| Kapmech Services Limited | Construction | 2006 |
| Karma Controls Limited | Manufacturing | 2022 |
| Kayes Attractions Limited | Arts & recreation | 2023 |
| Kayes Funfairs & Events Limited | Arts & recreation | 2023 |
| KED Consultancy Ltd | Education | 2022 |
| KEE Clamp Limited | Extraterritorial | 2007 |
| KEE Clamps Limited | Extraterritorial | 2007 |
| KEE Klamp Limited | Extraterritorial | 2007 |
| KEE Klamps Ltd | Extraterritorial | 2007 |
| KEE Safety EBT Limited | Professional & scientific | 2022 |
| KEE Safety Group Limited | Financial services | 2026 |
| KEE Safety International Limited | Extraterritorial | 2026 |
| KEE Safety Limited | Manufacturing | 1996 |
| KEE Safety Logistics Limited | Manufacturing | 1996 |
| KEE Systems Limited | Manufacturing | 1989 |
| Keeh Group Ltd | Construction | 2024 |
| Keencraft Site Services Ltd | Water & waste | 2026 |
| Keith Castonie Nunes Limited | Extraterritorial | 2025 |
| Kenron Hire Limited | Transport & logistics | 1992 |
| Kerman Holdings Limited | Financial services | 2026 |
| Kevin Electrical Services Ltd. | Construction | 2019 |
| Key Clamp Limited | Extraterritorial | 2007 |
| Key Clamps Limited | Extraterritorial | 2007 |
| Key Klamp Limited | Extraterritorial | 2007 |
| Key Klamps Limited | Extraterritorial | 2007 |
| Key Safety Limited | Extraterritorial | 2007 |
| KH Scaffolding (Midlands) Limited | Construction | 2021 |
| KH Scaffolding Limited | Construction | 2009 |
| Khumz Limited | Public administration | 2022 |
| Kimber Drop Forgings Limited | Manufacturing | 1996 |
| Kimbermills International Limited | Financial services | 2024 |
| Kincardine Associates Ltd | Professional & scientific | 2024 |
| Kit's Kitchen Ltd | Hospitality | 2012 |
| KJ Market Ltd | Wholesale & retail | 2026 |
| Kjcarpets&Vinyls Ltd | Wholesale & retail | 2026 |
| Know Limits Limited | Education | 2003 |
| Knytech Ltd | Construction | 2025 |
| KPB Architects Ltd | Professional & scientific | 2021 |
| Krimzkramz Limited | Wholesale & retail | 2012 |
| Krown Logistics Limited | Wholesale & retail | 2025 |
| L G M Cover Services Limited | Transport & logistics | 2002 |
| LA Media Ltd | Information & communication | 2024 |
| LA Tutoring Ltd | Education | 2018 |
| La'Pelle Academy of Dance Ltd | Arts & recreation | 2025 |
| LAB - E - Shiree Curry House & Sweets Ltd | Hospitality | 2022 |
| Larj (Midlands) Ltd | Administrative & support | 2002 |
| Laseredge Fabrication Ltd | Manufacturing | 2025 |
| Laver Law Ltd | Professional & scientific | 2025 |
| LB Bars & Pubs Limited | Hospitality | 2025 |
| LB Trading UK Ltd | Manufacturing | 2009 |
| LBU Consulting Ltd | Professional & scientific | 2019 |
| Lean Technologies Limited | Information & communication | 2014 |
| Lelunar Properties Inc. Limited | Real estate | 2009 |
| Lenvar Limited | Professional & scientific | 1997 |
| Lets Homebiz Ltd | Real estate | 2026 |
| LF Inspection Limited | Construction | 2026 |
| LHC Machining Limited | Manufacturing | 2009 |
| LHL Care Limited | Health & social care | 2025 |
| Lichfield Electrical Limited | Construction | 2022 |
| Lift Craft Limited | Manufacturing | 1988 |
| Light Summan Publishing Limited | Information & communication | 2023 |
| Lighteve Safaris Limited | Administrative & support | 2021 |
| Lighthouse Safety Training Limited | Professional & scientific | 2004 |
| Link Projects & Consultancy Limited | Professional & scientific | 2026 |
| Lins Business Ltd | Hospitality | 2016 |
| Lins Properties Management Limited | Real estate | 2018 |
| Lins WOK 88 Limited | Hospitality | 2025 |
| Lins WOK Limited | Hospitality | 2021 |
| Lion & Sun Ltd | Hospitality | 2026 |
| Liquidus Holdings Limited | Professional & scientific | 2024 |
| Liquor and Spice Ltd | Hospitality | 2026 |
| Liryan Limited | Construction | 2017 |
| Lisaandlil PUB Co. Limited | Hospitality | 2026 |
| Little Explorers (West Midlands) Ltd | Education | 2012 |
| Little Sassy’S Spa Ltd | Other services | 2022 |
| Littlehill Services Limited | Information & communication | 2009 |
| Lloyd Asset Protection Limited | Professional & scientific | 2010 |
| Local Plug Convenience Store Ltd | Wholesale & retail | 2026 |
| Logixs Tech Ltd | Wholesale & retail | 2025 |
| Longbridge Engineering Co. Limited | Administrative & support | 1971 |
| Longfield Transport Limited | Transport & logistics | 2008 |
| LOOK2SYSTEMS Limited | Information & communication | 2025 |
| Lora Leedham Jewellery Limited | Manufacturing | 2015 |
| Love Food Catering Limited | Hospitality | 2025 |
| Lovesign Hub Ltd | Professional & scientific | 2026 |
| LRZ Cradley Heath Ltd | Hospitality | 2021 |
| LSK Property Group Limited | Real estate | 2020 |
| LSK Risk Management Ltd | Financial services | 2017 |
| Lsnr Limited | Health & social care | 2021 |
| Lucina External Structures Ltd | Construction | 2026 |
| Lucky Holding Limited | Real estate | 2024 |
| Lucky Star 168 Limited | Hospitality | 2025 |
| Luma Learning Limited | Education | 2025 |
| Lutlo Ltd | Hospitality | 2026 |
| Luxe Mane Co. Ltd | Other services | 2026 |
| Luxor Events (Sandwell) Ltd | Real estate | 2023 |
| Lynden Ventures Limited | Professional & scientific | 1999 |
| M & a Holdings Limited | Construction | 1998 |
| M & L Catering Limited | Hospitality | 2025 |
| M & L Properties (Midlands) Limited | Real estate | 2017 |