| ITB Pension Trustees (2) Limited | Professional & scientific | 2010 |
| ITC Global Security Investments Limited | Professional & scientific | 2018 |
| ITC Global Security Limited | Information & communication | 1995 |
| Itchhiker Limited | Manufacturing | 2025 |
| Itec Connect Ltd | Information & communication | 1988 |
| Itech Networks Ltd | Information & communication | 2006 |
| Itechsync Limited | Wholesale & retail | 2025 |
| Itel Secure Limited | Information & communication | 2017 |
| Iteratively Ltd | Information & communication | 2017 |
| Itfin Limited | Information & communication | 2004 |
| ITG Brands Limited | Financial services | 1989 |
| Ithaca Cyber Security Limited | Information & communication | 2025 |
| Ithaca Product Consultancy Ltd | Information & communication | 2026 |
| Ithier Financial Advice Limited | Financial services | 2021 |
| Ithq Holdings Ltd | Professional & scientific | 2008 |
| Ithq Ltd | Information & communication | 2019 |
| ITM Property Ltd | Real estate | 2025 |
| Itoma Architects Limited | Professional & scientific | 2026 |
| ITP Advisory Group Limited | Administrative & support | 2020 |
| ITP Two One Seven Ltd | Other services | 2019 |
| Itpe Ltd | Professional & scientific | 2014 |
| ITQ Digital Limited | Information & communication | 2019 |
| Itreva Limited | Information & communication | 2009 |
| ITS About Music Roadshow Limited | Arts & recreation | 2023 |
| ITS Contracts Limited | Professional & scientific | 2024 |
| ITS Property Management Ltd | Administrative & support | 2020 |
| ITS Purely Financial Limited | Professional & scientific | 2011 |
| ITS Worth the Wait Limited | Manufacturing | 2026 |
| Itsettled Limited | Administrative & support | 2019 |
| Ittransconsult Limited | Information & communication | 2018 |
| ITZ Nutz Ltd | Manufacturing | 2020 |
| Iuna Limited | Health & social care | 2019 |
| Iunblock Ltd | Extraterritorial | 2020 |
| IV Drip Fit Ltd | Health & social care | 2023 |
| Iva's Loft Ltd | Information & communication | 2023 |
| Ivan Elite Drylining Ltd | Construction | 2025 |
| Ivan Ssempa Limited | Health & social care | 2015 |
| Ivann Transport Limited | Transport & logistics | 2020 |
| IVC (TB) Limited | Professional & scientific | 2017 |
| IVC Acquisition Ltd | Financial services | 2016 |
| IVC Acquisition Midco Ltd | Financial services | 2016 |
| IVC Acquisition Pikco Ltd | Financial services | 2016 |
| IVC CAD Finance Limited | Information & communication | 2022 |
| IVC Dormant Limited | Extraterritorial | 2025 |
| Iverson Consulting Limited | Administrative & support | 2010 |
| Ives Properties Limited | Real estate | 2022 |
| Ivey League Housing Ltd | Real estate | 2026 |
| Ivey League Taxis Services Ltd | Transport & logistics | 2025 |
| Ivory Healthcare and Medical Bristol Limited | Health & social care | 2024 |
| Ivory Hill Management Company Limited | Households | 2023 |
| Ivsr Limited | Extraterritorial | 2016 |
| IVV Logistic Ltd | Transport & logistics | 2021 |
| IVY Arts Productions Limited | Arts & recreation | 2011 |
| IVY Farm Oldbury Ltd | Agriculture & fishing | 2026 |
| IVY Jacob Property Limited | Real estate | 2024 |
| IVY Lodge Court Limited | Real estate | 1987 |
| Ivymax 1 Ltd | Hospitality | 2020 |
| Ivyrose Property Investments Ltd | Real estate | 2021 |
| Ivyvyan Ltd | Real estate | 2023 |
| Ivywell Capital Limited | Construction | 2015 |
| Ivywell Interiors Ltd | Professional & scientific | 2020 |
| Ivywood Construction Limited | Construction | 2013 |
| Ivywood Contractors Limited | Construction | 2019 |
| Iwebstudio-Tech Limited | Information & communication | 2022 |
| Iwood YEO Properties Limited | Real estate | 2013 |
| IWS Design Limited | Professional & scientific | 2014 |
| Ixsam Limited | Professional & scientific | 2020 |
| Iyen Dynasty Limited | Health & social care | 2025 |
| Iyengars Bakery Ltd | Hospitality | 2026 |
| Iyok Care Ltd | Administrative & support | 2021 |
| Izabela Szymula-Skiba Limited | Extraterritorial | 2024 |
| Izakaya Japanese Ltd | Hospitality | 2022 |
| Izeo Construction Ltd | Construction | 2017 |
| Izit Group Limited | Professional & scientific | 2009 |
| Izmi Capital Limited | Financial services | 2023 |
| IZO Group Ltd | Financial services | 2024 |
| Izzugo Consulting Limited | Professional & scientific | 2024 |
| Izzy Evans Ltd | Information & communication | 2026 |
| J & a Tharakans Limited | Real estate | 2023 |
| J & B Systems Limited | Information & communication | 2024 |
| J & C Properties (Bristol) Limited | Other services | 2019 |
| J & C Stinton Limited | Other services | 2010 |
| J & D Electrical (Bristol) Limited | Wholesale & retail | 2000 |
| J & D Masonry Ltd | Construction | 2017 |
| J & D Mcquaid Ceramic Tiling Limited | Construction | 2007 |
| J & D Property Holdings Limited | Real estate | 2022 |
| J & DP Limited | Construction | 2016 |
| J & G Fencing Limited | Construction | 2002 |
| J & J Property Services (Bristol) Ltd | Households | 2023 |
| J & J Roadstars UK Ltd | Transport & logistics | 2019 |
| J & K Restaurant Ltd | Hospitality | 2023 |
| J & K Surveying Limited | Professional & scientific | 2016 |
| J & R Decorators Ltd | Construction | 2007 |
| J & S Catering Limited | Hospitality | 2016 |
| J & T 126 Limited | Extraterritorial | 2015 |
| J & V Properties Ltd | Real estate | 2017 |
| J a (Harrogate) Ltd | Hospitality | 2013 |
| J a Aviation Limited | Transport & logistics | 2018 |
| J a B Services UK Ltd | Extraterritorial | 2006 |
| J a Developments Limited | Construction | 2006 |