During the week of August 6, 2007, a number of quantitative long/short equity hedge funds experienced unprecedented losses. It has been hypothesized that a coordinated deleveraging of similarly constructed portfolios caused this temporary dislocation in the market. Using the simulated returns of long/short equity portfolios based on five specific valuation factors, we find evidence that the unwinding of these portfolios began in July 2007 and continued until the end of 2007. Using transactions data, we find that the simulated returns of a simple marketmaking strategy were significantly negative during the week of August 6, 2007, but positive before and after, suggesting that the Quant Meltdown of August 2007 was the combined effects of portfolio deleveraging throughout July and the first week of August, and a temporary withdrawal of marketmaking risk capital starting August 8th. Our simulations point to two unwinds---a mini-unwind on August 1st starting at 10:45am and ending at 11:30am, and a more sustained unwind starting at the open on August 6th and ending at 1:00pm---that began with stocks in the financial sector and long Book-to-Market and short Earnings Momentum. These conjectures have significant implications for the systemic risks posed by the hedge-fund industry.
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Length: Date of creation: Nov 2008 Date of revision: Handle: RePEc:nbr:nberwo:14465
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Find related papers by JEL classification: G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions G12 - Financial Economics - - General Financial Markets - - - Asset Pricing G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies G2 - Financial Economics - - Financial Institutions and Services G24 - Financial Economics - - Financial Institutions and Services - - - Investment Banking; Venture Capital; Brokerage G28 - Financial Economics - - Financial Institutions and Services - - - Government Policy and Regulation G32 - Financial Economics - - Corporate Finance and Governance - - - Financing Policy; Capital and Ownership Structure
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Mitchell, Mark & Pedersen, Lasse Heje & Pulvino, Todd, 2007.
"Slow Moving Capital,"
CEPR Discussion Papers
6117, C.E.P.R. Discussion Papers.
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Mark Mitchell & Lasse Heje Pedersen & Todd Pulvino, 2007.
"Slow Moving Capital,"
NBER Working Papers
12877, National Bureau of Economic Research, Inc.
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Mark Mitchell & Lasse Heje Pedersen & Todd Pulvino, 2007.
"Slow Moving Capital,"
American Economic Review,
American Economic Association, vol. 97(2), pages 215-220, May.
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