| Khurana Construction Ltd. | Construction | 2023 |
| Kingdom Central | Other services | 2014 |
| Kingdomcrest Limited | Construction | 1995 |
| Kiranrose Ltd | Transport & logistics | 2025 |
| Kissane & Jeffries (Recovery Services) Ltd | Wholesale & retail | 2008 |
| Kitchen Express (Midlands) Ltd | Hospitality | 2016 |
| Kitchens Reloved Ltd | Extraterritorial | 2024 |
| Kiyara Cakes Ltd | Wholesale & retail | 2026 |
| KL Consulting & Services Ltd | Administrative & support | 2025 |
| KL Estates Limited | Real estate | 2022 |
| Klgnv (Casing) Limited | Professional & scientific | 2018 |
| Klgnv (Rowley) Limited | Financial services | 2015 |
| Knight Beers Ltd | Hospitality | 2018 |
| Kolegi Music Ltd | Information & communication | 2025 |
| KPC Management Ltd | Professional & scientific | 2026 |
| KS Hayre Property & Investments Ltd | Real estate | 2025 |
| Kudos Digital Ltd | Wholesale & retail | 2022 |
| KWH Advisory & Development Limited | Energy | 2021 |
| L Gordon Ltd | Construction | 2022 |
| L&M UK Construction Ltd | Construction | 2019 |
| Lalpuria Limited | Transport & logistics | 2026 |
| Lana's Pizza Ltd | Hospitality | 2025 |
| Langford Exterior Ltd | Administrative & support | 2026 |
| Lapco Tech Limited | Information & communication | 2018 |
| Larcher Monteiro Practice Ltd | Health & social care | 2025 |
| Lastingsales Ltd | Information & communication | 2019 |
| Laverock Services Limited | Wholesale & retail | 1991 |
| LDS Social Ltd | Health & social care | 2015 |
| Ldw-Collectibles Ltd | Wholesale & retail | 2026 |
| Leaf Clothing Ltd | Wholesale & retail | 2019 |
| Lebc Midlands Ltd. | Construction | 2005 |
| LEE Plant Anaesthetic Services Limited | Health & social care | 2015 |
| LEI Accountancy Ltd | Professional & scientific | 2020 |
| Leon's Traffic Management Solutions Ltd | Other services | 2021 |
| Lex’S Liners Ltd | Other services | 2025 |
| LGF Play Cafes Ltd | Hospitality | 2016 |
| LHG Management Ltd. | Financial services | 2025 |
| Lighting Design Direct Ltd | Construction | 2022 |
| Linski Ltd | Transport & logistics | 2019 |
| Lion Mechanical Services Ltd | Wholesale & retail | 2023 |
| Little Green Bookworm CIC | Hospitality | 2018 |
| LJC Safety Ltd | Professional & scientific | 2026 |
| Longdon Homes Limited | Real estate | 2006 |
| Longleat Consultancy Services Limited | Professional & scientific | 2003 |
| Longxing 88 Ltd | Hospitality | 2023 |
| Louger Bodess International Ltd | Information & communication | 2025 |
| Loveday Hood Holdings Ltd | Administrative & support | 2019 |
| LPO Electrical Ltd | Construction | 2015 |
| Lucas Fast Transport Ltd | Transport & logistics | 2021 |
| Lucky Spice Restaurant Ltd | Hospitality | 2025 |
| Lukes Trading Ltd | Wholesale & retail | 2025 |
| Lukzak Ltd | Transport & logistics | 2025 |
| Lupia Amenagement Limited | Real estate | 2025 |
| LUX Band Ltd | Arts & recreation | 2022 |
| M&C Fabrication Ltd | Manufacturing | 2025 |
| M&Mm Sports Limited | Wholesale & retail | 2021 |
| M-J Ductwork Ltd | Energy | 2019 |
| M.A 24 Couriers Ltd | Transport & logistics | 2022 |
| M.A.D Cladding Ltd | Construction | 2018 |
| MA Motors Garage Ltd | Wholesale & retail | 2017 |
| Major Coachways Limited | Transport & logistics | 2007 |
| Malak Tradings Ltd | Extraterritorial | 2020 |
| Malik & Suleman Ltd | Real estate | 2024 |
| Mallyville Car Sales Ltd | Wholesale & retail | 2004 |
| Mallyville Developments Limited | Extraterritorial | 2004 |
| Mallyville Limited | Wholesale & retail | 2007 |
| Malt Shovel Bar & Grill Ltd | Hospitality | 2015 |
| MAN & HS Ltd | Transport & logistics | 2026 |
| Mandla Healthcare Services Ltd | Health & social care | 2018 |
| Manpower Construction (Birmingham) Limited | Construction | 2020 |
| Maps 2 U Ltd | Other services | 2015 |
| Marai UK Ltd | Professional & scientific | 2024 |
| Mark One Building Services Limited | Construction | 2020 |
| Marketing Dynamix Ltd | Information & communication | 2017 |
| Mars Haulage Ltd | Transport & logistics | 2025 |
| Martin Bros Marketing Limited | Professional & scientific | 2025 |
| Match Property Services Ltd | Construction | 2023 |
| Matco Industries Limited | Extraterritorial | 1987 |
| Matterhorn Property Ltd | Real estate | 2023 |
| Maxian Industrial Services Ltd | Construction | 2024 |
| MAYAISAAC43786 Ltd | Health & social care | 2022 |
| Mayneweb Ltd | Information & communication | 2025 |
| Mazen Limited | Households | 2026 |
| Mead Automotive Ltd | Wholesale & retail | 2018 |
| Medina Market Ltd | Wholesale & retail | 2022 |
| Medina Munawwara Ltd | Wholesale & retail | 2025 |
| Megaf Care Limited | Health & social care | 2022 |
| Megaf Properties Ltd | Real estate | 2025 |
| Megraf Limited | Health & social care | 2026 |
| Mehmet Amazon Ltd | Transport & logistics | 2024 |
| Memorials of Stone by Heidi Gaunt Limited | Manufacturing | 2007 |
| MG Electrical Site Services Limited | Construction | 2025 |
| Miah Tandoori (BD) Ltd | Hospitality | 2024 |
| Michael Super Market (Black Heath) Limited | Wholesale & retail | 1980 |
| Michaels Local Ltd | Wholesale & retail | 2013 |
| Midland Battery Services Limited | Wholesale & retail | 1991 |
| Midland Brakes Limited | Manufacturing | 2009 |
| Midland Brassware Ltd | Wholesale & retail | 2017 |
| Midland Retail Supply Limited | Wholesale & retail | 2012 |
| Midlands Anaesthesia and Critical Care Services Ltd | Health & social care | 2019 |