| Kay's Kiosk Ltd | Wholesale & retail | 2017 |
| Kayla Supported Living Ltd | Health & social care | 2020 |
| KB Mortgage Services Ltd | Financial services | 2016 |
| KBB Holmfirth Limited | Construction | 2017 |
| KCW Holdings Limited | Hospitality | 2016 |
| KCW Laundry Services Ltd | Other services | 2021 |
| KCW Ltd | Real estate | 2013 |
| Keenan and Sanders Architects Ltd | Professional & scientific | 2021 |
| Kelcon Properties Ltd | Real estate | 2024 |
| Kelly Plumbing and GAS Services Limited | Construction | 2002 |
| Kemba Technical Services Limited | Information & communication | 2015 |
| Kerr Studio Limited | Information & communication | 2022 |
| Kettle 13 Ltd | Hospitality | 2018 |
| Key Futures CIC | Education | 2026 |
| KG Bathrooms Limited | Construction | 2016 |
| Kidsbedsonline Ltd | Wholesale & retail | 2015 |
| Kien TAN Limited | Professional & scientific | 2016 |
| Kilian Wine Consultancy Ltd | Administrative & support | 2017 |
| Kilnerco Ltd | Professional & scientific | 2025 |
| KIN Spirits Limited | Agriculture & fishing | 2019 |
| Kingsway Facility Solutions Ltd | Professional & scientific | 2018 |
| Kirkburton Dental Care Limited | Health & social care | 2008 |
| Kirklees Community Association | Hospitality | 1993 |
| Kirklees Telecom Limited | Information & communication | 2012 |
| Kitsune Kitchen Ltd | Hospitality | 2026 |
| Kiwi Consulting Solutions Ltd | Professional & scientific | 2021 |
| KJS Consulting Limited | Professional & scientific | 2022 |
| KK Sauce Ltd | Wholesale & retail | 2026 |
| Kleiber (U.K.) Ltd. | Wholesale & retail | 1990 |
| KLH Gates & Automation Ltd | Construction | 2020 |
| Kloska Heating Services Ltd | Construction | 2019 |
| Kloud Genius Ltd | Information & communication | 2024 |
| Known AIM Ltd | Professional & scientific | 2015 |
| KP Commercial Vehicle Finishers Ltd | Manufacturing | 2017 |
| KQ Certification Ltd | Professional & scientific | 2023 |
| Krafty 11 Ltd | Hospitality | 2022 |
| Kreme DE LA Kreme Limited | Professional & scientific | 2018 |
| Krnk Collective Ltd | Real estate | 2025 |
| Kudos Doors Ltd | Construction | 2013 |
| Kultist Sales Limited | Wholesale & retail | 2026 |
| Kurdistan Business Excellence Academy CIC | Education | 2025 |
| Kurdistan Business Excellence Network CIC | Education | 2025 |
| Kurdistan Leadership Development Academy CIC | Education | 2025 |
| Kurdistan Quality and Auditing Academy | Education | 2025 |
| Kushim Providence Ltd | Wholesale & retail | 2026 |
| Kynd Wellness Ltd | Other services | 2021 |
| L and E Investments Limited | Real estate | 2016 |
| L C Lettings Limited | Real estate | 2018 |
| L R Law Cost Consultants Limited | Professional & scientific | 2011 |
| L&T Hopkinson Ltd | Real estate | 2026 |
| Laal Blue DOT Ltd | Information & communication | 2019 |
| Labhome Limited | Professional & scientific | 1985 |
| LAMB2EWE Limited | Wholesale & retail | 2019 |
| Lambull Limited | Administrative & support | 2015 |
| Lampy Investments Limited | Real estate | 2018 |
| Lamt Holdings Ltd | Financial services | 2020 |
| Lamt Trading Ltd | Hospitality | 2023 |
| Land Regeneration Partnership Ltd | Professional & scientific | 2026 |
| Laneapps Limited | Education | 2014 |
| Lanemedicals Limited | Health & social care | 2025 |
| Langrick Investments Limited | Professional & scientific | 2009 |
| Langrick Properties Limited | Real estate | 2020 |
| Langricks (Audit) Limited | Professional & scientific | 2023 |
| Langricks (Holmfirth) Limited | Professional & scientific | 2009 |
| Laser Blasting and Derusting Limited | Other services | 2023 |
| Laser Medics Group Limited | Education | 2025 |
| Lassiere Mills Limited | Manufacturing | 1949 |
| Laund Road Huddersfield Ltd | Real estate | 2015 |
| Lavitta Limited | Construction | 2014 |
| LD Baxter Properties Ltd | Real estate | 2026 |
| LDN Construct Ltd | Construction | 2019 |
| Leagus Limited | Information & communication | 1999 |
| Leahy+King Limited | Professional & scientific | 2019 |
| LEARN2LEAD2SUCCEED Ltd | Education | 2010 |
| Learnezi Limited | Education | 2023 |
| Leas Hall Management Limited | Households | 1987 |
| Leeds Travel and Events Limited | Administrative & support | 2025 |
| Legacy Sport Kirklees CIC | Health & social care | 2023 |
| Legacy Sport South Kirklees Limited | Arts & recreation | 2013 |
| LEO Property Developments Limited | Real estate | 2025 |
| LEO Property Group Holdings Limited | Financial services | 2025 |
| LEO Property Rentals Limited | Real estate | 2025 |
| Leonard Capital Ventures Limited | Financial services | 2026 |
| LES Heywood & SON Limited | Construction | 2003 |
| Letter Box Eatery Limited | Hospitality | 2025 |
| Lewis Contracting Group Ltd | Professional & scientific | 2022 |
| Lewis Haigh & Sons Limited | Construction | 2008 |
| Leythe Marketing Ltd | Professional & scientific | 2011 |
| LF Joinery Limited | Construction | 2019 |
| Liberal Elite Skateboards Ltd | Manufacturing | 2015 |
| Libertine 13 PMO Consultancy Ltd | Professional & scientific | 2018 |
| Lifts US UP Ltd | Construction | 2025 |
| Lightbridge Property Ltd | Real estate | 2021 |
| Lightbulb Language and Arts Ltd | Education | 2025 |
| Lightowlers Yarns Limited | Manufacturing | 1960 |
| Lightridge Limited | Health & social care | 2013 |
| Lightspace Homes Limited | Construction | 2005 |
| Lightspace Management Company Limited | Real estate | 2008 |
| Liles Construction Limited | Construction | 2008 |
| Lincoln Properties & Estates Limited | Real estate | 2007 |