DT Midstream Initial Statement of Beneficial Ownership Filed by Garrett Jacob Mehl

Executive Summary

On September 18, 2026, DT Midstream, Inc. (NYSE: DTM) filed a Form 3 Initial Statement of Beneficial Ownership with the SEC on behalf of Garrett Jacob Mehl, who serves as Senior Vice President, Project Execution & Operations. The event date requiring the report occurred on September 14, 2026.

Reported Holdings

• Common Stock (Non-Derivative):
  • 0.241 shares held indirectly through his son (the reporting person disclaims beneficial ownership of these shares).
• Restricted Stock Units (Derivative):
  • 777.314 RSUs: Vesting on February 15, 2027.
  • 405.225 RSUs: Vesting on February 25, 2028.
  • 2,445.840 RSUs: Vesting in installments (815 on March 5, 2027; 815 on March 5, 2028; and 815.840 on March 5, 2029).
  • 645.135 RSUs: Vesting on February 20, 2029.
  • Across all four grants, Mr. Mehl holds 4,273.514 RSUs, each representing the contingent right to receive one share of common stock including dividend equivalents.

Market Impact & Significance

This filing represents standard administrative compliance following an executive appointment or reaching reporting-officer status under Section 16 of the Securities Exchange Act of 1934. Because it discloses existing compensatory equity awards rather than open-market purchases or sales, the trading significance is Low.