| JPM Finishings Ltd | Construction | 2015 |
| Jpsi Ltd | Extraterritorial | 2025 |
| JR Admin Assist Ltd | Administrative & support | 2014 |
| JRW Accountants Limited | Professional & scientific | 2012 |
| JT Bookshop Limited | Wholesale & retail | 2025 |
| JT Technical Projects Limited | Professional & scientific | 2018 |
| Julian Wain Regeneration and Service Development Limited | Professional & scientific | 2014 |
| Justintime Catering Ltd | Hospitality | 2024 |
| JW Freeman Ltd | Wholesale & retail | 2022 |
| K H Optometry Limited | Professional & scientific | 2023 |
| K W Ryley Asset Reliability Services Limited | Professional & scientific | 2025 |
| K&V Hadzhievi Ltd | Administrative & support | 2018 |
| K&W Power Limited | Wholesale & retail | 2010 |
| K9 Feeds Limited | Wholesale & retail | 2005 |
| KA Network & Cabling Solutions Ltd | Construction | 2017 |
| Karl Hamlin Engineering Limited | Professional & scientific | 2026 |
| Karla Cosmetics Ltd | Other services | 2013 |
| Karthik Srinivasan Plasticsurgery Ltd | Health & social care | 2018 |
| Kash Enterprises Ltd | Wholesale & retail | 2018 |
| Kate Hunter Jewellery Ltd | Manufacturing | 2011 |
| Kd's Coaching Ltd | Arts & recreation | 2024 |
| Kebanging Takeaway Ltd | Hospitality | 2019 |
| Keeplan Ltd | Agriculture & fishing | 2017 |
| Kelia Limited | Information & communication | 2019 |
| Kelso Creative Limited | Professional & scientific | 2026 |
| Kemar International Limited | Wholesale & retail | 2002 |
| Kennedy Water Services Limited | Water & waste | 2025 |
| Kettlebookstore Ltd | Wholesale & retail | 2019 |
| Key Environmental Services Limited | Professional & scientific | 1995 |
| Keystone Chesterfield Ltd | Households | 2018 |
| KH Photography Ltd | Professional & scientific | 2023 |
| Khigoc Ltd | Administrative & support | 2019 |
| Kiernan Engineering Consultants Limited | Construction | 1998 |
| Kimpton Developments LLP | | 2010 |
| King Homes Limited | Real estate | 2016 |
| Kingley's of Warwickshire Ltd | Manufacturing | 2020 |
| Kinwarton Developments Ltd. | Construction | 1998 |
| KKN Solihull Limited | Professional & scientific | 2024 |
| Knight Solutions Building and Landscaping Limited | Administrative & support | 2024 |
| Knight Solutions Construction Limited | Construction | 2024 |
| Kopak Rubber and Plastics Limited | Manufacturing | 2002 |
| Krowe Limited | Professional & scientific | 2004 |
| Kyle Powell Carpentry Ltd | Construction | 2024 |
| Kyscerus Ltd | Wholesale & retail | 2019 |
| L & a Jones Services Ltd | Wholesale & retail | 2020 |
| L & C Solutions (Midlands) Limited | Other services | 2012 |
| L & J Grand Estates Limited | Real estate | 2019 |
| L8 Compliance Limited | Professional & scientific | 2026 |
| LA Galleria Ltd | Hospitality | 2019 |
| LA Macadam Ltd | Construction | 2022 |
| LA Utility Training Ltd | Education | 2024 |
| LAB 210 Ltd | Professional & scientific | 2023 |
| Ladbrooke 98 Ltd | Manufacturing | 1998 |
| Ladders Inc Limited | Information & communication | 2008 |
| Larch ROW Ltd | Real estate | 2022 |
| Larner Associates Ltd | Professional & scientific | 2007 |
| Larner Probate Ltd | Professional & scientific | 2024 |
| Launch Events Management Ltd | Professional & scientific | 2010 |
| Laura Property (Letting & Management Solihull) Ltd | Real estate | 2020 |
| Laura Satchwell Ltd | Professional & scientific | 2023 |
| Lauren Dowson Hair Limited | Other services | 2026 |
| Lavenderstarlight Ltd | Hospitality | 2020 |
| Lawrence Wheeler Agency Ltd | Arts & recreation | 2004 |
| LE Gassicke Property Ltd | Real estate | 2023 |
| Lecram Limited | Manufacturing | 2017 |
| Leon Building Services (the Limes) Management Co. Limited | Real estate | 2007 |
| LEV Academy Limited | Education | 2015 |
| LEY Management Limited | Professional & scientific | 2016 |
| LHF Projects Limited | Manufacturing | 2020 |
| LHS Consultancy Limited | Administrative & support | 2016 |
| LIE Down and Listen Ltd | Information & communication | 2026 |
| Lifesmiles 4 U Midlands LLP | | 2019 |
| Lifestyle Appliances Limited | Wholesale & retail | 2001 |
| Lightning Impact Ltd | Professional & scientific | 2025 |
| Lillystone Group Limited | Construction | 2024 |
| Lime (Birmingham) Limited | Construction | 2023 |
| Limeys Group Limited | Information & communication | 2010 |
| Linderload Ltd | Health & social care | 2021 |
| Lindylou Limited | Professional & scientific | 2019 |
| Linfoot Country Homes Limited | Construction | 2005 |
| Linfoot Oaks (Great Alne) Management Company Limited | Extraterritorial | 2018 |
| Lionheart Boxing & Fitness Limited | Other services | 2026 |
| Little Bird Education Ltd | Education | 2018 |
| Little Furry Orca Ltd | Professional & scientific | 2023 |
| Little Luxe Boutique Ltd | Wholesale & retail | 2025 |
| Little Media Agency Ltd | Professional & scientific | 2019 |
| Livandletbuy Ltd | Wholesale & retail | 2026 |
| Living Clean Solutions Ltd | Administrative & support | 2025 |
| LJM Consulting Engineers Limited | Professional & scientific | 2020 |
| LJS Fire Safety Ltd | Education | 2017 |
| LL Vending Limited | Wholesale & retail | 2024 |
| Lloyd Wilson Partnership Limited | Professional & scientific | 2011 |
| Lloyds Homes (Mount Pleasant) Limited | Households | 2007 |
| Lloyds Homes Limited | Construction | 2012 |
| Lloyds Property Limited | Construction | 2005 |
| LMJ Stonemasons Ltd | Construction | 2024 |
| Loaghtan Limited | Professional & scientific | 2021 |
| Locol Holdings Limited | Professional & scientific | 2016 |
| Locol Property Development Limited | Construction | 2025 |
| Locomotive "6201 Princess Elizabeth" Society Limited | Transport & logistics | 1976 |