| Kennedy Enterprises (Steeton) Limited | Hospitality | 2019 |
| Kentech Auto Security Ltd | Construction | 2019 |
| Kevin Foley Properties Ltd | Real estate | 2015 |
| Keybury Security Systems Limited | Construction | 1982 |
| Keystone Developments Yorkshire Ltd | Real estate | 2025 |
| Keystone Property Corp Ltd | Real estate | 2026 |
| KF Power Services Ltd | Construction | 2016 |
| KGC (2024) Ltd | Financial services | 2024 |
| KGC (2026) Limited | Arts & recreation | 2026 |
| KH Consulting (England) Ltd | Administrative & support | 2024 |
| KH Scoping Ltd | Health & social care | 2023 |
| Khaas Takeaway Ltd | Hospitality | 2019 |
| Khan's Paper Limited | Wholesale & retail | 2025 |
| Khans Services Limited | Administrative & support | 2015 |
| Kharar Construction Limited | Construction | 2014 |
| Khizar 05 Ltd | Health & social care | 2024 |
| KIB Prime Ltd | Wholesale & retail | 2025 |
| Kicks 4 Kidz Community Interest Company | Other services | 2025 |
| Kidfit Ltd | Education | 2019 |
| Kim.Chi.Mike Ltd | Hospitality | 2025 |
| Kimbledale Limited | Manufacturing | 1983 |
| Kine 23 Limited | Financial services | 2023 |
| King Electrical Services Limited | Construction | 2020 |
| Kingfish Properties Limited | Real estate | 2006 |
| Kingsley Clark Limited | Real estate | 2018 |
| Kingzman Group Ltd | Financial services | 2025 |
| Kinliss Ltd | Other services | 2025 |
| KIP Mcgrath (Keighley) Limited | Education | 2015 |
| Kirkgate Fisheries Limited | Wholesale & retail | 2007 |
| Kisdon Unlimited | Financial services | 2021 |
| Kissper Limited | Manufacturing | 2022 |
| Kitmar Joinery & Building Ltd | Construction | 2016 |
| Kiwi Building Services Ltd | Construction | 2009 |
| Kiwi Landscapes Limited | Construction | 2003 |
| Kiyans Restaurant Ltd | Hospitality | 2023 |
| KJL Estates Limited | Real estate | 2022 |
| KK Solutions Keighley Ltd | Professional & scientific | 2023 |
| KLM Waste&Removals Ltd | Water & waste | 2024 |
| KLP Aesthetics Ltd | Information & communication | 2023 |
| KLY Properties Ltd | Real estate | 2019 |
| Kmvakees Ltd | Wholesale & retail | 2022 |
| Knecto Limited | Wholesale & retail | 2025 |
| Knight Engineers Holdings Limited | Financial services | 2016 |
| Knight Engineers Ltd | Construction | 2007 |
| Knight Property UK Ltd | Extraterritorial | 2009 |
| Knitkidodos Limited | Wholesale & retail | 2025 |
| Knobbles and Bobbles Ltd | Wholesale & retail | 2013 |
| Korner Bar Ltd | Hospitality | 2023 |
| Kounnas Estates Ltd | Real estate | 2025 |
| Kpms (UK) Limited | Construction | 2013 |
| Kraftr Limited | Manufacturing | 2025 |
| KRM Limited | Other services | 1980 |
| Kroon Construction Ltd | Construction | 2024 |
| Krusor Limited | Financial services | 2023 |
| Krusorestates Limited | Real estate | 2023 |
| Krypton Structure Limited | Professional & scientific | 2017 |
| KS Parts Distribution Ltd | Wholesale & retail | 2025 |
| Kushiyara Food Ltd | Hospitality | 2021 |
| KVS Vehicles Limited | Water & waste | 2024 |
| Kw&R Foods Ltd | Hospitality | 2021 |
| Kwidzin Limited | Wholesale & retail | 2024 |
| Kylerhea Limited | Real estate | 2012 |
| L & J Blanco Properties Ltd | Real estate | 2025 |
| L G Properties (Northern) Limited | Real estate | 2022 |
| L Wood (Holdings) Limited | Professional & scientific | 2012 |
| L&S Prints Digital Limited | Manufacturing | 2014 |
| L. Tennant Construction Ltd | Construction | 2014 |
| L. Wood & Co. Limited | Financial services | 1976 |
| LA - Anchor Limited | Hospitality | 2011 |
| LA Nora Luxe Ltd | Wholesale & retail | 2025 |
| LA Piccola Ltd | Hospitality | 2022 |
| LAB Workwear Limited | Wholesale & retail | 2026 |
| Laconian Systems Ltd | Information & communication | 2026 |
| Ladder Financial Ltd | Professional & scientific | 2023 |
| Lads Event Management Ltd | Administrative & support | 2023 |
| Lahb Limited | Education | 2021 |
| Lahore Catering BFD Ltd | Hospitality | 2024 |
| Land Masons Limited | Manufacturing | 2019 |
| Langcliffe Limited | Administrative & support | 2003 |
| Lark Architects Ltd | Professional & scientific | 2015 |
| Latitude Fitness Limited | Arts & recreation | 2021 |
| Lawin Properties Ltd | Real estate | 2022 |
| Lawnsmead Ltd | Professional & scientific | 2023 |
| Lawsons Playzones & Groundworks Ltd | Construction | 2007 |
| Lazeez Spice Ltd | Hospitality | 2025 |
| LD Pubs Ltd | Hospitality | 2019 |
| LE Boutique Limited | Wholesale & retail | 2013 |
| LE Petit Cafe Anglais Ltd | Hospitality | 2020 |
| Leach & Thompson Limited | Manufacturing | 1939 |
| Leading Children Imagine Limited | Wholesale & retail | 2015 |
| Leading Children Limited | Education | 2007 |
| LEAFLET4U Ltd | Professional & scientific | 2026 |
| Learning and Beyond Tuition Ltd | Education | 2025 |
| Learning CUB Keighley Limited | Education | 2025 |
| Learning Cubs Bradford Limited | Health & social care | 2025 |
| LEE Garden Keighley Ltd | Hospitality | 2019 |
| LEE Knox Plumbing & Heating Ltd | Construction | 2024 |
| Lee.Smith Hv/Lv Contracting Ltd | Manufacturing | 2025 |
| Leeds Outsourcing Limited | Other services | 2018 |
| Leeds Property Association | Real estate | 2010 |