Donald Listwin, Director at Calix, holds 807.53K shares in Calix (Ticker: CALX), holds 2.45M shares in Violin Memory Inc (Ticker: VMEMQ), holds 711.64K shares in Great Elm Group (Ticker: GEG). Most recently, Donald Listwin Sold ― shares of Calix on Aug 04, 2023 for an estimated value of 4.32M.