| Jceb Bodham Ltd | Real estate | 2020 |
| Jceb Holiday Rental Ltd | Hospitality | 2017 |
| Jceb Lettings Ltd | Real estate | 2024 |
| Jceb London Ltd | Real estate | 2020 |
| Jceb Property Ltd | Real estate | 2024 |
| Jceb Rectory Ltd | Real estate | 2022 |
| Jceb Rental Ltd | Households | 2017 |
| Jceb RH Ltd | Real estate | 2022 |
| JCG Homes Limited | Real estate | 2014 |
| JCL Property Limited | Real estate | 2021 |
| Jdab Fabrications Ltd | Manufacturing | 2019 |
| JDP Mortgages Ltd | Financial services | 2019 |
| JDS Property Maintenance Ltd | Construction | 2019 |
| JDS Windows & Doors Limited | Construction | 2025 |
| Jeff Bradbrook Limited | Hospitality | 2018 |
| Jelley Properties Ltd | Real estate | 2025 |
| Jemara Beauty Shop Ltd | Other services | 2020 |
| Jenrose Construction Ltd | Construction | 2025 |
| Jersey Parker Electrical Ltd | Construction | 2025 |
| Jersey Parker Holdings Limited | Real estate | 2025 |
| Jess Pizza Ltd | Hospitality | 2026 |
| JET Roller Skating Limited | Arts & recreation | 2018 |
| Jetsfix Ltd | Information & communication | 2023 |
| Jewell Property Ltd | Real estate | 2023 |
| Jezmeister Innovations Ltd | Wholesale & retail | 2025 |
| JG Brickwork Specialists Limited | Construction | 2022 |
| Jgmg Properties Limited | Real estate | 2017 |
| JHI Property Management Ltd | Real estate | 2026 |
| JIM Barrett Bespoke Leather Ltd | Other services | 2022 |
| JJ Care UK P Ltd | Health & social care | 2024 |
| JJH Estate Ltd | Real estate | 2025 |
| JK Peri Peri Limited | Hospitality | 2021 |
| JKK Legal Limited | Professional & scientific | 2018 |
| JKS Electrical Limited | Construction | 2017 |
| JL Bland Plastering Limited | Construction | 2026 |
| Jlight Limited | Health & social care | 2015 |
| JM Burbidge Electrical Limited | Construction | 2024 |
| JM PUB Co Limited | Hospitality | 2025 |
| JME Garden Services Limited | Administrative & support | 2012 |
| JME Ground Services Limited | Administrative & support | 2014 |
| JMW & Partners Limited | Construction | 2017 |
| JO Laskey Limited | Administrative & support | 2019 |
| Joddex Limited | Real estate | 2020 |
| Johal Plumbing & Heating Ltd | Construction | 2026 |
| Johan IFA Support Services Limited | Other services | 2020 |
| John Betts Mortgages Limited | Financial services | 2006 |
| John Coutts Security Limited | Other services | 2000 |
| John Delivery Ltd | Transport & logistics | 2023 |
| John Godrich Limited | Wholesale & retail | 2003 |
| John Hunter Robotic Welding Limited | Manufacturing | 2016 |
| John Newman Hairdressing Limited | Other services | 2011 |
| John S Ward & Co Ltd | Professional & scientific | 2011 |
| John Summers Limited | Wholesale & retail | 1999 |
| John Tolton Plastering Ltd. | Construction | 1999 |
| John Wright Builders Ltd | Construction | 2021 |
| Johnny's Happy Place CIC | Hospitality | 2017 |
| Johno Service Hire Ltd | Transport & logistics | 2025 |
| Johnson Vokes Ltd | Wholesale & retail | 2024 |
| Joicare Services Limited | Health & social care | 2023 |
| Jokim Ltd | Administrative & support | 2025 |
| Jomad Infrastructures and Interior Services Ltd | Construction | 2025 |
| Jonah Property Development Ltd | Real estate | 2021 |
| Jonah Recruitment Ltd | Administrative & support | 2026 |
| Jonathan Reynolds Visual Artist CIC | Arts & recreation | 2024 |
| Jonathan TYE Consulting Limited | Professional & scientific | 2021 |
| Jonathon Mulholland Limited | Arts & recreation | 2017 |
| Jondaveliz Property Limited | Real estate | 2022 |
| Jones & Boggis Ltd | Real estate | 2018 |
| Jongor Software Ltd | Information & communication | 2015 |
| Jorcra Properties Limited | Real estate | 2016 |
| Josanvt Limited | Transport & logistics | 2019 |
| Joseph & Jose Property Ltd | Real estate | 2024 |
| Josiah Wade Limited | Manufacturing | 2018 |
| Journey of Life Media Ltd | Professional & scientific | 2022 |
| Journeysmiths Limited | Administrative & support | 2017 |
| Joyce Healthcare & Beauty Ltd | Health & social care | 2013 |
| Joytec Demining Services Ltd | Professional & scientific | 2025 |
| Joyus Properties Limited | Real estate | 2024 |
| Joywills Limited | Other services | 2014 |
| JP Industrial Engineering Ltd | Professional & scientific | 2026 |
| JP Sale Solutions Ltd | Administrative & support | 2024 |
| Jp's PH Ltd | Hospitality | 2019 |
| Jpc-L Consultancy Services Ltd | Information & communication | 2021 |
| JR Cummins Engineering Ltd | Construction | 2023 |
| Jrcb Holdings Limited | Extraterritorial | 2016 |
| JS and JK Properties (UK) Limited | Real estate | 2021 |
| JSB Brick & Stone Limited | Construction | 2021 |
| JSM Panel Pros Ltd | Administrative & support | 2025 |
| JSW Tax Services LLP | | 2008 |
| JT Heating and Plumbing Services Limited | Construction | 2023 |
| JT4 Driving Ltd | Education | 2024 |
| JTB Transport Limited | Wholesale & retail | 2013 |
| Jtjack Limited | Health & social care | 2022 |
| Julie Buckley Consulting Limited | Administrative & support | 2013 |
| Julies Cafe Ltd | Hospitality | 2025 |
| JULIET4462 Limited | Public administration | 2020 |
| Just Globes Limited | Wholesale & retail | 2006 |
| Just-Batteries Ltd | Wholesale & retail | 2021 |
| JUST925SILVER Ltd | Wholesale & retail | 2025 |
| Justcredit Limited | Extraterritorial | 1991 |