DT Midstream, Inc. — Proxy Solicitation & Information Statement 2026

Mar 26, 2026

DEFA14A 1 ny20058512x2_defa14a.htm DEFA14A Licensed to: Broadridge Financial Solutions, Inc. Document created using Broadridge PROfile 26.3.2.5342 Copyright 1995 - 2026 Broadridge Begin Page 1

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities

Exchange Act of 1934 (Amendment No. )

☒ Filed by the Registrant

☐ Filed by a Party other than the Registrant

Check the appropriate box:

☐	​	​	Preliminary Proxy Statement
☐	​	​	Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
☐	​	​	Definitive Proxy Statement
☒	​	​	Definitive Additional Materials
☐	​	​	Soliciting Material Pursuant to §240.14a-12

DT MIDSTREAM, INC.

(Name of Registrant as Specified in Its Charter)

(Name of Person(s) Filing Proxy Statement, if Other than the Registrant)

Payment of Filing Fee (Check the appropriate box): — ☒	​	​	No fee required.
☐	​	​	Fee paid previously with preliminary materials.
☐	​	​	Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

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