| Kain Mcewen Electrical Contractors Ltd | Construction | 2022 |
| Kala Barbers Ltd | Other services | 2025 |
| Kayelogistics Ltd | Transport & logistics | 2025 |
| Kbba Ltd | Arts & recreation | 2018 |
| Keith Smith & SON Ltd | Construction | 2007 |
| Kelly and Daughters Real Estate UK Ltd | Real estate | 2020 |
| Kelly's PAW Pals Limited | Other services | 2026 |
| Kelson Danley Properties Ltd | Real estate | 2019 |
| Kendal Gateway Retreat Ltd | Real estate | 2026 |
| Kennedy Hunter LLP | | 2024 |
| Kicksat Preparations Ltd | Information & communication | 2022 |
| Kids Come First Limited | Education | 2015 |
| Kilby Solutions Limited | Information & communication | 2012 |
| Kill House Airsoft Ltd | Arts & recreation | 2018 |
| KIM Nails Beauty Spa Ltd | Other services | 2022 |
| Kinetic Tennis Ltd | Education | 2018 |
| Kings Beds Ltd | Manufacturing | 2016 |
| Kinra Consultancy Ltd | Professional & scientific | 2023 |
| Kirklees Properties Limited | Real estate | 1911 |
| Kirkley Electrical Limited | Construction | 2020 |
| Kitchen Warehouse (HX) Ltd | Manufacturing | 2004 |
| KJA Accountants Limited | Professional & scientific | 2017 |
| KJA Group Limited | Professional & scientific | 2001 |
| KJA Holdings Ltd | Financial services | 2021 |
| KJA Kilner Johnson Limited | Professional & scientific | 2010 |
| KJA Payroll Bureau Limited | Administrative & support | 2013 |
| KK Icon Ltd | Other services | 2021 |
| KKA Holidays Ltd | Hospitality | 2024 |
| Kneen Plumbing & Heating Limited | Construction | 2012 |
| Konsult KO Limited | Professional & scientific | 2026 |
| Kool Katz Fitness Limited | Arts & recreation | 2019 |
| Kosta Services Limited | Other services | 2018 |
| Kreativeinc Agency Ltd | Information & communication | 2021 |
| Krypt Fauna Ltd | Financial services | 2025 |
| KS Wholesalers Ltd | Wholesale & retail | 2018 |
| Kundan House Ltd | Real estate | 2025 |
| KVC Express Ltd | Wholesale & retail | 2025 |
| KYA Global Limited | Education | 2012 |
| L & L Properties (Wakefield) Limited | Real estate | 2023 |
| L a Consulting Engineers Ltd | Professional & scientific | 2020 |
| L Harwood DRY Lining & Rendering Contractors Limited | Construction | 2021 |
| L Myers Financial Associates Limited | Information & communication | 2011 |
| L&E Public House Ltd | Hospitality | 2024 |
| L&F PUB Ltd | Hospitality | 2019 |
| L.K. Performance Ltd | Wholesale & retail | 2008 |
| L2J Construction Limited | Construction | 2017 |
| L2J Developments Limited | Construction | 2022 |
| LA Bake Limited | Manufacturing | 2014 |
| LA Creative Limited | Arts & recreation | 2012 |
| LA Famille Properties Limited | Real estate | 2019 |
| Lace Domestic Projects Limited | Professional & scientific | 2021 |
| Lacey Brooks Ltd | Real estate | 2019 |
| LAK Advertisers Ltd | Information & communication | 2021 |
| Laks Takeaway Ltd | Hospitality | 2023 |
| Lamccal Limited | Manufacturing | 2018 |
| Lamont Jones Ltd | Administrative & support | 2006 |
| Lamsin Estates Limited | Real estate | 2023 |
| Land & Sea Cable Jointing Services Ltd | Construction | 2022 |
| Landlords Paint Ltd | Manufacturing | 2026 |
| Laney's Legacy Ltd | Wholesale & retail | 2022 |
| Langley Refrigeration & Air Conditioning Ltd | Construction | 2022 |
| Langstaff Furniture Limited | Manufacturing | 2023 |
| Lanna Thai Healing Massage Ltd | Health & social care | 2026 |
| Larj Services Ltd | Wholesale & retail | 2016 |
| Larvin & Whiteley (Building Contractors) Limited | Construction | 2011 |
| Last Drop Ltd | Hospitality | 2026 |
| Laurel Heath Properties Ltd | Real estate | 2026 |
| Laycast Limited | Manufacturing | 1988 |
| LC Sports Coaching Limited | Administrative & support | 2014 |
| Lcep Ltd | Other services | 2016 |
| LDC Investments Ltd | Real estate | 2025 |
| LDC Yoga and Wellbeing Ltd | Arts & recreation | 2026 |
| LDH Civils Ltd | Construction | 2021 |
| LDW Capital Ltd | Financial services | 2026 |
| Le's Sweet BBQ Ltd | Hospitality | 2026 |
| Leading Edge Projects Limited | Manufacturing | 1952 |
| Leading Labels Brands Ltd | Wholesale & retail | 2023 |
| Leading Labels Ltd | Wholesale & retail | 1993 |
| Leaflet Delivery Yorkshire Limited | Administrative & support | 2023 |
| Leanne Gonzalez Events Limited | Arts & recreation | 2024 |
| Learn With Ella Limited | Education | 2019 |
| Leeds Electrical Limited | Construction | 2026 |
| Leeds Junk & Rubbish Limited | Water & waste | 2017 |
| Leeds Language College Limited | Education | 2006 |
| Legacy Sports & Talent Ltd | Arts & recreation | 2025 |
| Lensnest Ltd | Professional & scientific | 2025 |
| Leonard R. Pearson & Co. Limited | Manufacturing | 1983 |
| Lets Away Limited | Wholesale & retail | 2003 |
| Lettuce Digital Limited | Information & communication | 2018 |
| Level 7 Barbers Limited | Other services | 2023 |
| Levison Group of Companies Limited | Financial services | 2012 |
| Lexa Hair Ltd | Wholesale & retail | 2024 |
| LGH Property Ltd | Real estate | 2018 |
| LGI Holdings Limited | Financial services | 2025 |
| Lighthouse Cost Consulting Limited | Professional & scientific | 2016 |
| Lightspeed Comms Limited | Information & communication | 2012 |
| Lime Square Environmental LLP | | 2011 |
| Limini Coffee Services Limited | Wholesale & retail | 2008 |
| Lindleymoor FC CIC | Arts & recreation | 2020 |
| Lingcroft Associates Limited | Manufacturing | 1989 |