| Year | Detail |
| 1998 |
INEOS was established. |
| 2001 |
INEOS acquired Crossfield and formed INEOS SILICAS. |
| 2003 |
INEOS acquired Methanova GMBH to form INEOS PARAFORM. |
| 2005 |
INEOS acquired EVC and became INEOS VINYLS. |
| 2010 |
INEOS moved its headquarters from the U.K. to Switzerland. |
| 2014 |
INEOS acquired SASOL SOLVENTS GERMANY GMBH. |
| 2015 |
INEOS introduced its new PTA technology in the Aromatics facility in Zhuhai, China. |
| 2016 |
INEOS moved its headquarters back to the U.K. |
| 2017 |
INEOS upgraded its Aromatics PTA plant in Cooper River, South Carolina. |
| |
INEOS acquired the complete oil & gas business of Dong Energy. |
| 2018 |
INEOS acquired Ashland Composites business for $1.1 billion. |
| 2019 |
INEOS developed Infinia Recycling Technology to make pet plastics recyclable. |
| |
INEOS opened an Advanced Polymer Pilot plant in Rosignano, Italy. |
| 2020 |
INEOS launched its new hydrogen business to accelerate the drive to net zero carbon emissions. |
| 2021 |
INEOS donated $100 million to develop new Oxford University to fight antimicrobial resistance. |