Market reactions to the Business Roundtable August 19, 2019 announcement on the Purpose of a Corporation

The Business Roundtable's “Purpose of a Corporation” letter announced a shift from stockholder primacy to stakeholder primacy. Interestingly, we contend the letter's language employed a technical efficiency emphasis, suggesting a firm's executives chose to make this shift because they believed doing so would improve the firm's financial performance, via improved corporate governance. We examine whether investors actually accepted the technical efficiency arguments at face value, or in contrast believed the announcements were merely a “rational myth,” what management thought investors would want to hear. We employ a 2-day cumulative abnormal return (CAR) event study for 140 publicly-held firms. Overall, we find investor support for the announcement. In addition, we found how returns to firms with prior similar announcements were negative at the time of the announcement. Also, the returns for firms having multiple signatories were positive and significant.