It's time to take the pulse of the market, where we look at the top 50 insiders buying and selling shares over the past 30 days starting on Oct. 8 -- with all data from Insider Monitor.

The past 30 days were heavily tilted toward insider selling of stock, with five times more sold than bought. The top holdings being sold were Seagate Technology (NASDAQ:STX), Western Digital (NASDAQ:WDC), and Antero Resources, which alone accounted for nearly 40% of the $10.2 billion of stock sold during the period. On the other side of the coin, key insiders at Davita, General Growth Properties, and Gold Inc. have bought nearly $1.8 billioin worth of stock, accounting for 69% of all insider buying during the time period.

In the following video, Motley Fool analyst Blake Bos discusses the recent transactions and what was driving some of the buying and selling in these companies. He'll break down total buying and selling over the past two months and let investors know whether they should interpret the huge amounts of insider selling as a sign of a looming market collapse or disregard it as noise.

Insider Buying and Selling Chart

Insider Selling Table

Insider Buying Table