| Impresa Care Ltd | Other services | 2026 |
| Impresa Wellbeing Ltd | Arts & recreation | 2024 |
| Impression Dental Laboratory Limited | Manufacturing | 2000 |
| Imran Roofing Services Ltd | Construction | 2025 |
| IN Good Company Caring Companions Ltd | Health & social care | 2022 |
| IN Record Media Limited | Information & communication | 2021 |
| IN Requiem Ltd | Other services | 2024 |
| IN the Doghouse (NW) Ltd | Extraterritorial | 2019 |
| IN the Zone Training Ltd | Other services | 2015 |
| In-Professional Development Ltd | Education | 2017 |
| Inata Ltd | Wholesale & retail | 2023 |
| Inaya Healthcare Ltd | Health & social care | 2025 |
| Inblow Digital Limited | Information & communication | 2025 |
| Ince Balti Kebab & Curry House Ltd | Hospitality | 2021 |
| Ince Family Properties Ltd | Real estate | 2026 |
| Ince Tech Limited | Wholesale & retail | 2024 |
| Ince WN Ltd | Wholesale & retail | 2025 |
| Incetant TAN Ltd | Other services | 2018 |
| Inci Handyman Ltd | Construction | 2020 |
| Incredible Group Limited | Wholesale & retail | 2019 |
| Incredible IT Ltd | Information & communication | 2021 |
| Incrementum Group Ltd | Financial services | 2024 |
| Indecom Services Ltd | Professional & scientific | 2020 |
| Independent Care Consultancy Limited | Administrative & support | 2023 |
| Independent Ltd | Professional & scientific | 2026 |
| Independent Methodist Association Incorporated(The) | Other services | 1907 |
| Indevor Green Estates Limited | Financial services | 2020 |
| Indexima Management Limited | Professional & scientific | 2024 |
| Indie Management Consultants Ltd | Professional & scientific | 2023 |
| Indie Sport Ltd | Arts & recreation | 2024 |
| Indiependence Wigan Ltd | Real estate | 2011 |
| Indigo Consultants Ltd | Professional & scientific | 2022 |
| Indigo Print Solutions Limited | Wholesale & retail | 2012 |
| Indulge Hair Salon Limited | Other services | 2013 |
| Industri-Matematik International Ltd | Administrative & support | 1999 |
| Industrial Asbestos Services Limited | Water & waste | 2015 |
| Industrial Strength Media Limited | Other services | 2009 |
| Inervia Ltd | Wholesale & retail | 2025 |
| Inetee Capital Ltd | Wholesale & retail | 2022 |
| Inetpay Online Service Ltd | Professional & scientific | 2022 |
| Infallible Aesthetics Ltd | Other services | 2020 |
| Inffree Ltd | Professional & scientific | 2023 |
| Infinite Schools Limited | Education | 2022 |
| Infiniti Plumbing and Heating Ltd | Construction | 2024 |
| Infinity Cheer & Dance CIC | Education | 2024 |
| Infinity Hair Limited | Other services | 2010 |
| Infinitymanagement Solutions Ltd | Professional & scientific | 2022 |
| Info on Hold Limited | Professional & scientific | 2010 |
| Infomedica (International) Limited | Information & communication | 2007 |
| Infomedica Limited | Education | 2015 |
| Inform People Limited | Administrative & support | 2011 |
| Infrastructure Transfer Solutions Limited | Construction | 2023 |
| Ingaunis Ltd | Transport & logistics | 2016 |
| Ingham Plastering Contractor Limited | Construction | 2022 |
| Ingham Properties Ltd | Real estate | 2024 |
| Inglenorth (Contracting) Limited | Administrative & support | 2009 |
| Inglewood Property Investments Limited | Real estate | 2018 |
| Ingram Estates Ltd | Households | 2018 |
| Ingram School Business Management Ltd | Education | 2021 |
| Ingram-Bates Ltd | Hospitality | 2024 |
| Inner Bull Limited | Wholesale & retail | 2025 |
| Inner City Relief Ltd | Health & social care | 2024 |
| Innochi Ltd | Extraterritorial | 2014 |
| Innotec Security Systems Ltd | Administrative & support | 2025 |
| Innovate Your Home Limited | Construction | 2014 |
| Innovative Learning Network Ltd | Education | 2011 |
| Innovative Pharmacy Solutions Limited | Other services | 2015 |
| Innovator Visa Consulting Limited | Professional & scientific | 2019 |
| Inside N OUT (North West) Limited | Construction | 2014 |
| Insight Booking Solutions Limited | Administrative & support | 2012 |
| Insight Management Consultants Limited | Professional & scientific | 2017 |
| Inspiration Island Limited | Professional & scientific | 2001 |
| Inspire Transformations Limited | Professional & scientific | 2018 |
| Inspiring Healthy Lifestyles | Arts & recreation | 2002 |
| Instaheat Solutions Limited | Extraterritorial | 2018 |
| Instalift Garage Equipment Ltd | Manufacturing | 2023 |
| Instasmile Trustee Limited | Administrative & support | 2021 |
| Instrument Design Limited | Professional & scientific | 2007 |
| Insulation Installations Ltd | Construction | 2025 |
| Insurance Services Training Limited | Administrative & support | 2003 |
| Insure ME Limited | Financial services | 2025 |
| Insured for Life Ltd | Financial services | 2025 |
| Insurserv Limited | Financial services | 2025 |
| INT. Sunset Limited | Professional & scientific | 2015 |
| Intec (U.K.) Limited | Administrative & support | 1983 |
| Integral Enterprise Solutions Ltd | Information & communication | 2010 |
| Integrated Digital Cctv Systems Limited | Administrative & support | 2002 |
| Integrity 28 Ltd | Financial services | 2025 |
| Intellievo UK Ltd | Information & communication | 2025 |
| Intelligent Legal Services Ltd | Wholesale & retail | 2019 |
| Intellitrak Security Solutions Limited | Administrative & support | 2020 |
| Inter Euro Ltd | Wholesale & retail | 2024 |
| Inter-Africa Trade and Consultancy Limited | Wholesale & retail | 2003 |
| Intereurope Foods Ltd. | Wholesale & retail | 1994 |
| Interface Advantage Limited | Information & communication | 2001 |
| Interhires Tech Ltd | Information & communication | 2022 |
| Interiorise Limited | Administrative & support | 2016 |
| Interlink Property Management Ltd | Households | 2026 |
| Intermaxum | Professional & scientific | 2023 |
| International Approval Limited | Administrative & support | 2020 |