| IJA Tech Services Limited | Administrative & support | 2015 |
| Ijaz Medical Services Ltd | Professional & scientific | 2022 |
| Ijaz Property Ltd | Real estate | 2024 |
| IJC Consulting Services Ltd | Information & communication | 2018 |
| IJC Executive Travel & Transfers Limited | Transport & logistics | 2024 |
| Ijch Consulting Ltd | Professional & scientific | 2022 |
| IJH and Associates Limited | Financial services | 2025 |
| IJS Partners Ltd | Professional & scientific | 2012 |
| IK Solutions (Warrington) Limited | Information & communication | 2012 |
| Ikechi Limited | Information & communication | 2017 |
| IKM Living Limited | Construction | 2025 |
| IKO Planning Limited | Administrative & support | 2015 |
| Ikuna Topal Ltd | Transport & logistics | 2025 |
| Ikyle Limited | Information & communication | 2017 |
| IL Padrino Pizza and Kebab Ltd | Hospitality | 2023 |
| Ilex Consultancy Services Limited | Information & communication | 2015 |
| Ilex Interiors Limited | Construction | 2026 |
| Illem Properties Limited | Real estate | 2016 |
| Illion for MEN Ltd | Other services | 2024 |
| Illumaze Ltd | Information & communication | 2024 |
| ILM Engineering Limited | Professional & scientific | 2016 |
| Ilook Ltd | Wholesale & retail | 2023 |
| IM Outdoor Living Ltd | Construction | 2026 |
| Im.Brian Ltd | Other services | 2019 |
| Imaa Consultancy Ltd | Professional & scientific | 2018 |
| IMAGINE8 Creative Ltd. | Other services | 2006 |
| IMAGINE8 Ltd | Wholesale & retail | 1999 |
| IMB Engineering Limited | Professional & scientific | 2018 |
| IMC Data Limited | Professional & scientific | 2023 |
| IMD Engineering Ltd | Professional & scientific | 2019 |
| IME Solutions Ltd | Administrative & support | 2016 |
| IMG Engineering Ltd | Professional & scientific | 2021 |
| Imhotep Civil Engineering Ltd | Administrative & support | 2016 |
| Imiq LLP | | 2021 |
| IMK Commercial Management Ltd | Construction | 2017 |
| Immaculate Care Solutions Limited | Administrative & support | 2024 |
| Immaculate FC Limited | Other services | 2024 |
| Immaculate Painting Group Limited | Construction | 2025 |
| Immix Limited | Information & communication | 2015 |
| Immobilis Ltd | Real estate | 2026 |
| Impact Architecture and Project Management Limited | Professional & scientific | 2013 |
| Impact Fencing and Protection Services Ltd | Construction | 2018 |
| Impact Graphix and Signs Limited | Professional & scientific | 2011 |
| Impact Management Solutions Limited | Professional & scientific | 2005 |
| Impact Venture Solutions Limited | Information & communication | 2019 |
| Impact Warrington Ltd | Education | 2025 |
| Impala (UK) Limited | Professional & scientific | 1999 |
| Impeccable Ltd. | Transport & logistics | 2008 |
| Imperial Dog Training Ltd | Other services | 2025 |
| Imperial Emperor Chongqings Ltd | Wholesale & retail | 2024 |
| Imperial Gundogs Limited | Agriculture & fishing | 2022 |
| Imperial Miniatures Ltd | Manufacturing | 2021 |
| Imperial Restaurant (Lowton) Limited | Hospitality | 2017 |
| Imperium Consultency Ltd | Professional & scientific | 2026 |
| Imperium Safety Solutions Ltd | Education | 2025 |
| Impress Printing Services Ltd | Administrative & support | 2011 |
| Improve the Factory Limited | Administrative & support | 2020 |
| Improvement Journeys Ltd | Professional & scientific | 2011 |
| Imre Attila Ltd | Transport & logistics | 2018 |
| IMS Consulting Limited | Administrative & support | 2013 |
| Imustcare Ltd | Health & social care | 2024 |
| Imva Group Ltd | Wholesale & retail | 2023 |
| IN Hand Design Limited | Other services | 2012 |
| IN Silico Services Ltd | Administrative & support | 2024 |
| IN the Sky IT Ltd | Administrative & support | 2025 |
| IN Wellness Group Ltd | Health & social care | 2026 |
| In-Fridge Ltd | Extraterritorial | 2025 |
| In-Spec Technical Services Limited | Professional & scientific | 1999 |
| IN2 Windows and Doors (NW) Ltd | Construction | 2026 |
| Inara Talent Limited | Administrative & support | 2023 |
| Inardesco Limited | Information & communication | 2015 |
| Inavision Solutions Ltd | Manufacturing | 2019 |
| INB Property Management Ltd | Real estate | 2025 |
| INB Trading Ltd | Wholesale & retail | 2025 |
| Inburex (UK) Limited | Administrative & support | 1994 |
| Inc by Olga Ltd | Other services | 2024 |
| Incentivise Limited | Administrative & support | 2002 |
| Inceptus Solutions Limited | Information & communication | 2019 |
| Incle Limited | Professional & scientific | 2012 |
| Inclusion by Design Limited | Real estate | 2003 |
| Inclusive Sports 4 ALL Group Limited | Health & social care | 2024 |
| Inclusive Teaching Matters CIC | Education | 2014 |
| Incoderz Limited | Information & communication | 2011 |
| Incognito Services Ltd | Construction | 2019 |
| Incognito Strategies Limited | Professional & scientific | 2020 |
| Incorpleo Ltd | Information & communication | 2014 |
| Incorporated Civil Engineering Limited | Administrative & support | 2015 |
| Incrawable Limited | Administrative & support | 2025 |
| Incrementum Housing Development Company Limited | Real estate | 2019 |
| Incrementum Housing Management Company Limited | Real estate | 2019 |
| Inde Co Limited | Households | 2020 |
| Independent Commercial Limited | Real estate | 1998 |
| Independent Healthcare Procurement Limited | Administrative & support | 1994 |
| Independent Lifestyles (North West) Limited | Construction | 2008 |
| Independent Professional Consultants Private Limited | Information & communication | 2011 |
| Indian Flavour (NW) Limited | Hospitality | 2024 |
| Indian Tiffin RES Ltd | Hospitality | 2020 |
| Indie Imports Limited | Extraterritorial | 2021 |
| Indigo Lima Solutions Ltd. | Administrative & support | 2012 |
| Indigo Technology Services Limited | Information & communication | 2002 |