| Impact Data Systems Limited | Information & communication | 2013 |
| Impact DEN Ltd | Administrative & support | 2023 |
| Imran Halal Meat Ltd. | Wholesale & retail | 2011 |
| In-Situ Machining Consultants Ltd | Professional & scientific | 2018 |
| Inayat Health and Wellbeing Ltd | Professional & scientific | 2018 |
| Incentives-Uk Limited | Wholesale & retail | 2003 |
| Indalo Assist Ltd | Professional & scientific | 2024 |
| Independent Logistic Solutions Limited | Transport & logistics | 2012 |
| Independent Motor Group Ltd | Wholesale & retail | 2023 |
| Indigo Diversity Hub Limited | Health & social care | 2025 |
| Industrial Commodity Trading Ltd | Administrative & support | 2022 |
| Industrial Tech UK Limited | Administrative & support | 2021 |
| Infinitus Bespoke Interiors Limited | Construction | 2018 |
| Infinity Beauty Academy Ltd | Other services | 2024 |
| Infinity Energy Solutions Ltd | Construction | 2025 |
| Ingenuiti Ltd | Information & communication | 2010 |
| Ingham’S Diner Ltd | Hospitality | 2021 |
| Inhabitiq Ltd | Hospitality | 2025 |
| Inno Cloud Ltd | Information & communication | 2021 |
| Innolan Ltd | Professional & scientific | 2025 |
| Innolayer Ltd | Wholesale & retail | 2025 |
| INNOV8 Energy Ltd | Construction | 2020 |
| INNOV8TIVE Design Ltd | Construction | 2022 |
| Innovaide Limited | Professional & scientific | 2025 |
| Innovative Food Services Ltd | Hospitality | 2023 |
| Innovomed Ltd | Health & social care | 2024 |
| Inntouch Management Ltd | Administrative & support | 2025 |
| Inpowa Ltd | Information & communication | 2020 |
| Insignety Jewellery Limited | Wholesale & retail | 2019 |
| Insignety UK Limited | Wholesale & retail | 2017 |
| Inspiracare Ltd | Administrative & support | 2020 |
| Inspire (Your Property) Limited | Construction | 2010 |
| Inspire Management Solutions Ltd | Other services | 2023 |
| Inspire Parts Limited | Wholesale & retail | 2025 |
| Inspire to Train GX Ltd | Arts & recreation | 2016 |
| Inspireevolveevents Ltd | Administrative & support | 2023 |
| Installation Station Limited | Construction | 2026 |
| Instant-Competitions Limited | Arts & recreation | 2025 |
| Integra Solutions (NW) Limited | Professional & scientific | 2019 |
| Intelligent Technology Management Limited | Extraterritorial | 2015 |
| Intercard Limited | Manufacturing | 2003 |
| Interiors by R Limited | Wholesale & retail | 2025 |
| Interkultura Ltd | Education | 2023 |
| Interlicense Ltd | Professional & scientific | 2018 |
| International Cargo & Transport Ltd | Transport & logistics | 2025 |
| International Foundation for Overseas Pakistani's Ltd | Information & communication | 2019 |
| International Property Specialists Limited | Real estate | 2007 |
| Intex Interiors Limited | Construction | 2008 |
| Intransit Global Ltd | Transport & logistics | 2024 |
| Invest in Place Ltd | Real estate | 2020 |
| Invicta Enterprises Limited | Financial services | 2012 |
| Invirt Technologies Limited | Information & communication | 2024 |
| Inyoursoup Ltd | Administrative & support | 2013 |
| IP Four Digital Limited | Information & communication | 2020 |
| IP Four Property Services Limited | Real estate | 2024 |
| IP Sales Ltd | Construction | 2017 |
| IQ Play Limited | Construction | 2019 |
| Irene Transport (ITL) Ltd | Transport & logistics | 2025 |
| Irfan & Sons Ltd | Construction | 2025 |
| Iron Works Limited | Extraterritorial | 2005 |
| Isaac JM Associates Ltd | Extraterritorial | 2023 |
| Isabel and Young Ltd | Extraterritorial | 2022 |
| Isaiah Zehn Holdings Limited | Financial services | 2018 |
| Ishango Properties Limited | Real estate | 2020 |
| Isocode Ltd. | Information & communication | 2013 |
| Isoteca Ltd | Information & communication | 2022 |
| Istanbul Skewers Ltd | Hospitality | 2026 |
| Istbc Limited | Wholesale & retail | 2024 |
| It's My Party Ltd | Arts & recreation | 2004 |
| Itelegant Ltd | Construction | 2024 |
| Itfaaq Food Ltd | Hospitality | 2024 |
| Ivan Bowling (Enterprises) Limited | Real estate | 1977 |
| Ivory Gate Properties Limited | Real estate | 2026 |
| IVY House Development Ltd | Construction | 2003 |
| IWA Nagoh OME Ltd | Households | 1997 |
| Iwbri Limited | Wholesale & retail | 2022 |
| Iyla Legal Services Ltd | Professional & scientific | 2025 |
| IZ Solutions Limited | Other services | 2013 |
| J & K Supplies Limited | Wholesale & retail | 1998 |
| J & M Sherry Textiles Limited | Wholesale & retail | 2004 |
| J and M Precision Engineering Limited | Manufacturing | 2003 |
| J E S Tiling Limited | Construction | 2011 |
| J J Taste Limited | Hospitality | 2025 |
| J J'S @ the Dugdale Ltd | Hospitality | 2020 |
| J Kime Ltd | Construction | 2011 |
| J Norman Engineering Ltd | Construction | 2024 |
| J P M Burnley Limited | Wholesale & retail | 2026 |
| J Sanderson Ltd | Wholesale & retail | 2021 |
| J&R Roofing and Property Maintenance Ltd | Construction | 2026 |
| J&S Electrical and GAS Ltd | Construction | 2023 |
| J-Cug Services Limited | Administrative & support | 2008 |
| J-Lo's Hair Limited | Other services | 2006 |
| J. & D. Whelan Limited | Hospitality | 1964 |
| J. & J. Sharkey Limited | Wholesale & retail | 1978 |
| J. & S. Douglas (Farmers) Limited | Agriculture & fishing | 1980 |
| J.C.S Interiors Ltd | Construction | 2010 |
| J.D. Edwards Limited | Construction | 2004 |
| J.D.G. Properties (NW) Ltd | Real estate | 2017 |
| J.Douglas & Sons Limited | Financial services | 1965 |
| J.G. Coates (Burnley) Limited | Manufacturing | 1964 |