Sec Form 3 Filing - KM&T Investment Holdings, LLC @ COMPASS MINERALS INTERNATIONAL INC - 2022-10-18

FORM 3 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 KM&T Investment Holdings, LLC 2. Issuer Name and Ticker or Trading Symbol COMPASS MINERALS INTERNATIONAL INC [ CMP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 4111 E. 37TH STREET NORTH 3. Date of Earliest Transaction (MM/DD/YY) 10/18/2022 (Street) WICHITA, KS67220 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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 7,034,609 D( 1 )

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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other KM&T Investment Holdings, LLC 4111 E. 37TH STREET NORTH WICHITA, KS672 20 X X KOCH INDUSTRIES INC 4111 E. 37TH STREET NORTH WICHITA, KS67220 X X Signatures KM&T Investment Holdings, LLC /s/ Vance Holtzman, Vice President 10/21/2022 Signature of Reporting Person Date Koch Industries, Inc. /s/ Raffaele G. Fazio, Assistant Secretary 10/21/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )KM&T Investment Holdings, LLC ("KM&T Investment") is beneficially owned by Koch Minerals & Trading, LLC ("KM&T "), KM&T is beneficially owned by Koch Solutions, LLC ("Koch Solutions") and Koch Solutions is beneficially owned by Koch Industries, Inc. ("Koch Industries"), in each case by means of ownership of all voting equity instruments. Koch Industries, Koch Solutions and KM&T may be deemed to beneficially own the shares of Common Stock of Compass Minerals International, Inc. (the "Issuer") held by KM&T Investment by virtue of (i) Koch Industries' beneficial ownership of Koch Solutions, (ii) Koch Solutions' beneficial ownership of KM&T and (iii) KM&T's beneficial ownership of KM&T Investment.

Remarks: Pursuant to the Stock Purchase Agreement, dated September 14, 2022, between the Issuer and KM&T, KM&T Investment has the right to designate two directors to the Issuer's board of directors and, therefore, KM&T Investment and Koch Industries may each be deemed a "director by deputization" of the Issuer.

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).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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