X0508 4 2025-08-02 0001842022 DT Midstream, Inc. DTM 0001724472 Slater David 500 WOODWARD AVE., SUITE 2900 DETROIT MI 48226 true true President and CEO false Common Stock 2025-08-02 4 M 0 51950 A 198312 D Common Stock 2025-08-02 4 F 0 23898 105.61 D 174414 D Restricted Stock Units 2025-08-02 4 M 0 43499.5 0 D Common Stock 43499.5 0 D Includes shares of the Issuer's common stock acquired under the Issuer's dividend reinvestment plan. 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. This restricted stock unit vested 25% on August 2, 2023, 25% on August 2, 2024 and 50% on August 2, 2025, subject to the Reporting Person's continued service with the Issuer through the applicable vesting date. /s/ Andrew Hayner, Attorney-in-Fact 2025-08-04