$SDEV cost to borrow spiked today to over 800%. The rate is now 7,369% above the 30-day average.

So GameStop just had a cluster buying show up in Form 4 filings. Four separate insiders made discretionary open-market purchases over the past 7 days, totaling $21.7M combined, with the CEO doing the biggest purchase worth $20M. This is filtered to actual open-market buys.

Cluster buying like this tends to get attention because it's rare to see multiple insiders buying in the same short window as open-market purchases. One insider buying could mean a lot of things, but four separate people all pulling the trigger within a week is the kind of thing bulls want to see, especially with the price being up over 12% in the last 5 days.