| JOE Martins Private Cardiology Ltd | Health & social care | 2013 |
| Joey Auto Group Ltd | Wholesale & retail | 2021 |
| JOG & Shuttle Limited | Information & communication | 2008 |
| JOHAL14 Estates Ltd | Financial services | 2024 |
| John Craddock Limited | Wholesale & retail | 1980 |
| John Horton Plant Hire Limited | Construction | 2007 |
| John J Davies Logistics Limited | Manufacturing | 2016 |
| John Lomas Removals Limited | Transport & logistics | 2011 |
| John Reynolds and Associates Limited | Professional & scientific | 1995 |
| John Salmon (Cannock) Limited | Wholesale & retail | 1957 |
| John Street Barber Shop Limited | Other services | 2025 |
| John Toon Limited | Other services | 2002 |
| John Toovey Road and Race Limited | Manufacturing | 2006 |
| Johnson Jones Holdings Limited | Real estate | 2022 |
| Jolly Goodness Limited | Manufacturing | 2022 |
| Jones Consultancy Services Limited | Professional & scientific | 2009 |
| Jones Creative Studio Limited | Professional & scientific | 2025 |
| Jones Holdings Group Limited | Financial services | 2025 |
| Jones's Haulage Ltd | Transport & logistics | 2025 |
| Jonesredjoy Developments Limited | Construction | 2005 |
| Jordan Electrical Services Ltd | Construction | 2022 |
| Jotwise Limited | Information & communication | 2025 |
| Jourj Property Rentals Limited | Households | 2018 |
| Joyce & Reddington Holdings Limited | Construction | 1999 |
| JP Alloys (Midlands) Limited | Manufacturing | 2025 |
| JPC Property Solutions Ltd | Households | 2022 |
| JRS Facade Design Limited | Construction | 2025 |
| JS Builder & Contractor Ltd | Construction | 2026 |
| JS Projects and Contracting Ltd | Professional & scientific | 2025 |
| JSD Surveying Services Limited | Administrative & support | 2014 |
| JSJ Virtual Clerk-Ish Ltd | Professional & scientific | 2024 |
| JSM Installations Ltd | Construction | 2025 |
| Jsmay Ltd | Real estate | 2023 |
| JSN Rejuvenates Properties Ltd | Real estate | 2024 |
| JT Electrical Services (Midlands) Ltd | Manufacturing | 2026 |
| JT Health Solutions Limited | Health & social care | 2020 |
| Jtplumbing + GAS Services Ltd | Construction | 2022 |
| JTT Express Limited | Professional & scientific | 2010 |
| Jtwkw Ltd | Construction | 2015 |
| Jubilee Development Solutions Ltd | Construction | 2024 |
| Juliet TT Holdings Ltd | Professional & scientific | 2024 |
| Juliet TT Investments Ltd | Professional & scientific | 2024 |
| Junio Investments | Professional & scientific | 2023 |
| Just Another Accountancy Company Limited | Professional & scientific | 2022 |
| Just Blinds Holdings Ltd | Financial services | 2025 |
| Just Blinds Limited | Other services | 2010 |
| Just Blinds Midlands Limited | Extraterritorial | 2022 |
| Just Blinds Staffordshire Limited | Extraterritorial | 2022 |
| Just Luxury Flooring Limited | Wholesale & retail | 2024 |
| Just One Call Limited | Extraterritorial | 2000 |
| Justingwill Ltd | Professional & scientific | 2014 |
| JW Coaching & Competition Ltd | Arts & recreation | 2024 |
| JW Decor Limited | Construction | 2018 |
| JW Environmental Services Ltd. | Professional & scientific | 2017 |
| JWB International Consultants Ltd | Professional & scientific | 2020 |
| JWS Home and Property Services Limited | Construction | 2022 |
| JWW Technology Ltd | Information & communication | 2021 |
| JXC Property Limited | Real estate | 2023 |
| JZ & JZ Property Group Limited | Financial services | 2026 |
| JZ & JZ Property Holdings Ltd | Real estate | 2026 |
| JZ & JZ Property Rentals Ltd | Real estate | 2026 |
| K a Wright Limited | Construction | 2003 |
| K H Building Services (Cannock) Limited | Construction | 2016 |
| K Hill Construction Ltd | Construction | 2018 |
| K M Site Solutions Limited | Construction | 2017 |
| K P B Installations Limited | Construction | 2003 |
| K R Heating Ltd | Construction | 2025 |
| K&A Plumbing Services Ltd | Construction | 2024 |
| K&B Construction Limited | Construction | 2011 |
| K&D Freight Ltd | Transport & logistics | 2023 |
| K. Buckland Construction Limited | Construction | 2014 |
| K. G. L. Investments Limited | Construction | 1990 |
| K.E.B.P Ltd | Real estate | 2024 |
| K.G.L. (Estates) Limited | Real estate | 1978 |
| K.G.L. (Holdings) Limited | Construction | 1993 |
| K.T.D. (West Midlands) Limited | Construction | 2000 |
| K7 Alpina Limited | Real estate | 2025 |
| K9 Art Photography Limited | Agriculture & fishing | 2022 |
| K9 Petshop Limited | Wholesale & retail | 2016 |
| KAB Financial Services Limited | Professional & scientific | 2012 |
| Kabisa Solutions Ltd | Wholesale & retail | 2014 |
| KAL Technology Limited | Manufacturing | 2011 |
| Kaltech Engineering Services Limited | Financial services | 2020 |
| Kandco Envosave Limited | Wholesale & retail | 2012 |
| KAR Construction Ltd | Construction | 2024 |
| KAR Estates Ltd | Real estate | 2025 |
| Karapoppu Ltd | Wholesale & retail | 2024 |
| Karls Transport Management System Limited | Information & communication | 2026 |
| Katie's Brides Limited | Wholesale & retail | 2020 |
| Katrina Robinson Pubs Ltd | Hospitality | 2024 |
| Kavaii Ltd | Education | 2024 |
| KD Consulting and Coaching Ltd | Professional & scientific | 2019 |
| KDS Properties Investment Limited | Real estate | 2025 |
| Keable Homes Lettings Limited | Real estate | 2003 |
| Keable Homes Limited | Real estate | 2017 |
| Keates Property Limited | Real estate | 2025 |
| Kecm Ltd | Wholesale & retail | 2022 |
| Keenfinish Limited | Extraterritorial | 1992 |
| KEG and Comfort Limited | Hospitality | 2017 |
| Keido Ltd | Information & communication | 2012 |