UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. 1)*

Zix Corporation

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class of Securities)

98974P100

(CUSIP Number)

December 31, 2021

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐ Rule 13d-1(b)

☒ Rule 13d-1(c)

☐ Rule 13d-1(d)


*		The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP: 98974P100

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CUSIP: 98974P100

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(1)

The common stock of Zix Corporation previously held by Spring Creek Capital, LLC may be deemed to have been beneficially owned by Koch Industries, Inc. (“Koch Industries”) by virtue of Koch Industries’ indirect beneficial ownership of Spring Creek Capital, LLC. Beneficial ownership is presented excluding non-voting preferred equity securities.

CUSIP: 98974P100

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Item

1(a). Name of Issuer: Zix Corporation (the “Issuer”)

Item

1(b). Address of Issuer’s Principal Executive Officers: 2711 North Haskell Avenue, Suite 2300, LB 36, Dallas, TX 75204-2960

Item

2(a). Name of Person Filing:

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”).

Item

2(b). Address or Principal Business Office or, if None, Residence:

The principal business office for all Reporting Persons filing is:

4111 E. 37^th Street North

Wichita, KS 67220

Item

2(c). Citizenship: See Item 4 of each cover page.

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%

(i)

Sole power to vote or to direct the vote: 0

(ii)

Shared power to vote or to direct the vote: 0

(iii)

Sole power to dispose or to direct the disposition of: 0

(iv)

Shared power to dispose or to direct the disposition of: 0

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.

CUSIP: 98974P100

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Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.

Not applicable.

Item 8. Identification and Classification of Members of the Group.

Not applicable.

Item 9. Notice of Dissolution of Group.

Not applicable.

Item 10. Certifications.

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under §240.14a-11.

CUSIP: 98974P100

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After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.


Dated: February 9, 2022


		Spring Creek Capital, LLC

		By:		/s/ Raffaele G. Fazio
		Name:		Raffaele G. Fazio
		Title:		Secretary

		SCC Holdings, LLC

		By:		/s/ Raffaele G. Fazio
		Name: Raffaele G. Fazio
		Title: Secretary

		KIM, LLC

		By:		/s/ Raffaele G. Fazio
		Name: Raffaele G. Fazio
		Title: Vice President and Secretary

		Koch Investments Group, LLC

		By:		/s/ Raffaele G. Fazio
		Name: Raffaele G. Fazio
		Title: Secretary

		Koch Investments Group Holdings, LLC

		By:		/s/ Raffaele G. Fazio
		Name: Raffaele G. Fazio
		Title: Secretary

		Koch Industries, Inc.

		By:		/s/ Raffaele G. Fazio
		Name:		Raffaele G. Fazio
		Title:		Assistant Secretary

NAMES OF REPORTING PERSONS

Spring Creek Capital, LLC

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a) ☐ (b) ☐

SEC USE ONLY

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

ZIX CORP SC 13G/A