The following sources were cited in SAP Digital Futures Issue 36: Let’s Be Clear: Transparency as a Strategic Issue.

In 2017, 28% of customers punished companies for bad behavior, a 9% increase since 2013.
1Raphael Bemporad, Liz Courtney, Grant Griglak, Naomi Heckroth, Chris Coulter, Christine De Groot, et al., Brand Purpose in Divided Times: Four Strategies for Brand Leadership (BBMG and Globescan), 2017,

Public reports of misconduct slash a company’s market value by an average of 41%.
Jonathan M. Karpoff, D. Scott Lee, and Gerald S. Martin, “The Cost to Firms of Cooking the Books,” Journal of Financial and Quantitative Analysis, 43, September 2008, p. 581–612,

A good reputation lowers the cost of doing business, attracts investors, and can justify higher prices.
Azish Filabi and Jonathan Haidt, “Ethical Systems Design: What Smart Leaders Are Using to Improve Their Organizations (and the World),” World Economic Forum, January 3, 2017,

Ethical leadership correlates with a nearly fivefold increase in return on assets.
“Measuring the Return on Character,” Harvard Business Review, April 2015,