| JRS Property Solutions Limited | Real estate | 2024 |
| JRS UK Holdings Limited | Wholesale & retail | 2018 |
| JRT Consulting Ltd | Professional & scientific | 2025 |
| JRT Food and Wine Ltd | Wholesale & retail | 2024 |
| JRW Contracts Limited | Construction | 2024 |
| JRW Media Limited | Professional & scientific | 2024 |
| JRW Mentorship Consulting Limited | Professional & scientific | 2024 |
| Jrwb Entertainment Services Ltd | Wholesale & retail | 2021 |
| JS and William Property Ltd | Real estate | 2023 |
| JS Artwork Ltd | Arts & recreation | 2024 |
| JS Brother Limited | Hospitality | 2026 |
| JS Collinson Limited | Real estate | 2022 |
| JS Corporate Events Ltd | Hospitality | 2023 |
| JS Electrical and Property Ltd | Construction | 2024 |
| JS Home Rental Solutions Ltd | Real estate | 2011 |
| JS Joinery & Property Development Ltd | Construction | 2019 |
| JS Pipework Systems Ltd | Construction | 2022 |
| JS Property Portfolio Ltd | Real estate | 2026 |
| JS Real Estate Holdings Ltd | Financial services | 2026 |
| JS Rose Ltd | Professional & scientific | 2024 |
| JSB Automotive Ltd | Wholesale & retail | 2018 |
| Jsbca LLP | | 2026 |
| JSD Couriers Limited | Transport & logistics | 2022 |
| JSF Capital Limited | Financial services | 2025 |
| JSF Driveway and Landscaping Solutions LLP | | 2026 |
| Jsfa Ltd | Wholesale & retail | 2022 |
| JSG Developments Ltd | Construction | 2024 |
| JSG Properties Group Limited | Real estate | 2022 |
| JSH Property Services Ltd | Construction | 2011 |
| Jshs Stoke Limited | Wholesale & retail | 2019 |
| JSJ Group Ltd | Wholesale & retail | 2026 |
| Jslm Limited | Construction | 2021 |
| JSM Accounting Services Limited | Professional & scientific | 2021 |
| Jsmb Consultancy Ltd | Professional & scientific | 2025 |
| JSO Properties Ltd | Real estate | 2023 |
| Jsps Holding UK Ltd | Real estate | 2016 |
| JSR Property Development Ltd | Construction | 2025 |
| JST Business Innovations Limited | Wholesale & retail | 2017 |
| Jsvb Property Ltd | Real estate | 2025 |
| JSW Associates Ltd | Information & communication | 2023 |
| JSX Photography Ltd | Information & communication | 2026 |
| JT Commercial Cleaning Ltd | Administrative & support | 2010 |
| JT Contract Management Limited | Construction | 2015 |
| JT Handtools Limited | Manufacturing | 2011 |
| JT Hospitality Ltd | Professional & scientific | 2025 |
| JT Media Marketing Ltd | Administrative & support | 2023 |
| JT Motoparc Ltd | Other services | 2023 |
| JT Psychology Ltd | Health & social care | 2023 |
| JT PUB Group Limited | Hospitality | 2025 |
| JT Rehab Limited | Wholesale & retail | 2018 |
| JTA Garage Services Limited | Wholesale & retail | 2015 |
| JTB Media Management Ltd | Manufacturing | 2024 |
| JTB Property Solutions Limited | Administrative & support | 2021 |
| Jtec Training Ltd | Education | 2015 |
| JTF Flooring Limited | Construction | 2002 |
| JTI Consulting Limited | Professional & scientific | 2020 |
| Jtmht Limited | Professional & scientific | 1993 |
| JTP Fleet Maintenance Limited | Manufacturing | 2022 |
| Jtpubgroupsg Limited | Hospitality | 2026 |
| JTS Siphonic Services Ltd | Construction | 2024 |
| Jubeyvarieties Limited | Wholesale & retail | 2024 |
| Jubilee Angels Limited | Health & social care | 2014 |
| Jubilee Care Group Ltd | Health & social care | 2025 |
| Jubilee Heights Health Care Limited | Health & social care | 2025 |
| Jubilee Lodge (Streatham) Limited | Households | 2008 |
| Jubilee Works (Staveley) Management Company Limited | Households | 2019 |
| Judas Holdings Ltd | Financial services | 2022 |
| Judd Plant Ltd | Administrative & support | 2023 |
| Jude From Sheffield Ltd | Information & communication | 2023 |
| Judge Limited | Health & social care | 2016 |
| Judoor & Jusoor (J&J) CIC | Education | 2026 |
| Juice 4U Ltd | Manufacturing | 2025 |
| Juice Immersive Ltd | Information & communication | 2017 |
| Juice POD Co Ltd | Wholesale & retail | 2025 |
| Juice Technology (UK) Ltd | Information & communication | 2019 |
| Juice Way Limited | Manufacturing | 2025 |
| Juicy Brucie Limited | Construction | 2025 |
| Juicy Candy Co Ltd | Wholesale & retail | 2023 |
| Jukebox Pubs Ltd | Hospitality | 2019 |
| Julapelli Builds Ltd | Construction | 2025 |
| Jules Electrical Limited | Construction | 2016 |
| Jules Properties Limited | Real estate | 2010 |
| Julia Downs Studio Ltd | Professional & scientific | 2026 |
| Julia Price Ltd | Professional & scientific | 2020 |
| Julia Wylie Limited | Administrative & support | 2010 |
| Julian Homes Ltd | Real estate | 2020 |
| Julian Huxley Fine Art Limited | Arts & recreation | 2020 |
| Julie 284 Limited | Other services | 2006 |
| Julie Clark Ltd | Education | 2025 |
| Julie Elizabeth Greaves Limited | Other services | 2010 |
| Julie Kenny Consultancy Limited | Professional & scientific | 2016 |
| Julie Smith Hair Ltd | Other services | 2026 |
| Julie's Nails Ashtead Ltd | Other services | 2024 |
| Julz Boutique (Dinnington) Ltd | Wholesale & retail | 2021 |
| Jumble Design and Print Limited | Other services | 2020 |
| Jumeriah Spice Ltd | Hospitality | 2017 |
| Jummex Braider Limited | Other services | 2026 |
| Jump Architects Ltd | Professional & scientific | 2011 |
| Junaid for Perfumes Limited | Extraterritorial | 2010 |
| Junction 1 Investments Limited | Transport & logistics | 2008 |