| Ingrid LEE Ltd | Professional & scientific | 2019 |
| Inkypure Ltd | Information & communication | 2026 |
| Inlucent Limited | Information & communication | 2021 |
| Innovation Systems Ltd | Information & communication | 2025 |
| Inochem Ltd. | Manufacturing | 1984 |
| Intelligent Fastener Connections Limited | Wholesale & retail | 2016 |
| Intricate Plumbing Contractors Ltd | Construction | 2021 |
| Iphysio Ltd | Health & social care | 2020 |
| IQC International Limited | Wholesale & retail | 1986 |
| Iridium Consult Ltd | Professional & scientific | 2023 |
| Isblue Limited | Professional & scientific | 2016 |
| Ishaas Indian Eatery Limited | Hospitality | 2016 |
| Ishara Press CIC | Information & communication | 2022 |
| Itnetuk.Com Limited | Information & communication | 2003 |
| Izzy Island Limited | Education | 2003 |
| J & L Benson Building Services Ltd. | Construction | 2010 |
| J Fish Education Limited | Education | 2015 |
| J K DIE Cast Models Limited | Wholesale & retail | 2018 |
| J Lawson Electrical Limited | Construction | 2012 |
| J&A Dunnington Limited | Real estate | 2025 |
| J&I Properties (North West) Ltd | Real estate | 2024 |
| J&R Collis Real Estate Ltd | Real estate | 2025 |
| J.B. Aerial Services Limited | Construction | 1998 |
| JA Jackson Limited | Construction | 2022 |
| Jabbatalk Limited | Information & communication | 2010 |
| Jack Benson Electrical Ltd | Construction | 2018 |
| Jackdaw Quarry Heights Limited | Hospitality | 2015 |
| Jackdaw Quarry Lodge Limited | Hospitality | 1980 |
| Jake Island Ltd | Arts & recreation | 2010 |
| James Alex Gray Limited | Information & communication | 2022 |
| James Crossfield & Sons Limited | Real estate | 1924 |
| Jamieson Healthcare Ltd | Health & social care | 2023 |
| Jason Collis Limited | Construction | 2003 |
| Jbco Limited | Hospitality | 2001 |
| JBL Joinery Limited | Construction | 2012 |
| JC Advisory Limited | Professional & scientific | 2014 |
| JCP Electrical Mechanical Services Ltd | Professional & scientific | 2018 |
| JD Uniform & Costumes Limited | Wholesale & retail | 2022 |
| Jeap Consulting Ltd | Professional & scientific | 2021 |
| Jemma Tomsett Limited | Other services | 2012 |
| Jfps NW Ltd | Construction | 2026 |
| Jingling Lane Chippy Limited | Hospitality | 2013 |
| Jingling Lane Training Ltd | Education | 2022 |
| Jjhb Ltd | Construction | 2007 |
| Jkirk Impact Ltd | Professional & scientific | 2024 |
| JMP Electrical Services Limited | Construction | 2004 |
| Jnblee Ltd | Other services | 2026 |
| JOE Shuttleworth Builder Limited | Construction | 2011 |
| John Knox Partnership LLP | | 2022 |
| John Shaw and SON Limited | Transport & logistics | 1972 |
| John Taylor Health Consulting Limited | Information & communication | 2020 |
| John Wilson Motorcycles Ltd | Wholesale & retail | 2013 |
| Jomo Solutions Limited | Information & communication | 2012 |
| JON Fear Commercials Ltd | Wholesale & retail | 2024 |
| JON Griffin Tennis Ltd | Arts & recreation | 2003 |
| Joshmoor Ltd. | Administrative & support | 2011 |
| JPL Arnside Ltd | Real estate | 2019 |
| JT Turner Property Ltd | Real estate | 2026 |
| JTK Northern Limited | Hospitality | 2023 |
| Julian Thornton Limited | Construction | 2002 |
| Just Junior Golf Ltd | Wholesale & retail | 2025 |
| K T Blinds Limited | Wholesale & retail | 2015 |
| Ka-Oz Ltd | Hospitality | 2025 |
| Kaizen Insights Ltd | Education | 2024 |
| Kaplan Care Limited | Health & social care | 2019 |
| Karburn Ltd | Other services | 2026 |
| Kayleigh Winstanley Academy Ltd | Education | 2025 |
| Kayleigh Winstanley Permanent Makeup Ltd | Other services | 2024 |
| Keerford Limited | Transport & logistics | 2017 |
| Keerside Arkholme Carnforth (Property Management) Limited | Households | 2020 |
| Kemprotec Limited | Wholesale & retail | 1998 |
| Kendal Fell Properties Limited | Real estate | 2012 |
| Kentholme Property Management Limited | Real estate | 2014 |
| Kercock Estates Ltd | Agriculture & fishing | 2025 |
| Key Property Rentals Limited | Real estate | 2017 |
| KH Tech Services Limited | Professional & scientific | 2024 |
| KIB Holdings Ltd | Construction | 2026 |
| Kidsafe UK Hcpt Ltd | Administrative & support | 2003 |
| King Dental & Associates Limited | Health & social care | 2007 |
| Kings Hospitality Ltd | Hospitality | 2025 |
| Kingsdale Head Farm LLP | | 2020 |
| Kintera Limited | Professional & scientific | 2025 |
| Kirkby Lonsdale Golf Club Limited | Arts & recreation | 2011 |
| Kirkby Lonsdale Motors Limited | Wholesale & retail | 1974 |
| Kirkby Lonsdale Rugby Union Football Club (Property) Limited | Financial services | 2022 |
| Kitty Brown Boutique Ltd | Wholesale & retail | 2015 |
| KL Glass Limited | Construction | 2019 |
| KLA Creative Ltd | Information & communication | 2020 |
| Kleen-All Limited | Wholesale & retail | 1998 |
| KMT Autos Ltd | Wholesale & retail | 2025 |
| Knights Clothing Ltd | Wholesale & retail | 2023 |
| Knott Aspects Ltd | Construction | 2017 |
| Kottayam Company Limited | Hospitality | 2024 |
| Kraytaclo Limited | Wholesale & retail | 2026 |
| KSM Marketing Limited | Professional & scientific | 2003 |
| KSS North Ltd | Wholesale & retail | 2012 |
| KTL Services Ltd | Professional & scientific | 2015 |
| Kudos International Limited | Manufacturing | 2007 |
| KW Building & Roofing Ltd | Construction | 2014 |
| L a Earl & Co Limited | Manufacturing | 2003 |