| Independent Mortgage GUY Ltd | Financial services | 2017 |
| Independent Pathways Care Ltd | Health & social care | 2026 |
| Independent Services (IS) Limited | Other services | 2018 |
| Independent Strands Ltd | Other services | 2025 |
| Independent Technology Systems Limited | Information & communication | 1996 |
| Independent Truck Rental Limited | Administrative & support | 2025 |
| Independent Welding Services Limited | Manufacturing | 1985 |
| Indepth Films Ltd | Information & communication | 2015 |
| Index Compliance Limited | Financial services | 2013 |
| Index Medical Limited | Health & social care | 2009 |
| Index Microbiology Limited | Professional & scientific | 2012 |
| Indi-Phase Ltd | Financial services | 2019 |
| India MEE Jewellery Ltd | Manufacturing | 2024 |
| Indian Cottage Bristol Limited | Hospitality | 2024 |
| Indian Masala Takeaway Ltd | Hospitality | 2025 |
| Indian Summer Cafe LLP | | 2024 |
| Indian Walmart Limited | Hospitality | 2022 |
| Indie Plugin Ltd | Information & communication | 2024 |
| Indigo & Blue Limited | Financial services | 2011 |
| Indigo Archery Ltd | Arts & recreation | 2018 |
| Indigo Communications Limited | Professional & scientific | 2013 |
| Indigo Food Group Holdings Limited | Financial services | 2020 |
| Indigo Food Group Limited | Financial services | 2008 |
| Indigo Ghost Limited | Information & communication | 2021 |
| Indigo Installations Limited | Construction | 2024 |
| Indigo Network Limited | Other services | 2015 |
| Indigo RM Limited | Other services | 2014 |
| Indigo Science Ltd | Professional & scientific | 2011 |
| Indigo Verandas Limited | Manufacturing | 2024 |
| Indigo-Gt Performance Ltd | Wholesale & retail | 2017 |
| INDIGO41 Ltd. | Information & communication | 2005 |
| Indigogreen Limited | Real estate | 2021 |
| Indigoplex Limited | Information & communication | 2005 |
| Indio Black Ltd | Manufacturing | 2018 |
| Inditaps Ltd | Real estate | 2025 |
| Indo Property Ltd | Construction | 2022 |
| Indomexican Limited | Hospitality | 2020 |
| Indomitable Marine Services Ltd | Professional & scientific | 2020 |
| Indoor Multi Sport Limited | Arts & recreation | 1985 |
| Indoor Multi Sports Limited | Arts & recreation | 1994 |
| Indss Ltd | Extraterritorial | 2013 |
| Inductosense Limited | Professional & scientific | 2015 |
| Indulge Yourself Ltd | Wholesale & retail | 2020 |
| Induron Limited | Wholesale & retail | 2025 |
| Indus Cafe and Kitchen Ltd | Hospitality | 2023 |
| Industrial & Marine Coatings Ltd | Manufacturing | 2010 |
| Industrial Chemical Cleaners (Hull) Limited | | 1971 |
| Industrial Common Ownership Finance Limited | Financial services | 1973 |
| Industrial Common Ownership Fund PLC | Financial services | 1987 |
| Industrial Door and Gate Solutions Ltd | Manufacturing | 2020 |
| Industrial Door Systems (Southern) Limited | Extraterritorial | 2013 |
| Industrial Internet Solutions Ltd | Information & communication | 2003 |
| Industrial Manufacturing Engineering Services Limited | Professional & scientific | 2014 |
| Industrial Properties (Barton Hill) Limited | Real estate | 1959 |
| Industrial Real Estate Dissolved Limited Partnership | | 2012 |
| Industrial Roofing SW Ltd | Construction | 2026 |
| Industrial Training Networks Limited | Construction | 2017 |
| Industrial Workspace Specialists (IWS Group) Ltd | Professional & scientific | 2019 |
| Industrious 131 Finsbury Pavement Ltd | Real estate | 2024 |
| Industrious International Ltd | Real estate | 2020 |
| Industrious LON 15 Fitzroy Street Ltd | Real estate | 2025 |
| Industrious LON 24 Chiswell Ltd | Real estate | 2025 |
| Industrious LON 3 Westfield Avenue Ltd | Real estate | 2024 |
| Industrious LON 30 Crown Ltd | Real estate | 2023 |
| Industrious LON 70 ST. Mary's AXE. Ltd | Real estate | 2021 |
| Industrious LON 77 Coleman Street Ltd | Real estate | 2023 |
| Industrious LON Battersea Ltd | Real estate | 2025 |
| Industrious MAN Landmark 1 Oxford Street Ltd | Real estate | 2021 |
| Industrious Managed 15 Fitzroy Ltd | Real estate | 2026 |
| Industrious Managed UK Ltd | Real estate | 2025 |
| Industrious UK Holdings Ltd | Real estate | 2021 |
| Industrious UK Operations Ltd | Real estate | 2021 |
| Industry Bar & Kitchen Ltd | Hospitality | 2016 |
| Industry of US Limited | Professional & scientific | 2019 |
| Industry Training Network Ltd | Construction | 2013 |
| INDUSTRY42 Ltd | Professional & scientific | 2014 |
| Indzawo Ltd | Real estate | 2025 |
| Ineoquest Technologies Ltd | Information & communication | 2008 |
| Inertia Innovations Limited | Information & communication | 2024 |
| Inest Property Limited | Real estate | 2019 |
| Inevitable Complexity Limited | Information & communication | 2023 |
| Inez Woldman Animation Limited | Information & communication | 2015 |
| Ineō Leather Ltd | Manufacturing | 2024 |
| Infact Labs Ltd | Information & communication | 2026 |
| Infallible Jewels Limited | Manufacturing | 2026 |
| Infectious PR Ltd | Professional & scientific | 2011 |
| Inferno Cards Ltd | Wholesale & retail | 2021 |
| Infihelp Ltd | Wholesale & retail | 2024 |
| Infiinite Estates Ltd | Real estate | 2023 |
| Infiled UK Ltd. | Manufacturing | 2024 |
| Infincible Limited | Professional & scientific | 2021 |
| Infineon Technologies Reigate Limited | Wholesale & retail | 1958 |
| Infinite Codeworks Limited | Information & communication | 2010 |
| Infinite Development Group Ltd | Real estate | 2016 |
| Infinite Dreams Boutique Ltd | Extraterritorial | 2026 |
| Infinite Edge Productions Ltd | Professional & scientific | 2024 |
| Infinite Fibre Ltd | Information & communication | 2024 |
| Infinite Future Holdings Limited | Professional & scientific | 2002 |
| Infinite JL Ventures Limited | Construction | 2023 |
| Infinite Optimised Solutions Limited | Information & communication | 2019 |