| Ilkley and District Good Neighbours | Other services | 2009 |
| Ilkley Autocare Limited | Wholesale & retail | 2015 |
| Ilkley Bath & TAP Ltd | Construction | 2025 |
| Ilkley BID Ltd | Other services | 2019 |
| Ilkley Brewing Co Limited | Manufacturing | 2025 |
| Ilkley Capital Limited | Professional & scientific | 2002 |
| Ilkley Car Wash Limited | Other services | 2023 |
| Ilkley Cinema Ltd | Information & communication | 2014 |
| Ilkley Community Enterprise Ltd | Professional & scientific | 2012 |
| Ilkley Construction Limited | Construction | 2025 |
| Ilkley Creative Ltd | Professional & scientific | 2023 |
| Ilkley Dental Care Limited | Health & social care | 2014 |
| Ilkley Dental Studio Ltd | Health & social care | 2021 |
| Ilkley Golf Club Limited | Arts & recreation | 2025 |
| Ilkley Green Room Ltd | Hospitality | 2024 |
| Ilkley Holdings Ltd | Transport & logistics | 2016 |
| Ilkley Hub Limited | Wholesale & retail | 2026 |
| Ilkley IT Services Ltd | Information & communication | 2005 |
| Ilkley Lawn Tennis & Squash Club Limited | Arts & recreation | 2012 |
| Ilkley Literature Festival Limited | Arts & recreation | 2022 |
| Ilkley Live Ltd | Arts & recreation | 2024 |
| Ilkley Manor House Trust | Arts & recreation | 2017 |
| Ilkley Mobiles Ltd | Wholesale & retail | 2017 |
| Ilkley Moor Properties Limited | Real estate | 2024 |
| Ilkley Moor Trichology Ltd | Health & social care | 2026 |
| Ilkley Moor Vaults Limited | Hospitality | 2014 |
| Ilkley MOT & Service Station Limited | Wholesale & retail | 2003 |
| Ilkley Motor Company Ltd | Wholesale & retail | 2018 |
| Ilkley Physiotherapy Limited | Health & social care | 2016 |
| Ilkley Playhouse Limited | Arts & recreation | 2003 |
| Ilkley Professional Services Limited | Professional & scientific | 2021 |
| Ilkley Property Ltd | Real estate | 2025 |
| Ilkley Property Solutions 2 Limited | Professional & scientific | 2023 |
| Ilkley Property Solutions Limited | Professional & scientific | 2010 |
| Ilkley Rugby Football Club (Trading and Supporters Group) Limited | Arts & recreation | 2016 |
| Ilkley Scalp Clinic Ltd | Other services | 2024 |
| Ilkley Taxis (Transport Services) Ltd | Health & social care | 2019 |
| Ilkley Taxis 24/7 Ltd | Transport & logistics | 2019 |
| Ilkley Wellness Limited | Other services | 2019 |
| Ilkleyhc Ltd | Administrative & support | 2024 |
| Iltsc Events Limited | Arts & recreation | 2015 |
| IM4U Interior Design Ltd | Professional & scientific | 2025 |
| Improve Agency Ltd. | Professional & scientific | 2012 |
| Improving Impact Limited | Education | 2017 |
| Inception Property Consultants Limited | Professional & scientific | 2019 |
| Incito Coaching Limited | Administrative & support | 2008 |
| Incuto Limited | Information & communication | 2016 |
| Incuto Services Limited | Information & communication | 2024 |
| Independent Financial Publications Limited | Extraterritorial | 1993 |
| Independent Insight Consulting Limited | Professional & scientific | 2010 |
| Indigoworks North Ltd | Professional & scientific | 2024 |
| Infact UK Limited | Information & communication | 2003 |
| Inflect Records Limited | Arts & recreation | 2019 |
| Inform Marketing Services Limited | Professional & scientific | 2001 |
| Ingwermat Limited | Professional & scientific | 2003 |
| Inishdawee Ltd | Real estate | 2025 |
| Inn Fidelity Ltd | Professional & scientific | 2021 |
| Innectis Limited | Professional & scientific | 2022 |
| Innovest Property Limited | Real estate | 2025 |
| Innovo Business Services Ltd | Administrative & support | 2024 |
| Inspired Representation Ltd | Administrative & support | 2026 |
| Integrated Growth Ltd | Professional & scientific | 2024 |
| Intelligent Waste Solutions Limited | Water & waste | 2019 |
| Interiors of Ilkley Ltd | Wholesale & retail | 2024 |
| International Wine Limited | Wholesale & retail | 2020 |
| Intrinsic Properties (Holdings) Limited | Real estate | 1987 |
| Investment Property Services Ltd | Real estate | 2025 |
| Invisi Board Limited | Professional & scientific | 2024 |
| Irondane Limited | Real estate | 1985 |
| ISC Sales & Marketing Ltd | Other services | 2014 |
| Isola Consult Limited | Professional & scientific | 2026 |
| Isola Holdings Limited | Financial services | 2026 |
| IT Thermal Management Limited | Financial services | 2025 |
| It's Your Move Ilkley Limited | Transport & logistics | 2012 |
| It's Your Move Properties Limited | Real estate | 2025 |
| Italian Furniture Discount Stores Ltd | Other services | 2019 |
| Iyca CIC | Other services | 2016 |
| J Beckett Psychotherapy Ltd | Health & social care | 2023 |
| J C Inns (Yorkshire) Limited | Wholesale & retail | 2008 |
| J Garon Ltd | Professional & scientific | 2016 |
| J Kendall ACA Limited | Professional & scientific | 2020 |
| J O Pitt Property Limited | Professional & scientific | 2025 |
| J P Walker Developments Limited | Construction | 2016 |
| J Priestley & Associates Ltd | Professional & scientific | 2023 |
| J Reserve Ilkley Limited | Hospitality | 2018 |
| J Shaw Construction Ltd | Construction | 2023 |
| J W Management Solutions Limited | Professional & scientific | 2014 |
| J W Supply Chain Solutions Ltd | Other services | 2025 |
| J&B Media Ltd | Arts & recreation | 2012 |
| J&S Residential Lets Limited | Real estate | 2021 |
| J. Garside Stockcheck Ltd | Professional & scientific | 2022 |
| J.A. Sourcing Ltd | Professional & scientific | 2006 |
| J.M (Admin Services) Limited | Professional & scientific | 2015 |
| J2MPO Limited | Extraterritorial | 2011 |
| JA20 Limited | Other services | 2017 |
| Jackson Tree Services Limited | Administrative & support | 2015 |
| Jake Angel Ltd | Information & communication | 2021 |
| James Burrows Limited | Wholesale & retail | 1959 |
| James K Wilson Properties Ltd | Real estate | 2020 |
| Jane Cranley Consulting Limited | Administrative & support | 2016 |