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The “Friday-Monday Effect” Exposed

madhedgefundtrader's picture




 

Dennis Gartman of the ever interesting The Gartman Letter published an interesting study of the well known “Monday-Friday” effect. The analysis was done by Andrew Greely of Acorn Derivatives in White Plains, NY. If you bought every Friday close this year and sold the Monday close, your return so far would be 14.20%, versus a 0.42% return on the S&P 500. Virtually all the gains would accrue at the Monday morning gap opening.

If you did the reverse, bought the Monday close and sold the Friday close, then your YTD loss would be 11.00%. Apparently, the market is paying a huge premium for traders willing to run the weekend risk, which during the financial crisis, is when all the disasters occurred. I know of several desks that have been working this trade all year long, with much success. On paper you could have made 25.20% on a non leveraged basis, and less once you take execution and other frictional costs out.

The longer this works, the more who will pile into it, until it blows up, as all of these purely quantitative approaches always do. This is symptomatic of a market dominated by short terms traders, arbs, and hedge fund where the end investor has fled. Expect things to get worse before they get better. By the way, don’t try Googling the word “exposed”. You’d be shocked, shocked.

To see the data, charts, and graphs that support this research piece, as well as more iconoclastic and out-of-consensus analysis, please visit me at www.madhedgefundtrader.com . There, you will find the conventional wisdom mercilessly flailed and tortured daily, and my last two years of research reports available for free. You can also listen to me on Hedge Fund Radio by clicking on “This Week on Hedge Fund Radio” in the upper right corner of my home page.

 

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