Why settle for ordinary quarterly reports?

Every week I take a look at three companies that beat market expectations, since I believe that it's the biggest factor in a stock beating the market. Leaving Wall Street's pros with puzzled looks on their faces can be a good thing. It usually means that the companies have more in the tank than analysts figured. Capital appreciation often follows.

Let's take a look at a few companies that humbled the prognosticators over the past few trading days.

We can start with Amazon.com (NASDAQ:AMZN). Shares of the world's leading online retailer soared 27% on Friday, after the e-tailer obliterated Wall Street predictions. The pros expected third-quarter earnings to rise 22%. Instead, Amazon.com's net income catapulted 68% higher, to $0.45 a share.

T. Rowe Price (NASDAQ:TROW) also made out nicely. The mutual fund giant posted a profit of $0.50 a share, comfortably ahead of analyst estimates of $0.46 a share. It's true that T. Rowe Price earned more a year ago, but the fund operator feels that the worst is behind it; it grew its asset base nicely during the quarter's rally. T. Rowe's showing was a welcome surprise after rival Janus Capital Group (NYSE:JNS) simply met expectations a day earlier.

Finally, we have Yahoo! (NASDAQ:YHOO) checking in higher. The company's quarterly profit of $0.13 a share -- or $0.15 a share on a non-GAAP basis -- blew past Mr. Market's best guess of $0.07 a share. The online advertising market may not be hitting on all cylinders, but it bears pointing out that its three largest players -- Google (NASDAQ:GOOG), Yahoo!, and Microsoft (NASDAQ:MSFT) -- all surpassed Wall Street's bottom-line projections.

So keep watching the companies that surpass expectations. Over time, it will be a profitable experience for investors, as the market rewards the overachievers. That's the kind of surprise we look for in the Motley Fool Rule Breakers newsletter service. Want in? Check out a 30-day trial subscription.

Either way, come back next Monday to learn about more stocks that blew the market away.