| Gazelles Artdeco Limited | Wholesale & retail | 2005 |
| GB Elite Property Management Limited | Real estate | 2020 |
| GKK Curry Ltd | Hospitality | 2018 |
| Grangemouth Energy Company Limited | Energy | 2018 |
| Green Orange Consultancy Limited | Information & communication | 2025 |
| GWT Cafe Limited | Hospitality | 2025 |
| Halicilla Limited | Agriculture & fishing | 2015 |
| Hampshire Architecture Ltd | Professional & scientific | 2021 |
| Hampshire Aviation LLP | | 2007 |
| Hampshire Workspace Limited | Administrative & support | 1980 |
| Harmony Creative Print Ltd | Manufacturing | 2015 |
| Haumaruuk Ltd | Professional & scientific | 2021 |
| HE Holdco Ltd | Financial services | 2019 |
| Hejw Holdco Ltd | Financial services | 2019 |
| Hello Tree Properties Ltd | Real estate | 2015 |
| HGH (Staff Houses) Limited | Real estate | 2014 |
| Home Grown Hotels Limited | Hospitality | 2011 |
| Homes of Hampshire Limited | Real estate | 2017 |
| Honeyheath Limited | Real estate | 1992 |
| Honeyheath Property Ltd | Real estate | 2004 |
| Hopwood Sales & Consultancy Limited | Wholesale & retail | 2024 |
| Hounsell Management Ltd | Other services | 2012 |
| Hurstfield Limited | Professional & scientific | 2001 |
| Hwaet Ltd | Information & communication | 2026 |
| Hydro Heat South Limited | Construction | 2022 |
| IAN Jones Associates Ltd | Health & social care | 2014 |
| IB2B Ltd | Information & communication | 2002 |
| Imagine Consulting Limited | Professional & scientific | 2024 |
| Imparlour Ltd | Wholesale & retail | 2021 |
| Imperial and Colonial Capital Ltd | Financial services | 2015 |
| Indigo Bay (UK) Limited | Administrative & support | 2003 |
| Ineos (Malta) Company | Professional & scientific | 2008 |
| Ineos 120 Exploration Limited | Mining & quarrying | 2008 |
| Ineos 159 Limited | Arts & recreation | 2019 |
| Ineos 179 Limited | Financial services | 2020 |
| Ineos 2010 Limited | Professional & scientific | 2008 |
| Ineos Acetyls (Korea) Limited | Professional & scientific | 1988 |
| Ineos Acetyls Americas Limited | Professional & scientific | 2000 |
| Ineos Acetyls International Limited | Financial services | 2020 |
| Ineos Acetyls Investments Limited | Professional & scientific | 1935 |
| Ineos Acetyls UK Limited | Manufacturing | 2015 |
| Ineos Aromatics Holdings Limited | Professional & scientific | 2007 |
| Ineos Aromatics Limited | Manufacturing | 2007 |
| Ineos Automotive Limited | Manufacturing | 2018 |
| Ineos Automotive Research Limited | Manufacturing | 2017 |
| Ineos Aviation Limited | Other services | 1994 |
| Ineos Canada Limited | Professional & scientific | 2016 |
| Ineos Capital Limited | Professional & scientific | 1999 |
| Ineos Chemicals France Holdings Limited | Professional & scientific | 2013 |
| Ineos Chemicals Grangemouth Limited | Manufacturing | 2009 |
| Ineos China Holdings II Limited | Professional & scientific | 2022 |
| Ineos China Holdings Limited | Professional & scientific | 2021 |
| Ineos Clipper South B Limited | Mining & quarrying | 2003 |
| Ineos Clipper South C Limited | Mining & quarrying | 2003 |
| Ineos Commercial Services UK Limited | Administrative & support | 2010 |
| Ineos Derivatives France Limited | Professional & scientific | 2008 |
| Ineos E&P (Siri) UK Limited | Mining & quarrying | 1991 |
| Ineos E&P (UK) II Limited | Mining & quarrying | 2024 |
| Ineos E&P (UK) Limited | Mining & quarrying | 2002 |
| Ineos Energy E&P Holdings II Limited | Mining & quarrying | 2024 |
| Ineos Energy E&P Holdings III Limited | Mining & quarrying | 2024 |
| Ineos Energy E&P Holdings Limited | Mining & quarrying | 2024 |
| Ineos Energy LNG Limited | Wholesale & retail | 2022 |
| Ineos Energy Trading and Marketing Holdings Limited | Energy | 2024 |
| Ineos Energy Trading Limited | Energy | 2017 |
| Ineos Films Limited | Manufacturing | 2009 |
| Ineos Finance Company | Professional & scientific | 2008 |
| Ineos Finance Company 1 | Professional & scientific | 2013 |
| Ineos Finance Company 2 | Professional & scientific | 2013 |
| Ineos Finance Company 3 Limited | Professional & scientific | 2014 |
| Ineos Finance PLC | Financial services | 2009 |
| Ineos Fluor Holdings Limited | Professional & scientific | 2000 |
| Ineos Fluor Limited | Manufacturing | 2000 |
| Ineos Fluor Trustees Limited | Manufacturing | 2001 |
| Ineos FPS Limited | Mining & quarrying | 2017 |
| Ineos Grangemouth Limited | Professional & scientific | 2013 |
| Ineos Group Chemicals Limited | Financial services | 2026 |
| Ineos Group Holdings Limited | Professional & scientific | 2001 |
| Ineos Group Life Assurance Trustee Limited | Financial services | 2008 |
| Ineos Group Limited | Professional & scientific | 1998 |
| Ineos Healthcare Holdings Limited | Professional & scientific | 2009 |
| Ineos Healthcare Limited | Professional & scientific | 2002 |
| Ineos Holdings (Investments) Limited | Financial services | 2011 |
| Ineos Holdings II Limited | Professional & scientific | 2026 |
| Ineos Holdings Limited | Professional & scientific | 2001 |
| Ineos Industries Holdings Limited | Professional & scientific | 2009 |
| Ineos Industries Limited | Professional & scientific | 2009 |
| Ineos Industries Property Limited | Real estate | 2015 |
| Ineos Infrastructure (Grangemouth) Limited | Energy | 2009 |
| Ineos Investment Holdings (Germany) Limited | Professional & scientific | 2000 |
| Ineos Manufacturing (Hull) Limited | Manufacturing | 2008 |
| Ineos Nitriles Limited | Manufacturing | 2007 |
| Ineos Offshore BCS Limited | Mining & quarrying | 2015 |
| Ineos Olefins Belgium Holdings Limited | Financial services | 2020 |
| Ineos Overseas Company I Limited | Manufacturing | 2000 |
| Ineos Overseas Company II Limited | Manufacturing | 2000 |
| Ineos Oxide Limited | Manufacturing | 1998 |
| Ineos Properties Limited | Professional & scientific | 2006 |
| Ineos Quattro Chemicals Limited | Financial services | 2026 |
| Ineos Quattro Finance 1 PLC | Financial services | 2020 |