Clariant concludes investigation with preliminary continuing operations EBITDA margin of 15.5 % for 2020, increasing the original result by 50 basis points and of 16.2 % for 2021 AD HOC ANNOUNCEMENT PURSUANT TO ART. 53 LR   Restatement of 2020 financial statements required, implying a continuing operations EBITDA margin of 15.5 % (preliminary, unaudited) vs. 15.0 %...