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As the saying goes, there are many possible reasons for an insider to sell a stock, but only one reason to buy -- they expect to make money. So let's look at two noteworthy recent insider buys.

On Monday, Calumet Specialty Product Partners' CFO, David West Griffin, made a $26,371 buy of CLMT, purchasing 6,369 shares at a cost of $4.14 each. Griffin was up about 19.6% on the buy at the high point of today's trading session, with CLMT trading as high as $4.95 in trading on Friday. Calumet Specialty Product Partners is trading down about 1.9% on the day Friday. Before this latest buy, Griffin bought CLMT on 6 other occasions during the past year, for a total cost of $124,773 at an average of $4.16 per share.

And at York Water, there was insider buying on Monday, by CEO and President Jeffrey R. Hines who bought 170 shares at a cost of $33.32 each, for a total investment of $5,665. Before this latest buy, Hines purchased YORW on 5 other occasions during the past twelve months, for a total cost of $42,578 at an average of $35.16 per share. York Water is trading up about 1.4% on the day Friday. Hines was up about 8.8% on the buy at the high point of today's trading session, with YORW trading as high as $36.25 in trading on Friday.

For MarketNewsVideo.com, I'm Sayoko Murase.