An Investigation of Market Microstructure Impacts on Event Study Returns
Ronald C. Lease
Purdue University - Krannert School of Management; National Bureau of Economic Research (NBER)
Ronald W. Masulis
University of New South Wales - Australian School of Business; European Corporate Governance Institute (ECGI); Financial Research Network (FIRN)
Tulane University - Accounting & Taxation
Journal of Finance, Vol. 46, No. 4, pp. 1523-1536, 1991
We investigate the importance of bid-ask spread induced biases on event date returns as exemplified by seasoned equity offerings by NYSE listed firms. We document significant negative return biases on the offering day which explain a large portion of the negative event date return documented in the literature. Buy/sell order flow imbalance is prominent around the offering and induces a relatively large spread bias. If order imbalances are suspected, the researcher can use returns calculated from the midpoint of the closing bid and ask quotes, instead of returns calculated from closing transaction prices, to avoid this return bias.
Number of Pages in PDF File: 23
Keywords: Seasoned equity offering, market microstructure, bid-ask bounce, order flow imbalance
JEL Classification: G14, G24, G32
Date posted: May 8, 2006
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