Current literature is inconclusive as to whether idiosyncratic risk influences future stock returns and the direction of the impact. Earlier studies are based on historical realized volatility. Implied volatilities from option prices represent the market's assessment of future risk and are likely a superior measure to historical realized volatility. Implied idiosyncratic volatilities on firms with traded options are used to examine the relationship between idiosyncratic volatility and future returns. A strong positive link was found between implied idiosyncratic risk and future returns. After considering the impact of implied idiosyncratic volatility, historical realized idiosyncratic volatility is unimportant. This performance is strongly tied to small size and high book‐to‐market equity firms. © 2008 Wiley Periodicals, Inc. Jrl Fut Mark 28: 1013–1039, 2008

openAccessArticle: FalsePage Range: 786-786doi: 10.1016/j.jbankfin.2011.09.012Harvest Date: 2016-01-12 15:11:35issueName: Perspectives on International and Corporate Financecover date: 2012-03-01pubType

Informed traders often use options that are not in‐the‐money due to higher potential gains for a smaller upfront cost. Thus, trading activity by option moneyness should be a gauge of informed option trading. We construct a dollar volume‐weighted average moneyness measure to capture option trading activity at different moneyness levels. Stock returns increase with this measure, suggesting more trading activity in options with higher leverage predicts future stock returns. Our results hold cross‐sectionally and at the portfolio level yielding a Fama–French five‐factor α of 12% per year for all stocks and 33% per year for high implied volatility stocks.

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