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 130,000 members, we've found that five-star stocks, as a group, substantially outperform the broader market -- to the tune of 12 percentage points on an annualized basis from November 2006 to July 2008.

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

Martek Biosciences Corp. (NASDAQ:MATK)

348 of 362

Elbit Systems Ltd. (ADR) (NASDAQ:ESLT)

210 of 215

PICO Holdings, Inc. (NASDAQ:PICO)

268 of 280

The Clorox Company (NYSE:CLX)

396 of 420

American Reprographics Company (NYSE:ARP)

603 of 632

Daktronics, Inc. (NASDAQ:DAKT)

414 of 446

Braskem S.A. (ADR) (NYSE:BAK)

278 of 289

Data from Motley Fool CAPS, March 10, 2009.

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