| JET Falcon LP | | 2016 |
| JET Infosystems International Inc. LP | | 2015 |
| JET Kitchens Ltd | Wholesale & retail | 2018 |
| JET Logic Limited | Transport & logistics | 2009 |
| JET Tila Limited | Hospitality | 2026 |
| JET Trade LP | | 2016 |
| Jeta Transit L.P. | | 2014 |
| Jetbrook Energy L.P. | | 2016 |
| Jetcross L.P. | | 2012 |
| Jetdaq Ltd | Information & communication | 2015 |
| Jetdavbid Limited | Hospitality | 2025 |
| Jetimpex LP | | 2012 |
| Jetix Impex LP | | 2017 |
| Jettix LP | | 2013 |
| Jettock Ltd | Wholesale & retail | 2026 |
| Jetwatch Limited | Construction | 1989 |
| Jetway Partners LP | | 2016 |
| Jewel Contracts Limited | Construction | 2023 |
| Jewel of the Heart Investment Ltd | Professional & scientific | 2025 |
| Jewel-Sky Alliance LP | | 2012 |
| Jewelbank Properties Limited | Professional & scientific | 2008 |
| Jewelia the Day Limited | Wholesale & retail | 2025 |
| Jewellery by Liam Ross Limited | Wholesale & retail | 2018 |
| Jewellery Technology Research (UK) Limited | Manufacturing | 2023 |
| Jewelmine Capital LP | | 2017 |
| Jewish Dispatch Limited | Information & communication | 2020 |
| JF 6 Ltd | Real estate | 2022 |
| JF GEO Consulting Ltd | Administrative & support | 2006 |
| JF Interconnect Limited | Professional & scientific | 2024 |
| JFH Groundworks Ltd | Professional & scientific | 2024 |
| JFK Facility Services Ltd | Administrative & support | 2015 |
| JFK Projects Ltd | Extraterritorial | 2021 |
| JFK UK Property Ltd | Real estate | 2019 |
| JFN Productions Limited | Information & communication | 2018 |
| JFR Projects Limited | Professional & scientific | 2006 |
| Jftt City Ltd | Hospitality | 2022 |
| Jfutech Ltd | Professional & scientific | 2022 |
| Jgck Limited | Information & communication | 2025 |
| JGL Accounting Limited | Professional & scientific | 2010 |
| Jglmsc Limited | Arts & recreation | 2024 |
| JGM Rentals Ltd | Real estate | 2021 |
| JGN Properties Limited | Real estate | 2025 |
| JGW Associates Limited | Extraterritorial | 2004 |
| JH Online Retail Ltd | Wholesale & retail | 2025 |
| JH Property Group Ltd | Real estate | 2022 |
| JH Scaffolding Solutions Ltd | Construction | 2024 |
| JH Storrar Limited | Real estate | 2017 |
| JH Sustainability Ltd | Professional & scientific | 2018 |
| JH Trade Group Ltd | Wholesale & retail | 2025 |
| Jhee Pasa Limited | Hospitality | 2021 |
| Jhjas Ltd | Real estate | 2023 |
| JHM Global Scotland Limited | Other services | 2011 |
| JHM Independent Limited | Financial services | 2023 |
| JHP 23 Limited | Real estate | 2014 |
| JHP Services (Scot) Limited | Construction | 2022 |
| Jhwa Solutions Ltd. | Financial services | 2018 |
| Jian Designs Limited | Manufacturing | 2008 |
| Jian London Limited | Administrative & support | 2014 |
| Jiang NAN Restaurant Limited | Hospitality | 2019 |
| Jianshang Trading Ltd | Wholesale & retail | 2026 |
| Jiaozi Group Ltd | Manufacturing | 2024 |
| Jiating Limited | Extraterritorial | 2011 |
| Jiaxing Property Ltd | Real estate | 2023 |
| Jicc Dbfm Holdco Limited | Financial services | 2017 |
| Jicc Dbfmco Limited | Construction | 2017 |
| Jice Properties Ltd | Real estate | 2024 |
| Jidex Impex LP | | 2016 |
| JIE Kitchen Ltd | Hospitality | 2023 |
| Jieun Property Ltd | Real estate | 2024 |
| Jigsaw Blinds Limited | Manufacturing | 2018 |
| Jigsaw Childcare (UK) Ltd | Health & social care | 2013 |
| Jigsaw Childcare (West) Ltd | Financial services | 2018 |
| Jigsaw Childcare LLP | | 2007 |
| Jigsaw Joiners (Edinburgh) Ltd | Construction | 2019 |
| Jigsaw PR Ltd. | Professional & scientific | 2012 |
| Jill Kerr Physiotherapy Limited | Health & social care | 2019 |
| Jilli Blackwood Limited | Professional & scientific | 2017 |
| JIM & Sheila Ltd. | Manufacturing | 2004 |
| JIM Calder Associates Limited | Professional & scientific | 2010 |
| JIM Dalziel Plumbing and Heating Limited | Construction | 2011 |
| JIM Kerr Management Consultancy Limited | Arts & recreation | 1985 |
| Jimaj Energy Services Limited | Mining & quarrying | 2012 |
| Jimmy Gee's Autos Ltd | Manufacturing | 2021 |
| Jimmy Love Motorsport Ltd | Information & communication | 2018 |
| Jimmy Martin Travel Limited | Administrative & support | 2005 |
| Jimmy Two Guns Scotland Limited | Information & communication | 2023 |
| Jinggeng UK Ltd | Wholesale & retail | 2026 |
| Jinheng Games Limited | Information & communication | 2026 |
| Jinora Consulting Ltd | Professional & scientific | 2025 |
| Jinx Engineering Services Limited | Manufacturing | 2021 |
| JIO Properties Limited | Real estate | 2025 |
| Jiotex Impex LP | | 2017 |
| Jishf Limited | Information & communication | 2017 |
| Jitbit LP | | 2014 |
| Jiuding Takeaway Ltd | Hospitality | 2024 |
| Jive Clinic Ltd | Health & social care | 2025 |
| Jiyaux Ltd | Administrative & support | 2023 |
| JJ & B Group Ltd | Construction | 2026 |
| JJ Chalmers Limited | Other services | 2015 |
| JJ Clearance Edinburgh Ltd. | Water & waste | 2019 |