| Kingsford Imaging Limited | Professional & scientific | 2003 |
| Kingswinford Developments Limited | Manufacturing | 1995 |
| Kingswinford Estates Limited | Real estate | 2003 |
| Kingswinford Facias Limited | Construction | 2008 |
| Kingswinford Snooker Centre Limited | Arts & recreation | 2003 |
| Kinver Travel Centre Limited | Administrative & support | 2003 |
| Kirrin Holdings Limited | Wholesale & retail | 2024 |
| KJA Properties (Midlands) Limited | Real estate | 2005 |
| KJA Properties Limited | Real estate | 2000 |
| KLB Roofing & Building Company Limited | Construction | 2004 |
| KM Management Limited | Information & communication | 2006 |
| KME Service Centre UK Limited | Manufacturing | 2004 |
| Knight Homes (UK) Limited | Real estate | 2006 |
| Knights Optical Limited | Wholesale & retail | 1996 |
| Knightsbridge Lettings Limited | Professional & scientific | 2005 |
| Knowle Goldsmiths Limited | Wholesale & retail | 1988 |
| KO Scaffolding Services Limited | Construction | 2007 |
| Kolorbond Limited | Professional & scientific | 2007 |
| KRD Financial Advisers Limited | Financial services | 2005 |
| Krothsco Finance Limited | Wholesale & retail | 2004 |
| Krypton Jewellers Limited | Wholesale & retail | 2002 |
| Krystal Investments (UK) Limited | Real estate | 2002 |
| KSK Belt Limited | Manufacturing | 1999 |
| Kunstworld Limited | Administrative & support | 2004 |
| L & J Lonsdale (Holdings) Ltd | Financial services | 2005 |
| L & P Property Consultancy Ltd | Professional & scientific | 2007 |
| L G P Air Conditioning Limited | Construction | 2004 |
| L M H Typing Services Limited | Administrative & support | 2007 |
| L. Davies Roofing Limited | Construction | 2007 |
| L. Pardoe & SON (Iverley) Limited | Agriculture & fishing | 1965 |
| L.Darby & SON Limited | Construction | 1956 |
| L.H. James & SON Limited | Wholesale & retail | 1992 |
| L.M. Products Limited | Manufacturing | 1983 |
| LA Casa Bianca Limited | Hospitality | 1991 |
| Lacedane Limited | Professional & scientific | 1985 |
| Ladon Creations Ltd | Wholesale & retail | 2020 |
| Laidler Steels Limited | Wholesale & retail | 1976 |
| Lakeside Installations Ltd | Construction | 2014 |
| Lally's (Midlands) Limited | Wholesale & retail | 2007 |
| Land Development & Estates Limited | Real estate | 2005 |
| Lang Independent Mortgage Advice Limited | Financial services | 2006 |
| Langley Bowling Club Limited(The) | Real estate | 1923 |
| Langley Business Systems (Retail) Limited | Wholesale & retail | 1995 |
| Lanwarden Limited | Information & communication | 2006 |
| Laphart Limited | | 1975 |
| Larch House Management Company Limited | Households | 2006 |
| Largesse Tenet Trading Limited | Wholesale & retail | 2023 |
| Largus Limited | Administrative & support | 2004 |
| Latch & Batchelor Limited | Manufacturing | 1954 |
| Latneiro (U.K.) Ltd. | Education | 1998 |
| Latv Tovey Electroacoustic Co., Limited | Extraterritorial | 2023 |
| Lawlors Holdings Limited | Professional & scientific | 1997 |
| Lawrencey Limited | Wholesale & retail | 2025 |
| Laxmi Jewellers UK Limited | Wholesale & retail | 2000 |
| LDB Electrical Ltd | Construction | 2005 |
| LE Patisserie Limited | Manufacturing | 2007 |
| Learner Driving Services Limited | Other services | 2004 |
| Learning Transitions Ltd | Education | 2007 |
| Leathermountain Ltd | Wholesale & retail | 2006 |
| Leicester Galvanizing Services Limited | Extraterritorial | 1961 |
| Lenson Select (U.K.) Limited | Wholesale & retail | 1989 |
| LET IT Sparkle Ltd | Information & communication | 2006 |
| LET Select Limited | Professional & scientific | 2006 |
| Leter Ltd | Transport & logistics | 2020 |
| Letting Services Limited | Real estate | 1995 |
| Lewis Food Wholesalers Limited | Wholesale & retail | 2007 |
| Lewis Locks Limited | Manufacturing | 2007 |
| Lewisham Limited | Wholesale & retail | 2004 |
| Lexmedicus Ltd. | Health & social care | 2001 |
| Lexus International Limited | Wholesale & retail | 2004 |
| LH & AH Consultancy Limited | Professional & scientific | 2003 |
| Life Skills Childrens Homes Ltd | Health & social care | 2019 |
| Lifespeak Ltd | Information & communication | 2005 |
| Lifestyle Services Ltd | Wholesale & retail | 2025 |
| LIFT-365 Ltd | Manufacturing | 2026 |
| Lila's Collection Limited | Manufacturing | 2022 |
| LIMIT1 Limited | Administrative & support | 2004 |
| Limmer Holdings Limited | Professional & scientific | 1871 |
| LIN 168 Limited | Hospitality | 2022 |
| Lines AVS Limited | Information & communication | 2002 |
| Link Investments Limited | Real estate | 2002 |
| Linton Services Limited | Manufacturing | 1996 |
| Lion Picture Framing Supplies Limited | Wholesale & retail | 1997 |
| Lion Supplies (West Midlands) Limited | Wholesale & retail | 2003 |
| List Consulting Limited | Administrative & support | 2005 |
| Little Ladbrook Equestrian Limited | Arts & recreation | 2000 |
| Live Life Entertainments Ltd | Arts & recreation | 2014 |
| LJH IT Training & Consultancy Limited | Information & communication | 2007 |
| LKB Services Limited | | 2004 |
| Lockwood Risk Solutions Ltd | Professional & scientific | 2023 |
| Lodar Limited | Manufacturing | 1984 |
| Lodgegrove Developments Limited | Real estate | 2001 |
| Lofts Limited | Professional & scientific | 1999 |
| Long Meadow Works Limited | Real estate | 2025 |
| Longmore Equestrian Centre Limited | Arts & recreation | 2004 |
| Longwell Green Limited Partnership | | 2006 |
| Lonsdale Commercial Storage Limited | Water & waste | 1978 |
| Loomfit Ltd | Wholesale & retail | 2025 |
| Lordswood Construction Ltd | Construction | 2007 |
| Lost Leisure 1 Limited | Arts & recreation | 2007 |