X0508 4 2026-03-05 0001842022 DT Midstream, Inc. DTM 0002087681 Finland Joseph Peter 500 WOODWARD AVE., SUITE 2900 DETROIT MI 48226 true Chief Accounting Officer false Common Stock 2026-03-05 4 M 0 1033 A 2069 D Common Stock 2026-03-05 4 F 0 412 141.77 D 1657 D Restricted Stock Units 2026-03-05 4 M 0 965 0 D Common Stock 965 965 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. 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. /s/ Andrew Hayner, Attorney-in-Fact 2026-03-09