| Jata Services Ltd | Construction | 2025 |
| Jatoris Limited | Wholesale & retail | 2004 |
| Javro Limited | Real estate | 2026 |
| JAY JAY UK Private Limited | Administrative & support | 2023 |
| JAY Nepal Cinema Limited | Financial services | 2016 |
| JAY Scott Limited | Other services | 2019 |
| Jayankur Properties Ltd | Real estate | 2021 |
| Jayann Pride Ltd | Professional & scientific | 2008 |
| Jaylex Ltd | Professional & scientific | 2012 |
| Jaytree Investments Limited | Administrative & support | 2013 |
| Jazi Electric Ltd | Construction | 2026 |
| Jazmine Holdings Limited | Financial services | 2025 |
| Jazmine Properties Limited | Real estate | 2021 |
| JB Financial Consultancy Limited | Professional & scientific | 2024 |
| JB Global Consulting Ltd | Professional & scientific | 2018 |
| JB Properties 88 Baxendale Limited | Real estate | 2020 |
| JB Properties Investments Limited | Real estate | 2020 |
| JB Properties South Limited | Real estate | 2020 |
| JB Video Limited | Information & communication | 2014 |
| JB2KH C Limited | Real estate | 2023 |
| JB2KH D Limited | Real estate | 2024 |
| JB2KH Limited | Real estate | 2021 |
| JB2KH Management Limited | Real estate | 2023 |
| JBD Travel Ltd | Administrative & support | 2023 |
| Jbec Property Limited | Real estate | 2022 |
| JBI Direct Ltd | Wholesale & retail | 2024 |
| JBO Construction Ltd | Construction | 2017 |
| Jcdr Holdings Limited | Real estate | 2016 |
| Jcpictures Ltd | Information & communication | 2016 |
| JCR Construction Services Ltd | Construction | 2022 |
| JD Office Paper Mart Ltd | Wholesale & retail | 2013 |
| JD Rigging Ltd | Construction | 2023 |
| JDA Associates Limited | Information & communication | 2001 |
| Jdee Properties Limited | Real estate | 2021 |
| Jdja Holdco Limited | Financial services | 2025 |
| JDL Property Ventures Limited | Real estate | 2026 |
| Jdlc Properties Ltd | Real estate | 2022 |
| Jdmh Properties Limited | Real estate | 2025 |
| JDR Homes Bushey Ltd | Administrative & support | 2026 |
| JDR Homes Ltd | Construction | 2024 |
| JDR Office Group Limited | Administrative & support | 2006 |
| JDR Property Group Limited | Administrative & support | 2014 |
| JDS (Walthamstow) Limited | Real estate | 2017 |
| JDS Properties Limited | Real estate | 2013 |
| JDS Property Group Limited | Real estate | 2016 |
| JE Building Care Ltd | Construction | 2018 |
| JE Distribution Ltd | Hospitality | 2020 |
| Jean Marie Properties Limited | Real estate | 2019 |
| Jean Pound Limited | Arts & recreation | 2015 |
| Jeart Build Ltd | Construction | 2025 |
| Jeart Investment Properties Ltd | Real estate | 2019 |
| Jeestnet Limited | Information & communication | 2019 |
| Jeff Facta Limited | Professional & scientific | 2017 |
| Jeffries Renovations Ltd | Manufacturing | 2025 |
| JEG Holdings Limited | Construction | 2012 |
| Jehu-Cal Limited | Wholesale & retail | 2017 |
| Jekyll & Hyde London Ltd | Arts & recreation | 2021 |
| Jellis Property Management Limited | Real estate | 2024 |
| JEN Interiors & Properties Ltd. | Construction | 2022 |
| Jessmik Investments Limited | Construction | 1964 |
| JET Scaffolding Ltd | Construction | 2009 |
| JET Van and MAN Service Limited | Transport & logistics | 2025 |
| Jetcourt Limited | Real estate | 2012 |
| Jetronics Computers Limited | Information & communication | 2012 |
| Jevenor Limited | Real estate | 2003 |
| Jewellery Management Company Limited | Wholesale & retail | 2014 |
| Jewellery Replacement Claims Limited | Other services | 2022 |
| Jewels & Stone Music Limited | Arts & recreation | 2007 |
| Jewish Organ Donation Ltd | Health & social care | 2020 |
| JF Media Services Ltd | Wholesale & retail | 2025 |
| JFC Systems Thinking Limited | Professional & scientific | 2011 |
| JFK Property Limited | Real estate | 2018 |
| JFM Medical Ltd | Health & social care | 2018 |
| JG Fulfillment Ltd | Wholesale & retail | 2019 |
| JH Taxi Services Limited | Transport & logistics | 2019 |
| JIA Design Works Ltd | Information & communication | 2018 |
| JIF Pro Ltd | Financial services | 2024 |
| Jigsaw Global Events Limited | Arts & recreation | 2018 |
| Jigsaw Interiors Limited | Wholesale & retail | 2019 |
| JIM Athleisure Ltd | Wholesale & retail | 2019 |
| Jimmie Lennon TV Ltd | Arts & recreation | 2019 |
| Jiva Film Limited | Other services | 1993 |
| Jivacura Ltd | Health & social care | 2025 |
| JJ & Team 2 Limited | Hospitality | 2021 |
| JJ & Team Limited | Hospitality | 2010 |
| JJ Film Productions Ltd | Administrative & support | 2023 |
| JJ General Contractors Ltd | Construction | 2021 |
| JJ Medicine & Endocrinology Ltd | Health & social care | 2025 |
| JJ Reddington Limited | Extraterritorial | 2009 |
| Jj&T PFB Ltd | Hospitality | 2025 |
| Jjab Limited | Professional & scientific | 2019 |
| JJJ (Freeholds) Limited | Administrative & support | 2014 |
| JJL Rights Limited | Other services | 2012 |
| JJS Surveying Limited | Information & communication | 2020 |
| JK Property Care Ltd | Real estate | 2024 |
| Jkle Ltd | Professional & scientific | 2020 |
| JLA Glasgow Limited | Professional & scientific | 2018 |
| JLC Capital Limited | Administrative & support | 2019 |
| Jlsc Associates Limited | Arts & recreation | 2021 |
| JLW Film Ltd | Information & communication | 2024 |