Limited attention and the earnings announcement returns of past stock market winners
研究发现，过去12个月涨幅最大的股票在盈余公告前5天平均获得1.58%的超额收益，公告后5天则平均亏损1.86%。个体投资者的注意力驱动交易行为是这一异常回报模式的部分原因。
We document that stocks with the strongest prior 12-month returns experience a significant average market-adjusted return of 1.58% during the five trading days before their earnings announcements and a significant average market-adjusted return of −1.86% in the five trading days afterward. These returns remain significant even after accounting for transactions costs. We empirically test a limited attention explanation for these anomalous returns—that stocks with sharp run-ups tend to attract individual investors’ attention and investment dollars, particularly before their earnings announcements. Our analysis suggests that the trading decisions of individual investors are at least partly responsible for the return pattern that we observe.