| Italian Kemate Chemite Mining Co., Ltd | Wholesale & retail | 2023 |
| Italian Plantoo Marine Biotech Ltd | Mining & quarrying | 2025 |
| Italica Enterprise Ltd. | Financial services | 2011 |
| Italomix International Trading Limited | Wholesale & retail | 2023 |
| Italvera Ltd | Hospitality | 2025 |
| Italy Agar Chemical Co. Ltd | Mining & quarrying | 2025 |
| Italy Antym Chemical Ltd | Mining & quarrying | 2024 |
| Italy Aplite International Chemical Co., Ltd | Wholesale & retail | 2023 |
| Italy Dashani Horticultural Fertilizer Company Co., Ltd | Mining & quarrying | 2024 |
| Italy Florence Crop Science Co., Ltd | Extraterritorial | 2025 |
| Italy Giels (Europe) Chemical Group Co., Ltd | Mining & quarrying | 2024 |
| Italy Kendo Crop Nutrition S.P.A Ltd | Mining & quarrying | 2022 |
| Italy Nordin Biological Technology Co., Ltd | Wholesale & retail | 2023 |
| Italy Omusite Limited | Wholesale & retail | 2024 |
| Italy Padua International (Pdwgj) Fertilizer Group Co., Ltd | Extraterritorial | 2025 |
| Italy Paluosi Group Limited | Extraterritorial | 2024 |
| Italy Roca Nutrition Science Co., Ltd | Mining & quarrying | 2026 |
| Italy Romawotai International Chemical Group Co., Ltd | Mining & quarrying | 2025 |
| Italy Segfi Co., Ltd | Wholesale & retail | 2024 |
| Italy Segum Special Fertilizer Co., Ltd | Wholesale & retail | 2026 |
| Italy Talagro Chemical Co., Ltd | Mining & quarrying | 2024 |
| Italy Tecnobells.Rl Co., Ltd | Mining & quarrying | 2026 |
| Italy Turedi Chemical Co., Ltd | Wholesale & retail | 2024 |
| Italy YI EN Lang SEN Shares Co., Ltd | Extraterritorial | 2025 |
| Itcg Ltd | Administrative & support | 2024 |
| ITI Leadership Foundation | Financial services | 2020 |
| Itint Limited | Other services | 2013 |
| ITK Recruitment Limited | Administrative & support | 2009 |
| Itlong Limited | Information & communication | 2007 |
| ITM SWS Co., Limited | Wholesale & retail | 2025 |
| Itouch Limited | Information & communication | 2000 |
| Itransact Limited | Information & communication | 2001 |
| Itshifts Technologies Ltd | Information & communication | 2025 |
| Ittechlogy Ltd | Manufacturing | 2023 |
| Iucn UK | Professional & scientific | 2009 |
| Iulian Duta Ltd | Manufacturing | 2023 |
| Iulian Edge Ltd | Manufacturing | 2025 |
| Ivan Aero Ltd | Manufacturing | 2025 |
| Ivel Millpond Holdings Limited | Financial services | 2025 |
| Ivel Millpond Limited | Real estate | 2019 |
| Ivermee Aero Ltd | Manufacturing | 2017 |
| Ivestclub Ltd | Information & communication | 2024 |
| Ivett & Reed Limited | Administrative & support | 2018 |
| Ivida Smart Technologies Ltd | Wholesale & retail | 2024 |
| Ivik Co Ltd | Manufacturing | 2023 |
| Ivotech Limited | Professional & scientific | 2009 |
| IVY and Yuan Ltd | Information & communication | 2025 |
| Ivyone Ltd | Wholesale & retail | 2018 |
| IWA Trade Co., Ltd | Wholesale & retail | 2025 |
| Izilla Limited | Wholesale & retail | 2013 |
| IZZ Longevity Ltd | Professional & scientific | 2025 |
| Izzard Digital Limited | Professional & scientific | 2022 |
| Izzi Taxi Cambridge Limited | Transport & logistics | 2024 |
| I’M NOT Just a Tick in a Box Ltd | Health & social care | 2024 |
| J & a Airport Transport Service Ltd | Transport & logistics | 2024 |
| J & D Real Estate Ltd | Real estate | 2021 |
| J & J Drake Limited | Construction | 2014 |
| J & K Wilson (Building) Limited | Real estate | 2002 |
| J & N Contracts Cambs Ltd | Other services | 2021 |
| J a Health & Fitness Ltd | Arts & recreation | 2020 |
| J Anderson-Brown Services Limited | Professional & scientific | 2024 |
| J Beynon General Builders Ltd | Construction | 2019 |
| J Bowles Electrical Ltd | Construction | 2024 |
| J C W Enterprises Limited | Manufacturing | 1999 |
| J CAM Labs Limited | Information & communication | 2026 |
| J Clarke & Co Ltd | Financial services | 2022 |
| J Clarke TM Ltd | Construction | 2024 |
| J D Car & Commercial Bodycentre Limited | Manufacturing | 2008 |
| J D Cars Limited | Construction | 2015 |
| J D Hunter Farming Limited | Agriculture & fishing | 2020 |
| J D Searle Maintenance Ltd | Construction | 2022 |
| J D Searle Motor Engineers Limited | Wholesale & retail | 2015 |
| J Farrell Consulting Limited | Other services | 2026 |
| J FOX Contracting Ltd | Manufacturing | 2017 |
| J Green Properties Limited | Construction | 1968 |
| J H Barker & Associates Ltd | Professional & scientific | 2025 |
| J J Consultants Ltd | Professional & scientific | 2023 |
| J Kilborn & SON Ltd | Construction | 2014 |
| J L Cambridge Soft Furnishings Limited | Wholesale & retail | 2011 |
| J M Carpentry Limited | Construction | 2003 |
| J M Electrical Limited | Construction | 2006 |
| J M Fret Limited | Other services | 2022 |
| J M Structural Consultants Limited | Professional & scientific | 2016 |
| J Merrigan Production Services Limited | Administrative & support | 2012 |
| J O S Residential Services Ltd | Real estate | 2024 |
| J P Webster Construction Limited | Construction | 2003 |
| J Pepper Plasterwork Ltd | Construction | 2016 |
| J R J Contractors Limited | Construction | 2026 |
| J S Driveways & Patios Ltd | Administrative & support | 2025 |
| J V Property Ltd | Real estate | 2015 |
| J&C Industry Corporation Limited | Professional & scientific | 2004 |
| J&H Composites Ltd | Manufacturing | 2022 |
| J&H Special Paints Co., Ltd | Extraterritorial | 2018 |
| J&H Tech Ltd | Professional & scientific | 2025 |
| J&J Aircraft Ltd | Manufacturing | 2016 |
| J&J Caring Services Limited | Administrative & support | 2018 |
| J&M Empire Ltd | Real estate | 2025 |
| J'Makin ME Ltd | Manufacturing | 2022 |
| J. Cummin Limited | Extraterritorial | 1996 |
| J.A. Aeroworks Ltd | Manufacturing | 2025 |