| Imachinery Ltd | Mining & quarrying | 2017 |
| Imna Properties Limited | Real estate | 2025 |
| Imperial Beds Ltd | Wholesale & retail | 2026 |
| IN2BED UK Ltd | Wholesale & retail | 2026 |
| Incorporated Dewsbury and Saville Cricket and Football Club(The) | Arts & recreation | 1893 |
| Indian Nights (Yorks) Ltd | Hospitality | 2011 |
| Indulge Bites Ltd | Hospitality | 2024 |
| Ingenious Trading Limited | Other services | 2013 |
| Innova Property Assets Limited | Real estate | 2025 |
| Innovations in Creative Hair International Ltd | Manufacturing | 2010 |
| Innovative Solutions SS Ltd | Other services | 2016 |
| Insa Properties Ltd | Real estate | 2024 |
| Inspirations Ladies Fashions Ltd | Wholesale & retail | 2011 |
| Inspire Living Ltd | Administrative & support | 2016 |
| Instafone Ltd | Information & communication | 1997 |
| Instep Podiatry & Chiropody Ltd | Health & social care | 2023 |
| Integrated Civil Engineering Ltd | Construction | 2024 |
| Interiors 13 (SY) Ltd | Wholesale & retail | 2019 |
| Interiors 13 Ltd | Wholesale & retail | 2014 |
| Internettransport Ltd | Construction | 2018 |
| Intime ICT Services Ltd | Information & communication | 2013 |
| Ipharmservices Ltd | Wholesale & retail | 2022 |
| IQ Beds Ltd | Manufacturing | 2025 |
| IQ Branch Ltd | Wholesale & retail | 2024 |
| IQ Global Consultancy Ltd | Professional & scientific | 2019 |
| IQ Property Investments Ltd | Real estate | 2022 |
| Iqbal Locums Ltd | Health & social care | 2016 |
| IQH Healthcare Limited | Health & social care | 2016 |
| IQH Properties Ltd | Real estate | 2019 |
| IRB Locums Limited | Health & social care | 2014 |
| Irfan Arshad Ltd | Wholesale & retail | 2025 |
| Iron Build Developments Ltd | Construction | 2025 |
| IRS Capital Ltd | Administrative & support | 2025 |
| ISH Outdoors CIC | Arts & recreation | 2026 |
| Isha Looks Ltd | Other services | 2026 |
| Ishop Group Ltd | Wholesale & retail | 2018 |
| Isla Raes Limited | Hospitality | 2025 |
| Islamic Libaas Ltd | Wholesale & retail | 2014 |
| ISM RAY ISA Gadgets Limited | Wholesale & retail | 2015 |
| Ismail & Sons Building & Roofing Contractors Ltd | Construction | 2002 |
| Isra Solutions Limited | Real estate | 2022 |
| Issumi Ltd | Wholesale & retail | 2018 |
| Issy Cold Food Services Ltd | Manufacturing | 2026 |
| Istanbul Barber Dewsbury Ltd | Other services | 2023 |
| Istanbul Fresh Bakery Ltd | Hospitality | 2022 |
| It-Dynamo Ltd | Information & communication | 2015 |
| Itechsoul Limited | Information & communication | 2025 |
| Iter Transport Ltd | Transport & logistics | 2025 |
| Itqan UL Quran Ltd | Education | 2025 |
| IU Logistics Ltd | Transport & logistics | 2025 |
| Iypco Ltd | Wholesale & retail | 2024 |
| J & G Arches Limited | Manufacturing | 2006 |
| J & N Gold Traders Ltd | Manufacturing | 2021 |
| J & S Transport Ltd | Manufacturing | 2015 |
| J & T Load Solutions Ltd | Construction | 2016 |
| J Dewhirst Ltd | Financial services | 2023 |
| J M Anhar Ltd | Hospitality | 2017 |
| J Online Purchases Ltd | Other services | 2019 |
| J Robinson Sheeting & Cladding Limited | Construction | 2011 |
| J&N Home Improvements Ltd | Construction | 2024 |
| J.F Online Distribution Ltd | Wholesale & retail | 2026 |
| J.Overend Groundworks Limited | Construction | 2017 |
| J.Thwaites Limited | Manufacturing | 1963 |
| JA Car Sales Ltd | Wholesale & retail | 2023 |
| Jack Callum Ltd | Manufacturing | 2023 |
| Jack Lister Limited | Financial services | 2017 |
| Jacmar Limited | Wholesale & retail | 1991 |
| Jacob Holdings(Uk) Ltd | Other services | 2023 |
| Jacomb Hoare (Bradford) Limited | Manufacturing | 1964 |
| Jaitun Urban UK Ltd | Wholesale & retail | 2022 |
| Jamaal Barbering Ltd | Other services | 2026 |
| James T Ltd | Extraterritorial | 2023 |
| Jamiatul Uloom Islamia Ltd | Professional & scientific | 2021 |
| Janjua Contractors Ltd | Transport & logistics | 2025 |
| Jaren Ltd | Health & social care | 2023 |
| Java Assets Ltd | Real estate | 2021 |
| Java Surgical Services Limited | Health & social care | 2021 |
| Jay-Be Holdings Limited | Financial services | 2023 |
| Jay-Be Limited | Manufacturing | 2008 |
| Jays Offlicence Ltd | Wholesale & retail | 2014 |
| JB CC Ltd | Transport & logistics | 2023 |
| JC Beds Ltd | Manufacturing | 2019 |
| JDB Management Dews Ltd | Real estate | 2020 |
| Jemmtec Limited | Manufacturing | 2009 |
| Jennings Roofing Limited | Construction | 1985 |
| Jesco Holdings Ltd | Financial services | 2021 |
| Jewels of Aqsa Ltd | Wholesale & retail | 2023 |
| JEZ Taylor Ltd | Construction | 2020 |
| Je’Taime Facepaints. Ltd | Wholesale & retail | 2025 |
| JGE Wholesale Limited | Administrative & support | 2015 |
| Jilling Gardens 1960 Limited | Financial services | 2014 |
| JK & NK Group Ltd | Health & social care | 2026 |
| JK Assessors Ltd | Administrative & support | 2024 |
| JKG Foods Ltd | Hospitality | 2025 |
| JL Bathrooms Ltd | Construction | 2025 |
| JLP Contractors Ltd | Construction | 2023 |
| JMR Sports Solutions Ltd | Arts & recreation | 2024 |
| Joalpe International UK Limited | Wholesale & retail | 1998 |
| Jodie Ounsley Ltd | Professional & scientific | 2023 |
| JOE Master Ltd | Construction | 2019 |