| JLD Cleans Ltd | Administrative & support | 2026 |
| Jlda Limited | Arts & recreation | 2022 |
| JLE Capital Ltd | Financial services | 2022 |
| JLJ Dorset Ltd | Real estate | 2017 |
| Jlls Holdings Limited | Professional & scientific | 2017 |
| JLP Marketing Ltd | Information & communication | 2021 |
| JLR Sheq Consultancy Ltd | Professional & scientific | 2026 |
| JLS Promotions Limited | Arts & recreation | 2020 |
| JM Consultants & Engineers Limited | Professional & scientific | 2011 |
| JM Estates Ltd | Real estate | 2025 |
| JM Plumbing Services (Bournemouth) Ltd | Construction | 2019 |
| JMA Simba Limited | Professional & scientific | 2020 |
| JMC Assets Ltd | Construction | 2017 |
| Jmch Capital Limited | Construction | 2026 |
| JME Energy Ltd | Construction | 2023 |
| Jmgb Services Ltd | Administrative & support | 2024 |
| Jmlb Ltd | Financial services | 2025 |
| JMM Group Ltd | Professional & scientific | 2018 |
| Jmplacemats Ltd | Manufacturing | 2022 |
| Jmrs Developments Ltd | Construction | 2025 |
| Jmrs Roofing Ltd | Construction | 2025 |
| Jmrsgroup Limited | Construction | 2024 |
| JMS (BH) Ltd | Education | 2025 |
| JMS Properties Group Ltd | Real estate | 2025 |
| JMS Services (UK) Ltd | Real estate | 2013 |
| JMS Services 3 (UK) Limited | Real estate | 2022 |
| JMW Electrical Services (Bournemouth) Limited | Construction | 2013 |
| JNJ Real Estate Ltd | Real estate | 2016 |
| JNK Animal Byproducts Limited | Manufacturing | 2014 |
| JNM Electrical Limited | Construction | 2018 |
| JNS Property Group Ltd | Real estate | 2023 |
| JNV Business Services Ltd | Administrative & support | 2019 |
| JO & JEC (South) Limited | Construction | 2024 |
| JO Manuel Productions Limited | Information & communication | 1990 |
| JO Stephens Fitness Limited | Other services | 2020 |
| Jo's Accountancy Services Ltd | Professional & scientific | 2017 |
| Joanimator Ltd | Arts & recreation | 2022 |
| Jobshop UK Ltd | Administrative & support | 1997 |
| Jobtrust Limited | Administrative & support | 2000 |
| Joclub Lettings Ltd | Real estate | 2018 |
| John Balaam Limited | Real estate | 1947 |
| John Beauchamp & Co. Limited | Construction | 1961 |
| John Beavis Associates Limited | Professional & scientific | 2015 |
| John Beckett Ltd | Professional & scientific | 2018 |
| John Brant Limited | Information & communication | 2002 |
| John Carlin Ltd | Professional & scientific | 2023 |
| John Carter and SON (Salisbury) Limited | Wholesale & retail | 1981 |
| John Hogan Logistics Limited | Professional & scientific | 2017 |
| John M Lynch Knee Solutions Limited | Health & social care | 2025 |
| John Marlborough Limited | Real estate | 2017 |
| John Newman Carpets & Vinyl Ltd | Other services | 2015 |
| John O'Donnell & Co Ltd | Professional & scientific | 2012 |
| John UK Trans Ltd | Construction | 2025 |
| Johnson & Cole Ltd | Transport & logistics | 2009 |
| Johnson Birr Ltd | Real estate | 2008 |
| Johzee Limited | Hospitality | 2023 |
| Jojami Limited | Real estate | 2002 |
| Jojo Commerce Ltd | Professional & scientific | 2021 |
| Jokile Transport Ltd | Transport & logistics | 2026 |
| Joleon Property Holdings Limited | Financial services | 2019 |
| Joli Properties Limited | Real estate | 2015 |
| Jolley Puffin Ltd | Real estate | 2024 |
| Jolliffe Assurancy Services Ltd. | Professional & scientific | 2015 |
| Jomafe (UK) Ltd | Wholesale & retail | 2020 |
| Jomo Wines Ltd | Wholesale & retail | 2020 |
| Jonathan Modley Limited | Information & communication | 2018 |
| Jonathan Purt Revenues and Benefits Consultants Limited | Administrative & support | 2006 |
| Jones (UK) Limited | Extraterritorial | 2023 |
| Jones Vision Solutions Ltd | Information & communication | 2019 |
| Jose & Sons (New Milton) Limited | Construction | 1963 |
| Jose Brock Ltd | Financial services | 2021 |
| Joshua Clement Coaching Ltd | Health & social care | 2026 |
| Joshua Curtis Design Ltd | Information & communication | 2022 |
| Joule Heating Limited | Construction | 2023 |
| Journey Graphics Limited | Manufacturing | 2020 |
| Joy Malyon Consultancy Limited | Professional & scientific | 2020 |
| Joy Project Solutions Ltd | Information & communication | 2014 |
| Joya Aesthetics Limited | Health & social care | 2024 |
| Joyacres Park Limited | Agriculture & fishing | 2009 |
| Joyner Cosmetics Limited | Administrative & support | 2024 |
| JP Estates Holdings Limited | Real estate | 2023 |
| Jparch Ltd | Wholesale & retail | 2021 |
| JPD Consultancy Services Ltd | Extraterritorial | 2012 |
| Jpgt Ltd | Transport & logistics | 2017 |
| JPK Ltd | Wholesale & retail | 2023 |
| JPR Partners Limited | Other services | 2024 |
| Jqbanjo Ltd | Arts & recreation | 2026 |
| JR Maintenance Solutions Ltd | Extraterritorial | 2022 |
| JRS Finance Group Limited | Financial services | 2021 |
| Jrsj Holdings Limited | Financial services | 2025 |
| JRV Glow Limited | Wholesale & retail | 2023 |
| JS Care 4 ALL Ltd | Health & social care | 2022 |
| JS Legal Consultancy Ltd | Professional & scientific | 2025 |
| JSF Industries Limited | Extraterritorial | 2015 |
| JSI Group Ltd | Construction | 2025 |
| JSJ GAS Limited | Construction | 2001 |
| JSK Products Limited | Wholesale & retail | 2026 |
| JSL Engineering Ltd | Manufacturing | 2009 |
| JT Pro Advisory Ltd | Professional & scientific | 2026 |
| Jt's Blinds Limited | Wholesale & retail | 2018 |