Bargain Hunters Take Note: Insider Cluster-Buying At ALPN

A particularly strong insider buying signal is what we call a "cluster-buy" where three or more different insiders make open market purchases within a short period of one another. At Alpine Immune Sciences Inc (ALPN), 5 different insiders purchased 1,317,503 shares at an average price of $5.37/share, for a total of $7.07M, with the most recent purchase on January 18, 2019.