| Imaging X-Pert Ltd | Real estate | 2019 |
| Imam Mahdi Centre Ltd | Other services | 2019 |
| Imanzadeh Ltd | Wholesale & retail | 2025 |
| Imatech Holdings Limited | Financial services | 2024 |
| Imaze Tech Ltd | Other services | 2014 |
| IMC Management Consultants Limited | Professional & scientific | 1979 |
| Imcn Londres Ltd | Manufacturing | 2025 |
| IMD Consultancy (EU) Ltd | Professional & scientific | 2023 |
| Imdad Asgar Delivery Driver Limited | Transport & logistics | 2025 |
| IME Ltd | Professional & scientific | 2025 |
| Imed Saglik VE Ilac Sanayi Ltd | Wholesale & retail | 2025 |
| IMF Traders UK Ltd | Wholesale & retail | 2023 |
| Imfconsulting Limited | Administrative & support | 2011 |
| IMG Europe Ltd | Financial services | 2000 |
| Imgra Ltd | Professional & scientific | 2020 |
| Imiga Ltd | Hospitality | 2025 |
| Imin Liquidity UK Limited | Information & communication | 2025 |
| Imineval Ltd | Mining & quarrying | 2023 |
| Imitation Limited | Information & communication | 2000 |
| IMK Wholesale Ltd | Wholesale & retail | 2022 |
| IML Services Limited | Administrative & support | 2019 |
| Immaculate Resources Limited | Information & communication | 2012 |
| Immediate Invest International Ltd | Other services | 2024 |
| Immento Ltd | Professional & scientific | 2020 |
| Immerse Tech Ltd | Administrative & support | 2018 |
| Immersity Ltd | Information & communication | 2017 |
| Immigrationhq Limited | Information & communication | 2025 |
| Immitech Online Ltd | Other services | 2019 |
| Immix Research Ltd | Information & communication | 2019 |
| Immobilien Stiftung | Administrative & support | 2016 |
| Immoinvest Holding Ltd | Information & communication | 2018 |
| Immunobox Ltd | Hospitality | 2020 |
| Immunology Consulting Services Ltd | Health & social care | 2019 |
| Immunoserv Ltd | Professional & scientific | 2020 |
| IMMY891 Ltd | Wholesale & retail | 2025 |
| Immys Specialist Cars Limited | Wholesale & retail | 2015 |
| Imobillion Limited | Information & communication | 2009 |
| Imove Limited | Real estate | 2014 |
| Imovum Inc Ltd | Information & communication | 2023 |
| Impact Bar Supplies Limited | Wholesale & retail | 2019 |
| Impact Browser Ltd | Information & communication | 2020 |
| Impact Care Solutions Ltd | Education | 2020 |
| Impact Commerce Ltd | Wholesale & retail | 2026 |
| Impact Consortium Ltd | Professional & scientific | 2019 |
| Impact Energy Partners Ltd | Professional & scientific | 2025 |
| Impact IQ Marketing Ltd | Information & communication | 2026 |
| Impact Repairs and Servicing Ltd | Manufacturing | 2016 |
| Impactecom Ltd | Wholesale & retail | 2023 |
| Impera Group PC | | 2018 |
| Imperal Limited | Information & communication | 2026 |
| Imperatriz Ltd | Real estate | 2019 |
| Imperial Building Projects Ltd | Construction | 2024 |
| Imperial Construction Services Limited | Manufacturing | 2023 |
| Imperial Containers Limited | Wholesale & retail | 2016 |
| Imperial Contract Solutions Ltd | Financial services | 2018 |
| Imperial Exports Limited | Wholesale & retail | 2019 |
| Imperial Gleam Limited | Wholesale & retail | 2025 |
| Imperial Ground Rents Limited | Real estate | 2011 |
| Imperial House (Cardiff) Ltd | Administrative & support | 2014 |
| Imperial Lifts Services Limited | Construction | 2018 |
| Imperial Meats Catering Ltd | Wholesale & retail | 2020 |
| Imperial Property Cardiff Limited | Real estate | 2023 |
| Imperial Security Ltd | Administrative & support | 2015 |
| Imperial Sweets Ltd | Manufacturing | 2017 |
| Imperial Waste Ltd | Construction | 2018 |
| Imperial Wealth International Ltd | Financial services | 2017 |
| Imperial Wedding Organisers Limited | Hospitality | 2013 |
| Imperial Wharf FC Limited | Arts & recreation | 2019 |
| Imperio Povon Limited | Information & communication | 2015 |
| Imperious Investments Holding Limited | Professional & scientific | 2026 |
| Imperious UK Services Ltd | Wholesale & retail | 2021 |
| Impertis Ltd | Wholesale & retail | 2025 |
| Impi Design Ltd | Professional & scientific | 2020 |
| Impluse Hunt Ltd | Wholesale & retail | 2023 |
| Import Fruit (Cardiff) Limited | | 1990 |
| Importaciones Portugal Ltd | Mining & quarrying | 2021 |
| Important Solutions Ltd | Administrative & support | 2018 |
| Importex Iptx BR Ltd | Wholesale & retail | 2020 |
| Importting Ltd | Wholesale & retail | 2025 |
| Imprecise Package Limited | Manufacturing | 2021 |
| Impression One Ltd | Extraterritorial | 2017 |
| Impressions Builders Ltd | Construction | 2023 |
| Impresso Espresso Ltd | Hospitality | 2018 |
| Imprint Consulting and Training Ltd | Wholesale & retail | 2024 |
| Improve Staffing Ltd | Administrative & support | 2021 |
| Impulse Athletes Ltd | Real estate | 2017 |
| Impulse Immigration Limited | Professional & scientific | 2017 |
| Impulsem Limited | Information & communication | 2019 |
| IMR Accounting Firm Limited | Professional & scientific | 2025 |
| Imran IT Services Ltd | Information & communication | 2017 |
| Imran Prime Ltd | Wholesale & retail | 2025 |
| Imrich Girga Cleaning Services Ltd | Real estate | 2018 |
| IMS Cardiff Limited | Arts & recreation | 2017 |
| Imtao Ltd | Information & communication | 2019 |
| Imyh Ltd | Real estate | 2016 |
| IN & Chic Ltd | Wholesale & retail | 2019 |
| IN Builders Ltd | Construction | 2020 |
| IN Computers Limited | Information & communication | 2003 |
| IN OUT Trucks Limited | Transport & logistics | 2016 |
| IN Shops Spend , Save and Support (Wolverhampton) Limited | Wholesale & retail | 2022 |