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, Cannae Holdings' Executive Vice President, Michael L.

Gravelle, made a $250,012 buy of CNNE, purchasing 6,667 shares at a cost of $37.50 each.

Cannae Holdings is trading down about 0.8% on the day Thursday.

Before this latest buy, Gravelle made one other buy in the past twelve months, purchasing $99,990 shares at a cost of $33.00 each.

And at Cryo-cell, there was insider buying on Monday, by Co-Chief Executive Officer David Portnoy who purchased 30,297 shares at a cost of $7.94 each, for a trade totaling $240,464.

Cryo-cell is trading up about 2.3% on the day Thursday.

Portnoy was up about 6.4% on the purchase at the high point of today's trading session, with CCEL trading as high as $8.45 in trading on Thursday.