| Kingsmen Talent Solutions Limited | Administrative & support | 2026 |
| Kingsway Glazing Limited | Construction | 1998 |
| Kingsway Properties (Midlands) Limited | Real estate | 2005 |
| Kinnego Partners Ltd | Professional & scientific | 2021 |
| Kinsall Green Cars Ltd | Wholesale & retail | 2021 |
| Kitchen Promax Ltd | Construction | 2023 |
| Kitchens in Synk Limited | Construction | 2018 |
| Kitebrook Partnership Limited | Real estate | 2025 |
| Kitson Locomotives Limited | Extraterritorial | 2004 |
| KKD Digital Ltd | Professional & scientific | 2025 |
| KKS Holistic Therapies Ltd | Other services | 2025 |
| KLF Tamworth Limited | Manufacturing | 2018 |
| Kljp Limited | Professional & scientific | 2026 |
| KLM Flooring Ltd | Construction | 2024 |
| KMC Events Ltd | Hospitality | 2025 |
| KMK Express Ltd | Transport & logistics | 2025 |
| KN Installers Ltd | Transport & logistics | 2025 |
| Knight Property Services Ltd | Real estate | 2025 |
| Knights Homes and Investments Ltd | Real estate | 2021 |
| Knox Fire & Security Limited | Construction | 2011 |
| KNS Heating Solutions Ltd | Construction | 2010 |
| KOG Estates Limited | Hospitality | 2021 |
| Kompli Ltd | Information & communication | 2026 |
| Konnect Technical Limited | Energy | 2021 |
| Kore Electrical Services Limited | Construction | 2023 |
| Kovix Development Ltd | Real estate | 2021 |
| KP Electrical Connections Limited | Wholesale & retail | 2009 |
| KP Property and Developments Ltd | Households | 2025 |
| KPG Quantity Surveying Services Ltd | Professional & scientific | 2014 |
| KR 4 HR Coaching & Consultancy Ltd | Administrative & support | 2024 |
| KR Interior Solutions Ltd | Construction | 2020 |
| Kraft KH Limited | Wholesale & retail | 2025 |
| Krgh Services Limited | Information & communication | 2011 |
| Kris Ceilings Ltd | Construction | 2024 |
| KRL Investments Limited | Extraterritorial | 2015 |
| Krome Management Solutions Ltd | Transport & logistics | 2025 |
| Kryadi Ltd | Transport & logistics | 2020 |
| KT Groundworks Ltd | Administrative & support | 2023 |
| Kudos Construction and Property Ltd | Construction | 2017 |
| Kudos Midlands Ltd | Hospitality | 2025 |
| Kura Tech Ltd | Information & communication | 2025 |
| KV Tanning Ltd | Other services | 2024 |
| Kwikpaints Ltd | Manufacturing | 2011 |
| Kyabak Ltd | Public administration | 2023 |
| Kynetic Drive Ltd | Education | 2025 |
| L & a Danks Properties Ltd | Real estate | 2020 |
| L & J Construction Limited | Construction | 1981 |
| L & L Sameday Logistics Ltd | Transport & logistics | 2026 |
| L & S Business Services Ltd | Professional & scientific | 2002 |
| L a Travel (Midlands) Limited | Transport & logistics | 2018 |
| L and K Property Holdings Ssas Limited | Financial services | 2026 |
| L Clarke's Electrical Ltd | Construction | 2025 |
| L J Hudson Civil Engineering Ltd | Construction | 2022 |
| L K Matthews Limited | Manufacturing | 2003 |
| L S Thompson Investments Ltd | Financial services | 2025 |
| L&G Developments Hold Co Limited | Extraterritorial | 2019 |
| L&K Events Ltd | Administrative & support | 2014 |
| L.A Dance Room Ltd | Wholesale & retail | 2025 |
| L.C.J Systems Limited | Construction | 2007 |
| L.K. Fleet Solutions Ltd | Wholesale & retail | 2023 |
| L.L. Nominees Limited | Information & communication | 2012 |
| L.T.R. Joinery Limited | Construction | 2004 |
| L.Tak Limited | Information & communication | 2017 |
| LA Food Distribution Limited | Hospitality | 2012 |
| LA Holding Limited | Professional & scientific | 2011 |
| LA Lena Ltd | Wholesale & retail | 2020 |
| Labuda Outlet Ltd | Wholesale & retail | 2015 |
| Lady Acorn Limited | Agriculture & fishing | 2008 |
| Lakeside Property Developments Ltd | Real estate | 2026 |
| Lakeside Stores (UK) Ltd | Wholesale & retail | 2013 |
| Lakha Private Ltd | Wholesale & retail | 2018 |
| Lakin Carpet & Flooring Company Ltd | Construction | 1988 |
| LAM Security Solutions Limited | Administrative & support | 2022 |
| Lance Simon Manyer Limited | Extraterritorial | 2024 |
| Landbay Limited | | 1986 |
| Langston Care Limited | Health & social care | 2009 |
| Langstone Engineering Ltd. | Manufacturing | 2001 |
| Langstone Securities Limited | Professional & scientific | 2010 |
| Lanton Design Limited | Professional & scientific | 1988 |
| Laser Forge Studio Ltd | Manufacturing | 2025 |
| Lash Emporium Limited | Other services | 2010 |
| Last Birmingham Ltd | Professional & scientific | 2003 |
| Lathbury Financial Services Ltd | Professional & scientific | 2022 |
| Latter Ramsay Consultants Ltd. | Professional & scientific | 1990 |
| Laughing Bulldog Events Ltd | Arts & recreation | 2024 |
| Laumax Limited | Transport & logistics | 2014 |
| Laura James Hair Salon Limited | Other services | 2006 |
| Laura Jane Law Limited | Health & social care | 2016 |
| Laurel House Estates Ltd | Real estate | 2025 |
| Lavinium Holdings Ltd | Administrative & support | 2018 |
| Law & Law Property Investments UK Ltd | Real estate | 2021 |
| Lawrence Industries Limited | Wholesale & retail | 1993 |
| Lawrencia and Co Solicitors Ltd | Professional & scientific | 2020 |
| Lawrie Bennett Ltd | Construction | 2021 |
| Laxford Estates Management Limited | Real estate | 2023 |
| Laydene Limited | | 1988 |
| LB Commercial Interiors Limited | Construction | 2019 |
| LBP Homes Ltd | Real estate | 2019 |
| Lbpg Limited | Households | 2026 |
| LBW Machines Ltd | Mining & quarrying | 2011 |