Insiders have taken this recent sell-off to buy some stocks. As you can see on the chart below, they tend to become aggressive on the buy side during market sell-offs, August 2011, and the middle of 2015. This makes all the sense in the world, they are probably seeing bargains in the stocks they know best.
Finviz is a great source to find insider information for free, you use this LINK to see all the latest insider buying info. Insider buying is just a piece of the puzzle and a starting point for more research into the company. $CHK is an interesting one that you will find on the list today, the Chairman bought 2.1 million shares last week in the open market.