| Indigo Lash Artistry Ltd | Other services | 2018 |
| Indigo Wolf Plumbing & Heating Ltd | Construction | 2024 |
| Individualsmcr Limited | Wholesale & retail | 2024 |
| INDUSTR1AL Limited | Real estate | 2022 |
| Industri Eyewear Ltd | Wholesale & retail | 2026 |
| Industrial & Domestic Shutters UK Ltd | Construction | 2019 |
| Industrial Dataops Limited | Professional & scientific | 2024 |
| Industrial Material Supply Centre Ltd | Manufacturing | 2018 |
| Industrial Shutter Door Services Ltd | Manufacturing | 2007 |
| Industrial Shutter Doors UK Limited | Manufacturing | 2024 |
| Industrial Spray Solutions Limited | Administrative & support | 2009 |
| Indv Limited | Professional & scientific | 2025 |
| Indy Motors Limited | Wholesale & retail | 2021 |
| Indya Health Ltd | Extraterritorial | 2024 |
| Inelso Limited | Education | 2018 |
| Inen Ltd | Professional & scientific | 2025 |
| Inergy Properties Limited | Real estate | 2023 |
| Ines Novoa Fitness Ltd | Arts & recreation | 2023 |
| Inesta Ltd | Professional & scientific | 2026 |
| Inetpub Ltd | Information & communication | 2016 |
| INF Media Ltd | Information & communication | 2025 |
| Infamous Ltd | Information & communication | 2022 |
| Infcl Ltd | Professional & scientific | 2025 |
| Inffinite Enterprise Ltd. | Wholesale & retail | 2018 |
| Infini-Tech Computing Ltd | Information & communication | 2019 |
| Infinite Car Leasing Ltd | Administrative & support | 2021 |
| Infinite EV Ltd | Construction | 2022 |
| Infinite Investments Ltd | Real estate | 2023 |
| Infinite Merchandise Limited | Wholesale & retail | 2021 |
| Infinite Properties (2021) Ltd | Real estate | 2021 |
| Infinite Property Development Limited | Real estate | 2023 |
| Infinite Technology Services Ltd | Construction | 2025 |
| Infinite Technology Solutions Ltd | Education | 2022 |
| Infinite Training Solutions Limited | Education | 2015 |
| Infinitisync Ltd | Information & communication | 2023 |
| Infinitive Hygiene Limited | Administrative & support | 2019 |
| Infinity Airport Transfer Limited | Transport & logistics | 2023 |
| Infinity Comms Ltd | Information & communication | 2025 |
| Infinity Construction Commercial and Retail Interiors Limited | Construction | 2013 |
| Infinity Construction North East Limited | Construction | 2019 |
| Infinity Creates Ltd | Professional & scientific | 2026 |
| Infinity Fitness Bolton Ltd | Arts & recreation | 2018 |
| Infinity Life Limited | Real estate | 2007 |
| Infinity Marketing Limited | Professional & scientific | 2025 |
| Infinity Plumbing & Maintenance SW Ltd | Construction | 2025 |
| Infinity Tax Solutions Ltd | Professional & scientific | 2025 |
| Infinity Ventures Group Ltd | Real estate | 2024 |
| Inflexpoint Ltd | Professional & scientific | 2025 |
| Influence Sphere Limited | Wholesale & retail | 2024 |
| Influentric Limited | Information & communication | 2018 |
| Info Pulse Solutions Ltd | Information & communication | 2026 |
| Infoo Limited | Information & communication | 2019 |
| Information and Data Networks Supplies Holdings Limited | Professional & scientific | 1997 |
| Information and Data Networks Supplies Limited | Information & communication | 1988 |
| Information Services Solutions Limited | Information & communication | 2015 |
| Informative Media UK Ltd | Other services | 2016 |
| Infosec OP Ltd | Information & communication | 2025 |
| Infrared Heating Panels Limited | Manufacturing | 2016 |
| Infrasec Ltd | Information & communication | 2023 |
| Infraspell Ltd | Information & communication | 2026 |
| Ingar Investments Ltd | Real estate | 2025 |
| Ingenium Software Engineering Limited | Information & communication | 2021 |
| Ingenuity Incorporated Ltd | Wholesale & retail | 2014 |
| Inglenook Court Limited | Households | 2002 |
| Ingrex Ltd | Professional & scientific | 2026 |
| Inhabit Lettings & Property Management Ltd | Real estate | 2012 |
| Inhabit Properties NW Ltd | Real estate | 2025 |
| Inispa Holdings Limited | Financial services | 2023 |
| Initialise Commerce Limited | Information & communication | 2025 |
| Initium Technical Services Ltd | Administrative & support | 2018 |
| Inizio @French Press Limited | Hospitality | 2025 |
| Inject IT Limited | Information & communication | 2010 |
| Injectox Clinic Ltd | Other services | 2025 |
| Injn Limited | Other services | 2025 |
| Injury Claim Reports Limited | Health & social care | 2020 |
| Injury Mechanics Limited | Health & social care | 2012 |
| INK & Ivory Limited | Professional & scientific | 2025 |
| INK Car Sales Ltd | Wholesale & retail | 2022 |
| INK Rags Ltd | Wholesale & retail | 2017 |
| Inked Impressions Ltd | Wholesale & retail | 2025 |
| Inked Promo Ltd | Other services | 2024 |
| Inktoad Ltd | Wholesale & retail | 2019 |
| Inline Travel Ltd | Transport & logistics | 2023 |
| Inn for a Penny Limited | Hospitality | 2021 |
| Inner Logic Limited | Information & communication | 2015 |
| Inner Strength Therapy Ltd | Health & social care | 2025 |
| Innerflow UK Limited | Professional & scientific | 2004 |
| Innes & Sons Limited | Transport & logistics | 2023 |
| Innes Wilsden Financial Services Ltd | Professional & scientific | 2023 |
| Innocent World Limited | Wholesale & retail | 2025 |
| Innoscripta UK Limited | Professional & scientific | 2023 |
| Innov@Tive Facilities Ltd | Wholesale & retail | 2014 |
| Innova Marketing Ltd | Professional & scientific | 2024 |
| Innovate and Create Consultancy Ltd | Professional & scientific | 2018 |
| Innovate ERP Consulting Ltd | Information & communication | 2022 |
| Innovational Insights Ltd | Information & communication | 2019 |
| Innovative AD Strategies Ltd | Professional & scientific | 2024 |
| Innovative Education Ltd | Wholesale & retail | 2018 |
| Innovative Empire Ltd | Real estate | 2022 |
| Innovative Paul Solutions. Ltd | Construction | 2025 |