Manufacturing | 2024 |
| Leon Constructors Limited | Construction | 2025 |