X0306 4 2021-12-23 1 0000855612 ZIX CORP ZIXI 0001488288 Miller Maribess L 2711 N. HASKELL AVENUE SUITE 2300 DALLAS TX 75204 1 0 0 0 Common Stock 2021-12-08 4 M 0 15408 3.61 A 128451 D Common Stock 2021-12-23 4 D 0 73613 8.50 D 55838 D Deferred Stock Units 2021-12-23 4 D 0 55838 8.50 D 0 D Common Stock Options 3.61 2021-12-08 4 M 0 15408 0.00 D 2026-02-17 Common Stock 15408 0 D On December 23, 2021, the Issuer was acquired by Open Text Corporation ("Parent") pursuant to the Agreement and Plan of Merger (the "Agreement"), dated as of November 7, 2021, by and among Parent, Issuer and Zeta Merger Sub Inc. (the "Merger"). At the effective time of the Merger (the "Effective Time"), each outstanding share of Issuer common stock (subject to limited exceptions) converted into the right to receive $8.50 in cash, without interest. Pursuant to the Agreement and the letter agreement, dated December 18, 2021 between the Issuer and Parent (the "Letter Agreement"), each Company Stock-Based Award (as defined in the Letter Agreement) outstanding as of immediately prior to the Effective Time was cancelled and converted into a right to receive an amount of cash equal to the Company Stock-Based Award Consideration (as defined in the Letter Agreement) and each Company Option (as defined in the Letter Agreement) outstanding as of immediately prior to the Effective Time was cancelled and converted into a right to receive an amount of cash equal to the Option Consideration (as defined in the Letter Agreement), payable in accordance with and subject to the terms of the Letter Agreement. Includes shares granted under the 2018 Omnibus Incentive Plan (the "2018 Plan"). The restricted stock would vest pro-rata and quarterly over one year, and subject to acceleration under conditions described in the 2018 Plan. Granted under the Amended and Restated 2012 Incentive Plan (as amended, the "2012 Plan"). The options would vest pro rata and quarterly over one year, and subject to acceleration under conditions described in the 2012 Plan. /s/ Maribess L. Miller 2021-12-28