| Indasol Limited | Extraterritorial | 2011 |
| Independent Care Solutions | Education | 2020 |
| Independent Design Engineering Consultants Ltd | Professional & scientific | 2000 |
| Independent Holidays Limited | Administrative & support | 2001 |
| Independent Optometry Services Limited | Wholesale & retail | 2024 |
| Independent Physio Ltd | Health & social care | 2016 |
| Independent Real Estate Limited | Real estate | 2026 |
| Inder Singh Brickwork Ltd | Construction | 2022 |
| Index (Machining) Limited | Manufacturing | 1997 |
| Indian Gypsy Limited | Wholesale & retail | 2016 |
| Indigo Azure Ltd | Professional & scientific | 2018 |
| Individual Finance Ltd | Financial services | 2018 |
| Individual Properties (Mids) Ltd | Real estate | 2020 |
| Indivista Ltd | Wholesale & retail | 2025 |
| Indoor and Outdoor Maintenance Ltd | Construction | 2023 |
| Indulgence Beauty Spot Ltd | Wholesale & retail | 2026 |
| Indulgence With Emma Limited | Other services | 2006 |
| Indus International Foods Limited | Wholesale & retail | 2010 |
| Indus World Foods Limited | Wholesale & retail | 2011 |
| Industrial Adhesive Solutions Limited | Wholesale & retail | 2005 |
| Industrial Brakes Limited | Manufacturing | 1984 |
| Industrial Exports (U.K.) Ltd | Administrative & support | 2025 |
| Industrial Press (Coventry) Limited | Manufacturing | 1948 |
| Industrial Recruitment Solutions Paye Limited | Administrative & support | 2020 |
| Industrial Scales (UK) Limited | Manufacturing | 2000 |
| Industrial Tyre Network Ltd | Wholesale & retail | 2015 |
| Industrial Valve Supplies Ltd | Professional & scientific | 2020 |
| Ineedflooring Ltd | Construction | 2022 |
| Inertia Investments Ltd | Real estate | 2013 |
| Ineuvo Limited | Information & communication | 2018 |
| Inez-Sue Limited | Health & social care | 2013 |
| Infamoussun Ltd | Transport & logistics | 2019 |
| Infexa Digital Ltd | Information & communication | 2026 |
| Infield Sports Holdings UK Ltd | Other services | 2013 |
| Infield Sports UK Limited | Administrative & support | 2025 |
| Infinirank Ltd | Information & communication | 2026 |
| Infinite Portfolios Ltd | Real estate | 2025 |
| Infinite Recycling Limited | Water & waste | 2025 |
| Infinity and Beyond Ltd. | Extraterritorial | 2017 |
| Infinity and Beyond Online Ltd | Wholesale & retail | 2024 |
| Infinity Auto Ltd | Wholesale & retail | 2022 |
| Infinity Building Services Ltd | Construction | 2023 |
| Infinity Collectables Ltd | Wholesale & retail | 2021 |
| Infinity Equity Ltd | Wholesale & retail | 2024 |
| Infinity Financial Advice Limited | Financial services | 2013 |
| Infinity Realty Ltd | Real estate | 2021 |
| Infinity Tuition Limited | Education | 2013 |
| Infinity Vacations Ltd | Administrative & support | 2023 |
| Infinix Traders Ltd | Wholesale & retail | 2026 |
| Influenceable Ltd | Professional & scientific | 2024 |
| Influendly Ltd | Information & communication | 2021 |
| Influmi Ltd | Professional & scientific | 2025 |
| Info Knights BPO Ltd | Education | 2026 |
| Info Race Limited | Other services | 2022 |
| Infocus Construction Ltd | Extraterritorial | 2016 |
| Infocus Fleet Ltd | Administrative & support | 2016 |
| Infocus Group Ltd | Administrative & support | 2016 |
| Infocus Homes Limited | Real estate | 2016 |
| Infocus Limited | Professional & scientific | 1995 |
| Infocus Management Services Limited | Administrative & support | 2024 |
| Infocus Personnel Ltd | Administrative & support | 2024 |
| Infocus Projects Ltd | Construction | 2017 |
| Infocus Resources Ltd | Construction | 2012 |
| Infocus Training Services Ltd | Extraterritorial | 2016 |
| Infotecq Solutions Ltd | Information & communication | 2025 |
| Infound CIC | Education | 2024 |
| Infra - Geopav Ltd | Construction | 2020 |
| Infraplant Ltd | Administrative & support | 2026 |
| Infro Heat Limited | Manufacturing | 1987 |
| Infused Nutrition & Aesthetics Limited | Health & social care | 2025 |
| Infyra Ltd | Information & communication | 2026 |
| ING Site Supplies Limited | Wholesale & retail | 2023 |
| Inhive Studio Ltd | Information & communication | 2026 |
| Inifinity Building Services Ltd | Construction | 2022 |
| Initel Limited | Information & communication | 2022 |
| Initial Fire & Electrical Limited | Administrative & support | 2016 |
| Initial Fire Systems Limited | Public administration | 2002 |
| Initial IT Ltd | Information & communication | 2018 |
| Initial IT Services Ltd | Wholesale & retail | 2014 |
| Initiatives for Regional and International Development | Education | 2019 |
| INK 2 Inspiration Ltd | Professional & scientific | 2025 |
| INK Experts Ltd | Wholesale & retail | 2019 |
| INK Express Limited | Other services | 2003 |
| INK Wolverhampton Ltd | Arts & recreation | 2025 |
| Inked Antler Ltd | Wholesale & retail | 2024 |
| Inkos Consultancy Ltd | Health & social care | 2025 |
| Inky G'S Tattoos Limited | Other services | 2011 |
| Inlex Locking Limited | Manufacturing | 1973 |
| Inline Autos Ltd | Wholesale & retail | 2025 |
| Inner Circle Concierge Ltd | Administrative & support | 2026 |
| Inner Empowerment CIC | Education | 2026 |
| Inner Psyche Collective Ltd | Health & social care | 2026 |
| Innomat Engineering Limited | Manufacturing | 2021 |
| INNOV8 Consulting Services Limited | Administrative & support | 2023 |
| Innovation Resource Ltd | Administrative & support | 2018 |
| Innovative Beauty Labs Ltd | Manufacturing | 2015 |
| Innovative Business Dynamics Limited | Professional & scientific | 2024 |
| Innovative Solutions INT Ltd | Construction | 2025 |
| Innovix Accounting Ltd | Professional & scientific | 2024 |
| Innovote Limited | Financial services | 2006 |