Green Mountain Coffee Roasters Shares Plunged: What You Need to Know

Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Rule Breaker pick Green Mountain Coffee Roasters (NAS: GMCR) are switching to decaf this morning, getting hammered by as much as 14% today with little reprieve as renowned hedge fund manager David Einhorn made negative comments about the company at the Value Investing Congress in New York.

So what: Einhorn, president of Greenlight Capital, has shorted the K-cup maker for a variety of reasons, including a "litany of accounting questions," outpaced capital expenditures, and "looming patent issues." In addition, Whitney Tilson, who made headlines with his public bearish debate with Netflix (NAS: NFLX) CEO Reed Hastings earlier in the year, has come out and disclosed he is also short Green Mountain shares.

Now what: Green Mountain has been on a streak for the past couple years, and if you bought in when this stock was first recommended by our Rule Breakers team, you'd be sitting on an 818% winner. Einhorn believes that the company's earnings are "too good to be true." Whenever you have a stock that has a run like this and skeptics pop up, it's always good to check your initial investment thesis and see if it still holds. Einhorn is known for capitalizing on the financial crisis -- he was short a handful of financials, including Lehman Brothers -- so his statements are bound to draw a lot of attention.

Interested in more info on Green Mountain Coffee Roasters? Add it to your watchlist byclicking here.

At the time thisarticle was published Fool contributorEvan Niuholds no position in any company mentioned.Click hereto see his holdings and a short bio.Motley Fool newsletter serviceshave recommended buying shares of Green Mountain Coffee Roasters and Netflix.Motley Fool newsletter serviceshave recommended creating a lurking gator position in Green Mountain Coffee Roasters. Try any of our Foolish newsletter servicesfree for 30 days. We Fools may not all hold the same opinions, but we all believe thatconsidering a diverse range of insightsmakes us better investors. The Motley Fool has adisclosure policy.

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