Firms vs. Insiders as Traders of Last Resort
Jose M. Marin
Universidad Carlos III de Madrid
November 15, 2006
We explore the role of corporate insiders vs. firms as traders of last resort. We develop a simple model of insider trading in which insiders provide price support, as well as liquidity, in security markets. Consistent with the model predictions we find that in the US markets insiders' trading activities have a clear impact on return distributions. Furthermore, we provide empirical evidence on insiders transactions and firm transactions affecting returns in a different manner. In particular, while insiders' transactions (both purchases and sales) have a strong impact on skewness in the short run and to a lesser extent in short run volatility, company repurchases only have a clear impact on volatility, both in the short and the long run. We provide explanations for this asymmetry.
Number of Pages in PDF File: 37
Keywords: Insider trading, liquidity, short-horizon variance, skewness
JEL Classification: G11, G12, G14, G18
Date posted: November 19, 2006
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