CUSIP: 98974P100
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1(a). Name of Issuer: Zix Corporation (the “Issuer”)
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1(b). Address of Issuer’s 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”)
KIM, LLC (“KIM”)
Koch Investments Group, LLC (“KIG”)
Koch Investments
Group Holdings, LLC (“KIGH”)
Koch Industries, Inc. (“Koch Industries”)
(Each a “Reporting Person,” and collectively, the “Reporting Persons”).
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2(b). Address or Principal Business Office or, if None, Residence:
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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: 0%
(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: 0
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(ii)
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Shared power to vote or to direct the vote: 0
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(iii)
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Sole power to dispose or to direct the disposition of: 0
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(iv)
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Shared power to dispose or to direct the disposition of: 0
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Item 5. Ownership of 5 Percent or Less of a Class.
If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than
5 percent of the class of securities, check the following [x].
Item 6. Ownership of More than 5 Percent on Behalf of Another Person.
Not applicable.