| JPJ Property Ltd | Hospitality | 2019 |
| JPL Medics Limited | Health & social care | 2002 |
| JPM Aggregates Limited | Real estate | 1985 |
| Jpqs Ltd | Professional & scientific | 2021 |
| JPR Property Limited | Real estate | 2017 |
| JPS Builders Southern Limited | Construction | 2017 |
| JPS Couriers Ltd | Transport & logistics | 2024 |
| JPS Electrical Utilities Contractor Ltd | Manufacturing | 2017 |
| JPS Roofing 247 Ltd | Construction | 2025 |
| JR Abundance Ltd | Wholesale & retail | 2019 |
| JR Co-Living Limited | Real estate | 2023 |
| JR Translations Ltd | Professional & scientific | 2014 |
| JRB Carpentry Ltd | Manufacturing | 2019 |
| JRB Essentials Ltd | Wholesale & retail | 2021 |
| JRB Franchise Limited | Other services | 2015 |
| JRB Hair Limited | Other services | 2017 |
| JRB Hythe Limited | Other services | 2020 |
| JRB Maintenance Ltd. | Administrative & support | 2009 |
| JRB Southampton Limited | Other services | 2017 |
| JRB Transport Limited | Transport & logistics | 2023 |
| JRF Millers Limited | Real estate | 2021 |
| Jrgroves Ltd | Construction | 2023 |
| JRH Management Services Ltd | Professional & scientific | 2014 |
| JRJ Auto Assets Ltd | Administrative & support | 2025 |
| JRJ Auto Mechanics Ltd | Wholesale & retail | 2025 |
| Jroache Ltd | Arts & recreation | 2022 |
| Jrrg Limited | Transport & logistics | 2018 |
| JRV (Hampshire) Ltd | Professional & scientific | 2024 |
| JRV Training Solutions Ltd | Information & communication | 2024 |
| JRW Property Services Limited | Real estate | 2008 |
| JS Computing Solutions Limited | Information & communication | 2019 |
| JS Handling and Storage Ltd | Transport & logistics | 2022 |
| JS Land Management Ltd | Real estate | 2024 |
| JS Landscapes & Groundworks Ltd | Administrative & support | 2021 |
| JS Physio Ltd | Health & social care | 2026 |
| JS Pools Limited | Administrative & support | 2025 |
| JS Properties (GB) Ltd | Real estate | 2012 |
| JS Purbeck Properties Ltd | Households | 2019 |
| JS Rail Consultancy Ltd | Professional & scientific | 2012 |
| JSB Property Management Limited | Real estate | 2017 |
| JSG Developments (SW) Limited | Construction | 2025 |
| JSI Electrical Ltd | Construction | 2016 |
| JSK Baker Roofing Limited | Construction | 2016 |
| Jskt Limited | Real estate | 2025 |
| JSL Technology Consulting Ltd | Information & communication | 2026 |
| JSLHOLDING1 Ltd | Real estate | 2020 |
| JSM Carpentry Ltd | Construction | 2024 |
| Jsmotocycle Limited | Wholesale & retail | 2019 |
| JSP Special Projects Ltd | Wholesale & retail | 2013 |
| JSP Surgical Limited | Health & social care | 2024 |
| JSR Estates (Southampton) Limited | Real estate | 2015 |
| JSR Financial Solutions Ltd | Professional & scientific | 2018 |
| JSR Management & HR Consultancy Services Ltd | Professional & scientific | 2010 |
| JSR Marine Services Ltd | Manufacturing | 2026 |
| Jsrnm Trading Ltd | Wholesale & retail | 2026 |
| JSS Construction and Developments Ltd | Construction | 2020 |
| JST Accountants Limited | Professional & scientific | 2025 |
| JST Property Management Limited | Real estate | 2025 |
| JSV Services (South) Limited | Professional & scientific | 2023 |
| JSY Ltd | Transport & logistics | 2024 |
| JT & RJ Holdings Limited | Financial services | 2026 |
| JT Cleaning Services Ltd | Administrative & support | 2019 |
| JT Groundworks Hampshire Ltd | Construction | 2022 |
| JT Plant Hire Hampshire Ltd | Administrative & support | 2022 |
| Jtbc Holdings Limited | Administrative & support | 2022 |
| JTR Distributions Ltd | Wholesale & retail | 2026 |
| JTS Property Holdings Ltd | Real estate | 2024 |
| Jtsb Limited | Construction | 2024 |
| Jtts Tree Contractors Ltd | Agriculture & fishing | 2021 |
| Jual Burgers Limited | Hospitality | 2024 |
| Jubilee Management Company Limited | Households | 1993 |
| Jubilee Sailing Trust (Tenacious) Limited | Education | 2000 |
| Judd and Partners Limited | Professional & scientific | 1988 |
| Judge & Co Properties Limited | Real estate | 2016 |
| Judge & Co Services Limited | Administrative & support | 2017 |
| Judge Car Rentals Ltd | Transport & logistics | 2024 |
| Judge Trans Ltd | Transport & logistics | 2021 |
| Judrols Ltd | Wholesale & retail | 2025 |
| Juje Limited | Other services | 2018 |
| Jukes Walk Management Company Limited | Other services | 2002 |
| Jules Pads Ltd | Hospitality | 2021 |
| Julia Barbara Crysell Limited | Extraterritorial | 2022 |
| Julia's Care Limited | Health & social care | 2013 |
| Julibalance Ltd | Professional & scientific | 2022 |
| Julie a Davis Photography Limited | Other services | 2014 |
| Julies Dance Ltd | Education | 2016 |
| Juliet Reeves Designs Limited | Wholesale & retail | 2016 |
| Julukae BUR Dubai Ltd | Wholesale & retail | 2026 |
| Jumare Collections Limited | Wholesale & retail | 2025 |
| Jumbo Rolls Ltd. | Manufacturing | 2018 |
| Jumbo Stud Ltd | Construction | 2016 |
| Jumbo Stud Supply Ltd | Construction | 2022 |
| Jumbo Stud Wall Ltd | Construction | 2022 |
| Jumpin' JAX Ltd | Arts & recreation | 2020 |
| Jumpstone International Limited | Professional & scientific | 2021 |
| JUN Ventures Ltd | Administrative & support | 2026 |
| Juna Business Ltd | Other services | 2017 |
| Juna Digital Ltd | Other services | 2021 |
| June's Ltd | Hospitality | 2026 |
| Jungle Jeans Limited | Other services | 2006 |