| Jhre Limited | Real estate | 2021 |
| JIM Littlehales Steadicam Limited | Administrative & support | 2001 |
| Jinja Beer Company Limited | Hospitality | 2013 |
| JJ Donovan Freight Forwarders Limited | Transport & logistics | 2015 |
| JJ Manpower Limited | Administrative & support | 2020 |
| JJP Healthcare Limited | Wholesale & retail | 2009 |
| Jjrs 1956 Limited | Hospitality | 2025 |
| JJX Limited | Financial services | 2016 |
| JJX Storage Limited | Transport & logistics | 2015 |
| JK Digital Consultant Limited | Administrative & support | 2024 |
| JK Opticians Ltd | Health & social care | 2010 |
| JKR Automotive Services Ltd | Other services | 2016 |
| JKZ24/7 Ltd | Wholesale & retail | 2025 |
| JL Electrical Midlands Ltd | Construction | 2025 |
| JL Legacy Limited | Real estate | 2025 |
| JLB Boiler Services Ltd | Construction | 2010 |
| JM Autos Stourbridge Ltd | Wholesale & retail | 2024 |
| JMB Property Services Ltd | Construction | 2026 |
| JME Homes Limited | Construction | 2020 |
| JME Homes Rentals Limited | Real estate | 2025 |
| Jmps Group Limited | Real estate | 2026 |
| JMS Accountants Limited | Professional & scientific | 2015 |
| JMS Building & Roofing Specialists Ltd | Construction | 2009 |
| JN Investment Partners Ltd | Information & communication | 2023 |
| JO Hobbs Garden Design Limited | Professional & scientific | 2021 |
| John Hall and Company of Stourbridge Limited | Professional & scientific | 1964 |
| Johnson & Powell Limited | Wholesale & retail | 2020 |
| Johnson Porter Industrial Services Limited | Manufacturing | 1999 |
| JON Kirkham Specialist Cars Ltd | Wholesale & retail | 2024 |
| Jonathan LEE Contracts Limited | Administrative & support | 1993 |
| Jonathan LEE Design Services Limited | Administrative & support | 1978 |
| Jonathan LEE Recruitment Limited | Administrative & support | 1999 |
| Jonathan LEE Support Services Limited | Administrative & support | 2021 |
| Jonathan LEE Workforce Solutions Limited | Administrative & support | 2020 |
| Jones & Company (West Midlands) Limited | Professional & scientific | 2001 |
| Joppitt Management Limited | Extraterritorial | 2018 |
| Joseph & Jessica Hair Atelier Limited | Other services | 2025 |
| Josh Wood Lighting Limited | Arts & recreation | 2019 |
| Jotom Consultancy Ltd | Professional & scientific | 2026 |
| Jovan Limited | Health & social care | 2022 |
| JP Quality Services Ltd | Professional & scientific | 2019 |
| JPA Admin Services Limited | Financial services | 2021 |
| JPA Paraplanning Limited | Financial services | 2021 |
| JPB Developments & Holdings Ltd | Administrative & support | 2023 |
| JPB Pubs Ltd | Hospitality | 2025 |
| Jpdfit Ltd | Health & social care | 2026 |
| JPE Construction Solutions Limited | Construction | 2018 |
| JPM Broking Services Limited | Financial services | 2021 |
| JPM UK Solutions Ltd | Financial services | 2025 |
| JPM UK Trade Ltd | Financial services | 2024 |
| JPP Landscapes Ltd | Administrative & support | 2022 |
| JR Detailing Limited | Other services | 2019 |
| JR Heating Solutions Ltd | Construction | 2019 |
| JR Inspection Services Ltd | Professional & scientific | 2021 |
| JRD Estates Limited | Real estate | 2016 |
| JRD Estates Management Limited | Real estate | 2019 |
| JRD Legal Limited | Professional & scientific | 2017 |
| JRN Financial Ltd | Financial services | 2022 |
| JRW (Holdings) Limited | Professional & scientific | 2003 |
| JRW Risk Solutions Limited | Financial services | 2016 |
| JS Fuels Limited | Wholesale & retail | 2024 |
| JS Obrien Business Solutions Ltd | Administrative & support | 2018 |
| Jscr Publishing Limited | Information & communication | 2010 |
| JSD Services Ltd | Administrative & support | 2025 |
| JSE Distributions Ltd | Wholesale & retail | 2026 |
| JSH Properties Ltd | Real estate | 2021 |
| Jtbw Limited | Manufacturing | 2020 |
| Jtek Management Group Limited | Real estate | 2022 |
| JTP Consulting Ltd | Professional & scientific | 2023 |
| Ju-A Limited | Wholesale & retail | 2007 |
| Julu Bubble Tea Ltd | Hospitality | 2026 |
| Junaid and Arwa Ltd | Hospitality | 2025 |
| Juniper Systems Limited | Wholesale & retail | 2013 |
| Junk RAT Apparel Ltd | Administrative & support | 2017 |
| Just Boxt Ltd | Wholesale & retail | 2026 |
| Just Coach Ipda Ltd | Administrative & support | 2021 |
| Just Orders Ltd | Other services | 2020 |
| JVH Maintenance Ltd | Manufacturing | 2009 |
| JVM Property Management Ltd | Hospitality | 2023 |
| Jvmb Properties Limited | Real estate | 2024 |
| JW GAS and Plumbing Services Ltd | Construction | 2021 |
| JWB Innovations Ltd | Wholesale & retail | 2024 |
| JWC Financial Solutions Ltd | Financial services | 2012 |
| K & a Assets Limited | Real estate | 2018 |
| K & P Refurb Limited | Construction | 2011 |
| K B Nash Supermarket Limited | Wholesale & retail | 2024 |
| K D Property Maintenance Limited | Real estate | 2006 |
| K Kular Limited | Health & social care | 2011 |
| K M Burns Psychology Ltd | Health & social care | 2024 |
| K Smith & Associates Limited | Construction | 2014 |
| K Tech Motor Repairs Ltd | Wholesale & retail | 2026 |
| K&S Seating Services Limited | Manufacturing | 2026 |
| K. Bassam Jewellery Services Limited | Wholesale & retail | 2011 |
| K.D.S. Engineering Limited | Manufacturing | 1984 |
| K.H. Bathrooms Limited | Construction | 2006 |
| K.R.P. Supplies Limited | Wholesale & retail | 2000 |
| K1 Mobile Shop Ltd | Wholesale & retail | 2023 |
| K2 Advanced Training Ltd | Administrative & support | 2013 |
| K2 Corporate Holdings Limited | Financial services | 2025 |
| K2 Services Limited | Administrative & support | 2007 |