Sec Form 3 Filing - Cox Melissa @ DT Midstream, Inc. - 2022-05-06

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 Cox Melissa 2. Issuer Name and Ticker or Trading Symbol DT Midstream, Inc. [ DTM] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Sr. VP Admin. (Last) (First) (Middle) 500 WOODWARD AVE, SUITE 2900 3. Date of Earliest Transaction (MM/DD/YY) 05/06/2022 (Street) DETROIT, MI48226 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 1,025 D Common Stock 358.766 I By 401(k) Plan

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 Restricted Stock Units( 1 ) ( 4 ) ( 2 ) ( 2 ) Common Stock 512.86( 3 ) D Restricted Stock Units( 1 ) ( 4 ) ( 5 ) ( 5 ) Common Stock 512.86( 3 ) D Restricted Stock Units ( 4 ) ( 6 ) ( 6 ) Common Stock 4,503.86( 3 ) D Restricted Stock Units ( 4 ) ( 7 ) ( 7 ) Common Stock 529.86( 3 ) D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Cox Melissa 500 WOODWARD AVE SUITE 2900 DETROIT, MI48226 Sr. VP Admin. Signatures /s/ Andrew T. Hayner, Attorney-in-Fact 05/13/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Pursuant to the Employee Matters Agreement dated as of June 25, 2021 between DTE Energy Company and the Issuer, the Reporting Person received restricted stock units of the Issuer to replace restricted stock and restricted stock units held by the Reporting Person immediately before the legal and structural separation of the Issuer from DTE Energy Company (the "Spin-off") that were granted to the Reporting Person pursuant to an equity plan of DTE Energy Company and were forfeited in connection with the Spin-off. ( 2 )This restricted stock unit will vest on January 29, 2023, subject to the Reporting Person's continued employment with the Issuer through the applicable vesting date. ( 3 )Includes shares of the Issuer's common stock acquired under the Issuer's dividend reinvestment plan. ( 4 )Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock with any fractional shares being paid in cash. ( 5 )This restricted stock unit will vest on January 27, 2024, subject to the Reporting Persons' continued employment with the Issuer through the applicable vesting date. ( 6 )This restricted stock unit will vest 25% on August 2, 2023, 25% on August 2, 2024 and 50% on August 2, 2025, subject to the Reporting Person's continued employment with the Issuer through the applicable vesting date. ( 7 )This restricted stock unit will vest on February 4, 2025, subject to the Reporting Person's continued employment with the Issuer through the applicable vesting date.

Remarks: Exhibit 24 - Power of Attorney

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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