| Invertical Ltd | Information & communication | 2024 |
| Invest Europe Limited | Real estate | 2012 |
| Investment International Limited | Real estate | 2019 |
| Investo Properties Limited | Real estate | 2018 |
| Invicta Angling Limited | Wholesale & retail | 2002 |
| Invicta Bathrooms Ltd | Construction | 2025 |
| Invicta Construction Consultancy Limited | Professional & scientific | 2022 |
| Invicta Foods Limited | Wholesale & retail | 1991 |
| Invicta Karate Limited | Arts & recreation | 2021 |
| Invicta Kent Management Limited | Real estate | 2025 |
| Invicta Martlet Limited | Administrative & support | 2012 |
| Invicta Properties Limited | Real estate | 2012 |
| Invicta Property Developments Ltd | Real estate | 2025 |
| Invicta Rail Ltd | Construction | 2020 |
| Invicta Transport Training & Consulting Ltd | Information & communication | 2026 |
| Invictus Systems Ltd | Construction | 2005 |
| Invicus Services Limited | Real estate | 2017 |
| Invisible Dogs, ETC Ltd | Information & communication | 2023 |
| Invvu Construction Consultants Ltd | Professional & scientific | 2017 |
| Invvu Ltd | Extraterritorial | 2017 |
| Ionapos Ltd | Construction | 2016 |
| Ionline Internet Solutions Provider Ltd | Information & communication | 2017 |
| Iotc Real Asset Ltd | Other services | 2026 |
| Ip-Tek UK Ltd | Administrative & support | 2021 |
| Iqra Consultants (PVT) Limited | Other services | 2012 |
| Iqra Housing Limited | Real estate | 2019 |
| Irata International | Other services | 1997 |
| Ireland & Ireland Property Limited | Real estate | 2023 |
| Irene Ltd | Health & social care | 2005 |
| Irise Consulting Limited | Wholesale & retail | 2024 |
| Irish Giant Developments Limited | Construction | 2024 |
| Irish Giant Group Limited | Real estate | 2019 |
| Iron Tree Metal Works Limited | Manufacturing | 2020 |
| Irvin Brothers Limited | Wholesale & retail | 2020 |
| Irvins Amusements Limited | Arts & recreation | 2005 |
| Isaiah 6022 Limited | Health & social care | 2023 |
| Isla Baleares Construction Limited | Construction | 2023 |
| Island Lake France Limited | Agriculture & fishing | 2019 |
| Island Wall Limited | Construction | 2002 |
| Isle of Thanet Investments Limited | Real estate | 1996 |
| Isonav Ltd | Professional & scientific | 2017 |
| Istb Ltd | Information & communication | 2010 |
| Iswuk Ltd | Construction | 2016 |
| IT Consulting and Services Ltd | Information & communication | 2017 |
| IT Renovations Ltd | Construction | 2026 |
| IT Sales Limited | Administrative & support | 2008 |
| Itap Solutions Limited | Information & communication | 2004 |
| Items Direct Limited | Wholesale & retail | 2013 |
| Itot Networks Ltd | Information & communication | 2024 |
| ITS a Good Life CIC | Health & social care | 2025 |
| ITS Your Box Ltd | Manufacturing | 2024 |
| Itsm Consulting Limited | Information & communication | 2010 |
| ITT Energy Ltd | Extraterritorial | 2020 |
| ITT Speedy Limited | Transport & logistics | 2017 |
| It’S Morish Ltd | Manufacturing | 2026 |
| Ivan F Limited | Real estate | 2024 |
| Ivanov 13 Ltd | Transport & logistics | 2019 |
| Ivar IT Solutions Ltd | Information & communication | 2022 |
| IVC Signs Limited | Manufacturing | 2007 |
| Ivinco Group Ltd | Financial services | 2023 |
| Ivo's Garage Ltd | Wholesale & retail | 2017 |
| Ivory and Zari Limited | Wholesale & retail | 2025 |
| Ivory Plethora Ltd | Administrative & support | 2025 |
| IVY & Coleman UK Ltd | Professional & scientific | 2013 |
| IVY & SON Ltd | Administrative & support | 2019 |
| IVY Consult Ltd | Administrative & support | 2026 |
| IVY Grace Hair Limited | Other services | 2022 |
| Izone Ltd | Wholesale & retail | 1998 |
| Izzy Garden Services Ltd | Professional & scientific | 2023 |
| J & T Electrical Contractors Ltd | Construction | 2026 |
| J a Ellis Plant Engineers Ltd | Professional & scientific | 2019 |
| J and E Brown Cars Ltd | Transport & logistics | 2023 |
| J and J Global Limited | Information & communication | 2018 |
| J Boisnier Ltd | Real estate | 2005 |
| J Botting Installations Ltd | Construction | 2014 |
| J Burgoyne Ltd | Construction | 2014 |
| J C & S K Williams Ltd | Agriculture & fishing | 2020 |
| J C M Music Limited | Information & communication | 2006 |
| J Creasey Ltd | Transport & logistics | 2022 |
| J D Bakery Sandwich Bar Limited | Hospitality | 2012 |
| J D Drivestyle Limited | Construction | 2015 |
| J D Freight Limited | Other services | 1994 |
| J D Heating & GAS Specialist Limited | Construction | 2013 |
| J Dellar Limited | Wholesale & retail | 2005 |
| J E Developments Limited | Construction | 2017 |
| J E Lettings Limited | Real estate | 2016 |
| J Farrance Construction Limited | Construction | 2016 |
| J Gree Ltd | Health & social care | 2019 |
| J H Hygiene Ltd | Health & social care | 2022 |
| J Hutchision Construction UK Ltd | Construction | 2014 |
| J K Design & Draughting Services Limited | Professional & scientific | 2012 |
| J Larkin Transport Ltd | Transport & logistics | 2009 |
| J Levett Ltd | Health & social care | 2026 |
| J Lilley Limited | Agriculture & fishing | 2023 |
| J Lucy Electrical Limited | Construction | 2026 |
| J M E Solar & Roofing Ltd | Construction | 2024 |
| J M Interiors (UK) Limited | Manufacturing | 2014 |
| J M Posner Limited | Wholesale & retail | 2009 |
| J N Gardening Limited | Administrative & support | 2010 |
| J O S Projects Ltd | Construction | 2024 |