| Humber FMS Limited | Administrative & support | 2024 |
| Humber Homes and Developments Limited | Real estate | 2024 |
| Humber Housing Group Ltd | Real estate | 2024 |
| Humber Landlords Association (HLA) | Public administration | 2019 |
| Humber LPC Limited | Administrative & support | 2016 |
| Humber Music Preparation Ltd | Information & communication | 2026 |
| Humber Projects Ltd | Construction | 2020 |
| Humber Safety Boats Limited | Administrative & support | 2021 |
| Humber Sameday Ltd | Transport & logistics | 2010 |
| Humber Scaffolding Ltd | Extraterritorial | 2013 |
| Humber Village Fast Food Limited | Hospitality | 2025 |
| Humberside Pipework Solutions Ltd | Professional & scientific | 2022 |
| HW Catering Limited | Wholesale & retail | 2023 |
| Hynes Offshore Limited | Manufacturing | 2013 |
| HYPE3 Media Ltd | Information & communication | 2023 |
| I a Residential LLP | | 2019 |
| I J Consultancy Services Limited | Administrative & support | 2009 |
| I Link IT Ltd | Information & communication | 2020 |
| Icassales Ltd | Administrative & support | 2017 |
| Ice Fresh Seafood Limited | Manufacturing | 2005 |
| Ideal Engineering UK Limited | Manufacturing | 2014 |
| Ideng Holdings Limited | Real estate | 2023 |
| IHL Tech Ltd | Information & communication | 2015 |
| Image Registrations Limited | Wholesale & retail | 2004 |
| Impetus GB Limited | Wholesale & retail | 2007 |
| IN Socials Ltd | Professional & scientific | 2025 |
| Independent Safeguarding Consultancy Limited | Public administration | 2025 |
| Indiesoft Limited | Information & communication | 2015 |
| Inesesales Limited | Wholesale & retail | 2025 |
| Infinity Club Limited | Information & communication | 2024 |
| Ingleton Plumbing & Heating Limited | Construction | 2007 |
| Innes Limited | Professional & scientific | 2025 |
| Innovation Architecture Limited | Professional & scientific | 2012 |
| Innovex UK Consulting Limited | Information & communication | 2024 |
| Inpinion Ltd | Information & communication | 2015 |
| Input Kitchens Ltd | Construction | 2002 |
| Insight Photographers Ltd | Professional & scientific | 2014 |
| Insights Imaging Ltd | Health & social care | 2024 |
| Inspire Services of Anaesthetics Limited | Health & social care | 2020 |
| Inspire Spaces (Hull) Ltd | Construction | 2024 |
| Intradev Limited | Information & communication | 2005 |
| Intrasource Holdings Limited | Information & communication | 2016 |
| Intrasource Limited | Information & communication | 2000 |
| Intuitive Accounting Limited | Professional & scientific | 2014 |
| Iplay Sports Ltd | Arts & recreation | 2018 |
| ISD Computer Services Limited | Information & communication | 2001 |
| Isuria Limited | Wholesale & retail | 1996 |
| Isuria Shipping Limited | Transport & logistics | 2002 |
| It's ALL Gravy Entertainment Limited | Arts & recreation | 2020 |
| IVY & Woods Hair and Beauty Limited | Other services | 2020 |
| IVY Gaming Systems Limited | Information & communication | 2012 |
| J & L Properties (Hull) LLP | | 2007 |
| J H Levison (Dock B) Limited | Construction | 2021 |
| J Levison Limited | Wholesale & retail | 2005 |
| J Levison Services Limited | Professional & scientific | 2021 |
| J Rhind Group Limited | Professional & scientific | 2025 |
| J&J Property Renovations Ltd | Real estate | 2025 |
| J&L Investments Hessle Limited | Real estate | 2025 |
| J. H. Levison (Holdings) Limited | Financial services | 2010 |
| J. Marr (Commodities) Limited | Agriculture & fishing | 2010 |
| J.S.R. Genetics Limited | Agriculture & fishing | 2000 |
| J.W.T. Services (Yorks) Limited | Professional & scientific | 2017 |
| Jack Fenwick Access Ltd | Construction | 2024 |
| Jackson Energy Ltd | Professional & scientific | 2022 |
| Jackson's Bakery Limited | Manufacturing | 2000 |
| Jacksons Inns & Taverns Limited | Extraterritorial | 1943 |
| JAM Mill Limited | Professional & scientific | 2010 |
| James & Matin Properties Ltd | Real estate | 2024 |
| James Green Mortgage Ltd | Financial services | 2018 |
| James Hardy Limited | Professional & scientific | 2018 |
| James Peter Property Limited | Real estate | 2022 |
| James T Blakeman & Co (Holdings) Limited | Professional & scientific | 1992 |
| James T Blakeman & Co Limited | Manufacturing | 1992 |
| James T. Blakeman (Services) Limited | Manufacturing | 1999 |
| Jameson Keep Management Company Limited | Households | 2013 |
| Jane Hollowood Associates Limited | Arts & recreation | 1998 |
| Jansons Retail Ltd | Wholesale & retail | 2022 |
| Jason Cook Financial Services Limited | Financial services | 2017 |
| Jaspilite Investments Ltd | Real estate | 2021 |
| Jawbaw Limited | Extraterritorial | 2007 |
| JB98 Properties Ltd | Real estate | 2024 |
| JBJ Securities Limited | Financial services | 2023 |
| JCS Joinery Limited | Manufacturing | 2025 |
| JD Automotive Services Ltd | Administrative & support | 2025 |
| JD Fire Alarm Services Ltd | Construction | 2014 |
| Jdec Decorators Limited | Construction | 2011 |
| Jeffrey Boakye Limited | Education | 2020 |
| Jenkinson Wealth Management Ltd | Professional & scientific | 2017 |
| Jenny Marston PR Ltd | Professional & scientific | 2024 |
| Jenose Limited | Health & social care | 2025 |
| Jeoffreys Travels and Tours Limited | Administrative & support | 2026 |
| Jerrymedix Limited | Health & social care | 2026 |
| Jessica Maccio Ltd | Professional & scientific | 2022 |
| Jey's Stores Ltd | Wholesale & retail | 2026 |
| JGS Russell Ltd | Health & social care | 2022 |
| Jillywood Properties Limited | Construction | 2023 |
| JMC Interiors (Southern) Limited | Construction | 2008 |
| JNA Homes Limited | Real estate | 2024 |
| JO Harding Photography Limited | Professional & scientific | 2019 |
| JO Works Ltd | Administrative & support | 2014 |