| Jkcapitalmarkets Ltd | Financial services | 2025 |
| JKD Cleaning Ltd | Wholesale & retail | 2025 |
| JKH Builders Limited | Construction | 2019 |
| Jklv Limited | Construction | 2025 |
| JKM Developers Limited | Real estate | 2019 |
| JLA Transport Ltd | Transport & logistics | 2021 |
| JLB Building Services Ltd | Construction | 2016 |
| Jlnk Property Ltd | Real estate | 2024 |
| JM Dynamics Solutions Ltd | Information & communication | 2024 |
| JM Jamaican Airlines Limited | Transport & logistics | 2025 |
| JM London Limited | Wholesale & retail | 2026 |
| JM Natural Healing Limited | Health & social care | 2023 |
| JM Properties (London) Ltd | Real estate | 2020 |
| JM Roof & Construction Ltd | Construction | 2025 |
| JM44 Ltd | Construction | 2025 |
| JMC Central Limited | Real estate | 2024 |
| JMC GAS, Plumbing & Electrical Ltd | Administrative & support | 2016 |
| JMK Design and Build Limited | Real estate | 2017 |
| JMK Renewal Limited | Construction | 2017 |
| JMK Rising Ltd | Real estate | 2026 |
| JMP Associates Ltd | Professional & scientific | 2025 |
| JMP Investments Ltd | Real estate | 2022 |
| JMS Hospitality Services Ltd | Hospitality | 2020 |
| JMS Household Limited | Wholesale & retail | 2024 |
| Jmtk Barking Ltd | Real estate | 2026 |
| Jmtk Developers Limited | Real estate | 2016 |
| Jmtk Homes Ltd | Real estate | 2020 |
| Jmtk Property Investment UK Ltd | Real estate | 2013 |
| Jmtk Waterlooville Ltd | Real estate | 2026 |
| JMU Motors Limited | Wholesale & retail | 2025 |
| JN IT Consulting Limited | Information & communication | 2018 |
| JNF Talent Studio | Education | 2025 |
| JNL Chauffeurs Limited | Transport & logistics | 2019 |
| JNM Retail Ltd | Wholesale & retail | 2015 |
| Jnth Ltd | Health & social care | 2021 |
| Joda Security Systems Ltd | Construction | 2023 |
| Jodh Home Solution Ltd | Construction | 2022 |
| Johal Builders UK Ltd | Construction | 2017 |
| Johal TPT Limited | Transport & logistics | 2025 |
| Johal Transport London Limited | Transport & logistics | 2024 |
| Johar Corporation Heston Ltd | Real estate | 2021 |
| Johar Corporation Ltd | Real estate | 2014 |
| John Harvey Limited | Other services | 2014 |
| John Neale Architects Ltd | Professional & scientific | 2023 |
| Joint Real Estate Limited | Real estate | 2022 |
| JOL Farnham Limited | Other services | 2025 |
| Jolsh Ltd | Wholesale & retail | 2008 |
| Jomar Developments Limited | Construction | 2018 |
| Jomcc Limited | Information & communication | 2025 |
| Jonathan James Dean Limited | Information & communication | 2007 |
| Josan Developments Limited | Real estate | 2023 |
| Josemario Couriers Limited | Transport & logistics | 2026 |
| Joseph C Rigging 94 Ltd | Construction | 2025 |
| Josh Trading Ltd | Hospitality | 2019 |
| Joshi Developments Limited | Construction | 2017 |
| Joshi Home Development Ltd | Construction | 2025 |
| Josholin Limited | Health & social care | 2022 |
| Joshua Suneel Ministries | Other services | 2023 |
| Jossan Construction Limited | Construction | 2022 |
| JOT & Jass Ltd | Construction | 2013 |
| Jott Fashions Ltd | Wholesale & retail | 2024 |
| Joyes Holding Ltd | Financial services | 2023 |
| Joyous Limited | Health & social care | 2012 |
| Joyya Law Chambers Limited | Professional & scientific | 2019 |
| JP Investco Ltd | Real estate | 2024 |
| JP Roofing and Building Middlesex Ltd | Construction | 2024 |
| JP Shutters Limited | Manufacturing | 2022 |
| Jpavnoor Construction Limited | Construction | 2024 |
| JPB Logistics Ltd | Transport & logistics | 2023 |
| JPG Constructions Ltd | Construction | 2018 |
| Jpgw Ltd | Information & communication | 2020 |
| JPH Convenience Store Limited | Wholesale & retail | 2022 |
| JR Steel Services Ltd | Manufacturing | 2020 |
| JR7 Victoria Ltd | Wholesale & retail | 2022 |
| JRC Immersive Entertainment UK Ltd | Arts & recreation | 2025 |
| JRD Logistics Ltd | Transport & logistics | 2026 |
| JRI Investments Ltd | Real estate | 2025 |
| JRJ Housing Limited | Real estate | 2016 |
| JRN Bricklayer Ltd | Construction | 2022 |
| Jrpk Construction Ltd | Construction | 2025 |
| JS & KS Ltd | Real estate | 2023 |
| JS 24/7 Plumbing&Electric Service Ltd | Construction | 2026 |
| JS Bazaz Limited | Wholesale & retail | 2011 |
| JS Construction & Property Maintenance Ltd | Construction | 2013 |
| JS Construction Building Services Ltd | Construction | 2019 |
| JS Contractors & Builders Ltd | Construction | 2025 |
| JS Gulati & Co Limited | Professional & scientific | 2002 |
| JS Heating and Plumbing Ltd | Construction | 2019 |
| JS Holding & Bless Investor Ltd | Financial services | 2025 |
| JS Home Builders Ltd | Construction | 2023 |
| JS Multani Construction Ltd | Construction | 2021 |
| JS Prime Development Ltd | Construction | 2024 |
| JS Properties and Service Ltd | Real estate | 2024 |
| JS Property Holdings Ltd | Real estate | 2025 |
| JS Speedy Brickwork Ltd | Construction | 2024 |
| JS UK Construction Ltd | Construction | 2023 |
| JSA Traders Ltd | Wholesale & retail | 2013 |
| JSB Consultants Limited | Professional & scientific | 2015 |
| JSD Enterprise Limited | Wholesale & retail | 2017 |
| JSD Home Builders (UK) Ltd | Construction | 2024 |