| Hutchinson Schofield Limited | Real estate | 2025 |
| Hutchinson-Peacock PTS Ltd | Transport & logistics | 2026 |
| Hutten Ltd | Manufacturing | 2009 |
| HVF Construction Services Limited | Construction | 2009 |
| HVH (Cheshire) Limited | Administrative & support | 2004 |
| HVT Estates Ltd | Real estate | 2024 |
| HW Law LLP | | 2011 |
| HW Music Ltd | Other services | 2017 |
| Hwct Ltd | Hospitality | 2024 |
| HX Real Estates Ltd | Real estate | 2025 |
| HYA Lips Ltd | Other services | 2019 |
| Hyder Corporation Limited | Real estate | 2011 |
| Hydes Online Ltd | Construction | 2013 |
| Hydro Monitors Ltd | Manufacturing | 2022 |
| Hydrogen Wankel Engines Limited | Professional & scientific | 2017 |
| Hydronic Networks Ltd | Professional & scientific | 2013 |
| Hyec Limited | Wholesale & retail | 2023 |
| Hyland Joinery Ltd | Construction | 2020 |
| Hypercartix Ltd | Wholesale & retail | 2025 |
| Hypercreative Agency Ltd | Professional & scientific | 2026 |
| Hypnotherapy and Mindfulness Solutions Limited | Health & social care | 2024 |
| Hypnotherapy DR Ltd | Health & social care | 2023 |
| Hypodermal Ltd | Health & social care | 2017 |
| Hystat Accumulators Limited | Professional & scientific | 2022 |
| Hystat Holdings Limited | Financial services | 2019 |
| Hyxy Ltd | Wholesale & retail | 2021 |
| HZG Electrical Services Ltd | Construction | 2023 |
| I & F Management Ltd | Real estate | 2023 |
| I & S Enterprises Ltd | Real estate | 2017 |
| I & Sons Holdings Ltd | Real estate | 2023 |
| I Draw the Line Ltd | Professional & scientific | 2022 |
| I Fone Tech Ltd | Wholesale & retail | 2017 |
| I Hear YOU Community Interest Company | Health & social care | 2021 |
| I M Travel Ltd | Transport & logistics | 2023 |
| I Munch Food Bar Ltd | Hospitality | 2022 |
| I Nono Ltd | Health & social care | 2022 |
| I P B Communications Holdings Limited | Professional & scientific | 2012 |
| I P B Communications Limited | Professional & scientific | 2001 |
| I R J Consult Limited | Professional & scientific | 2020 |
| I Repair Guys Huddersfield Limited | Wholesale & retail | 2026 |
| I Taste Food Ltd | Hospitality | 2024 |
| I Tax Accountancy Ltd | Professional & scientific | 2021 |
| I&M Dent Ltd | Health & social care | 2014 |
| I&S Fashion Ltd | Wholesale & retail | 2024 |
| I'M From Limited | Manufacturing | 2015 |
| I-Site Construction Services Ltd | Professional & scientific | 2021 |
| I.K.E.R Healthcare Ltd | Professional & scientific | 2024 |
| I.M. (Contractors) Limited | Real estate | 1984 |
| I.N.C. Resales Ltd | Professional & scientific | 2025 |
| I.T. Retail Systems Limited | Information & communication | 1996 |
| I3 KAP Holdings Limited | Financial services | 2015 |
| I3UK Ltd | Information & communication | 2025 |
| IA Associates Ltd | Professional & scientific | 2025 |
| IA Healthy Smiles Ltd | Health & social care | 2022 |
| IA Medical Ltd | Health & social care | 2021 |
| IA Optical Services Ltd | Health & social care | 2023 |
| IA Quality Buys Ltd | Wholesale & retail | 2022 |
| Iain Ltd | Professional & scientific | 2019 |
| Iald Limited | Wholesale & retail | 2021 |
| IAN Curry Consultancy Ltd | Professional & scientific | 2022 |
| IAN Huddersfield CIC | Administrative & support | 2024 |
| IAN Shorten Consulting Limited | Professional & scientific | 2021 |
| IAN Simpson Ltd | Professional & scientific | 2016 |
| IAN W. Bentley Bulk Transport Limited | Transport & logistics | 2006 |
| Iballisticsquid Limited | Information & communication | 2014 |
| Ibelifestyle Limited | Wholesale & retail | 2021 |
| Ibex Express Ltd | Wholesale & retail | 2024 |
| IBO Analytics Ltd | Professional & scientific | 2012 |
| Ibrar Mart Ltd | Wholesale & retail | 2025 |
| Ibrent Ltd | Real estate | 2017 |
| Icarus Ideas Limited | Education | 2002 |
| Icarus Ventures 23 Ltd | Real estate | 2023 |
| Ice & Spice Skelmanthorpe Ltd | Hospitality | 2023 |
| Ice and Spice Limited | Hospitality | 2026 |
| Ichiban Autos Ltd | Wholesale & retail | 2017 |
| Icleangutterz Ltd | Administrative & support | 2025 |
| Icon Distillers Limited | Administrative & support | 2017 |
| Iconic Art Limited | Extraterritorial | 2003 |
| Iconic Fashion Limited | Wholesale & retail | 2026 |
| Iconic Upgrades Ltd | Information & communication | 2025 |
| Icons Chocolate Ltd | Manufacturing | 2021 |
| Icupping Ltd | Health & social care | 2022 |
| ID Creative Digital Limited | Professional & scientific | 2016 |
| ID Motors Huddersfield Ltd | Wholesale & retail | 2025 |
| ID Productions Limited | Information & communication | 1998 |
| ID Recruitment Limited | Administrative & support | 2021 |
| Id-Workz Ltd | Wholesale & retail | 2013 |
| ID30 Limited | Information & communication | 2002 |
| IDA & Nala Investments Limited | Hospitality | 2021 |
| Ideal Stairlifts Limited | Professional & scientific | 2024 |
| Ideas by Cat Ltd | Professional & scientific | 2017 |
| IDL (Yorkshire) Limited | Transport & logistics | 2022 |
| Idriss Properties Ltd | Real estate | 2024 |
| Idsm Ltd | Information & communication | 2024 |
| Idubz Ltd | Wholesale & retail | 2024 |
| IE2 Limited | Wholesale & retail | 2023 |
| Ierissos Limited | Health & social care | 2024 |
| IF Management Co Ltd | Professional & scientific | 2013 |
| IFG Drake Limited | Manufacturing | 1945 |
| Ifitnessclub Ltd | Wholesale & retail | 2025 |