Abstract
We find that the informed trading measures “abnormal O/S ratio”, “abnormal option volume” and “abnormal implied volatility skew” are negatively related to event period abnormal returns for accelerated share repurchases (ASRs) announcements. This effect is stronger for call options and with more liquid options. The abnormal implied volatility spread has information content only for firms with the more liquid options. Further, we show that abnormal returns are positively (negatively) related to the abnormal call (put) volatility surface for options with longer terms to maturity. Overall, our study provides strong evidence of informed trading around ASR announcements.
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