Working papers
with Florian Berg and Zacharias Sautner
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.
Selected presentations (*incl. by co-authors):
- Frankfurt School of Finance & Management Brown Bag Series (Nov. 2020)
- Fondazione Eni Enrico Mattei (Apr. 2021)
- University of St.Gallen - Seminar (Apr. 2021)
- University of Oxford - Saïd Business School Seminar (Apr. 2021)
- Asian Bureau of Finance and Economic Research (ABFER) Annual Conference (May 2021)
- Professional Risk Managers' International Association (PRMIA) Thought Leadership Webinar (Jun. 2021)
- 13th Annual Alliance for Research on Corporate Sustainability (ARCS) Research Conference* (Jun. 2021)
- Frankfurt School of Finance & Management Conference on ESG Ratings (Sep. 2021)
- UN PRI Academic Network Week 2021 (Sep. 2021)
- 27th Annual Meeting of the German Finance Association (DGF) (Oct. 2021)
- University of Bern - Seminar (Oct. 2021)
- Humboldt University of Berlin - Seminar (Nov. 2021)
- HEC Paris - Seminar (Dec. 2021)
- Corporate Governance Symposium 2022 by Weinberg Center & ECGI (Mar. 2022)
- CFA Society Slovakia: ESG Investment Summit 2022 (Apr. 2022)
- SFS Cavalcade North America 2022* (May 2022)
- National Bank of Slovakia (NBS) - Seminar (Jun. 2022)
- European Financial Management Association (EFMA) (Jun. 2022)
- 2022 Cornell University ESG Investing Research Conference* (Jul. 2022)
- 2nd NTHU Symposium on Sustainable Finance and Economics (Aug. 2022)
- Tilburg University - Seminar (Sep. 2022)
- European Commission DG FISMA - Presentation (Sep. 2022)
- Copenhagen Business School (CBS) - Seminar (Dec. 2022)
- American Finance Association (AFA) (Jan. 2023)
Featured in:
Awards:
- Winner of the John L. Weinberg/IRRCi USD 10,000 Research Award from the Weinberg Center at the University of Delaware (at the 2022 Corporate Governance Symposium by ECGI)
- Winner of the Best Paper Award at the 2022 Cornell University ESG Investing Research Conference (USD 10,000)
- Runner-up at CFA Society Germany Investment Research Award 2022
Note:
- The paper circulated previously under the name: Rewriting History II: The (Un)Predictable Past of ESG Ratings
Solo-authored
Abstract: This paper presents the first large-scale empirical analysis of the pledging phenomenon among U.S. CEOs. Between 2007 and 2016, 7.6% of publicly listed U.S. firms disclosed that their CEOs had pledged company stock as collateral for a loan. On average, CEOs pledge 38% of their shares. The mean loan value is an economically sizeable $65 million. CEOs use the funds to either double down (6.0%), hedge their ownership (3.5%), or to obtain liquidity while maintaining ownership (90.5%). My event study results reveal that stock market participants view pledging as value-enhancing, but perceive significant pledging as value-destroying. Similarly, I find no evidence of its negative shareholder value consequences, except for CEOs who engage in significant pledging.
Selected presentations:
- EPFL-UNIL Brown Bag Series (Lausanne, Switzerland, 2019)
- LSE PhD Seminar (London, United Kingdom, 2019)
- SFI Research Days (Gerzensee, Switzerland, 2019)
- SFI Academic Job Market Workshop (Lausanne, Switzerland, 2019)
- American Finance Association (AFA) PhD Student Poster Session (San Diego, USA, 2020)
- INSEAD (Paris, France, 2020)
- Goethe University Frankfurt (Frankfurt, Germany, 2020)
- Frankfurt School of Finance & Management (Frankfurt, Germany, 2020)
- University of Southampton (virtual, 2020)
- Junior European Finance Seminar (virtual, 2020)