Every other issue of The Validea Hot List newsletter examines in detail one of John Reese’s computerized Guru Strategies. This latest issue looks at the Joseph Piotroski-inspired strategy, which has beaten the market by more than 3 percentage points per year since its inception almost six years ago. Below is an excerpt from today’s newsletter, along with several top-scoring stock ideas based on the Piotroski investment strategy.
Taken from the February 5, 2010 issue of The Validea Hot List
Guru Spotlight: Joseph Piotroski
If you haven’t heard of Joseph Piotroski, you’re not alone. He’s probably the least well-known of the investment “gurus” who inspired my strategies. Actually, he’s not even a professional investor, but instead an accountant and college professor.
In 2000, however, Piotroski showed that you don’t need to be a smooth-talking Wall Street hot-shot to make it big in the market. While teaching at the University of Chicago, he authored a research paper that showed how assessing stocks with simple accounting-based methods could produce excellent returns over the long haul. No fancy formulas, no insider knowledge — just a straightforward assessment of a company’s balance sheet.
His study turned quite a few heads on Wall Street. It focused on companies that had high book/market ratios — i.e. the type of unpopular stocks whose book values (total assets minus total liabilities) were high compared to the value investors ascribed to them (their share price multiplied by their number of shares).
Quite often, such firms have low book/market ratios because they are in financial distress, and investors wisely stay away from them. On certain occasions, however, high book/market firms may be good companies that are being overlooked by investors for one reason or another. These firms can be great investment opportunities, because their stock prices will likely jump once Wall Street realizes it’s been shunning a winner.
Through his research, Piotroski developed a methodology to separate the solid but overlooked high book/market firms from high book/market ratio firms that were in financial distress. He found that this method, which included a number of balance-sheet-based criteria, increased the return of a high book/market investor’s portfolio by at least 7.5 percent annually. In addition, he found that buying the high book/market firms that passed his strategy and shorting those that didn’t would have produced an impressive 23 percent average annual return from 1976 and 1996.
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