| Jeet Fashions London Limited | Wholesale & retail | 2019 |
| Jeet Property Investments Ltd | Real estate | 2026 |
| Jeevaaprivate Limited | Hospitality | 2023 |
| Jeevan Motors Limited | Wholesale & retail | 2020 |
| Jeevan Thapa Ltd | Wholesale & retail | 2018 |
| Jeeven's Hotel Limited | Hospitality | 2026 |
| Jeevens Properties Investment Limited | Real estate | 2020 |
| Jeff Barber Salon Limited | Other services | 2019 |
| Jeffcock 110 Limited | Construction | 2026 |
| JEL IT Limited | Information & communication | 2019 |
| JEM Aesthetics Beauty Ltd | Other services | 2025 |
| Jemco Sale Limited | Wholesale & retail | 2023 |
| Jemm Property Investments Limited | Real estate | 2018 |
| Jenrac Academy Ltd | Information & communication | 2011 |
| Jenson's Little Feet Ltd | Wholesale & retail | 2021 |
| Jeremys Carebuddies Limited | Administrative & support | 2015 |
| Jeshna Technologies Ltd | Information & communication | 2026 |
| Jesicleaning Ltd | Administrative & support | 2025 |
| Jesraj Ltd | Hospitality | 2025 |
| Jesse James Property Ltd | Real estate | 2022 |
| Jesus Restoration Centre Limited | Other services | 2004 |
| JET Transport Limited | Transport & logistics | 2017 |
| Jetsetparkandride Ltd | Other services | 2024 |
| Jeveon Ltd | Wholesale & retail | 2025 |
| Jewellery Interiors Limited | Construction | 2017 |
| Jeyarajans Dental Care Limited | Health & social care | 2006 |
| Jfkc 2025 Ltd | Real estate | 2025 |
| JFM Neate Ltd | Construction | 2025 |
| JG Mangat Properties Limited | Real estate | 2024 |
| JG Nail Salon Ltd | Other services | 2022 |
| JGC Solutions Ltd | Information & communication | 2025 |
| JH Advisors Limited | Professional & scientific | 2024 |
| Jhanji Property Holdings Ltd | Real estate | 2026 |
| Jhanji Property Ltd | Real estate | 2019 |
| Jheeta Contractors Ltd | Construction | 2018 |
| Jhimb Limited | Real estate | 2018 |
| Jiayu Group Ltd | Wholesale & retail | 2022 |
| Jigsaw Bricks Limited | Households | 2024 |
| Jigstech Limited | Wholesale & retail | 2026 |
| Jiireh Ltd | Professional & scientific | 2022 |
| Jims Technologies Ltd | Information & communication | 2020 |
| Jinia Holdings Ltd | Real estate | 2026 |
| Jiya Dream Foods Ltd | Hospitality | 2025 |
| JJ Butterfly Ltd | Other services | 2020 |
| JJ Stroge Ltd | Construction | 2025 |
| JJ Supply UK Ltd | Wholesale & retail | 2024 |
| Jjgm & Co Limited | Other services | 2025 |
| JK Family Investment Ltd | Real estate | 2022 |
| JK Heating and Air CON Limited | Energy | 2019 |
| JK Highways Ltd | Transport & logistics | 2018 |
| JK Land Estates Ltd | Real estate | 2020 |
| JK One Builders Ltd | Construction | 2014 |
| JK Realty Ltd | Real estate | 2018 |
| JK Sekhon Properties Ltd | Real estate | 2021 |
| JK Star Investment Ltd | Real estate | 2024 |
| JK11 Ltd | Professional & scientific | 2026 |
| JK1828 Limited | Wholesale & retail | 2024 |
| JKH Food and Wine Limited | Wholesale & retail | 2015 |
| JKM Catering Enterprises Limited | Hospitality | 2014 |
| JKO Salesforce Ltd | Wholesale & retail | 2025 |
| JKR Professional Services Ltd | Health & social care | 2024 |
| JKS International Ltd | Wholesale & retail | 2026 |
| Jkvn Ltd | Hospitality | 2026 |
| Jmahajan Limited | Information & communication | 2018 |
| Jmans Jewellers Ltd | Wholesale & retail | 2007 |
| JMC Estate Management Ltd | Real estate | 2021 |
| JMC Services Ltd | Other services | 2024 |
| JMC Your Own Shop Ltd | Wholesale & retail | 2022 |
| JMD Bazaar Limited | Wholesale & retail | 2021 |
| JMD Building Ltd | Construction | 2023 |
| JNA Solutions Ltd | Wholesale & retail | 2025 |
| JNC Food & Wine Ltd | Wholesale & retail | 2017 |
| JND Travels Ltd | Transport & logistics | 2015 |
| JNK Investments Ltd | Wholesale & retail | 2025 |
| JNL VEG Ltd | Wholesale & retail | 2018 |
| JNP Services Ltd | Wholesale & retail | 2025 |
| JNY Accountants Limited | Professional & scientific | 2025 |
| JOB N JOB (UK) Ltd | Administrative & support | 2008 |
| Joechar Ltd | Health & social care | 2019 |
| Joemoore Limited | Other services | 2020 |
| Jog&H Limited | Wholesale & retail | 2024 |
| Jogabrar Ltd | Wholesale & retail | 2024 |
| Jogill LLP | | 2025 |
| Johal & Kumar Properties Limited | Real estate | 2025 |
| Johal Property Holdings Ltd | Real estate | 2020 |
| Johar Trading Limited | Hospitality | 2010 |
| John Keble Close Limited | Construction | 2018 |
| John Paul Peter & Francis Limited | Administrative & support | 2012 |
| Johnnyy Trans Ltd | Transport & logistics | 2018 |
| Johnson & Moore Ltd | Other services | 2018 |
| Johnson Consultancy Services Ltd | Manufacturing | 2025 |
| Joingenzero Ltd | Wholesale & retail | 2026 |
| Jojosh Media Limited | Professional & scientific | 2026 |
| Jojosh Travels Limited | Transport & logistics | 2023 |
| Jokan Limited | Financial services | 2013 |
| Jolet Property Ltd | Real estate | 2026 |
| Jolly Gardeners SW14 Ltd | Hospitality | 2023 |
| Jollys Indian Cuisine Ltd | Hospitality | 2019 |
| Jolu Productions Ltd | Information & communication | 2022 |
| Jonesmoves Ltd | Transport & logistics | 2019 |