| Ipeople Associates Limited | Administrative & support | 2012 |
| IPS Construction South East Limited | Construction | 2019 |
| Ipsilon Solutions Ltd | Professional & scientific | 2024 |
| Irepair Online Ltd | Wholesale & retail | 2024 |
| Irun Dudu Limited | Other services | 2021 |
| IS IT Fast Media Ltd | Information & communication | 2021 |
| Iskandar Consulting Limited | Professional & scientific | 2022 |
| Island Road (Hersden) Management Company Limited | Households | 2004 |
| Island Road Car Sales (Sturry) Limited | Wholesale & retail | 1976 |
| Isles Limited | Wholesale & retail | 2022 |
| Isogen Ltd | Professional & scientific | 2011 |
| Isometric HQ Ltd | Information & communication | 2022 |
| IST1903 Ltd | Other services | 2025 |
| ITA Prestige Ltd | Professional & scientific | 2020 |
| Italian Fashion (2019) Limited | Wholesale & retail | 2019 |
| Itech Distribution Ltd | Information & communication | 2019 |
| Itech Pro Solutions Ltd | Information & communication | 2024 |
| ITI Express Ltd | Transport & logistics | 2013 |
| Ivan Edgar Wealth Management Limited | Financial services | 2007 |
| IVP Accounts Ltd. | Professional & scientific | 2011 |
| IVY Bridge Construction Limited | Construction | 2024 |
| IVY Neil Ltd | Wholesale & retail | 2022 |
| Ivylead Limited | Professional & scientific | 2025 |
| Iwatch Limited | Information & communication | 2004 |
| Iworx (UK) Ltd | Professional & scientific | 2012 |
| J & E Events Limited | Professional & scientific | 2019 |
| J & J Systems UK Limited | Information & communication | 1998 |
| J & K Sheetmetal Limited | Manufacturing | 2003 |
| J & P Rowland Management Limited | Real estate | 2010 |
| J a Squires Construction Limited | Construction | 2015 |
| J Byrne Holdings Ltd | Financial services | 2024 |
| J C Performance Roofing Limited | Construction | 2022 |
| J Crome Limited | Hospitality | 2016 |
| J Farnham Joinery Limited | Manufacturing | 2013 |
| J J Mullane Ltd | Construction | 2002 |
| J L Towers Electrical Ltd | Construction | 2015 |
| J Lindsay Limited | Health & social care | 2020 |
| J Long Electrical Ltd | Construction | 2024 |
| J Martin Ltd | Professional & scientific | 2010 |
| J N Express Ltd | Wholesale & retail | 2018 |
| J PJ Cooper Holdings Limited | Financial services | 2024 |
| J Wigglesworth Holdings Limited | Transport & logistics | 2026 |
| J&D Operations Ltd | Mining & quarrying | 2024 |
| J&J Aggregates Ltd | Wholesale & retail | 2026 |
| J&J Renovations Ltd | Real estate | 2024 |
| J&M Art Limited | Wholesale & retail | 2016 |
| J&S Land and Property Ltd | Construction | 2025 |
| J. Dylan Holdings Ltd | Financial services | 2021 |
| J. Edwards Estates Limited | Real estate | 2024 |
| JA Advisory Limited | Professional & scientific | 2025 |
| Jacaranda Music Group Limited | Financial services | 2020 |
| Jacaranda Records Limited | Information & communication | 2018 |
| Jacaranda Studios Limited | Information & communication | 2020 |
| Jack of ALL Ltd | Wholesale & retail | 2020 |
| Jackdaw Interiors Ltd | Wholesale & retail | 2024 |
| Jackson Court RTM Company Limited | Households | 2013 |
| Jackson Electrical Services Kent Limited | Construction | 2019 |
| Jacobs Builders Limited | Real estate | 1988 |
| Jaeglo Limited | Health & social care | 2016 |
| Jagger Creative Communication LLP | | 2007 |
| Jake Sauvage Land & New Homes Limited | Real estate | 2024 |
| Jali Limited | Manufacturing | 1990 |
| James Clague Architects Limited | Professional & scientific | 2013 |
| James Dixey Limited | Professional & scientific | 2013 |
| James Hughes Formwork Limited | Construction | 2007 |
| James Mccarthy Consulting Limited | Professional & scientific | 2025 |
| JAN a Harding Limited | Real estate | 2016 |
| JAN Day Workshops Limited | Education | 2016 |
| Jane Withers Limited | Administrative & support | 2008 |
| Jasleen Enterprise Ltd | Hospitality | 2023 |
| Jaxon Joinery Ltd | Manufacturing | 2018 |
| Jaycop Limited | Information & communication | 2016 |
| Jayshreen Limited | Wholesale & retail | 2009 |
| JB Construction (South East) Limited | Construction | 2006 |
| JB Engineering Consulting Limited | Professional & scientific | 2019 |
| JB Haulage & Sons Ltd | Transport & logistics | 2025 |
| JBD Sporting Limited | Agriculture & fishing | 2025 |
| JBL Encombe Limited | Construction | 2023 |
| JBL Lifestyle (Plover Road 2) Limited | Construction | 2021 |
| JBL Lifestyle Construction Limited | Construction | 2020 |
| JBL Lifestyle Homes Limited | Construction | 2023 |
| JBL Lifestyle Three Limited | Construction | 2023 |
| JC Surveying Ltd | Construction | 2017 |
| Jcng Ltd | Real estate | 2020 |
| JCP Assets Ltd | Real estate | 2025 |
| Jcross Ltd | Construction | 2013 |
| JD Distribution Direct Ltd | Wholesale & retail | 2023 |
| JD Grounds Services Ltd | Administrative & support | 2025 |
| JDC Brothers Limited | Real estate | 2024 |
| JDE Scenic Painting Ltd | Arts & recreation | 2014 |
| JDG Access Limited | Construction | 2015 |
| JDI Solutions Ltd | Administrative & support | 2002 |
| JDP Rail Limited | Construction | 2024 |
| JDS Homes Ltd. | Construction | 2008 |
| JED Jones Ltd | Real estate | 2025 |
| Jedahup Company Limited | Health & social care | 2022 |
| Jeff Group Ltd | Financial services | 2026 |
| Jelka Engineering Ltd | Wholesale & retail | 2021 |
| Jelka Group Holdings Ltd | Financial services | 2021 |
| Jelka Limited | Wholesale & retail | 2019 |