| Ice Business Support Services Limited | Professional & scientific | 2014 |
| Iconic Bhangra Ltd | Other services | 2025 |
| Iconic Prints Limited | Manufacturing | 2017 |
| ID Global Ltd | Administrative & support | 2024 |
| Iddris & SON Limited | Transport & logistics | 2023 |
| Ideabetter Limited | Households | 1990 |
| Ideal & W R S Company Ltd | Manufacturing | 1946 |
| Ideal Logistics & Distribution Limited | Transport & logistics | 2019 |
| Ideal Mobile Junction Ltd | Wholesale & retail | 2018 |
| Ideal Property Services & Investments Ltd | Real estate | 2024 |
| Ideal Saddle Company Limited | Manufacturing | 2005 |
| Ideal Smile Limited | Health & social care | 2013 |
| Ideal Trucks Ltd | Wholesale & retail | 2012 |
| Identidot (Data Services) Limited | Information & communication | 2007 |
| Idiomatic Solutions Ltd | Households | 2026 |
| Idueyes Cabz Limited | Transport & logistics | 2026 |
| IDV Enterprise Limited | Information & communication | 2015 |
| IDX Limited | Manufacturing | 1998 |
| Idyllic Hair & Skin Ltd | Wholesale & retail | 2024 |
| IF Estates Ltd | Real estate | 2025 |
| Ifloor (Midlands) Limited | Wholesale & retail | 2016 |
| IG4 Services Ltd | Health & social care | 2023 |
| IGB Logistics Services Ltd | Professional & scientific | 2025 |
| Ignite Phoenix Limited | Professional & scientific | 2023 |
| IGP Birmingham Limited | Real estate | 2018 |
| IH Consultancy Ltd | Professional & scientific | 2025 |
| IHA Surveyors Limited | Professional & scientific | 2015 |
| IHS Dispensing Limited | Health & social care | 2017 |
| IIU Properties Ltd | Real estate | 2018 |
| Ijac Ltd | Wholesale & retail | 2024 |
| IJF Joinery Ltd | Manufacturing | 2023 |
| IJL Plumbing & Heating Limited | Construction | 2011 |
| IK & ST Limited | Health & social care | 2013 |
| IK Enterprises Limited | Real estate | 2019 |
| Ikandoo Ltd | Construction | 2023 |
| Ikefam Driving School Ltd | Education | 2024 |
| IKH Legal Ltd | Professional & scientific | 2021 |
| IKJ Ltd | Information & communication | 2011 |
| IKN Trading Ltd | Financial services | 2026 |
| Ikon Rooflights Limited | Extraterritorial | 2023 |
| Ikonicclean Ltd | Administrative & support | 2024 |
| Ikonik Property Group Limited | Real estate | 2025 |
| Ikonikproperties Limited | Real estate | 2025 |
| Ikraam ALI Ltd | Construction | 2025 |
| Ilarian Ventures Limited | Wholesale & retail | 2025 |
| Ildiko Caterers Limited | Hospitality | 2020 |
| Illuminate Skin Clinics Ltd | Health & social care | 2014 |
| ILM Staffing Solutions Ltd | Administrative & support | 2026 |
| ILM Training Hub Ltd | Education | 2025 |
| Ilumia Renos Ltd | Real estate | 2024 |
| Imaan Medical Services Limited | Health & social care | 2005 |
| Imacc & Co Limited | Professional & scientific | 2022 |
| Image Mobile Barbering Ltd | Other services | 2020 |
| Imagine Glazing Ltd | Construction | 2023 |
| Imaging Services (GB) Limited | Administrative & support | 1997 |
| Iman Wali Limited | Hospitality | 2016 |
| Imatter Walsall CIC | Public administration | 2020 |
| Imex Estates Holdings Limited | Financial services | 2026 |
| Imex Estates Limited | Real estate | 2020 |
| IMG Property Investments Ltd | Real estate | 2022 |
| IMH Carpentry Limited | Construction | 2006 |
| IMH Private Finance Ltd | Real estate | 2016 |
| Imidr Ltd | Transport & logistics | 2025 |
| Imjust Investments Limited | Real estate | 2024 |
| IMK Care and Cleaning Services Ltd | Administrative & support | 2025 |
| Immerse Asset Management Limited | Extraterritorial | 1993 |
| Immortal Light Ltd | Manufacturing | 2025 |
| IMO Graphics Limited | Manufacturing | 2005 |
| Impact Carpets, Floors and Beds Ltd | Wholesale & retail | 2023 |
| Impact Commercial Solutions Limited | Wholesale & retail | 2001 |
| Impact Outdoor Media Ltd | Professional & scientific | 2020 |
| Impact Particles Ltd | Wholesale & retail | 2022 |
| Impact Therapy Ltd | Health & social care | 2021 |
| Impact Travel Consultants Limited | Information & communication | 2024 |
| Impalloy Holdings Limited | Professional & scientific | 2005 |
| Impalloy Limited | Extraterritorial | 2024 |
| Imperial Accounting Solutions Limited | Professional & scientific | 2022 |
| Imperial Detailing Walsall Ltd | Administrative & support | 2023 |
| Imperial Fires Limited | Extraterritorial | 1994 |
| Imperial Landscaping Limited | Administrative & support | 2026 |
| Imperial Nexus Limited | Professional & scientific | 2025 |
| Imperial Pharmacy Limited | Professional & scientific | 2020 |
| Imperial Residential Limited | Real estate | 2014 |
| Imperial Residential Management Limited | Households | 2014 |
| Imperial Roofing and Home Improvements Limited | Construction | 2024 |
| Imperium Haulage Ltd | Manufacturing | 2025 |
| Imperium Medical Limited | Health & social care | 2017 |
| Imperium Nexus Limited | Financial services | 2021 |
| Impex Logistic Service Limited | Transport & logistics | 2015 |
| Import Express Ltd | Wholesale & retail | 2023 |
| Impressum (UK) Ltd | Administrative & support | 2005 |
| Improbus Ltd | Construction | 2023 |
| IMT Wealth Management Limited | Financial services | 2015 |
| IN School Tuition Ltd | Administrative & support | 2016 |
| IN Telford Limited | Arts & recreation | 2023 |
| IN the Shade Ltd | Wholesale & retail | 2020 |
| IN Touch With Limited | Administrative & support | 2013 |
| IN2COLOUR Limited | Education | 2020 |
| Incisive Limited | Administrative & support | 2005 |
| Incite Future Assets Limited | Financial services | 2023 |