| Inveni Viam Ltd | Wholesale & retail | 2022 |
| Invenire Estates Ltd | Real estate | 2025 |
| Invent Recycling Ltd | Manufacturing | 2021 |
| Inventa IT Solutions Ltd | Information & communication | 2019 |
| Inventiq Ltd | Information & communication | 2026 |
| Inventive Care Services Ltd | Health & social care | 2023 |
| Inventive Holdings Limited | Financial services | 2023 |
| Inventory on the Move Limited | Other services | 2019 |
| Inventto Ltd | Wholesale & retail | 2024 |
| Invergold Associates Ltd | Transport & logistics | 2013 |
| Invergold Compliance Ltd | Professional & scientific | 2018 |
| Invergold Ltd | Professional & scientific | 2020 |
| Invergold Property & Investment Limited | Real estate | 2020 |
| Invest 230 Ltd | Real estate | 2025 |
| Invest 3 Ltd | Financial services | 2023 |
| Invest 91 Ltd | Real estate | 2023 |
| Invest Co 1 AB Limited | Financial services | 2024 |
| Invest Co 1 Investments Limited | Financial services | 2020 |
| Invest Co 1 JB Limited | Financial services | 2024 |
| Invest Co 1 Limited | Financial services | 2014 |
| Invest Co 1 Rbeq Limited | Financial services | 2024 |
| Invest Co 1 RBEQ2 Limited | Financial services | 2025 |
| Invest Co 1 SB Limited | Financial services | 2024 |
| Invest Co Four Limited | Real estate | 2025 |
| Invest Co Sandycroft Limited | Financial services | 2026 |
| Invest Co Two Limited | Real estate | 2025 |
| Invest Commercial Finance Ltd | Financial services | 2024 |
| Invest Estate Group Ltd | Real estate | 2024 |
| Invest Homes Limited | Real estate | 2025 |
| Invest in the UK People Ltd | Administrative & support | 2023 |
| Invest Nest (AH) Ltd | Financial services | 2025 |
| Invest Property Holdings Ltd | Real estate | 2016 |
| Invest Residential & BTL Mortgages Ltd | Financial services | 2024 |
| Investa Hub Finances Ltd | Financial services | 2020 |
| Investabroad Properties Limited | Real estate | 2001 |
| Investafrica Media Limited | Information & communication | 2019 |
| Investas Properties Ltd | Real estate | 2022 |
| Investation Ltd | Wholesale & retail | 2023 |
| Investchlo Limited | Real estate | 2023 |
| Investec Estates Ltd | Real estate | 2024 |
| Investgo Ltd | Wholesale & retail | 2018 |
| Investing BG Limited | Financial services | 2024 |
| Investment and Assets Property Ltd | Real estate | 2026 |
| Investment Company 24 Bidco Limited | Professional & scientific | 2022 |
| Investment Eight Limited | Real estate | 2024 |
| Investment Habitat Limited | Financial services | 2025 |
| Investment Innovators Limited | Professional & scientific | 2023 |
| Investment Performance Optimisation Limited | Information & communication | 2024 |
| Investment Properties Group Ltd | Real estate | 2025 |
| Investment Properties Holding Limited | Real estate | 2022 |
| Investment Property Partners Limited | Real estate | 2015 |
| Investmental Advisory Ltd | Construction | 2019 |
| Investor Zone Ltd | Real estate | 2024 |
| Investors in Real Estate Limited | Real estate | 2017 |
| Investpoint Ltd | Real estate | 2013 |
| Investza LLP | | 2016 |
| Invi Logistics T/A UWL Birmingham Ltd | Transport & logistics | 2020 |
| Invicta Hydrogen Systems Limited | Energy | 2017 |
| Invicta Security Services Ltd | Administrative & support | 2023 |
| Invictus Holdings Group Ltd | Real estate | 2023 |
| Invictus SA Holdings Limited | Professional & scientific | 2016 |
| Invictus Wolf Consultancy Ltd | Administrative & support | 2017 |
| Invigour Limited | Construction | 2000 |
| Invincible International Limited | Real estate | 2020 |
| Inviost Ltd | Wholesale & retail | 2024 |
| Inviron Property Limited | Real estate | 2009 |
| Inviso Enterprises UK Limited | Professional & scientific | 2013 |
| Invoke Design Ltd | Wholesale & retail | 2023 |
| Invoplex Limited | Wholesale & retail | 2018 |
| Invst Capital Ltd | Real estate | 2021 |
| Invst Holdings Ltd | Real estate | 2021 |
| Invst Property Ltd | Real estate | 2018 |
| Inward Foods Ltd | Manufacturing | 2020 |
| Inward Parenting CIC | Health & social care | 2023 |
| Inyseby Services Ltd | Construction | 2025 |
| Inzo UK Limited | Real estate | 2025 |
| Ioan C Ltd | Construction | 2025 |
| Ioana Jianu Ltd | Wholesale & retail | 2019 |
| IOC Anabtawi UK Ltd | Wholesale & retail | 2021 |
| IOM Trading Ltd | Wholesale & retail | 2023 |
| ION MAN Limited | Administrative & support | 2016 |
| ION Transport Handlers Limited | Transport & logistics | 2020 |
| Ioncodex Ltd | Information & communication | 2025 |
| Ionconstantin Ltd | Administrative & support | 2019 |
| Ionic Market Insight Limited | Administrative & support | 2024 |
| Ionic Metal Treatments Limited | Manufacturing | 2007 |
| Ionic Technology Ltd | Manufacturing | 2023 |
| Ionq Quantum UK Limited | Information & communication | 2024 |
| Ionutmutis Transport Limited | Transport & logistics | 2024 |
| Ionutplesca Ltd | Administrative & support | 2020 |
| Ionx Networks Limited | Information & communication | 2016 |
| Ioor Projects Ltd | Construction | 2016 |
| Iornpulse Limited | Wholesale & retail | 2025 |
| Iosif EEL Ltd | Professional & scientific | 2022 |
| Iosua Iamandi Ltd | Wholesale & retail | 2025 |
| IOT Tech Solutions Limited | Information & communication | 2021 |
| Iotic Labs Limited | Information & communication | 2014 |
| Iovis Business Advice Ltd | Professional & scientific | 2020 |
| IP Concepts International Limited | Professional & scientific | 2023 |
| IP Fires Ltd | Wholesale & retail | 2024 |