zRating Knowledge-Pieces Studies subject to charge Downloads zRating study 2021 (in German) zRating study 2020 (in German) Engagement Report 2021 (in German) Engagement Report 2020 (in German) zRating study 2019 (in German) Engagement Report 2019 (in German) zRating study 2018 (in German) Engagement Report 2018 (in German) zRating study 2017 (in German) zRating study 2016 (in German) zRating study 2015 (in German) Revision of stock corporation law 2015 – zRating Statement (in German) zRating study 2014 (in German)