| Jumaira Delight Ltd | Wholesale & retail | 2024 |
| Jumarmaj Ltd | Construction | 2016 |
| Jumatherapyuk Ltd | Health & social care | 2024 |
| Jumay Limited | Information & communication | 2020 |
| Jumb Beck Trading | Financial services | 2019 |
| Jumbo Express 116 Ltd | Hospitality | 2026 |
| Jumbo Records Limited | Wholesale & retail | 2014 |
| Jumping Monkeys Ltd | Manufacturing | 2016 |
| Jumpstart and Recovery UK Ltd | Transport & logistics | 2025 |
| JUN Teng Limited | Hospitality | 2024 |
| Junaid Ashraf Paediatric Urology Ltd | Health & social care | 2024 |
| Junaid Syed Tech Solutions Ltd | Information & communication | 2026 |
| Junction 31 Products Limited | Wholesale & retail | 2025 |
| Junction 31 Wholesale Flooring Limited | Wholesale & retail | 2021 |
| Junction Convenience Limited | Wholesale & retail | 2024 |
| Junction Farm Limited | Agriculture & fishing | 2019 |
| Jundi and Associates Ltd | Health & social care | 2021 |
| Junestead (Cypress Point) Limited | Real estate | 2000 |
| Junestead Holdings Limited | Real estate | 1987 |
| Junestead Limited | Real estate | 1964 |
| Juney Baby Ltd | Real estate | 2022 |
| Jungle I.T. Holdings Limited | Financial services | 2026 |
| Jungle I.T. Limited | Wholesale & retail | 2004 |
| Jungle Kids Limited | Education | 2020 |
| Junglecatz (Leeds) Ltd | Other services | 2021 |
| Junglecatz Parties Ltd | Other services | 2021 |
| Junior J Limited | Wholesale & retail | 2018 |
| Juniors Property Holdings Ltd | Real estate | 2026 |
| Juniors Property Sourcing Ltd | Real estate | 2026 |
| Juniper Farm Ltd | Agriculture & fishing | 2025 |
| Juniper Reproductive Health Ltd | Financial services | 2023 |
| Junizzle Couriers Limited | Transport & logistics | 2025 |
| Junk Mail Film Limited | Information & communication | 2013 |
| Juno Salon Ltd | Other services | 2023 |
| Jupiter Construction Ltd | Construction | 2016 |
| Jupiter Estate Agents Ltd | Real estate | 2025 |
| Jupiter FM Ltd | Construction | 2020 |
| Jupiter Opco Limited | Financial services | 2025 |
| Jurang Wholesale Limited | Wholesale & retail | 2010 |
| Jurijsk Ltd | Transport & logistics | 2018 |
| JUS Paint Ltd | Construction | 2025 |
| Just a Ride Productions Ltd | Arts & recreation | 2025 |
| Just ADD Water (Development) Limited | Information & communication | 2006 |
| Just Aluminium Limited | Manufacturing | 2021 |
| Just ASK Janet Ltd | Administrative & support | 2019 |
| Just Boxing Ltd | Wholesale & retail | 2020 |
| Just Business IT Limited | Information & communication | 2013 |
| Just Cleaning Leeds Limited | Other services | 2025 |
| Just Compare Limited | Professional & scientific | 2016 |
| Just Consultants Ltd | Administrative & support | 2023 |
| Just Delia With IT Limited | Administrative & support | 2023 |
| Just Design Homes Limited | Construction | 2011 |
| Just Fit Interiors Ltd | Construction | 2024 |
| Just Grand! Vintage Tearoom Ltd | Hospitality | 2012 |
| Just Halal Kebabs Ltd | Hospitality | 2025 |
| Just in Time (BFD) Ltd | Information & communication | 1989 |
| Just Juniper Media Ltd | Professional & scientific | 2019 |
| Just Lamps Limited | Extraterritorial | 2017 |
| Just Local (Leeds) Ltd | Wholesale & retail | 2022 |
| Just Lovett Design Limited | Professional & scientific | 2018 |
| Just MEN Barbers Ltd | Other services | 2021 |
| Just Properties (London) Ltd. | Administrative & support | 2014 |
| Just Property Experts Ltd | Manufacturing | 2015 |
| Just Rest Investments Ltd | Real estate | 2023 |
| Just Sharepoint Consulting Ltd | Administrative & support | 2017 |
| Just Shoes Leeds Ltd | Wholesale & retail | 2011 |
| Just Sian Limited | Professional & scientific | 2024 |
| Just Source Limited | Professional & scientific | 2015 |
| Just Trays Limited | Manufacturing | 2004 |
| Just Van & BUS Limited | Administrative & support | 2009 |
| Just Vixen Limited | Other services | 2026 |
| Just Wallpapers Limited | Wholesale & retail | 1998 |
| Just-Merch Limited | Administrative & support | 2023 |
| Just-Simplify Limited | Information & communication | 2015 |
| JUST2HOST Limited | Information & communication | 2012 |
| Justdels Ltd | Transport & logistics | 2019 |
| Justfones Horsforth Ltd | Wholesale & retail | 2022 |
| Justin Newell Boxing Management Ltd | Arts & recreation | 2025 |
| Justizia Technologies Limited | Administrative & support | 2024 |
| Justklin Ltd | Administrative & support | 2025 |
| Justmnm Solutions Ltd | Professional & scientific | 2019 |
| Justoneclick Ltd | Wholesale & retail | 2024 |
| Justproof Limited | Water & waste | 1991 |
| Justsurveying Limited | Professional & scientific | 2021 |
| Juteks (UK) Limited | Wholesale & retail | 2009 |
| Juuce Limited | Manufacturing | 2014 |
| JV Bright Consultancy Ltd | Information & communication | 2019 |
| JV Property Team Ltd | Real estate | 2024 |
| Jv&Mt Co Ltd | Administrative & support | 2024 |
| Jvaproperty Corperation Ltd | Information & communication | 2024 |
| JVD Developments Limited | Real estate | 2012 |
| JVD Property Limited | Real estate | 2021 |
| JVM Law Ltd | Professional & scientific | 2026 |
| JW & NAW Limited | Financial services | 2019 |
| JW & NW Limited | Financial services | 2019 |
| JW & S Properties Ltd | Hospitality | 2007 |
| JW Advisory Ltd | Professional & scientific | 2022 |
| JW Chelsea Ltd | Real estate | 2021 |
| JW Holiday Homes Ltd | Hospitality | 2026 |
| JW Jeffery Holdings Limited | Financial services | 2025 |