Using 1990 through 2013 data of U.S. firms with foreign operations, we show that (i) the serial correlation of analyst forecast errors increases in the extent of international diversification, (ii) post‐earnings‐announcement drift ( PEAD ) based on analyst forecast errors increases in the extent of international diversification, and (iii) the impact of international diversification on the serial correlation of analyst forecast errors and its associated drift is significantly reduced after the implementation of SFAS 131 on segment disclosures. When we replicate our tests using seasonally differenced earnings, we fail to observe similar patterns. Overall, our results suggest that investors’ underreaction to announced earnings is a likely explanation for PEAD . Our findings also indicate that disclosures required under SFAS 131 are useful to analysts in forming efficient earnings expectations, thereby helping capital market participants in the pricing of internationally diversified firms’ earnings.

Under the assumption that audit quality relates positively to unobservable financial reporting quality, we investigate whether audit quality is associated with the predictability of accounting earnings by focusing on analyst earnings forecast properties. The evidence shows that analysts' earnings forecast accuracy is higher and the forecast dispersion is smaller for firms audited by a Big 5 auditor. We further find that auditor industry specialization is associated with higher forecast accuracy and less forecast dispersion in the non-Big 5 auditor sample but not in the Big 5 auditor sample. Overall, our results suggest that high-quality audit provided by Big 5 auditors and industry specialist non-Big 5 auditors is associated with better forecasting performance by analysts.