Sadly, there's no such thing as an ultimate buy signal when it comes to investing in stocks. Identifying companies with the wind at their back takes time, patience, and a good dose of due diligence.

There is, however, an easy way to increase your odds of finding the stocks that will beat the market. At Motley Fool CAPS, the Fool's investing community of more than 135,000 members, we've found that our "five-star portfolio" is up 15.31% between January 2007 and April 2009, compared to a loss of 40.6% for the S&P 500.

In order to fully capture the upside potential of those five-star stocks, it makes sense to identify them just as soon as they achieve five-star status. Fortunately, our CAPS screener now makes it possible to do this. Below, for example, is a list of companies that have been upgraded to five-star status from four stars just yesterday. These stock ideas are only a starting point, of course. Be sure to join us on CAPS to dig in even further.

Company

All-Stars Saying Outperform

CREDO Petroleum Corp (NASDAQ:CRED)

224 of 236

Olympic Steel, Inc. (NASDAQ:ZEUS)

251 of 264

North American Energy Partners, Inc.(USA) (NYSE:NOA)

195 of 201

Cemex S.A. B de C.V. (ADR) (NYSE:CX)

4369 of 4507

Martek Biosciences Corp. (NASDAQ:MATK)

351 of 366

Nestle SA Reg Shs. Ser. B Spons (ADR)(OTC BB: NSRGY)

213 of 218

Medicis Pharmaceutical Corp (NYSE:MRX)

199 of 214

Data from Motley Fool CAPS, July 29, 2009

Come join us on CAPS, absolutely free, to learn more about these and countless other interesting stock ideas.

No individual person selected the stocks in this article, so there is no author to disclose an interest in them. Since this article was automatically generated by identifying the stocks loved both by the CAPS community and by buyers in today’s market, it is possible that Motley Fool personnel (and even The Motley Fool itself, through our Million Dollar Portfolio, Motley Fool Pro, and Ready Made Millionaire services), have positions in these stocks. We thought you'd like to know that. You can learn more about The Motley Fool’s disclosure policy here.