| Jimclear Solutions Ltd | Health & social care | 2025 |
| Jireh Staffing Solutions Limited | Administrative & support | 2022 |
| Jitano Ltd | Wholesale & retail | 2025 |
| JJ Cars & Recovery Limited | Wholesale & retail | 2026 |
| JJ Group Hull Ltd | Hospitality | 2025 |
| JJ Hilton Limited | Real estate | 2017 |
| JJ Hull Property Limited | Real estate | 2020 |
| JJ News Ltd | Wholesale & retail | 2018 |
| JJ Plastering Services Limited | Construction | 2003 |
| JJ Travel (Hull) Ltd | Transport & logistics | 2019 |
| JJ Unique Merchandising Ltd | Wholesale & retail | 2023 |
| JJB Property Developments Yorkshire Limited | Real estate | 2025 |
| JJO Inspection Services Limited | Professional & scientific | 2023 |
| JJP Property Rentals Ltd | Real estate | 2023 |
| JJS (Hull) Limited | Construction | 2012 |
| Jjsmgroup Ltd | Wholesale & retail | 2025 |
| JJW Electrical Ltd | Construction | 2015 |
| JK Laundry Hull Ltd | Other services | 2025 |
| JK Spa Ltd | Manufacturing | 2022 |
| JK Walmsley Fish Merchants Ltd | Wholesale & retail | 2017 |
| JKE (Properties) Ltd | Real estate | 2017 |
| JKF Yacht Support UK Ltd | Wholesale & retail | 2026 |
| JKL Baker Holdings Limited | Financial services | 2025 |
| JKW Services Ltd | Construction | 2024 |
| JL Consultancy (Hull) Limited | Administrative & support | 2022 |
| JL Steel Structures Ltd | Construction | 2019 |
| JLB Networks Ltd | Construction | 2025 |
| JLE Wind Ltd | Construction | 2022 |
| JLG Hull Limited | Real estate | 2019 |
| JLH Environmental Ltd | Professional & scientific | 2020 |
| JLM OIL & GAS Limited | Professional & scientific | 2014 |
| JLM TEK Ltd | Manufacturing | 2024 |
| JLP Accounting Limited | Professional & scientific | 2012 |
| JLP Scaffolding (Holdings) Ltd | Financial services | 2020 |
| JLP Scaffolding Ltd | Construction | 2015 |
| JLP Solutions Limited | Professional & scientific | 2013 |
| JM & MH Holdings Ltd | Real estate | 2020 |
| JM Electrical Services Hull Ltd | Construction | 2022 |
| Jmbannister Limited | Construction | 2025 |
| Jmc-Lex Ltd | Administrative & support | 2016 |
| Jmcegroupuk Ltd | Professional & scientific | 2024 |
| Jmee Holdings Limited | Financial services | 2021 |
| Jmhh Limited | Other services | 2026 |
| JMJ Woodworking Machinery Limited | Wholesale & retail | 1990 |
| Jmjm Group Ltd | Hospitality | 2019 |
| Jmjr Group Ltd | Hospitality | 2019 |
| JMK PVT Limited | Transport & logistics | 2025 |
| JMO Properties Limited | Real estate | 2019 |
| JMS (Consultancy Services) Limited | Real estate | 1994 |
| JMS Projects Ltd | Professional & scientific | 2012 |
| JMS Sofa Ltd | Wholesale & retail | 2022 |
| JN Electrical Services Hull Limited | Construction | 2024 |
| JNE Electrical Contracts Limited | Construction | 2014 |
| Jnen UK Limited | Construction | 2014 |
| Jnielson Services Ltd | Construction | 2026 |
| JNR Mawers Ltd | Real estate | 2024 |
| Jo's Nursing Services Ltd | Health & social care | 2015 |
| Jo-Em Wind Services Ltd | Manufacturing | 2025 |
| Joanna Property Investment Limited | Real estate | 2026 |
| Joannapower Ltd | Construction | 2026 |
| Jobbed Technologies Ltd | Information & communication | 2026 |
| Jobly Solution Ltd | Administrative & support | 2023 |
| Jodem Global Solutions Ltd | Transport & logistics | 2026 |
| JOE Ruby Properties Limited | Real estate | 2020 |
| Joelfx Ltd | Professional & scientific | 2024 |
| Jofresh Collections Ltd | Wholesale & retail | 2026 |
| Jogaman Property Ltd | Real estate | 2025 |
| John and SON Holdings Ltd | Real estate | 2024 |
| John Blades Construction and Glazing Ltd | Construction | 2013 |
| John Boland Print & Rubber Stamp Manufacturers Limited | Manufacturing | 1985 |
| John Brocklesby Holdings Limited | Professional & scientific | 2013 |
| John Brocklesby Metal Management Ltd | Water & waste | 2011 |
| John Cleland Limited | Health & social care | 2014 |
| John Cockerill Hamon UK Ltd | Construction | 2023 |
| John Dobson Limited | Transport & logistics | 1974 |
| John Downs Redmore (Hull) Limited | Wholesale & retail | 2008 |
| John Fitzgerald Limited | Professional & scientific | 2016 |
| John H. Whitaker (Holdings) Limited | Transport & logistics | 1910 |
| John H. Whitaker (Management) Limited | Administrative & support | 1980 |
| John H. Whitaker (Properties) Limited | Real estate | 1979 |
| John H.Whitaker (Tankers) Limited | Transport & logistics | 1927 |
| John Hall Engineering Limited | Manufacturing | 1997 |
| John Law and SON Limited | Construction | 2002 |
| John PYE Business Solutions Ltd | Professional & scientific | 2018 |
| John ROE Group Limited | Financial services | 2019 |
| John ROE Holdings Limited | Financial services | 2021 |
| John Tree Felling Ltd | Transport & logistics | 2021 |
| John Vergette Limited | Wholesale & retail | 1954 |
| John Victor Group Limited | Manufacturing | 2017 |
| Johnson Capital Advisory Limited | Professional & scientific | 2012 |
| Johnson Construction Holdings Limited | Construction | 2015 |
| Johnson Joinery Services Ltd | Construction | 2022 |
| Johnson Properties & Renovations Ltd | Real estate | 2025 |
| Johnson's Stores Limited | Wholesale & retail | 2013 |
| Johnsons 2023 Ltd | Administrative & support | 2025 |
| Johnympl Ltd | Manufacturing | 2018 |
| Joiner TIM Ltd | Construction | 2026 |
| Joinery Atelier Ltd | Construction | 2025 |
| Joinery Solutions (ES) Limited | Construction | 2019 |
| Joiuss Limited | Wholesale & retail | 2021 |