| JT Fabrication & Welding Ltd | Professional & scientific | 2016 |
| Jubilee Fishing Company Limited | Agriculture & fishing | 1982 |
| JUC Computing Limited | Information & communication | 2011 |
| Jugo Investments Ltd | Financial services | 2023 |
| Juice-E Limited | Information & communication | 2010 |
| Julia's Kitchen (BW) Ltd | Hospitality | 2017 |
| JULIANTRANS85 Ltd | Wholesale & retail | 2025 |
| Julie Gibson Limited | Professional & scientific | 2017 |
| Julie Pelling Ltd | Agriculture & fishing | 2025 |
| JUN02020 Ltd | Administrative & support | 2017 |
| June Woods Fashions Ltd | Wholesale & retail | 2012 |
| Jungle Smash Ltd | Hospitality | 2024 |
| Just 26 Logistics Ltd | Transport & logistics | 2025 |
| Just 4 Keepers (UK) Limited | Arts & recreation | 2003 |
| Just Financial Consultants Ltd | Financial services | 2010 |
| Justin Croft Limited | Construction | 2021 |
| JW Dog Grooming Limited | Other services | 2024 |
| JW Industrial Services Lincs Ltd | Professional & scientific | 2024 |
| JW Libera & SON Limited | Wholesale & retail | 2006 |
| JW Services Grimsby Limited | Wholesale & retail | 2018 |
| JW Support Services Limited | Professional & scientific | 2019 |
| JWL Creative Ltd | Professional & scientific | 2024 |
| JWM Insulations Ltd | Construction | 2016 |
| JXC Ltd | Construction | 2025 |
| K & C Autos Limited | Wholesale & retail | 2014 |
| K & C Autos MOT Limited | Wholesale & retail | 2020 |
| K & I Scaffolding Limited | Construction | 2007 |
| K & L Curtain Wall & Glazing Ltd | Construction | 2018 |
| K & M (Lincs.) Property Developments Ltd. | Construction | 2014 |
| K & Q Edenbridge Limited | Hospitality | 2016 |
| K D Design (Lincolnshire) Limited | Professional & scientific | 2003 |
| K E Transport Limited | Transport & logistics | 2022 |
| K One Barber Grimsby Ltd | Other services | 2024 |
| K R Composites Limited | Professional & scientific | 2008 |
| K Towill Limited | Construction | 2025 |
| K&A Rescue Ltd | Wholesale & retail | 2021 |
| K&I Scaffolding & Access Ltd | Construction | 2020 |
| K&K Solowinski Ltd | Transport & logistics | 2015 |
| K&L Distribution Ltd | Wholesale & retail | 2025 |
| K&L Trans Ltd | Transport & logistics | 2019 |
| K&S Electrical Contractors Limited | Manufacturing | 2007 |
| K-9 Klippers (Grimsby) Limited | Other services | 2013 |
| K-O-P JV Ltd | Construction | 2022 |
| K.E.G Construction Limited | Construction | 2019 |
| K.J.B. Limited | Manufacturing | 1998 |
| K2 Wall Claddings Ltd | Construction | 2026 |
| K4K Group Ltd | Households | 2019 |
| KA Booker Ltd | Professional & scientific | 2024 |
| Kaash Limited | Administrative & support | 2018 |
| Kacs Services Ltd | Professional & scientific | 2023 |
| KAD Construction Services Ltd | Construction | 2026 |
| Kalaa Couriers Limited | Administrative & support | 2019 |
| Kallam Medical Limited | Health & social care | 2018 |
| KAM Building Services Ltd | Construction | 2020 |
| Kamotrans Ltd | Transport & logistics | 2019 |
| Kamp Commercials Ltd | Wholesale & retail | 2025 |
| Kane Smith Limited | Construction | 2014 |
| Kanso Management Ltd | Real estate | 2022 |
| Kanso Property Investment Ltd | Real estate | 2018 |
| Kansu Trading Limited | Wholesale & retail | 2014 |
| Kană 77LTD Ltd | Transport & logistics | 2025 |
| Kaodi Cares Limited | Health & social care | 2024 |
| KAP Inspection Services Ltd | Professional & scientific | 2016 |
| Kapsukas Ltd | Transport & logistics | 2018 |
| Kapture Productions Ltd | Information & communication | 2022 |
| KAR Fish Limited | Hospitality | 2003 |
| Karcz Software Ltd | Information & communication | 2019 |
| Karen Baker London Ltd | Wholesale & retail | 2019 |
| Kari Developments Ltd | Real estate | 2018 |
| Karl Parker Plastering Services Limited | Construction | 2022 |
| Karl Simpson (Builder) Limited | Construction | 2009 |
| Karma Therapies Limited | Health & social care | 2008 |
| Karosel Care and Domestic Services Ltd | Other services | 2015 |
| KAS Hot Tubs and Maintenance Ltd | Other services | 2020 |
| Kasen Consulting Ltd | Professional & scientific | 2024 |
| Katies Cheeky Monkeys Limited | Health & social care | 2019 |
| Katoomba LLP | | 2017 |
| KAY & SON (Fish Merchants) Limited | Transport & logistics | 1949 |
| KAY Grimsby Limited | Other services | 2023 |
| KB Dental (Property Holdings) Limited | Financial services | 2025 |
| KB Dental Operations Limited | Health & social care | 2025 |
| KBL Cleaning Ltd | Administrative & support | 2023 |
| KBX Properties Limited | Real estate | 2021 |
| KC Detailing Limited | Administrative & support | 2017 |
| KC Outside Design Limited | Administrative & support | 2023 |
| KDN Consultancy Ltd | Professional & scientific | 2025 |
| KDS Grimsby Refrigeration Ltd | Manufacturing | 2025 |
| Kealy Health Care Ltd | Health & social care | 2015 |
| Kebarbe-Q Ltd | Hospitality | 2024 |
| Keelby Fields at Keelby Management Company Limited | Professional & scientific | 2026 |
| Keelby Management Company Limited | Households | 2016 |
| Keelby Stores Ltd | Wholesale & retail | 2022 |
| Keelby Takeaway Ltd | Hospitality | 2026 |
| Keelby Village Stores Ltd | Wholesale & retail | 2017 |
| Keep Fit EAT Fit Wellbeing Ltd | Other services | 2019 |
| Keetch Factors (1984) Limited | Wholesale & retail | 1983 |
| KEF Management Limited | Real estate | 2021 |
| KEI Trans Ltd | Transport & logistics | 2023 |
| Keigar Properties Ltd | Real estate | 2000 |
| Keirscardkingdom Ltd | Wholesale & retail | 2025 |