| Kate Bellwood Associates LLP | | 2022 |
| Kate Brundrett Associates Ltd | Professional & scientific | 2024 |
| Katy Edgar's Outside Catering Limited | Hospitality | 2004 |
| Kaye Medical Limited | Health & social care | 2021 |
| KCC Catering Ltd | Hospitality | 2026 |
| Keld Energy Limited | Professional & scientific | 2005 |
| Ken's COD & Chips Ltd | Hospitality | 2025 |
| Kendal Cordials Limited | Manufacturing | 2009 |
| Kendal Dental Practice Limited | Financial services | 2016 |
| Kendal Park Estates Limited | Construction | 2021 |
| Kendal Whisky Festival and Events Ltd | Hospitality | 2021 |
| Kennedys Fine Chocolates Limited | Wholesale & retail | 2022 |
| Kennett Accounting Limited | Professional & scientific | 2003 |
| Kenpark Development Limited | Real estate | 2008 |
| Kentdale Property and Garden Services Limited | Construction | 2013 |
| Kerries Cleaning Services Ltd | Administrative & support | 2023 |
| Keswick Adventures Limited | Arts & recreation | 2016 |
| Keswick Brewery Limited | Extraterritorial | 2018 |
| Keswick Brewing Company Limited | Manufacturing | 2018 |
| Keswick Self Storage Limited | Real estate | 2026 |
| Keswickextreme Ltd | Administrative & support | 2013 |
| Kevin Wrathall Limited | Agriculture & fishing | 2014 |
| KEZ Ltd | Professional & scientific | 2011 |
| KFR Consulting Limited | Professional & scientific | 2010 |
| Kickback Services Ltd | Administrative & support | 2018 |
| Kierlock Limited | Professional & scientific | 1976 |
| KIM Collison Ltd | Administrative & support | 2017 |
| Kinfen Properties Limited | Real estate | 2023 |
| Kingdom Mountaineering Ltd | Education | 2024 |
| Kingscoat Limited | Construction | 2001 |
| Kirkbarrow Hall Limited | Agriculture & fishing | 2013 |
| Kirkbride Properties Ltd | Real estate | 2022 |
| Kirkby Thore Storage Ltd | Transport & logistics | 2018 |
| Kirkcross Developments Limited | Construction | 2009 |
| Kirkman Properties Ltd | Real estate | 2024 |
| Kjcass Ltd | Wholesale & retail | 2023 |
| KJP Consultants (Cumbria) Limited | Health & social care | 2011 |
| KL Venning Slaters Ltd | Construction | 2009 |
| Knighton Radiology Ltd | Health & social care | 2025 |
| KPH Plumbing & Civils Ltd | Construction | 2025 |
| Krypton TV Limited | Information & communication | 2006 |
| KSR Housing Compliance Ltd | Administrative & support | 2026 |
| Ktbm Limited | Information & communication | 2010 |
| Ktee Limited | Wholesale & retail | 2004 |
| Kuhl Europe Ltd | Wholesale & retail | 2007 |
| Kundu Hanna Health Limited | Health & social care | 2023 |
| Kurios Environmental Limited | Financial services | 2026 |
| KW Gardens Ltd | Administrative & support | 2019 |
| L & D Building Contractors Limited | Construction | 2008 |
| L Brannen Limited | Health & social care | 2023 |
| L J Renvoize Building Limited | Construction | 2020 |
| L M Brown Limited | Agriculture & fishing | 2014 |
| L P Mcdonald Limited | Agriculture & fishing | 2002 |
| L S F S Limited | Agriculture & fishing | 2002 |
| L W & a Fancott-Beynon Limited | Construction | 2013 |
| L W Taylor Limited | Agriculture & fishing | 2002 |
| L.E.T. Nominees 1 Limited | Professional & scientific | 2012 |
| L.E.T. Nominees 2 Limited | Professional & scientific | 2012 |
| LA CAS1TA Limited | Hospitality | 2019 |
| LA Strong Ltd | Professional & scientific | 2018 |
| Lacy Heights Management Ltd | Households | 2020 |
| Lake District Adventuring Ltd | Administrative & support | 2021 |
| Lake District Giveaways Limited | Other services | 2023 |
| Lake District Pine Cottages Ltd | Hospitality | 2022 |
| Lake View Bowness Limited | Hospitality | 2023 |
| Lakeland and Borders Group Limited | Professional & scientific | 2000 |
| Lakeland Caravan Centre Ltd | Extraterritorial | 1952 |
| Lakeland Carbons Limited | Mining & quarrying | 1991 |
| Lakeland Caterers Limited | Real estate | 1963 |
| Lakeland Coffee @ AB Ltd | Hospitality | 2023 |
| Lakeland Coffee Ltd | Hospitality | 2020 |
| Lakeland Court Limited | Households | 2023 |
| Lakeland Electrical & Dairy Engineers Limited | Professional & scientific | 2025 |
| Lakeland Investments Limited | Professional & scientific | 1972 |
| Lakeland Leisure Services Limited | Administrative & support | 2021 |
| Lakeland Lifestyles Limited | Arts & recreation | 2022 |
| Lakeland Llama Treks Limited | Arts & recreation | 2020 |
| Lakeland Music Limited | Wholesale & retail | 2017 |
| Lakeland Oak Limited | Manufacturing | 2003 |
| Lakeland OPS Ltd | Information & communication | 2026 |
| Lakeland Slate Shop Limited | Wholesale & retail | 2021 |
| Lakeland Vision Ltd | Health & social care | 2008 |
| Lakes and Dales Brewery Ltd | Manufacturing | 2026 |
| Lakes Caravan Storage Limited | Hospitality | 2015 |
| Lakes Cottages Ltd | Hospitality | 2022 |
| Lakes Digital Ltd | Information & communication | 2016 |
| Lakes for ALL Ltd | Hospitality | 2024 |
| Lakes Law Limited | Professional & scientific | 2023 |
| Lakes Living Limited | Wholesale & retail | 2019 |
| Lakes Quest Ltd | Hospitality | 2022 |
| Lakes Renewables Ltd | Construction | 2013 |
| Lakes Soda Company Limited | Manufacturing | 2024 |
| Lakes Stoves Limited | Extraterritorial | 2024 |
| Lakes Valley Retreat Ltd | Hospitality | 2022 |
| Lakes View Limited | Construction | 2019 |
| Lakes Wakesurf Limited | Arts & recreation | 2023 |
| LAKES2TRI Limited | Education | 2024 |
| Lakeside Mobile Mechanics Ltd | Wholesale & retail | 2024 |
| Lakeside Tearooms Limited | Hospitality | 2025 |
| Lamerack Distribution Ltd | Construction | 2025 |