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 James O’Shaughnessy-inspired strategy, which has averaged 10.8% annualized returns since its inception nearly eight years ago, over a period in which the S&P 500 has returned 4% per year. Below is an excerpt from today’s newsletter, along with several top-scoring stock ideas from the O’Shaughnessy-based investment strategy.
Taken from the April 29, 2011 issue of The Validea Hot List
Guru Spotlight: James O’Shaughnessy
To say that James O’Shaughnessy has written the book on quantitative investing strategies might be an exaggeration — but not much of one. Over the years, O’Shaughnessy has compiled an anthology of research on the historical performance of various stock selection strategies rivaling that of just about anyone. He first published his findings back in 1996, in the first edition of his bestselling What Works on Wall Street, using Standard & Poor’s Compustat database to back-test a myriad of quantitative approaches. He has continued to periodically update his findings since then, and today he also serves as a money manager and the manager of several Canadian mutual funds.
In addition to finding out how certain strategies had performed in terms of returns over the long term, O’Shaughnessy’s study also allowed him to find out how risky or volatile each strategy he examined was. So after looking at all sorts of different approaches, he was thus able to find the one that produced the best risk-adjusted returns — what he called his “United Cornerstone” strategy.
The United Cornerstone approach, the basis for my O’Shaughnessy-based Guru Strategy, is actually a combination of two separate models that O’Shaughnessy tested, one growth-focused and one value-focused. His growth method — “Cornerstone Growth” — produced better returns than his “Cornerstone Value” approach, and was a little more risky. The Cornerstone Value strategy, meanwhile, produced returns that were a bit lower, but with less volatility. Together, they formed an exceptional one-two punch, averaging a compound return of 17.1 percent from 1954 through 1996, easily beating the S&P 500s 11.5 percent compound return during that time while maintaining relatively low levels of risk.
That 5.6 percent spread is enormous when compounded over 42 years: If you’d invested $10,000 using the United Cornerstone approach on the first day of the period covered by O’Shaughnessy’s study, you’d have had almost $7.6 million by the end of 1996 — more than $6.6 million more than you’d have ended up with if you’d invested $10,000 in the S&P for the same period! That seems powerful evidence that stock prices do not — as efficient market believers suggest — move in a “random walk,” but instead, as O’Shaughnessy writes, with a “purposeful stride.”
Let’s start with O’Shaughnessy’s value stock strategy. His Cornerstone Value approach targeted “market leaders” — large, well-known firms with sales well above those of the average company — because he found that these firms’ stocks are considerably less volatile than the broader market. He believed that all investors-even the youngest of the bunch — should hold some value stocks.
To find these firms, O’Shaughnessy required stocks to have a market cap greater than $1 billion, a number of shares outstanding greater than the market mean, and trailing 12-month sales that were at least 1.5 times the market mean.
Size and market position weren’t enough to make a value stock attractive for O’Shaughnessy, however. Another key factor that was a great predictor of a stock’s future, he found, was cash flow. My O’Shaughnessy-based value model calls for companies to have cash flows per share greater than the market average.