CUSIP: 98974P100
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Item 1(a). Name of Issuer: Zix Corporation (the Issuer)
Item 1(b). Address of Issuers Principal Executive Officers: 2711 North Haskell Avenue, Suite 2300, LB 36, Dallas, TX 75204-2960
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2(a). Name of Person Filing:
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Spring Creek Capital, LLC (Spring Creek)
SCC
Holdings, LLC (SCC Holdings)
Koch Industries, Inc. (Koch Industries)
(Each a Reporting Person, and collectively, the Reporting Persons).
Item 2(b). Address or Principal Business Office or, if None, Residence:
The principal business office for all Reporting Persons filing is:
4111 E. 37th Street North
Wichita, KS 67220
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2(c). Citizenship: See Item 4 of each cover page.
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Item 2(d).Title of Class of Securities: Common Stock, par value $0.01 per share (Public Shares).
Item 2(e).CUSIP No.: 98974P100.
Item 3. If
this Statement is Filed Pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), Check Whether the Person Filing is a: Not applicable.
Item 4. Ownership.
(a) Amount beneficially owned:
See Item 9 of each cover page.
(b) Percent of class: See Item 11 of each cover page. Calculated using 56,790,468 Public Shares outstanding as of the close
of business on November 19, 2021, as reported in the Schedule 14D-9 filed by the Issuer on November 23, 2021.
(c) Number of shares as to which the person has:
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(i)
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Sole power to vote or to direct the vote: See Item 5 of each cover page.
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(ii)
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Shared power to vote or to direct the vote: See Item 6 of each cover page.
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(iii)
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Sole power to dispose or to direct the disposition of: See Item 7 of each cover page.
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(iv)
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Shared power to dispose or to direct the disposition of: See Item 8 of each cover page.
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Spring Creek is 100% owned by SCC Holdings and SCC Holdings is 100% owned by Koch Industries.
Koch Industries and SCC Holdings may be deemed to beneficially own the Public Shares held by Spring Creek by virtue of Koch Industries ownership of SCC
Holdings and SCC Holdings ownership of Spring Creek. The filing of this Schedule 13G shall not be construed as an admission that either SCC Holdings or Koch Industries is, for purposes of Sections 13(d) or 13(g) of the Exchange Act,
the beneficial owner of any Public Shares covered by this Schedule 13G.
Item 5. Ownership of 5 Percent or Less of a Class.
Not applicable.