The Journal of Finance

Characteristics of Risk and Return in Risk Arbitrage

Published: 12/17/2002   |   DOI: 10.1111/0022-1082.00401

Mark Mitchell, Todd Pulvino

This paper analyzes 4,750 mergers from 1963 to 1998 to characterize the risk and return in risk arbitrage. Results indicate that risk arbitrage returns are positively correlated with market returns in severely depreciating markets but uncorrelated with market returns in flat and appreciating markets. This suggests that returns to risk arbitrage are similar to those obtained from selling uncovered index put options. Using a contingent claims analysis that controls for the nonlinear relationship with market returns, and after controlling for transaction costs, we find that risk arbitrage generates excess returns of four percent per year.

Limited Arbitrage in Equity Markets

Published: 12/17/2002   |   DOI: 10.1111/1540-6261.00434

Mark Mitchell, Todd Pulvino, Erik Stafford

We examine 82 situations where the market value of a company is less than its subsidiary. These situations imply arbitrage opportunities, providing an ideal setting to study the risks and market frictions that prevent arbitrageurs from immediately forcing prices to fundamental values. For 30 percent of the sample, the link between the parent and its subsidiary is severed before the relative value discrepancy is corrected. Furthermore, returns to a specialized arbitrageur would be 50 percent larger if the path to convergence was smooth rather than as observed. Uncertainty about the distribution of returns and characteristics of the risks limits arbitrage.

The Impact of Public Information on the Stock Market

Published: 07/01/1994   |   DOI: 10.1111/j.1540-6261.1994.tb00083.x

MARK L. MITCHELL, J. HAROLD MULHERIN

We study the relation between the number of news announcements reported daily by Dow Jones & Company and aggregate measures of securities market activity including trading volume and market returns. We find that the number of Dow Jones announcements and market activity are directly related and that the results are robust to the addition of factors previously found to influence financial markets such as day‐of‐the‐week dummy variables, news importance as proxied by large New York Times headlines and major macroeconomic announcements, and noninformation sources of market activity as measured by dividend capture and triple witching trading. However, the observed relation between news and market activity is not particularly strong and the patterns in news announcements do not explain the day‐of‐the‐week seasonalities in market activity. Our analysis of the Dow Jones database confirms the difficulty of linking volume and volatility to observed measures of information.

Price Pressure around Mergers

Published: 11/27/2005   |   DOI: 10.1111/j.1540-6261.2004.00626.x

Mark Mitchell, Todd Pulvino, Erik Stafford

This paper examines the trading behavior of professional investors around 2,130 mergers announced between 1994 and 2000. We find considerable support for the existence of price pressure around mergers caused by uninformed shifts in excess demand, but that these effects are short‐lived, consistent with the notion that short‐run demand curves for stocks are not perfectly elastic. We estimate that nearly half of the negative announcement period stock price reaction for acquirers in stock‐financed mergers reflects downward price pressure caused by merger arbitrage short selling, suggesting that previous estimates of merger wealth effects are biased downward.