| JH Services Lincs Ltd | Construction | 2023 |
| Jhwm Holdings Limited | Financial services | 2001 |
| JIM Fairburn Holdings Ltd | Financial services | 2022 |
| JIM Fairburn Limited | Manufacturing | 1995 |
| JIM Mellin Fish Sales Limited | Wholesale & retail | 2019 |
| Jim's Fresh Grimsby Fish Limited | Wholesale & retail | 2002 |
| Jim's Yard Limited | Real estate | 2017 |
| JJ Operational Services Limited | Professional & scientific | 2026 |
| JJG Technology Limited | Information & communication | 2023 |
| JJM Consultancy (Lincs) Limited | Health & social care | 2016 |
| JJM Logistics Limited | Transport & logistics | 2017 |
| JJR Plastering Limited | Construction | 2018 |
| Jjrk Limited | Professional & scientific | 2010 |
| JJW Utilities Limited | Construction | 2019 |
| JK Cleaning Services Lincs Limited | Administrative & support | 2017 |
| JK Painting (Lincs) Limited | Construction | 2025 |
| Jk's Epc's Ltd | Professional & scientific | 2022 |
| JKM Industrial Consultants Limited | Construction | 2026 |
| JL & MGE Limited | Wholesale & retail | 2016 |
| JL Rigging & Lifting Limited | Professional & scientific | 2025 |
| JLA Engineering and Construction Ltd | Professional & scientific | 2022 |
| JLA Interiors Limited | Professional & scientific | 2023 |
| JLA Property Services Limited | Construction | 2023 |
| Jlag Developments Ltd | Real estate | 2024 |
| Jlag Properties Ltd | Real estate | 2020 |
| JLB Driving School Ltd | Education | 2019 |
| JLD Joinery Ltd | Construction | 2021 |
| JLI Building Services Limited | Construction | 2011 |
| JM Heating Ltd | Construction | 2023 |
| JM Trucking Limited | Other services | 2013 |
| JMA Joinery and Building Services Ltd | Construction | 2023 |
| Jmac Medical Services Ltd | Health & social care | 2015 |
| JMC Mechanical Engineering Ltd | Professional & scientific | 2018 |
| JMD Wind Tech Ltd | Manufacturing | 2026 |
| JMH Petrochemicals Limited | Professional & scientific | 2026 |
| Jmik Trans Ltd | Transport & logistics | 2022 |
| JML Leisure Ltd | Hospitality | 2014 |
| Jmlh IT Limited | Information & communication | 2024 |
| Jmorrish Ltd | Construction | 2018 |
| JMS Trading (Lincs) Ltd | Wholesale & retail | 2017 |
| JMV Homes Ltd | Real estate | 2017 |
| JN Medical Sono Ltd | Health & social care | 2015 |
| JNB Tools Limited | Wholesale & retail | 2025 |
| JNR Plumbing and Heating (UK) Limited | Construction | 2014 |
| Jobs-In Global Ltd | Information & communication | 2023 |
| Jobs-In.Com Ltd | Information & communication | 2026 |
| Jodamak Estates Limited | Real estate | 2023 |
| JOE Albery DJ Limited | Arts & recreation | 2026 |
| JOE Carr Property Maintenance Ltd | Construction | 2014 |
| JOE Duggan Surfacing Limited | Manufacturing | 2012 |
| Joel Vincent Consultancy Ltd | Other services | 2012 |
| John 14.2 Construction Limited | Construction | 2017 |
| John Barkers Property Limited | Real estate | 2014 |
| John Barkers Solicitors Limited | Professional & scientific | 2011 |
| John Collis Builders Limited | Construction | 1994 |
| John Coxall Fish Sales Limited | Wholesale & retail | 2016 |
| John Hancock Oflo Services Grimsby Ltd | Agriculture & fishing | 2011 |
| John Harrison Foundation | Education | 2010 |
| John Mclauchlan Ltd | Information & communication | 2015 |
| John Pulford & Co Limited | Professional & scientific | 1996 |
| John Smith Auto Repairs Limited | Wholesale & retail | 2002 |
| John Somerscales Limited | Transport & logistics | 1977 |
| John Sutcliffe & SON (Grimsby) Limited | Transport & logistics | 1936 |
| John Tinker & SON Limited | Construction | 2012 |
| John W M King Limited | Professional & scientific | 2012 |
| Johnson Hunt (UK) Limited | Other services | 1992 |
| JOL Investments Limited | Financial services | 2012 |
| Jon's Fish Dish of Grimsby Ltd | Wholesale & retail | 2021 |
| Jonas and Daughter Limited | Health & social care | 2026 |
| Jonathan Hendry Architects Limited | Professional & scientific | 2004 |
| Jonathan Hendry Bespoke Furniture Limited | Professional & scientific | 2005 |
| Jonathan Minster Photography Limited | Professional & scientific | 2003 |
| Jonathan P Spencer Design and Build Limited | Construction | 2013 |
| Jones Engineering Services Ltd | Professional & scientific | 2023 |
| Jonny Draws Limited | Information & communication | 2023 |
| Jools Solutions Limited | Information & communication | 2019 |
| Jopam Limited | Real estate | 2005 |
| Jordan Nuttall Limited | Professional & scientific | 2025 |
| Joulevert Limited | Administrative & support | 2006 |
| JOW Music Limited | Wholesale & retail | 2017 |
| JP2383 Ltd | Professional & scientific | 2019 |
| Jpct Solutions Ltd | Construction | 2019 |
| JPL Plumbing & Heating Ltd | Construction | 2013 |
| JPM Geological Limited | Professional & scientific | 2020 |
| JPW Commercial Plumbing & GAS Ltd | Construction | 2024 |
| JR Automation & Controls Limited | Professional & scientific | 2020 |
| JR Joinery Ltd | Construction | 2024 |
| JRL Communications Ltd | Information & communication | 2023 |
| JRS Automotive Lincolnshire Ltd | Wholesale & retail | 2025 |
| JRS Dynamics Unlimited | Real estate | 2024 |
| JS Engineering Consulting Ltd | Information & communication | 2019 |
| JS Floors Limited | Construction | 2002 |
| JS K9 Security Service Limited | Administrative & support | 2018 |
| JS Land & Developments Ltd | Construction | 2025 |
| JSB Site Services Ltd | Construction | 2014 |
| JSC Freezer Service Limited | Manufacturing | 2002 |
| JSE Consultancy Ltd | Professional & scientific | 2025 |
| JSE Holdings Ltd | Financial services | 2025 |
| Jsee Ltd | Construction | 2015 |
| JSW Building Services Ltd | Professional & scientific | 2024 |