| IN Car - on Bike Ltd. | Wholesale & retail | 2004 |
| IN Code Studios Limited | Information & communication | 2018 |
| IN Flow Training Ltd | Administrative & support | 2014 |
| IN House Construction York Limited | Construction | 2021 |
| IN Pursuit of the Trivial Limited | Professional & scientific | 2022 |
| IN Retrospecs Limited | Information & communication | 2014 |
| IN the Black Professional Services Limited | Professional & scientific | 2014 |
| IN Time Design and Installation Service Ltd | Construction | 2024 |
| IN Your Space Limited | Professional & scientific | 1999 |
| Inc DOT COM Limited | Manufacturing | 2000 |
| Inca Financial York Ltd | Financial services | 2021 |
| Inca Lets Ltd | Real estate | 2022 |
| Incartec Limited | Wholesale & retail | 2002 |
| Inclusic Ltd | Administrative & support | 2024 |
| Inclusion Group Limited | Financial services | 2020 |
| Inclusion Homes CIC | Real estate | 2020 |
| Inclusion Housing Community Interest Company | Real estate | 2007 |
| Inclusion Property Holdings Limited | Real estate | 2020 |
| Inclusive Equal Rights UK CIC | Public administration | 2022 |
| Inclusive Mind Health CIC | Education | 2026 |
| Inclusive Minds Ltd | Professional & scientific | 2017 |
| Incorporated Engineering Services Ltd | Administrative & support | 2014 |
| Incremental Ltd. | Information & communication | 2019 |
| Incremental Solutions Ltd | Information & communication | 2014 |
| Incrementum Consultancy Limited | Professional & scientific | 2019 |
| Independent Applied Policy and Practice Group LLP | | 2026 |
| Independent Dispense Services Limited | Hospitality | 2012 |
| Independent Domestic Abuse Services | Other services | 2003 |
| Independent Drinks Limited | Professional & scientific | 2011 |
| Independent Isuzu Ltd | Wholesale & retail | 2023 |
| Independent Life UK Limited | Information & communication | 2017 |
| Independent Truck & Trailer Ltd | Wholesale & retail | 2007 |
| Inderact Limited | Professional & scientific | 2015 |
| Indeval Ltd | Information & communication | 2025 |
| Indian Delight Ltd | Wholesale & retail | 2023 |
| Indigo Greens Estate Agents Ltd | Real estate | 2017 |
| Indigo Lake Limited | Real estate | 2018 |
| Indigojas Limited | Professional & scientific | 2012 |
| Indomito Properties LLP | | 2004 |
| Indoor Funfairs Limited | Other services | 2014 |
| Indus TECH2 Ltd | Wholesale & retail | 2024 |
| Industrial Blending Limited | Extraterritorial | 2009 |
| Industrial Textiles & Plastics Ltd | Manufacturing | 1989 |
| Infai U.K. Ltd. | Health & social care | 1995 |
| Infinity 123 Ltd | Real estate | 2023 |
| Infinity Acoustics Ltd | Professional & scientific | 2022 |
| Infinity Dance Company Ltd | Education | 2020 |
| Infinity Prize Draws Limited | Wholesale & retail | 2023 |
| Infinity Sphere Limited | Real estate | 2020 |
| Influ Social Ltd | Wholesale & retail | 2023 |
| Infojam Limited | Information & communication | 2013 |
| Infopie Ltd | Information & communication | 2024 |
| Information AS Material Ltd | Information & communication | 2025 |
| Infosecai Ltd | Information & communication | 2025 |
| Infosoil RIG Services Limited | Construction | 2014 |
| Infospatial Ltd | Information & communication | 2026 |
| Infrabox Consulting Limited | Professional & scientific | 2019 |
| Ingenting Limited | Information & communication | 2009 |
| Inggames Limited | Information & communication | 2010 |
| Ingleby (Barwick) Management Company Limited | Households | 2014 |
| Ingleby's Luxury Coaches Limited | Administrative & support | 1978 |
| Ingledew Media Ltd | Administrative & support | 2010 |
| Inglewood (Paignton) Management Company Limited | Households | 2023 |
| Ings Court (York) Management Company Limited | Households | 2004 |
| Ings View Service Station Limited | Wholesale & retail | 2003 |
| INK Tank Tattoo Ltd | Arts & recreation | 2019 |
| Inkco Limited | Information & communication | 2010 |
| Inkstone Living Limited | Hospitality | 2024 |
| Inman & Co Accountants Ltd | Professional & scientific | 2000 |
| Inman Property Ltd | Real estate | 2024 |
| Inn on the Green (York) Limited | Hospitality | 2025 |
| Inn the City Ltd | Real estate | 2019 |
| Inner Space Stations Limited | Wholesale & retail | 2004 |
| Inner Space Storage Ltd | Extraterritorial | 2020 |
| Innersense Aesthetics Limited | Health & social care | 2013 |
| Innersound Audio Ltd | Information & communication | 2013 |
| Innerspace Events Limited | Other services | 2018 |
| Innes Building Consultancy (York) Limited | Professional & scientific | 2024 |
| Innochain Limited | Extraterritorial | 2020 |
| Innovate Educate Limited | Education | 2002 |
| Innovate Electrical York Ltd | Construction | 2021 |
| Innovate Eleven Ltd | Administrative & support | 2021 |
| Innovate Media SW Limited | Professional & scientific | 2013 |
| Innovation & Product Management Limited | Administrative & support | 2023 |
| Innovation Counselling Ltd | Health & social care | 2024 |
| Innovation Delivered Ltd | Professional & scientific | 2020 |
| Innovation Property Group Ltd | Real estate | 2020 |
| Innovative Health Solutions Ltd | Wholesale & retail | 2024 |
| Innoventors Development Ltd | Professional & scientific | 2009 |
| Innoventors Ltd | Extraterritorial | 2012 |
| Innovus Management Ltd | Education | 2012 |
| Innoxink Ltd | Wholesale & retail | 2025 |
| Inscope JM Limited | Administrative & support | 2009 |
| Insetting Limited | Administrative & support | 2026 |
| Insighlytics Limited | Information & communication | 2009 |
| Insight Books Ltd | Professional & scientific | 2025 |
| Insight Security Solutions Ltd | Administrative & support | 2021 |
| Inspectus AI Ltd | Information & communication | 2026 |
| Inspeq. Source Inspection Ltd | Professional & scientific | 2025 |
| Inspirational Yorkshire Decor Ltd | Construction | 2025 |