| IN Style Beauty Salon Ltd | Wholesale & retail | 2020 |
| IN2 Event Productions Ltd | Construction | 2024 |
| IN2ITIVE Business Solutions Limited | Information & communication | 2009 |
| IN2MITA Ltd | Wholesale & retail | 2026 |
| Inaaya Property Investments Ltd | Real estate | 2026 |
| Inalav Ltd | Real estate | 2020 |
| Inali Napowsa Clinical Services Limited | Professional & scientific | 2017 |
| Inandout Civils Ltd | Information & communication | 2024 |
| Inayat ALI Enterprise Ltd | Administrative & support | 2017 |
| Inbox Security Limited | Administrative & support | 2024 |
| Incarepartners Ltd | Administrative & support | 2025 |
| Incept Innovation Limited | Professional & scientific | 2017 |
| Incisive Property Development Ltd | Real estate | 2016 |
| Incline Campers Ltd | Manufacturing | 2021 |
| Inclusion (Supported Living) Ltd | Health & social care | 2022 |
| Inclusive and Proactive Care UK Limited | Health & social care | 2016 |
| Incredible Bakery Company Limited | Manufacturing | 2013 |
| Incredible Housekeeping Limited | Administrative & support | 2017 |
| Increscent Tech Ltd | Information & communication | 2025 |
| Independent Advisory Partners Ltd | Professional & scientific | 2026 |
| Independent Lettings Limited | Real estate | 2019 |
| Independent OT Service Limited | Education | 2025 |
| Index Support Services UK Ltd | Wholesale & retail | 2018 |
| Indi Stones Limited | Wholesale & retail | 2004 |
| Indian Chef (QA) Ltd | Hospitality | 2026 |
| Indiebites Limited | Hospitality | 2025 |
| Indigo Mental Club Limited | Education | 2022 |
| Indigo Sixty Ltd | Information & communication | 2023 |
| Indigo Star Properties Ltd | Real estate | 2025 |
| Indigo Tower One Ltd | Real estate | 2025 |
| Indigro Limited | Agriculture & fishing | 2011 |
| Indra Mobility UK, Ltd. | Information & communication | 2025 |
| Indus Homes Limited | Professional & scientific | 2004 |
| Industrial Distribution Limited | Manufacturing | 2025 |
| Industrial PVC Curtains Limited | Wholesale & retail | 2012 |
| Industry Music Ltd | Administrative & support | 2003 |
| Infia UK Limited | Wholesale & retail | 1997 |
| Infinite Accounting Ltd | Professional & scientific | 2024 |
| Infinite Consultancy Services Ltd | Administrative & support | 2025 |
| Infinite Engineering Consultancy Limited | Administrative & support | 2024 |
| Infiniti Capital Partners Ltd | Financial services | 2013 |
| Infinity Accounting Ltd | Professional & scientific | 2025 |
| Infinity Building & Development Service Limited | Construction | 2021 |
| Infinity Corporation Ltd | Wholesale & retail | 2026 |
| Infinity Enterprises(Uk) Limited | Construction | 2024 |
| Infinity Finance Ltd | Professional & scientific | 2018 |
| Infinity Group (UK) Limited | Professional & scientific | 2011 |
| Infinity Investment Group Limited | Professional & scientific | 2024 |
| Infinity Medical Corporation (UK) Limited | Wholesale & retail | 2021 |
| Infinity Pixel Ltd | Wholesale & retail | 2024 |
| Infinity Rotary Performance Ltd | Manufacturing | 2020 |
| Inflect Advisory Limited | Professional & scientific | 2025 |
| Influential Management Limited | Professional & scientific | 2011 |
| Influential Partners Ltd | Professional & scientific | 2006 |
| Info by Design Ltd | Information & communication | 2012 |
| Infosynthia Ltd | Information & communication | 2025 |
| Infotech Business Solutions Ltd | Information & communication | 2023 |
| Infoverse Ltd | Information & communication | 2023 |
| Infused Vision Limited | Information & communication | 2011 |
| Inga KL Transport Ltd | Transport & logistics | 2019 |
| Ingenious Productions Limited | Information & communication | 2023 |
| Ingiliz Ltd | Wholesale & retail | 2022 |
| Inglewood 76 Limited | Wholesale & retail | 2025 |
| Inglis Contractors Ltd | Construction | 2025 |
| Inivos Limited | Manufacturing | 2010 |
| Inject Tuning Ltd | Wholesale & retail | 2024 |
| INK Glitter Studio Limited | Manufacturing | 2023 |
| INK Media Ltd | Professional & scientific | 2011 |
| INK Works Ltd | Manufacturing | 2023 |
| Ink-Prints LC Ltd | Wholesale & retail | 2023 |
| Inkwell Printing Ltd | Manufacturing | 2008 |
| Inmind Care Services Ltd | Manufacturing | 2011 |
| Inndigo Limited | Hospitality | 1999 |
| Inner Spark Development Limited | Other services | 2021 |
| Innerlink Limited | Real estate | 2009 |
| Innotec Products Limited | Wholesale & retail | 2013 |
| Innovate Fabrication Limited | Manufacturing | 2018 |
| Innovate Media Ltd | Information & communication | 2022 |
| Innovation Property Lettings Limited | Real estate | 2021 |
| Innovative Energy Solutions Limited | Administrative & support | 2011 |
| Innsworth Residents Company Limited | Households | 2001 |
| Inpower Community CIC | Education | 2025 |
| Insane Car Ltd | Wholesale & retail | 2021 |
| Insane Car Online Ltd | Wholesale & retail | 2023 |
| Inside OUT North London Limited | Health & social care | 2022 |
| Insight and Consultancy Ltd | Professional & scientific | 2019 |
| Insight Integrated Services Ltd | Real estate | 2022 |
| Insightica Creative Ltd | Professional & scientific | 2024 |
| Insignia Consultancy Solutions Limited | Information & communication | 2023 |
| Insite Energy Limited | Professional & scientific | 2009 |
| Insite Holdco Limited | Professional & scientific | 2014 |
| Inslatt Ltd | Education | 2026 |
| Inspiral Therapy Practice Limited | Health & social care | 2023 |
| Inspiration Sound and Light Limited | Wholesale & retail | 2013 |
| Inspirational Bar & Restaurants Management Ltd | Hospitality | 2018 |
| Inspirations Limited | Professional & scientific | 1993 |
| Inspire 2 Achieve Ltd | Administrative & support | 2018 |
| Inspire Dance & Performance Community Interest Company | Arts & recreation | 2023 |
| Inspire ME Training Ltd | Professional & scientific | 2011 |
| Inspire Medical Affairs Limited | Professional & scientific | 2023 |