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 backs 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 140,000 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.

To fully capture the upside potential of those highly rated stocks, it makes sense to identify them just as soon as they are upgraded to four- and 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 four-star status from three 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

Maxim Integrated Products, Inc.(OTC BB: MXIM)

257 of 279

Avnet, Inc. (NYSE:AVT)

166 of 179

Wolverine World Wide, Inc. (NYSE:WWW)

132 of 142

The Kroger Co. (NYSE:KR)

544 of 601

iShares MSCI Emerging Markets Indx (ETF) (NYSE:EEM)

917 of 972

NewMarket Corp (NYSE:NEU)

207 of 214

Data from Motley Fool CAPS, September 2, 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.