| ISM Electrical Solutions Ltd | Construction | 2022 |
| ISO Property Developments Limited | Construction | 2004 |
| ISO Quality Services Limited | Professional & scientific | 2000 |
| ISO Training Services Ltd | Extraterritorial | 2010 |
| Issy Spirits Limited | Hospitality | 2025 |
| Istatache Ltd | Transport & logistics | 2026 |
| Istech Ltd | Professional & scientific | 2007 |
| Isted Design Ltd | Professional & scientific | 2018 |
| IT Doesn'T Have to Cost the Earth Ltd | Professional & scientific | 2018 |
| IT Managed Consultancy Ltd | Information & communication | 2022 |
| IT Strong Limited | Wholesale & retail | 2022 |
| IT Support Services Group Ltd | Information & communication | 2018 |
| IT Support Services Team Limited | Information & communication | 2020 |
| It's Appened Ltd | Manufacturing | 2015 |
| Itaxis Worcester Ltd | Transport & logistics | 2023 |
| Itil Works Limited | Information & communication | 2005 |
| Its-Plastics Limited | Professional & scientific | 2002 |
| Ityres.Com Worcester Ltd | Wholesale & retail | 2020 |
| Iulian Secrieriu Ltd | Health & social care | 2022 |
| Ivill Properties Limited | Real estate | 2013 |
| Ivison Guitars Ltd | Manufacturing | 2025 |
| Iviva Consulting Ltd | Professional & scientific | 2013 |
| Ivory & Co. Bridal Ltd | Wholesale & retail | 2019 |
| Ivoryland Limited | Real estate | 1985 |
| IVY & ROO Ltd | Wholesale & retail | 2019 |
| IVY Consulting Ltd | Information & communication | 2015 |
| IVY Media Ltd | Information & communication | 2025 |
| IWM Limited | Construction | 2021 |
| Iziconsulting Ltd | Information & communication | 2025 |
| Izzatf Limited | Wholesale & retail | 2019 |
| J & J Solar Car Park Ltd | Manufacturing | 2025 |
| J a (Associates) Limited | Professional & scientific | 2002 |
| J and R Anstey Limited | Agriculture & fishing | 2015 |
| J and S Boutique Ltd | Wholesale & retail | 2026 |
| J C DEW Holdings Ltd | Administrative & support | 2025 |
| J C SYS Limited | Information & communication | 2007 |
| J F Lettings Ltd | Real estate | 2020 |
| J K Catering (Lowesmoor) Ltd | Hospitality | 2013 |
| J Kreft Ltd | Hospitality | 2026 |
| J Layton Electrical Limited | Construction | 2024 |
| J Lynch Plastering Ltd | Construction | 2018 |
| J M Sneddon Limited | Construction | 2019 |
| J Maverick & Company Ltd | Hospitality | 2024 |
| J P Davis Limited | Wholesale & retail | 2013 |
| J P L Fire Services Limited | Professional & scientific | 2016 |
| J P W Racing Tipster Limited | Arts & recreation | 2016 |
| J S Building and Roofing Limited | Construction | 2023 |
| J Summerton Design Limited | Information & communication | 2008 |
| J V T Cafe Ltd | Hospitality | 2020 |
| J V T Catering Ltd | Hospitality | 2020 |
| J&A Trade Limited | Wholesale & retail | 2025 |
| J&K Barber Shop Limited | Other services | 2018 |
| J&S Home and Garden Maintenance Ltd | Construction | 2019 |
| J&V Logistics Ltd | Transport & logistics | 2021 |
| J. S. Eyewear Ltd | Wholesale & retail | 2023 |
| J.A.S Eyewear Limited | Wholesale & retail | 2025 |
| J.H. Mould & Co. Limited | Manufacturing | 1975 |
| J.N.W. Property Developments Ltd | Real estate | 2018 |
| J.T.Venables(Kempsey)Limited | Agriculture & fishing | 1945 |
| J.W. Skip Hire Limited | Water & waste | 2005 |
| J.W. Tafft Orthodontics Limited | Health & social care | 2013 |
| J.W.Driver Ltd | Transport & logistics | 2014 |
| J.W.Hill Precision Engineering Limited | Manufacturing | 1955 |
| J.W.Lane(Agricultural Engineers)Limited | Manufacturing | 1961 |
| J6 Breakfast Ltd | Hospitality | 2026 |
| JA Access Ltd | Construction | 2023 |
| Jabeenzz Limited | Real estate | 2025 |
| Jack Campey Productions Ltd | Arts & recreation | 2016 |
| Jack Ford Estates Ltd | Real estate | 2024 |
| Jack Green Photographic Services Ltd | Professional & scientific | 2021 |
| Jack Smith Commercials Ltd | Manufacturing | 2024 |
| Jack's Bar & Diner Ltd | Real estate | 2019 |
| Jackson AEC Ltd | Professional & scientific | 2022 |
| Jackson Alexander & Co. Ltd | Real estate | 2023 |
| Jackson Brothers Limited | Real estate | 2022 |
| Jackson Resources Ltd | Other services | 2020 |
| Jacob Property Developments Ltd | Real estate | 2025 |
| Jacobs Faro Limited | Professional & scientific | 2007 |
| Jacobs Severn Limited | Professional & scientific | 2016 |
| Jaeiland Property Ltd | Real estate | 2025 |
| Jael Properties Limited | Real estate | 2012 |
| Jagjan Limited | Health & social care | 2016 |
| Jakeman Builders Limited | Construction | 2018 |
| Jaks Coffee Ltd | Hospitality | 2021 |
| Jama Consulting Limited | Information & communication | 2011 |
| Jamaica WAH Gwaan Ltd | Hospitality | 2023 |
| Jamba Entertainment Limited | Information & communication | 2011 |
| James Ball Contracting Ltd | Professional & scientific | 2013 |
| James Brown Consultancy Ltd | Health & social care | 2025 |
| James Hughes Design Limited | Professional & scientific | 2026 |
| James Johnson Enterprises Ltd | Hospitality | 2021 |
| James LEE Plumbing Solutions Limited | Construction | 2021 |
| James Marshall Ltd | Financial services | 2020 |
| James Prosser Holdings Ltd | Real estate | 2026 |
| James Wilson Worcester Property Sales Ltd | Real estate | 2019 |
| James Wright Accountants Ltd | Professional & scientific | 2025 |
| Jamie Atkin Limited | Financial services | 2026 |
| Jamie Joseph Evans Limited | Information & communication | 2022 |
| Jamie Roche Limited | Other services | 2014 |
| Jammy Recruitment Limited | Administrative & support | 2020 |