X0306 4 2019-11-25 0 0000855612 ZIX CORP ZIXI 0001188811 ROBERTSON DAVE 2711 N. HASKELL AVENUE SUITE 2200, LB 36 DALLAS TX 75204 0 1 0 0 Vice President Common Stock 2019-11-25 4 M 0 50828 2.05 A 288096 D Common Stock 2019-11-25 4 S 0 50828 7.4061 D 237268 D Common Stock 2019-11-26 4 M 0 29172 2.05 A 266440 D Common Stock 2019-11-26 4 S 0 29172 7.397 D 237268 D Common Stock Options 2.05 2010-02-18 4 M 0 50828 0.00 D 2020-02-17 Common Stock 50828 209172 D Common Stock Options 2.05 2010-02-18 4 M 0 29172 0.00 D 2020-02-17 Common Stock 29172 180000 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.37 to $7.46, inclusive. The reporting person undertakes to provide to Zix Corporation, any security holder of Zix Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within such range. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.35 to $7.43, inclusive. The reporting person undertakes to provide to Zix Corporation, any security holder of Zix Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within such range. Grant of 80,000 options on February 18, 2010. These options expire February 17, 2020. /s/ Noah F. Webster, Attorney-in-Fact 2019-11-27