Article Abstract:
Whether insider trading affects stock prices is central to both the current debate over whether insider trading is harmful or pervasive, and to the broader public policy issue of how best to regulate securities markets. Using previously unexplored data on illegal insider trading from the Securities and Exchange Commission, this paper finds that the stock market detects the possibility of informed trading and impounds the information into the stock price. Specifically, the abnormal return on an insider trading day averages 3%, and almost half of the pre-announcement stock price run-up observed before takeovers occurs on insider trading days. Both the amount traded by the insider and additional trade-specific characteristics lead to the market's recognition of the informed trading. (Reprinted by permission of the publisher.)
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Article Abstract:
This paper explores stock price behavior surrounding withdrawn buyout proposals to determine whether managers' proposal announcements reveal any information which is unrelated to the efficiency gains associated with completed buyouts. On average, firms whose managers withdraw buyout proposals do not sustain significantly positive stock price effects unless they receive subsequent acquisition bids. In addition, managers of firms with completed buyouts are no more likely to have access to inside information than managers who withdrew proposals. I interpret this evidence as inconsistent with the notion that inside information commonly motivates management buyout proposals. (Reprinted by permission of the publisher.)
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Article Abstract:
The costs incurred by liquidity traders in searching for better quotes is incorporated into a model that shows centralized markets' expected spreads are smaller and are preferred by liquidity traders, but fragmented markets are preferred by market makers.
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