| JPS1 Ltd | Information & communication | 2026 |
| JPS1 Properties Ltd | Real estate | 2026 |
| JPT Services Ltd | Professional & scientific | 2025 |
| JR Alloy Wheel Repair Ltd | Wholesale & retail | 2020 |
| JR CONSTRUCTION1 Limited | Construction | 2020 |
| JR Electrical and Services Limited | Construction | 2014 |
| JR Express Logistic Ltd | Transport & logistics | 2025 |
| JR Floors Ltd | Construction | 2023 |
| JR Heating & Plumbing Ltd | Construction | 2011 |
| JR Residential Property Ltd | Construction | 2025 |
| JR Southrow Ltd | Hospitality | 2014 |
| Jram Estates Ltd | Real estate | 2021 |
| Jrcgroup Ltd | Administrative & support | 2017 |
| JRE Capital Limited | Financial services | 2025 |
| JRE Collective Limited | Real estate | 2025 |
| Jreilly Public Freehouses Ltd | Hospitality | 2024 |
| JRK Solution Ltd | Information & communication | 2025 |
| JRM Building Ltd | Construction | 2025 |
| JRM Consultants Limited | Professional & scientific | 2011 |
| JRP AM Ltd | Wholesale & retail | 2025 |
| Jrpmultiple Ltd | Wholesale & retail | 2026 |
| JRR Property Group Limited | Real estate | 2016 |
| Jryl Real Estate Ltd | Real estate | 2021 |
| JS Brennan Construction Limited | Construction | 2013 |
| JS Brennan Developments Ltd | Real estate | 2006 |
| JS Cardiology Services Limited | Health & social care | 2017 |
| JS Green Street Ltd | Hospitality | 2023 |
| JS Media London Ltd | Professional & scientific | 2015 |
| JS Projects & Events Ltd | Professional & scientific | 2016 |
| JS Regen Design Ltd | Manufacturing | 2022 |
| JS Surgical Limited | Health & social care | 2011 |
| JSA Builder Ltd | Construction | 2022 |
| JSB Restaurants Ltd | Hospitality | 2024 |
| Jsdk Limited | Administrative & support | 2025 |
| JSF Domestic Services Limited | Administrative & support | 2012 |
| JSK 247 Ltd | Professional & scientific | 2026 |
| JSK Capital Ltd | Financial services | 2016 |
| JSK Consultants Limited | Administrative & support | 2019 |
| JSK Info Ltd | Information & communication | 2024 |
| JSK IT Consultants Limited | Information & communication | 2015 |
| JSK Motors UK Ltd | Wholesale & retail | 2018 |
| JSK Ventures Ltd | Real estate | 2025 |
| Jskjsn Ltd | Real estate | 2019 |
| JSM 1988 Limited | Real estate | 2019 |
| JSM Family Investment Company Limited | Financial services | 2021 |
| JSM Lighting Ltd | Other services | 2011 |
| JSM Services Ltd | Administrative & support | 2025 |
| Jsmn Info Tech Ltd | Information & communication | 2014 |
| JSN & Ltd | Professional & scientific | 2025 |
| JSN Express Logistics Ltd | Transport & logistics | 2025 |
| JSN Food Ltd | Hospitality | 2026 |
| JSN Heat Supplies Ltd | Wholesale & retail | 2011 |
| JSN Ltd | Wholesale & retail | 2020 |
| JSN Motors Ltd | Wholesale & retail | 2025 |
| JSN Properties Limited | Real estate | 2018 |
| JSN Property Maintenance Ltd | Construction | 2024 |
| JSN Property Services Ltd | Construction | 2024 |
| JSN Retailers Ltd | Wholesale & retail | 2026 |
| JSN System Solutions Limited | Information & communication | 2014 |
| JSP Accountants Limited | Other services | 2006 |
| JSP Tech Limited | Professional & scientific | 2015 |
| Jspark Electrics Ltd | Construction | 2024 |
| JSR Pictures Ltd | Information & communication | 2019 |
| Jstvn Property Ltd | Real estate | 2018 |
| JSV Services Ltd | Professional & scientific | 2014 |
| JT Car Repairs Limited | Wholesale & retail | 2014 |
| JT Dent Limited | Health & social care | 2025 |
| JT Enterprise Limited | Real estate | 2007 |
| JT Fire and Electrical Solutions Ltd | Construction | 2017 |
| JT Oscar Ltd | Real estate | 2021 |
| JT Sushi Ltd | Hospitality | 2022 |
| Jt&N Consultancy Ltd | Information & communication | 2025 |
| JTA Management Limited | Real estate | 2017 |
| JTC (PO) Limited | Wholesale & retail | 2013 |
| JTC Finance Limited | Extraterritorial | 2009 |
| JTC UK Ventures Ltd | Real estate | 2019 |
| JTK Emporium Ltd | Wholesale & retail | 2019 |
| JTM Property Investments Ltd | Real estate | 2023 |
| JTS Consulting Ltd | Professional & scientific | 2023 |
| Jtss Ltd | Construction | 2019 |
| Juan & Prakash London Limited | Wholesale & retail | 2021 |
| Juansuay Thai Therapist Ltd | Other services | 2025 |
| Jubilee International Education Group Limited | Wholesale & retail | 2011 |
| Juciful Fruits Ltd | Wholesale & retail | 2025 |
| Juciful Juices Ltd | Wholesale & retail | 2024 |
| Judd's (Chemists) Limited | Wholesale & retail | 1948 |
| Jude Pharma Ltd | Health & social care | 2025 |
| Judi Estates Ltd | Real estate | 2022 |
| Judjon Limited | Professional & scientific | 2017 |
| Judy Adams Catering Ltd | Hospitality | 2021 |
| Juhudi Ltd | Health & social care | 2018 |
| Juiceandleaf Limited | Manufacturing | 2025 |
| Juicefarm Limited | Hospitality | 2025 |
| Jujhar IT Solutions Limited | Information & communication | 2019 |
| Juju Consulting Ltd | Professional & scientific | 2017 |
| Juju Home Trading Ltd | Hospitality | 2020 |
| Juke Online Ltd | Wholesale & retail | 2020 |
| Jukebox 3.0 Ltd | Other services | 2022 |
| Jules Mechanical Services Ltd | Construction | 2016 |
| Julia Makes Art Limited | Arts & recreation | 2025 |