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Short seller's paradise: Panic means big profits

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Big investors who make money by selling stock short have enjoyed a money-making paradise. The Wall Street Journal provided a valuable public service by investigating how they made money shorting Morgan Stanley (NYSE: MS), helping its stock plunge in mid-September.

Conceptually, what shorts did was very simple -- they shorted the stock then they bought thinly-traded Credit Default Swaps (CDSs) on the bonds of the stock they wanted to short. (The Journal quotes Erik Sirri, a Babson Finance professor now working at the SEC whose office is next to mine, on the ease of manipulating CDS premiums.) This forces up the premiums and scares investors. The short sellers, in many cases, also withdraw their considerable funds from the targets' prime brokerage accounts; when asked why, they say that the firm in question is going bankrupt.

Needless to say, these rumors get spread around trading desks. Whether or not they're true, many investors are inclined to withdraw their money first and ask questions later. (The bankruptcy of Lehman Brothers highlighted the dangers of waiting too long to get out -- in the form of frozen hedge fund accounts.) As the stock goes down, the CDS premiums rise further, which spooks more investors and creates a vicious downward cycle for the stock -- and a short seller's paradise.

The same kind of dynamic may well have been behind last week's precipitous decline in Citigroup (NYSE: C). The question for government is whether it makes sense for taxpayers to fork over tens of billions of dollars to rescue big financial institutions for the benefit of these short sellers' profits.

Peter Cohan is President of Peter S. Cohan & Associates. He also teaches management at Babson College and edits The Cohan Letter. He owns Citigroup stock and has no financial interest in the other securities mentioned.

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Last updated: November 22, 2009: 03:14 PM

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