| International Christian Embassy Jerusalem (United Kingdom) Limited | Other services | 2008 |
| International Leisure Services (ILS) Ltd | Arts & recreation | 2024 |
| International Leisure Solutions Ltd | Arts & recreation | 2020 |
| Intertherm Ltd | Construction | 2014 |
| Intervention Academy Ltd | Education | 2024 |
| Intervention Academy Tutoring Ltd | Education | 2025 |
| Intl Sunset Ltd | Administrative & support | 2017 |
| Intrinsic Analysis Limited | Professional & scientific | 2008 |
| Intuition Holistic Therapies Ltd | Other services | 2023 |
| Invest (NW) Limited | Real estate | 2014 |
| Invest Protect Insure Financial Advice Ltd | Financial services | 2011 |
| Investimmo Construction Limited | Construction | 2020 |
| Investimmo Consulting Limited | Real estate | 2017 |
| Investimmo Group Limited | Real estate | 2017 |
| Invigour Total Wellbeing Ltd | Other services | 2014 |
| Inward Properties Ltd. | Real estate | 2002 |
| Inwestap Ltd | Transport & logistics | 2020 |
| Inyo Taeguek Martial Arts CIC | Arts & recreation | 2024 |
| Ioffer Ltd | Wholesale & retail | 2025 |
| ION Berceni Limited | Transport & logistics | 2022 |
| ION Guta Ltd | Transport & logistics | 2022 |
| IOS Motorbikes Ltd | Wholesale & retail | 2019 |
| Ipax Limited | Manufacturing | 2014 |
| IPD Business Ltd | Administrative & support | 2014 |
| IPM Light Haulage Ltd | Transport & logistics | 2026 |
| IPS Installations Ltd | Construction | 2025 |
| Irilon | Professional & scientific | 2026 |
| Iris Removal Limited | Transport & logistics | 2024 |
| Ironforged Games Ltd | Wholesale & retail | 2024 |
| Ironknight Financial Ltd | Real estate | 2025 |
| IRS Securhaul Ltd | Administrative & support | 2025 |
| Isabella Loves Ltd | Wholesale & retail | 2018 |
| Isamast | Professional & scientific | 2026 |
| ISC Industrial Services Limited | Construction | 2014 |
| Iscn Health Limited | Other services | 2020 |
| Isleo Investments Limited | Real estate | 2025 |
| Islington Property Investment & Management Ltd | Real estate | 2024 |
| ISM WP Holdings Limited | Real estate | 2025 |
| Isopyre Limited | Information & communication | 2007 |
| ISW Assessor Ltd | Professional & scientific | 2025 |
| IT 2020 Ltd | Real estate | 2020 |
| IT DEV Recruitment Limited | Administrative & support | 2016 |
| Itech Electrical Contracting Limited | Construction | 1996 |
| Itemad Company Limited | Manufacturing | 2026 |
| ITS Cheaper Than the Shops Limited | Wholesale & retail | 2023 |
| Itsmbeauty Limited | Wholesale & retail | 2025 |
| IV Contracts Ltd | Construction | 2019 |
| Ivendor Ltd | Wholesale & retail | 2020 |
| Ivii Limited | Information & communication | 2018 |
| Ivoria Ltd | Professional & scientific | 2026 |
| Ivory Key Realty Ltd | Real estate | 2025 |
| IVY Engineering/Fabrication Ltd | Professional & scientific | 2018 |
| IW Safety Ltd | Professional & scientific | 2026 |
| Izoba Ltd | Administrative & support | 2026 |
| J & D Maiden Ltd | Other services | 2018 |
| J & IP Consulting Ltd | Professional & scientific | 2016 |
| J & J Barbers Ltd | Other services | 2017 |
| J & M Plant Hire Limited | Administrative & support | 2018 |
| J & N Mckenna Ltd | Construction | 2012 |
| J & N OFF Licence Limited | Wholesale & retail | 2010 |
| J & P Moorcroft Ltd | Construction | 2003 |
| J a Prescott Group Limited | Administrative & support | 2022 |
| J Barton Therapy Limited | Health & social care | 2025 |
| J Bury Plumbing & Heating Ltd | Construction | 2020 |
| J D Kent Limited | Construction | 2008 |
| J Donaldson Ltd | Administrative & support | 2025 |
| J Duxbury Joinery Ltd | Construction | 2014 |
| J E Care Service Limited | Health & social care | 2020 |
| J E Nails & Spa Ltd | Other services | 2019 |
| J F Electrical (NW) Ltd | Construction | 2022 |
| J Frodsham Properties Limited | Real estate | 2024 |
| J Gadd Roofing Ltd | Construction | 2024 |
| J Gray Ltd | Professional & scientific | 2024 |
| J H Ogden Limited | Wholesale & retail | 2016 |
| J K &L Ltd | Real estate | 2026 |
| J K Furniture Systems Limited | Manufacturing | 2004 |
| J Maguire Refrigeration Limited | Construction | 2005 |
| J Mcrobb High Class Family Butchers and Delicatessen Limited | Wholesale & retail | 2015 |
| J Morris Pharmacy Limited | Wholesale & retail | 2008 |
| J Newbold Consultant Limited | Professional & scientific | 2020 |
| J P Lythgoe Ltd | Transport & logistics | 2022 |
| J Ryder Logistics Ltd | Transport & logistics | 2021 |
| J Shires Civil Engineering Ltd | Construction | 2020 |
| J Sidlow Brickworks Ltd | Construction | 2017 |
| J W Developments Limited | Information & communication | 2001 |
| J Walsh Kitchen & Bedroom Fitting Services Ltd | Construction | 2019 |
| J Waterworth GEO Consulting Limited | Professional & scientific | 2025 |
| J Wood Electrical Ltd | Construction | 2024 |
| J Y Kinsha Properties Limited | Other services | 2016 |
| J&Bn Design and Build Ltd | Construction | 2026 |
| J&C Power Ltd. | Construction | 2022 |
| J&F Hospitality Limited | Hospitality | 2026 |
| J&J Phone Drop Ltd | Wholesale & retail | 2020 |
| J&J Properties Management Ltd | Real estate | 2025 |
| J&J Property Real Estate Ltd | Real estate | 2025 |
| J&J Property Ventures Ltd | Real estate | 2026 |
| J&M Demolition Limited | Construction | 2023 |
| J&M Landscaping (NW) Limited | Administrative & support | 2023 |
| J&M Recycled Aggregates Limited | Water & waste | 2023 |
| J&M Residential Property Ltd | Construction | 2023 |