| Imlm Services Limited | Administrative & support | 2019 |
| Immaculate Floor Screeding UK Ltd | Construction | 2025 |
| Immersive Sound and Vision Limited | Other services | 2016 |
| Immunity Ltd | Information & communication | 2019 |
| IMN Group Ltd | Real estate | 2026 |
| Imobiletech Limited | Wholesale & retail | 2012 |
| Imogen IS the Best Ltd | Health & social care | 2024 |
| Impact Bidco Limited | Professional & scientific | 2024 |
| Impact Dental & Implant Laboratory Limited | Health & social care | 2005 |
| Impact EDU Ltd | Information & communication | 2021 |
| Impact Insurance Services (Bolton) Limited | Financial services | 2003 |
| Impact Kitchens & Bedrooms Limited | Construction | 2004 |
| Impact Landscape & Construction Ltd | Construction | 2022 |
| Impact Makers Hub CIC | Education | 2026 |
| Impact Midco 1 Limited | Extraterritorial | 2019 |
| Impact Midco 2 Limited | Extraterritorial | 2024 |
| Impact Rose Ltd | Administrative & support | 2023 |
| Impact Topco Limited | Extraterritorial | 2019 |
| IMPACT47 Ltd | Professional & scientific | 2022 |
| Impel II Ltd | Real estate | 2020 |
| Impel III Ltd | Real estate | 2017 |
| Imperative Solutions Limited | Administrative & support | 2014 |
| Imperial Car Services UK 1 Ltd | Wholesale & retail | 2022 |
| Imperial Estates NW Ltd | Real estate | 2024 |
| Imperial Forecourts NW Ltd | Wholesale & retail | 2023 |
| Imperial Personalisation Limited | Wholesale & retail | 2021 |
| Imperial Plumbing and Heating Solutions Ltd | Construction | 2016 |
| Imperial Properties & Rentals Ltd | Real estate | 2021 |
| Imperial Properties and Development Ltd | Construction | 2024 |
| Imperial Services NW Ltd | Health & social care | 2014 |
| Imporva Limited | Construction | 2025 |
| Impossible AI Ltd | Wholesale & retail | 2025 |
| Impossible Ideas Ltd | Information & communication | 2011 |
| Impression (Bolton) Holdings Limited | Financial services | 2018 |
| Impression (Bolton) Limited | Administrative & support | 2009 |
| Impression Property Management Limited | Real estate | 2018 |
| Impressions Homeware Ltd | Wholesale & retail | 2022 |
| Impulse Service Limited | Other services | 2014 |
| Imran Chohan Ltd | Professional & scientific | 2022 |
| Imran Commerce Limited | Wholesale & retail | 2023 |
| Imran MAN & Van Limited | Transport & logistics | 2024 |
| Imrd Legal Ltd | Professional & scientific | 2019 |
| IMS Construction & Groundwork Limited | Construction | 2009 |
| IMS Plant Limited | Construction | 2018 |
| Imshi Tech Ltd | Wholesale & retail | 2023 |
| IMT Cars Limited | Wholesale & retail | 2025 |
| IMT Consultants Limited | Professional & scientific | 2017 |
| IMT Financial Limited | Financial services | 2018 |
| IN Control Consulting Limited | Health & social care | 2003 |
| IN Eliquids Ltd | Wholesale & retail | 2017 |
| In-Depth Spa Solutions Ltd | Other services | 2021 |
| In-House York Ltd | Administrative & support | 2023 |
| IN1 Global Fulfilment Ltd | Transport & logistics | 2024 |
| IN4TECH Ltd | Information & communication | 2019 |
| INA22 Holdings Ltd | Financial services | 2025 |
| Inaaya Enterprise Ltd | Wholesale & retail | 2024 |
| Inaayah Properties Ltd | Real estate | 2024 |
| Inavate Blackburn Ltd | Wholesale & retail | 2023 |
| Inaya Collective Ltd | Professional & scientific | 2026 |
| Inaya Transport Limited | Wholesale & retail | 2024 |
| Inbiz Consultation and Technologies Ltd | Wholesale & retail | 2022 |
| Inbox Influenced Ltd | Professional & scientific | 2024 |
| Inc Care Ltd | Health & social care | 2023 |
| Ince Contractors Limited | Construction | 2019 |
| Ince Moss Estates Limited | Financial services | 2012 |
| Ince Moss Properties Limited | Construction | 2024 |
| Ince Property Management Ltd | Real estate | 2002 |
| Inception Outreach Ltd | Administrative & support | 2023 |
| Inchargeo Limited | Information & communication | 2020 |
| Inclusive Chai Ltd | Information & communication | 2025 |
| Inclusive Healthcare Services Limited | Administrative & support | 2024 |
| Inclusive Learning North Ltd. | Education | 2014 |
| Incontinence UK Limited | Wholesale & retail | 2011 |
| Incredible Artists Limited | Arts & recreation | 2000 |
| Incredible Productions Limited | Arts & recreation | 2011 |
| Incredisoft Limited | Information & communication | 2022 |
| Indeed Services Limited | Real estate | 2023 |
| Independent Advice Ltd | Financial services | 2008 |
| Independent Connections Limited | Financial services | 2009 |
| Independent Dapp Services Ltd | Other services | 2026 |
| Independent Energy Managers Limited | Professional & scientific | 2023 |
| Independent Environmental Safety Services Limited | Administrative & support | 2015 |
| Independent Foster Care Services Limited | Health & social care | 2003 |
| Independent Living Centre Ltd | Construction | 2019 |
| Independent Merchant Services Limited | Administrative & support | 2012 |
| Independent Passenger Services Limited | Transport & logistics | 2013 |
| Independent Social Work Solutions Ltd | Health & social care | 2023 |
| Indevor Estates Limited | Financial services | 2020 |
| Indevor Infra Estates Limited | Construction | 2022 |
| Indevor Land Limited | Administrative & support | 2020 |
| Indevor Water Limited | Construction | 2022 |
| Index Joinery Ltd | Construction | 2024 |
| Indian 109A Ltd | Hospitality | 2018 |
| Indian Cottage Limited | Hospitality | 1998 |
| Indiankaraoke Limited | Arts & recreation | 2007 |
| Indie Scaffolding Ltd | Construction | 2026 |
| Indie's Attic Ltd | Wholesale & retail | 2020 |
| Indieboost.Digital Ltd | Professional & scientific | 2024 |
| Indigo Arts Inc Ltd | Information & communication | 2024 |
| Indigo Corporate Ltd | Wholesale & retail | 2023 |