| Infinite Creative Limited | Information & communication | 2014 |
| Infinite Design Limited | Professional & scientific | 2022 |
| Infinite Innovate Ltd | Wholesale & retail | 2024 |
| Infinite Locus Limited | Information & communication | 2025 |
| Infinite Maintenance Ltd | Construction | 2022 |
| Infinite Supplies Ltd | Wholesale & retail | 2025 |
| Infinite Tech Soultions Ltd | Wholesale & retail | 2024 |
| Infinite Testing Services Ltd | Information & communication | 2020 |
| Infinite Textile (UK) Ltd | Water & waste | 2014 |
| Infinite Ultrasound Services (IUS) Limited | Public administration | 2025 |
| Infiniti Code Ltd | Information & communication | 2022 |
| Infiniti Energi Ltd | Administrative & support | 2014 |
| Infiniti Roadshow Limited | Arts & recreation | 2012 |
| Infinitinc Ltd | Information & communication | 2018 |
| Infinitive Investments Ltd | Financial services | 2024 |
| Infinity 32 Ltd | Real estate | 2023 |
| Infinity Build Solution Ltd | Construction | 2024 |
| Infinity Commodity Traders Ltd | Wholesale & retail | 2023 |
| Infinity Direct UK Limited | Information & communication | 2006 |
| Infinity Dream Holidays Ltd | Administrative & support | 2025 |
| Infinity ENG Ltd | Professional & scientific | 2024 |
| Infinity Fire Services Limited | Construction | 2020 |
| Infinity Group Estates Ltd | Health & social care | 2022 |
| Infinity Group Pharmaceuticals Ltd | Wholesale & retail | 2024 |
| Infinity Group Property Ltd | Real estate | 2026 |
| Infinity Invest Ltd | Real estate | 2019 |
| Infinity IT Group Ltd | Information & communication | 2024 |
| Infinity Leics Limited | Health & social care | 2020 |
| Infinity Medical Clinics Limited | Health & social care | 2023 |
| Infinity Medical Group Ltd | Health & social care | 2019 |
| Infinity of Divinity Ltd | Administrative & support | 2016 |
| Infinity Propco Ltd | Real estate | 2023 |
| Infinity Recruitment International Limited | Administrative & support | 2001 |
| Infinity Regent Road Ltd. | Hospitality | 2019 |
| Infinity Service and Solutions Limited | Professional & scientific | 2016 |
| Infinity Stone Installations Ltd | Construction | 2022 |
| Infinity Toy Tronics Ltd | Manufacturing | 2024 |
| Infinium Properties Limited | Real estate | 2024 |
| Inflamat Limited | Wholesale & retail | 2007 |
| Inflow Heating Services Ltd | Construction | 2020 |
| Influential Success Ltd | Wholesale & retail | 2025 |
| Influx Digital Solutions Limited | Information & communication | 2022 |
| Info Planet Ltd | Professional & scientific | 2014 |
| Infonova Solutions Limited | Information & communication | 2024 |
| Infospoke Ltd | Administrative & support | 2025 |
| Infotecks Management Limited | Information & communication | 2026 |
| Infotricity Ltd | Information & communication | 2015 |
| Infra Advisory Ltd | Extraterritorial | 2015 |
| Infra-Build Consultants Limited | Professional & scientific | 2022 |
| Infrastructure Skills Ltd | Professional & scientific | 2026 |
| Infrastructure Solutions Ltd | Construction | 2026 |
| Infraweb Holdings Limited | Financial services | 2021 |
| Infuse Consulting Limited | Information & communication | 2002 |
| Infused Trading Ltd | Wholesale & retail | 2022 |
| Infy Distribution Ltd | Wholesale & retail | 2025 |
| Ingar Corp Ltd | Information & communication | 2025 |
| Ingenious Financial Solutions Ltd | Financial services | 2016 |
| Ingenious Learning Ltd | Education | 2016 |
| Ingenix Associates Limited | Manufacturing | 1994 |
| INGENNOV8 Limited | Professional & scientific | 2023 |
| Ingenuity Gardens Limited | Administrative & support | 2023 |
| Ingham Intelligent Solutions Ltd | Other services | 2014 |
| Ingleby (1245) Limited | Construction | 1999 |
| Ingleby Logistics Ltd | Transport & logistics | 2014 |
| Ingram Holdings Limited | Administrative & support | 2017 |
| Ingredily Technologies Ltd | Information & communication | 2025 |
| Inher Circ. Ltd | Wholesale & retail | 2025 |
| Inheritance Medical Limited | Health & social care | 2015 |
| Inhibition Group Limited | Financial services | 2025 |
| Inhibition UK Limited | Wholesale & retail | 2023 |
| Inhibition Venues Limited | Hospitality | 2025 |
| Inhouse Foods Ltd | Hospitality | 2017 |
| INK Creative Design Limited | Professional & scientific | 2018 |
| INK Depot Limited | Wholesale & retail | 2022 |
| INK Design & Print Limited | Manufacturing | 2019 |
| INK Drawn Architecture Limited | Professional & scientific | 2025 |
| INK Xperts Ltd | Wholesale & retail | 2019 |
| Ink/Drawn Global Limited | Professional & scientific | 2014 |
| Inkerman Lodge Farm Limited | Agriculture & fishing | 2019 |
| Inkkut Limited | Manufacturing | 2024 |
| Inkling Arts Ltd | Arts & recreation | 2014 |
| Inkling Print Ltd | Manufacturing | 2025 |
| Inkwink Limited | Wholesale & retail | 2024 |
| Inkymole Ltd | Arts & recreation | 2010 |
| Inland Investments Limited | Real estate | 1961 |
| Inlighten Ltd. | Manufacturing | 2017 |
| INM Trading Ltd | Health & social care | 2020 |
| Inmaco Ceramics Limited | Wholesale & retail | 2023 |
| Inmo Patel Ltd | Real estate | 2020 |
| Inn Consulting Ltd | Information & communication | 2024 |
| Inn Stays Management Ltd | Real estate | 2025 |
| Inn Your Community Ltd | Hospitality | 2014 |
| Inna Beauty Lounge Limited | Health & social care | 2025 |
| Inner Beauty Leicester Ltd | Other services | 2026 |
| Inner Vision Construction Limited | Construction | 2013 |
| Innersource Consultancy Limited | Information & communication | 2023 |
| Innerspace Leicester Ltd | Manufacturing | 2021 |
| Innes England (1993) Limited | Professional & scientific | 1991 |
| Innes England Limited | Real estate | 1997 |
| Inno House Ltd | Wholesale & retail | 2022 |