| IN Property Investment Group Ltd | Real estate | 2026 |
| IN Sinc Solutions Limited | Administrative & support | 2024 |
| Incentral Ltd | Financial services | 2023 |
| Inclusive Approach Ltd | Other services | 2023 |
| Independent Audiology Services Ltd | Administrative & support | 2022 |
| Independent Futures (UK) Limited | Health & social care | 2022 |
| Independent Futures Limited | Health & social care | 2019 |
| Individual Eyes Limited | Professional & scientific | 2007 |
| Infinity Flooring & Tools Ltd | Wholesale & retail | 2023 |
| Inflect Interiors Ltd | Construction | 2026 |
| Influx Electrix Ltd | Construction | 2025 |
| Innovationnw Ltd | Construction | 2020 |
| Innovative Eyecare (Holding Co) Limited | Financial services | 2019 |
| Innovative Eyecare Limited | Health & social care | 2002 |
| Inspeyer Ltd | Health & social care | 2010 |
| Insurefit Vehicle Installations Limited | Manufacturing | 2014 |
| Integrated Optical Limited | Wholesale & retail | 2003 |
| Integrity Network Solutions Ltd | Administrative & support | 2026 |
| Interior 55 Limited | Wholesale & retail | 2020 |
| IO Doncaster Limited | Wholesale & retail | 2021 |
| IO Jacksons Limited | Wholesale & retail | 2021 |
| IO Mullens (Runcorn) Limited | Wholesale & retail | 2021 |
| IO Mullens (Stockton) Limited | Wholesale & retail | 2021 |
| IO Spurretts Limited | Wholesale & retail | 2021 |
| IP Global Holdings Ltd | Financial services | 2025 |
| Ipram Asset Finance Ltd | Administrative & support | 2011 |
| Irene's Housing Limited | Real estate | 2014 |
| Iris BHC Limited | Manufacturing | 2013 |
| Irlam Optical Ltd | Health & social care | 2012 |
| Iscarha Properties Limited | Real estate | 2010 |
| Issa Optical Ltd | Health & social care | 2007 |
| Italian Star Pizza Limited | Hospitality | 2023 |
| IV (NW) Ltd | Administrative & support | 2017 |
| Ivan R Cammack Ltd | Health & social care | 2013 |
| Ivory Grill Ltd | Hospitality | 2026 |
| J & N Commercial Supplies Ltd | Wholesale & retail | 2025 |
| J Ayres Roofcare Ltd | Construction | 2025 |
| J F Bryan Holdings Limited | Health & social care | 2009 |
| J Fairclough Electrical Ltd | Construction | 2023 |
| J L Nelson Consultancy Ltd | Professional & scientific | 2021 |
| J L R Combustion Engineering Ltd | Manufacturing | 2004 |
| J L T (Rossendale) Limited | Administrative & support | 2008 |
| J Lewis Engineering Ltd | Professional & scientific | 2025 |
| J Oliver Radley Opticians Limited | Health & social care | 2003 |
| J R Joinery & Building Ltd | Construction | 2021 |
| J W Haworth Ltd. | Administrative & support | 2020 |
| J W Plumbing and Building Services Ltd | Construction | 2018 |
| J&C Briddon Limited | Health & social care | 2019 |
| J&D Harrison Holdings Ltd | Financial services | 2024 |
| J&Pae Limited | Wholesale & retail | 2021 |
| J&S Asset Integrity Ltd | Construction | 2026 |
| J. Hanks Limited | Health & social care | 2010 |
| J. Wooding Opticians Ltd | Health & social care | 2009 |
| J.F. Bryan Limited | Health & social care | 1985 |
| J.P. Optical Limited | Health & social care | 2011 |
| J4 Caravans Ltd | Wholesale & retail | 2024 |
| J4 Hub Limited | Wholesale & retail | 2010 |
| Jackson & Jones Limited | Professional & scientific | 2012 |
| James Bryan Opticians Limited | Health & social care | 1998 |
| James Kidner Opticians Limited | Health & social care | 2004 |
| Janet Porter Optical LLP | | 2011 |
| Janus Image Processing Limited | Professional & scientific | 2002 |
| Jaqui Hodgkinson Communications Ltd | Professional & scientific | 2024 |
| Jasper Optical Ltd | Professional & scientific | 2025 |
| Jaws GAS Services Ltd | Construction | 2021 |
| JAY MO Broadcasting Ltd | Arts & recreation | 2008 |
| JAY P Properties Holdings Limited | Financial services | 2024 |
| JAY P Properties Limited | Real estate | 2015 |
| JBR Systems Limited | Information & communication | 2012 |
| JBY Roofing Ltd | Construction | 2022 |
| JC Autosports Limited | Wholesale & retail | 2022 |
| JC Properties and Lettings Limited | Real estate | 2024 |
| JD Drives & Patios Limited | Construction | 2018 |
| JDS Property Holdings Limited | Real estate | 2021 |
| Jervis Inns Limited | Hospitality | 2013 |
| Jheel Darwen Ltd | Hospitality | 2026 |
| JHS Developments Limited | Construction | 2021 |
| Jilani Properties Ltd | Real estate | 2018 |
| JIM Brown Limited | Wholesale & retail | 2003 |
| Jjchase Holdings Ltd | Financial services | 2025 |
| Jjchase Ltd | Professional & scientific | 2021 |
| JJW Accountants Ltd | Professional & scientific | 2021 |
| JJW Investment Group Ltd | Financial services | 2022 |
| Jkelly Rentals Ltd | Real estate | 2024 |
| JKY Commercials Limited | Wholesale & retail | 2024 |
| Jlucas Sales Ltd | Wholesale & retail | 2026 |
| JM Empire Limited | Education | 2023 |
| JMC Marshmallows Ltd | Administrative & support | 2017 |
| Joanne Ormesher & Co Ltd | Professional & scientific | 2020 |
| JOG Development and Construction Limited | Construction | 2023 |
| Jogabola Blackburn Ltd | Education | 2025 |
| John Goatman Limited | Wholesale & retail | 1957 |
| John Weygang (Churchdown) Ltd | Wholesale & retail | 2021 |
| John Weygang (Hucclecote) Ltd | Wholesale & retail | 2021 |
| John Weygang (Quedgeley) Ltd | Wholesale & retail | 2021 |
| Johnson & Furze Optometrists Ltd | Wholesale & retail | 2013 |
| Jojo Active Ltd | Wholesale & retail | 2025 |
| Jones-Barrick Opticians Limited | Wholesale & retail | 2013 |
| JPJ Pack Holdings Limited | Financial services | 2024 |
| JRG Carrington Limited | Wholesale & retail | 2017 |