Is History Repeating Itself? The (Un)predictable Past of ESG Ratings
Working Paper Author/Authors
Abstract
The explosion in ESG research has led to a strong reliance on ESG rating providers. We document widespread changes to the historical ratings of a key rating provider, Refinitiv ESG (formerly ASSET4). Depending on whether the original or rewritten data are used, ESG-based classifications of firms into ESG quantiles and tests that relate ESG scores to returns change. While there is a positive link between ESG scores and firms’ stock market performance in the rewritten data, we fail to observe such a relationship in the initial data. The ESG data rewriting is an ongoing rather than a one-off phenomenon.
© Florian Berg, Kornelia Fabisik, Zacharias Sautner, 2020
All rights reserved. Distributed for discussion purposes only; not to be reproduced without permission.
The views expressed are those of the author(s) and do not necessarily reflect those of ECGI or its members.
For copyright queries or takedown requests, contact wp@ecgi.org.
