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 online photo shop Shutterfly (Nasdaq: SFLY) jumped 10% today after being knocked down on an analyst's comments earlier this week.

So what: Shutterfly director James White just bought 35,000 shares on Wednesday when the stock sank, which is generally a bullish sign. This overcame Jim Cramer's "sell, sell, sell" advice during his lightning round yesterday, which can often affect trading in small stocks for a short time.  

Now what: Insider buying is generally a great sign for a company because insiders know what's really going on inside a company. They far more often sell because they're invested in options or restricted stock, so a flat-out buy is usually a good sign. With that said, I'm not going to jump on a stock that's trading at 32 times forward earnings in a very competitive market.

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