| JH Properties MCR Ltd | Real estate | 2025 |
| Jhair Limited | Wholesale & retail | 2023 |
| Jiahe Trading Ltd | Wholesale & retail | 2020 |
| Jidist Ltd | Professional & scientific | 2023 |
| Jigsaw Facilities Limited | Administrative & support | 2015 |
| Jiink Ltd | Manufacturing | 2024 |
| Jimklean Services Limited | Administrative & support | 2021 |
| JJ Lyons Limited | Real estate | 2016 |
| JJR GAS UK Ltd | Construction | 2023 |
| JK Haulage Services Ltd | Transport & logistics | 2015 |
| JK Landscapes Limited | Administrative & support | 2025 |
| JKB Supplies Ltd | Construction | 2026 |
| Jkmk Properties Ltd | Real estate | 2026 |
| JKYANZI52 Ltd | Health & social care | 2023 |
| JL Property Move Ltd | Real estate | 2022 |
| JLB Business Ltd | Manufacturing | 2023 |
| Jlhub Ltd | Real estate | 2023 |
| JM 10 Nautica Ltd | Arts & recreation | 2019 |
| Jm&L Estates Ltd | Real estate | 2026 |
| Jmar Properties Ltd | Real estate | 2023 |
| JMB Stones Limited | Real estate | 2014 |
| JMC Bolton Limited | Construction | 2017 |
| JMC Investments Ltd | Real estate | 2021 |
| JMD SPV1 Limited | Real estate | 2026 |
| JME Props Ltd | Information & communication | 2017 |
| Jmgf Properties Ltd | Real estate | 2025 |
| JMR Private Ltd | Wholesale & retail | 2017 |
| JMW Care and Logistics Ltd | Health & social care | 2023 |
| JNE Global Limited | Wholesale & retail | 2016 |
| JO JO Foods Ltd | Hospitality | 2023 |
| JO Local Limited | Hospitality | 2026 |
| Jobsecta Ltd | Administrative & support | 2024 |
| JOE Ward Accountancy Ltd | Professional & scientific | 2025 |
| JOG Property Holdings Limited | Real estate | 2023 |
| JOH Care Ltd | Health & social care | 2020 |
| John Binns (Salford) Limited | Real estate | 1951 |
| John Dowd Ltd | Professional & scientific | 2024 |
| Joinery Interiors Limited | Construction | 2025 |
| Jola Consulting Limited | Professional & scientific | 2025 |
| Joll-E Digital Ltd | Information & communication | 2025 |
| Jolly Adaptations Limited | Construction | 2025 |
| Jomix Limited | Wholesale & retail | 2021 |
| Jon&Yan Capital Ltd | Real estate | 2024 |
| Jonathan Ogden Ltd | Arts & recreation | 2022 |
| Jordan Alexander Ltd | Construction | 2023 |
| Jorinsafrik Ltd | Wholesale & retail | 2026 |
| Josala Property Limited | Real estate | 2022 |
| Josam Limited | Real estate | 2017 |
| Josco Investments Ltd | Real estate | 2013 |
| Josef Estate Ltd | Real estate | 2022 |
| Joseph Reeves Ltd | Information & communication | 2025 |
| Joshua Evans Holdings Ltd | Financial services | 2025 |
| Joy Sower Distributions Ltd | Wholesale & retail | 2026 |
| Joyeah Limited | Manufacturing | 2025 |
| JOYFAM148 Ltd | Wholesale & retail | 2024 |
| Joysing Limited | Administrative & support | 2023 |
| JP Bobcat Roofing Limited | Construction | 2022 |
| JP Media Productions Limited | Information & communication | 2022 |
| Jpfk Ltd | Information & communication | 2026 |
| JPK Biomedical Services Limited | Health & social care | 2020 |
| JPS Digital Ltd | Professional & scientific | 2022 |
| JPT Holdings Limited | Professional & scientific | 2025 |
| JR Construction NW Ltd | Construction | 2025 |
| JRB Electrical Limited | Construction | 2014 |
| JRB Windows Ltd. | Manufacturing | 2015 |
| Jrtal Ltd | Professional & scientific | 2025 |
| JSE MAX Consulting Limited | Professional & scientific | 2015 |
| JSM and Co Accountants Ltd | Professional & scientific | 2016 |
| Jspace Design Ltd | Professional & scientific | 2011 |
| JSS Advisors Ltd | Other services | 2024 |
| JSS Trading Ltd | Construction | 2018 |
| JT Inspire Healthcare Ltd | Health & social care | 2019 |
| JTR Property Services Ltd | Other services | 2023 |
| Jtrade Show Ltd | Administrative & support | 2023 |
| Juan Barreto Music Limited | Information & communication | 2025 |
| Jubilee Mill Oldham Ltd | Construction | 2018 |
| Jubilee Way Estates NO. 1 Ltd | Real estate | 2020 |
| Judaica Facsimiles Ltd | Wholesale & retail | 2020 |
| Judaicartz Ltd | Wholesale & retail | 2024 |
| Judson Ltd | Real estate | 2006 |
| Judy House Ltd | Real estate | 2021 |
| Jugadores Ltd | Wholesale & retail | 2020 |
| Juice IT UP Ltd | Wholesale & retail | 2025 |
| Juice VIBES2YOU Ltd | Manufacturing | 2022 |
| Juju's Delicacies Ltd | Manufacturing | 2026 |
| Julia International Limited | Wholesale & retail | 2018 |
| Juliongjonah Limited | Information & communication | 2025 |
| Junipero Limited | Manufacturing | 2020 |
| Junkyard Golf Club (Birmingham) Limited | Arts & recreation | 2022 |
| Junkyard Golf Club Holdings Limited | Financial services | 2025 |
| Just 4 Player Group Ltd | Arts & recreation | 2020 |
| Just Staffed Ltd | Administrative & support | 2025 |
| JVG Enterprises Ltd | Wholesale & retail | 2021 |
| JVW Global Limited | Other services | 2019 |
| JW Alexander Brand Ltd | Manufacturing | 2026 |
| JW Recovery Ltd | Transport & logistics | 2024 |
| JWS Accountants Ltd | Financial services | 2022 |
| JWS Holdings Group Limited | Financial services | 2021 |
| JWS Holdings Limited | Water & waste | 2004 |
| JWS Waste & Recycling Services Limited | Water & waste | 1983 |