| I LET Property Ltd | Real estate | 2025 |
| I-Care Younique Ltd | Health & social care | 2010 |
| I.M.T. (U.K.) Limited | Manufacturing | 1992 |
| Ideal Car Rentals Ltd | Administrative & support | 2022 |
| Ideas Depository Limited | Information & communication | 2021 |
| IJW (Yorkshire) Limited | Wholesale & retail | 2025 |
| Imagine Homes Ltd | Real estate | 2016 |
| Imont Ltd | Professional & scientific | 2022 |
| Impact Care Training Ltd | Public administration | 2023 |
| Impaqt Care Solutions Ltd | Health & social care | 2019 |
| Inclusion Pathway Limited | Education | 2025 |
| Indalo Properties Ltd | Real estate | 2020 |
| Infinite Care Homes Ltd | Health & social care | 2018 |
| Infinite Outdoors Ltd | Construction | 2017 |
| Infinitytradehub Ltd | Wholesale & retail | 2024 |
| Infox Technologies Ltd | Manufacturing | 2009 |
| Infrared Inspections Ltd | Wholesale & retail | 2023 |
| ING Consulting Limited | Professional & scientific | 2016 |
| Inky Dink Limited | Wholesale & retail | 2020 |
| Innovatech Business Solutions Ltd | Wholesale & retail | 2024 |
| Insight Therapy Services Ltd | Health & social care | 2019 |
| Instant Logistics Ltd | Wholesale & retail | 2024 |
| Interior Solutions 247 Limited | Construction | 2020 |
| Investment and Business Mortgage Company LLP | | 2008 |
| Investments Woodcock Limited | Professional & scientific | 2021 |
| Itverse Technology Services Ltd | Information & communication | 2023 |
| J & M Prestige Roofing Limited | Construction | 2023 |
| J & P Walker Limited | Administrative & support | 2009 |
| J Armstrong Limited | Public administration | 2016 |
| J P Baldwin Electrical Ltd | Energy | 2017 |
| J R Emmott Properties Limited | Construction | 2012 |
| J Walker Collectibles Limited | Wholesale & retail | 2023 |
| J&G Electric Gates Limited | Manufacturing | 2020 |
| J.A. Ward and SON Limited | Construction | 1978 |
| Jackson Firth Ltd | Real estate | 2025 |
| Jackson Solutions Limited | Information & communication | 2010 |
| Jasimaging Ltd | Health & social care | 2022 |
| Java Production Estates Ltd | Real estate | 2017 |
| Java Productions Ltd | Other services | 2014 |
| JAY Beez Ltd | Other services | 2003 |
| JBF Print Limited | Manufacturing | 2013 |
| JC Plumbing & Property Limited | Construction | 2023 |
| JCH Electrical Services Limited | Construction | 2011 |
| Jcheff Ltd | Professional & scientific | 2025 |
| JCP11 Investments Ltd | Financial services | 2020 |
| Jeco Software Ltd | Professional & scientific | 2023 |
| Jeks Ltd | Professional & scientific | 2019 |
| Jenny Watson Designs Limited | Arts & recreation | 2012 |
| Jess Wright Graphics Limited | Professional & scientific | 2008 |
| Jessgrove Limited | Wholesale & retail | 1979 |
| JH15 Ltd | Real estate | 2025 |
| JJB Joinery Limited | Manufacturing | 2024 |
| JKW Investments Ltd | Real estate | 2011 |
| JLF Heating Ltd | Construction | 2025 |
| JM Mortgage & Protection Limited | Financial services | 2019 |
| Jmhr Associates Ltd | Professional & scientific | 2025 |
| JOE 11T Ltd | Information & communication | 2022 |
| Joe's Club Ltd | Education | 2019 |
| John Gavin Business Sales Ltd | Administrative & support | 2021 |
| Joseph & Dean Limited | Professional & scientific | 2017 |
| Josie Wood Wellness Ltd | Wholesale & retail | 2026 |
| Jowett Cars Limited | Wholesale & retail | 1985 |
| JP Carpentry and Joinery Services Ltd | Real estate | 2018 |
| Julie Atkinson ANP Ltd | Health & social care | 2018 |
| JVN Property Developments Ltd | Households | 2021 |
| JW Elite Sports Coaching Ltd | Arts & recreation | 2026 |
| JXN Systems Limited | Information & communication | 2011 |
| JZK Cola Ltd | Wholesale & retail | 2024 |
| K & M Building Contractors Ltd | Construction | 2017 |
| Kamico Apparel Limited | Extraterritorial | 2015 |
| Kamico Limited | Wholesale & retail | 2002 |
| Kankom Limited | Financial services | 2024 |
| Kartal Associates Ltd | Health & social care | 2025 |
| Kavic Ltd | Hospitality | 2023 |
| Kears Incorporated Limited | Information & communication | 2021 |
| Kebabranch Ltd | Hospitality | 2025 |
| Keighley Storage Solutions Limited | Other services | 2014 |
| Keighley Training Consortium Limited | Education | 1985 |
| Kelly Developments (UK) Limited | Construction | 2004 |
| KEN and David Ltd | Professional & scientific | 2026 |
| Keylighting Limited | Manufacturing | 1984 |
| Kidspiration Childcare and Education Limited | Education | 2013 |
| Kingsley Capital (Corporate Member) Limited | Financial services | 2012 |
| Kingsoak Limited | Construction | 1966 |
| Kiys Consultancy Ltd | Professional & scientific | 2026 |
| Kizic Limited | Wholesale & retail | 2013 |
| Kleanitall Ltd | Administrative & support | 2013 |
| Kream & Co Interiors Limited | Wholesale & retail | 2025 |
| Kristian Mihalcik Delivery Ltd | Transport & logistics | 2026 |
| KS Joinery & Building Services Ltd | Construction | 2019 |
| L & L Dental Products Ltd | Wholesale & retail | 2020 |
| L & R (Consultancy) Limited | Information & communication | 2007 |
| Lady Lane Park School Limited | Education | 2015 |
| Ladyhill Property Rentals Limited | Real estate | 2026 |
| Lakeside Taxis Ltd | Extraterritorial | 2018 |
| Lakeside Travel Services Ltd | Transport & logistics | 2013 |
| Lakshmi PVT Limited | Professional & scientific | 2019 |
| Lamext Ltd | Wholesale & retail | 2025 |
| Landscope Construction Limited | Construction | 2019 |
| Langlands Meadow Apartments Limited | Real estate | 2016 |