Joseph Peter Finland - 05 Mar 2026 Form 4 Insider Report for DT Midstream, Inc. (DTM)

Role: Chief Accounting Officer
Signature: /s/ Andrew Hayner, Attorney-in-Fact
Issuer symbol: DTM
Transactions as of: 05 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 09 Mar 2026, 16:25:58 UTC
Previous filing: 24 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Finland Joseph Peter	Chief Accounting Officer	500 WOODWARD AVE., SUITE 2900, DETROIT	/s/ Andrew Hayner, Attorney-in-Fact	09 Mar 2026	0002087681

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	DTM	Common Stock	Options Exercise		+1,033	+100%		2,069	05 Mar 2026	Direct	F1, F2
transaction	DTM	Common Stock	Tax liability		-412	-20%	$141.77^*	1,657	05 Mar 2026	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	DTM	Restricted Stock Units	Options Exercise		-965	-50%	$0.000000^*	965	05 Mar 2026	Common Stock	965		Direct	F2, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Includes shares of the Issuer's common stock acquired under the Issuer's dividend reinvestment plan.
F2	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.
F3	Restricted stock units of which 965 vested on March 5, 2026 and 965 vest on March 5, 2027, together with associated dividend equivalents, subject to the Reporting Person's continued employment with the Issuer through the applicable vesting dates.