| JP Aerospace Ltd | Manufacturing | 2016 |
| JP Cardwell Investments Limited | Real estate | 2026 |
| JP Coaching Limited | Health & social care | 2020 |
| JP Glass Hotel Interiors (UK) Ltd | Financial services | 2022 |
| JP NO1 Limited | Financial services | 2019 |
| JP O'Boyle Limited | Health & social care | 2010 |
| Jpatterns Limited | Wholesale & retail | 2023 |
| JPB Events Ltd | Professional & scientific | 2016 |
| JPG Property Ltd | Real estate | 2024 |
| JPH Mobile Services Ltd | Construction | 2018 |
| JPI Global Limited | Information & communication | 2026 |
| JPI Law Limited | Administrative & support | 2018 |
| Jpln Limited | Health & social care | 2019 |
| JQ Consult Ltd | Information & communication | 2025 |
| JR Aero Services Ltd | Professional & scientific | 2014 |
| JR Logistics Ltd | Transport & logistics | 2024 |
| JR Pro Logistics Ltd | Transport & logistics | 2025 |
| JR Residential Investments Limited | Real estate | 2019 |
| JR Roof Top Windows & Joinery Limited | Construction | 2022 |
| JRA Property Limited | Real estate | 2022 |
| JRC Design Limited | Professional & scientific | 2020 |
| JRE Jazz Productions Limited | Information & communication | 2018 |
| JRF Global Holdings Limited | Construction | 2024 |
| JRG Financial Planning Ltd | Financial services | 2017 |
| Jrhk Holdings Ltd | Financial services | 2019 |
| JRL Endo Ltd | Health & social care | 2019 |
| Jrmj Limited | Wholesale & retail | 2018 |
| JRS Germany Ltd | Financial services | 2024 |
| JRS Validation Limited | Manufacturing | 2026 |
| Jrshirley Ltd | Wholesale & retail | 2024 |
| JRT Haulage Ltd | Transport & logistics | 2019 |
| JS (BEL) Ltd | Other services | 2014 |
| JS Community Companion Services Ltd | Health & social care | 2025 |
| JS Construction (2022) Ltd | Construction | 2022 |
| JS Construction (N.I.) Limited | Construction | 2024 |
| JS Property and Land Ltd | Real estate | 2023 |
| JS Rental Properties Ltd | Real estate | 2024 |
| JS7 Limited | Real estate | 2024 |
| JSD Training Solutions Ltd | Education | 2020 |
| Jsni Ltd | Construction | 2015 |
| JSP Engineering Ltd | Manufacturing | 2019 |
| JSP Hire & Metalworks Ltd | Manufacturing | 2020 |
| JSR Homes & Developments Ltd | Construction | 2001 |
| JSR Homes Ltd | Construction | 2007 |
| JSS Bar Grill and Cookery School Limited | Hospitality | 2016 |
| JSS Management Services Ltd | Real estate | 2021 |
| JSS Restaurant Services Limited | Hospitality | 2013 |
| Jsten Limited | Financial services | 2014 |
| JSV Roofing and Property Solutions Ltd | Construction | 2026 |
| Jszzon Limited | Manufacturing | 2024 |
| JT Commercial Transport & Logistics Ltd | Transport & logistics | 2013 |
| JT Contracts Ltd | Manufacturing | 2018 |
| Jtam Ltd | Financial services | 2015 |
| JTE Engineering Ltd | Administrative & support | 2018 |
| Jtelectricalni Ltd | Construction | 2025 |
| Jtiyane Limited | Wholesale & retail | 2025 |
| JTJ Law Limited | Professional & scientific | 2026 |
| Jtkryd Ltd | Wholesale & retail | 2024 |
| JTN Creative Limited | Information & communication | 2024 |
| Jtscrooms Limited | Real estate | 2020 |
| Juanita Perae Ltd | Manufacturing | 2024 |
| Jubilee Developments Management Limited | Extraterritorial | 2004 |
| Jubilee Road Management Company Limited | Households | 2024 |
| Jude Cassidy Textiles Limited | Manufacturing | 2020 |
| Jude James Property Ltd | Real estate | 2025 |
| Jude Quinn Art Ltd | Wholesale & retail | 2025 |
| Judith Hinds Hairdressing Ltd | Other services | 2021 |
| Judith Mcspadden Coaching Ltd | Information & communication | 2024 |
| JUE Prayses Ltd | Wholesale & retail | 2021 |
| Jufox Limited | Wholesale & retail | 2024 |
| Juice JAR Portrush Ltd | Hospitality | 2024 |
| Juicy Sunny Limited | Wholesale & retail | 2025 |
| Julie Scenic Artist Limited | Arts & recreation | 2022 |
| Julie's Kitchen Express Limited | Hospitality | 2018 |
| Julni Limited | Wholesale & retail | 2023 |
| Julum Trading Ltd | Wholesale & retail | 2023 |
| JULY26 Property Limited | Construction | 2025 |
| Jumayev Babajan Limited | Wholesale & retail | 2024 |
| Jumeile Trading Co Limited | Wholesale & retail | 2026 |
| Jumjack Limited | Manufacturing | 2023 |
| Jump Developments Limited | Construction | 2012 |
| Jump Jiggle and Jive Limited | Arts & recreation | 2013 |
| Jump UP Trade Ltd | Wholesale & retail | 2024 |
| Jump WIN Tech Limited | Wholesale & retail | 2024 |
| Jumping Jacks Hire Limited | Arts & recreation | 2021 |
| JUN Wearing Limited | Wholesale & retail | 2024 |
| June and Jimmy Limited | Wholesale & retail | 2017 |
| June Properties Limited | Real estate | 2010 |
| Junide Hardware Limited | Manufacturing | 2023 |
| Juniper Propertyco Holdco Limited | Arts & recreation | 2020 |
| Juno Associates Ltd | Construction | 2008 |
| Juno Planning & Environmental Limited | Professional & scientific | 2011 |
| Juno X Ltd | Professional & scientific | 2018 |
| Jupsk Technology Company Limited | Wholesale & retail | 2025 |
| Jura Investments | Financial services | 2014 |
| Jura Properties Limited | Extraterritorial | 2000 |
| Jurassic Park Limited | Information & communication | 2022 |
| Juris Mediation & Arbitration Ltd. | Professional & scientific | 2015 |
| Jusstuff Limited | Wholesale & retail | 2023 |
| Just Dental Marketing Ltd | Professional & scientific | 2014 |