Do investors perceive a change in audit quality following the rotation of the engagement partner?

Though Section 203 of the Sarbanes-Oxley Act (SOX) calls for the rotation of the audit partner every five years, we do not know whether investors value audit partner rotation. This is an important issue since many in the auditing profession believe that mandatory rotation of the audit partner is unnecessary and may in fact impair audit quality. We identify a sample of firms that disclosed changes in the engagement partner in the proxy statement and examine whether equity investors perceive a change in audit quality following the partner rotation. We find a significant increase in earnings informativeness following audit partner rotation. We also find that short sellers regard earnings in the post-rotation to be of higher quality than earnings prior to the rotation. Finally, cost of equity capital is lower following partner rotation. Our findings have important implications for the regulators, auditors, and investors. (C) 2019 Elsevier Inc. All rights reserved.