Sec Form 4 Filing - Di Leo John P. @ ZIX CORP - 2021-12-23

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Di Leo John P. 2. Issuer Name and Ticker or Trading Symbol ZIX CORP [ ZIXI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Revenue Officer (Last) (First) (Middle) 2711 N. HASKELL AVENUE, SUITE 2300 3. Date of Earliest Transaction (MM/DD/YY) 12/23/2021 (Street) DALLAS, TX75204 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 12/16/2021 M 43,750 A $ 8.03 239,691 D Common Stock 12/23/2021 D 239,691( 5 ) D $ 8.5( 1 )( 3 ) 0 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Common Stock Options $ 8.03 12/16/2021 M 43,750 ( 6 ) 03/04/2030 Common Stock 43,750 $ 0 82,139 D Restricted Stock Units ( 2 ) 12/23/2021 D 82,139 ( 4 ) ( 4 ) Common Stock 82,139 ( 3 ) 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Di Leo John P. 2711 N. HASKELL AVENUE SUITE 2300 DALLAS, TX75204 Chief Revenue Officer Signatures /s/ John Di Leo 12/28/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )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. ( 2 )Each restricted stock unit would convert into a share of common stock on a one-for-one basis. ( 3 )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. ( 4 )Granted under the 2018 Omnibus Incentive Plan (the "2018 Plan"). The restricted stock would vest pro-rata and annually over 3 years, and subject to acceleration under conditions described in the 2018 Plan. ( 5 )Includes shares granted under the 2018 Plan consisting of restricted stock. A portion of such shares would vest based on the Issuer's achievement of specific financial performance criteria and are subject to acceleration under conditions described in the 2018 Plan. ( 6 )Granted under the 2018 Plan. Options would vest pro-rata and quarterly over four years, and subject to accelerated vesting upon the occurrence of stated events.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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