X0306 4 2018-02-26 0 0000855612 ZIX CORP ZIXI 0001232607 BONNEY MARK J 2711 N. HASKELL AVENUE SUITE 2200 DALLAS TX 75204 1 0 0 0 Deferred Stock Units 2018-02-26 4 A 0 16337 0.00 A Common Stock 16337 16337 D Each deferred stock unit represents a contingent right to receive one share of ZIXI common stock. Grant under the Amended and Restated 2012 Incentive Plan (as amended, the "Plan"). The deferred stock units will vest pro-rata and quarterly over one year, and subject to acceleration under conditions described in the Plan. Delivery of the underlying shares in respect of vesting will occur pursuant to the underlying award agreement. /s/ Justin K. Ferguson, Attorney-in-Fact 2018-02-28