MINNEAPOLIS (Stockpickr) -- Congratulations to those who sold short Aeropostale (ARO) in advance of the company's disappointing earnings report. In that report, the company announced the resignation of its CEO amid a quarter whose results failed to meet expectations.

In addition, guidance for the future was weaker than expected. Shares dropped precipitously, closing down more than 12% the next trading day. The news pretty much confirmed my expectation that the company was lagging fellow teen retailers Zumiez ( ZUMZ) and Hot Topic ( HOTT).

My second pick for the week was Trina Solar ( TSL). There the expectation was for a big pop of the stock on the heels of an upside earnings surprise. Well, we got the upside earnings surprise, but the market reaction was not what was expected.

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In fact, traders long the stock would have been wise to sell with a small loss as the trade went from bad to worse throughout the day. It is hard to explain the harsh reaction Trina's news, especially with oil prices moving higher last week.

Chalk it up to the whims of the market. That happens from time to time, and the best protection is to exit a trade when it goes against you. If you are playing along at home, make your bets and be ready to cash out or cash in accordingly.

This week we have an interesting selection of companies releasing earnings. Last week I mentioned Smith & Wesson ( SWHC). The company moved its earnings release to the forthcoming week. I would trade the stock expecting a disappointing report.

Here are three other names to trade next week:

Casey's General Stores ( CASY - Get Report)

Casey's General Stores operates gas stations and convenience stores across the country. The stock has been on fire this year, gaining some 30% in value. Will the trend continue with this week's earnings report?

Convenience store sales at higher profit margins have been propelling earnings growth during the recession. Consumers looking for convenience agree to pay a bit more in order to avoid extra trips to the grocery store.

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Analysts expect the company to post a profit of 77 cents. That number has held steady for most of the last quarter. In the year-ago period, the company beat estimates by 6 cents. The recent history suggests another earnings beat is in order. Will that be enough to keep a floor under the stock or better?

There is trouble brewing for Casey's that I would be concerned about in advance of earnings. Oil prices have been on the rise. Will that dampen the outlook for the future?

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I think so. I would look for Casey's to sell off even if the company beats estimates. It will be the future guidance that dictates where this trade goes, and I expect the company to be cautious in that regard.

National Semiconductor ( NSM)

The semiconductor business is in the midst of a bull cycle. The growth of smart phones and personal computing devices out of the last recession has allowed stocks in the industry to appreciate smartly.

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Fueling those returns are earnings reports that are meeting or beating expectations. This week, National Semiconductor steps to the plate with its report. Will we see a beat-the-number moment?

Last week a brokerage firm increased its rating of NSM, which could foreshadow more gains to come. Analysts expect NSM to make 32 cents in the period ending Nov. 30. Over the last year, the company has bested estimates by multiple pennies. Despite the beats, shares of NSM have actually lost value since the start of 2010.

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A stronger economy and a bull market should help shares when the company reports on Thursday. I expect the company to beat by at least 3 cents. Shares should jump as a result.

Costco ( COST - Get Report)

Earlier this year I was a big basher of Costco. I expected more from the company in 2009 given its wholesale business model and a more cost-conscious consumer. I thought things should be going a whole lot better for the company.

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This year the company is firing on all cylinders, finally taking advantage of a favorable market. Shares of Costco are up some 20% this year on the strength of solid month-to-month sales growth and a strengthening economy.

Analysts currently expect Costco to make 69 cents in the quarter ending Nov. 30. That is an improvement of 2 cents on the estimate 90 days ago. Given the monthly sales number, I expect Costco to beat current expectations, but I am not certain that will be enough to provide a boost to the stock.

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The key for Costco longs will be future guidance. There I expect the company to provide positive news in the wake of a strong early holiday buying season. Although Costco shares are a bit pricey at the moment, I would trade this week's earnings report to the upside.

For a daily list of stocks announcing earnings the following day, check out the Earnings Announcements portfolio on Stockpickr.

-- Written by Jamie Dlugosch in Minneapolis.

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At the time of publication, author had no positions in stocks mentioned.

Jamie Dlugosch is a founder and contributor to MainStreet Investor and MainStreet Accredited Investor. Formerly, he was president and CEO of Al Frank Asset Management. He has contributed editorially to The Rational Investor, The Prudent Speculator, Penny Stock Winners and InvestorPlace Media.