| Ivory and Violet Ltd | Wholesale & retail | 2018 |
| IVY Close Management Company Limited | Real estate | 2014 |
| J & D Holdings (Midlands) Ltd | Professional & scientific | 2008 |
| J & G Builders (Design Contractors) Ltd | Construction | 2004 |
| J & J Plastering Holdings Limited | Financial services | 2019 |
| J B Maintanence Ltd | Construction | 2014 |
| J Shepherd Roofing Ltd | Construction | 2024 |
| J&M Electrical Supplies Limited | Wholesale & retail | 2001 |
| J.E.S Engineering & Maintenance Ltd | Construction | 2021 |
| Jack O'Malley Independent Funerals Ltd | Other services | 2017 |
| Jack Price Limited | Manufacturing | 2016 |
| Jack Thomas Photography Ltd | Professional & scientific | 2025 |
| James Clelland Property Ltd | Real estate | 2023 |
| Jaminns Limited | Arts & recreation | 2008 |
| Jason Beeson Ltd | Construction | 2019 |
| JB Instalations Ltd | Professional & scientific | 2023 |
| JB Site Installation Ltd | Construction | 2026 |
| JC Westley Ltd | Construction | 2025 |
| JDP Automotive Ltd | Wholesale & retail | 2022 |
| JDR Branding Ltd | Administrative & support | 2017 |
| Jennie B Leicester Limited | Manufacturing | 2019 |
| Jenway Property Limited | Real estate | 2020 |
| JF Agilesoftware Ltd | Information & communication | 2023 |
| Jgjse Consultancy Limited | Information & communication | 2026 |
| JJ 2020 Limited | Arts & recreation | 2021 |
| JJ House 88 Ltd | Hospitality | 2021 |
| JLS Contracting Ltd | Professional & scientific | 2008 |
| JM Camper Accessories Ltd | Wholesale & retail | 2023 |
| JO O’Leary Limited | Professional & scientific | 2016 |
| Joesp Company Ltd | Hospitality | 2025 |
| John Short & SON Ltd | Administrative & support | 2003 |
| Johnserv Limited | Construction | 2012 |
| Jones & Sons Property Sourcing Ltd | Administrative & support | 2023 |
| Jordie Enterprizes Ltd | Hospitality | 2018 |
| Jost Management Services Limited | Administrative & support | 2012 |
| Joyce Project Management Services Limited | Extraterritorial | 2025 |
| JP and SON Solutions Limited | Construction | 2024 |
| JP Company Birmingham Ltd | Hospitality | 2020 |
| JP Hewitt GAS Services Limited | Construction | 2009 |
| JPG Building Services Limited | Construction | 2018 |
| JPK Advanced Practice Ltd | Health & social care | 2022 |
| JQS Consulting Limited | Construction | 2015 |
| JSW Marketing Uniwear Limited | Wholesale & retail | 2015 |
| JTT Electrical Limited | Construction | 2016 |
| JTT Refrigeration Limited | Construction | 2025 |
| Julie Black Accountancy Limited | Professional & scientific | 2014 |
| Just Learning Ltd. | Education | 1993 |
| K & M Ventilation Services Ltd | Manufacturing | 2023 |
| K Lashford Creative Limited | Professional & scientific | 2025 |
| K Systems International Ltd | Manufacturing | 2015 |
| K&E KLC Holdings Limited | Financial services | 2025 |
| Kaizen Carpets Ltd | Wholesale & retail | 2025 |
| Kappion Limited | Construction | 2016 |
| KBF Trailers Limited | Manufacturing | 2011 |
| KDA Practitioner Services Ltd | Health & social care | 2018 |
| Kelly Jane's Preloved Closet Ltd | Wholesale & retail | 2023 |
| Kenttor Landscaping and Building Limited | Administrative & support | 2022 |
| Kenttor Maintenance Services Limited | Construction | 2014 |
| Keon Homes Limited | Real estate | 2018 |
| Kerin Estates Limited | Real estate | 2020 |
| Kevin Doyle & SON Property Maintenance Ltd | Construction | 2019 |
| Kevsfabs Ltd | Manufacturing | 2026 |
| Key Developments (Midlands) Limited | Construction | 2006 |
| Key Developments Homes Limited | Construction | 2025 |
| KGE Holdings Limited | Real estate | 2021 |
| KHF 861 Ltd | Transport & logistics | 2022 |
| Kids First Day Nurseries Limited | Education | 2002 |
| Kids Multiverse Ltd | Financial services | 2018 |
| Kilow Limited | Professional & scientific | 2025 |
| Kinder Nurseries Ltd | Education | 1990 |
| Kindercare (Harrogate) Limited | Education | 1992 |
| Kink Cave Online Ltd | Wholesale & retail | 2025 |
| Kolkem Limited | Professional & scientific | 2018 |
| KR3 Engineering Ltd | Construction | 2016 |
| Kube Design Solutions Ltd | Professional & scientific | 2020 |
| L and L Industrial Limited | Wholesale & retail | 2024 |
| L.D.R Carpentry Limited | Manufacturing | 2016 |
| LA Midlands Property Limited | Real estate | 2025 |
| LAA Performance Ltd | Professional & scientific | 2025 |
| Lake Groundworks & Civils Ltd | Construction | 2025 |
| Lanbuilder Limited | Information & communication | 2002 |
| Lance Capital Limited | Real estate | 2021 |
| Large Format Plotters Limited | Information & communication | 2008 |
| Lariot Europe Limited | Manufacturing | 2009 |
| LAURENWILLIAMS67 Ltd | Arts & recreation | 2021 |
| LCH Grainger Property Ltd | Real estate | 2023 |
| LDS Electrical Ltd | Construction | 2023 |
| Legacy Commercial Consulting Limited | Professional & scientific | 2016 |
| Leluna Boutique Ltd | Wholesale & retail | 2022 |
| LEO Wright Studios Ltd | Information & communication | 2024 |
| Let's Grow MJC Limited | Information & communication | 2023 |
| Liam Smith Coaching Ltd | Arts & recreation | 2022 |
| Liam Smith TCG Limited | Wholesale & retail | 2026 |
| Lichfield Building Contractors Limited | Construction | 2013 |
| Lichfield Fires and Fireplaces Ltd | Wholesale & retail | 2025 |
| Lichfield Group Services Ltd | Construction | 2022 |
| Lifestyleloansuk Limited | Financial services | 2013 |
| Lingards Installations Limited | Construction | 2018 |
| Linkwaste Limited | Extraterritorial | 1998 |
| Lions DEN Sourcing and Consultancy Limited | Professional & scientific | 2022 |