Delaware The First State Page 1 3676325 8100 Authentication: 204998484 SR# 20244350261 Date: 12-02-24 You may verify this certificate online at corp.delaware.gov/authver.shtml I, JEFFREY W. BULLOCK, SECRETARY OF STATE OF THE STATE OF DELAWARE, DO HEREBY CERTIFY THE ATTACHED IS A TRUE AND CORRECT COPY OF THE CERTIFICATE OF DESIGNATION OF “SUMMIT MIDSTREAM CORPORATION”, FILED IN THIS OFFICE ON THE SECOND DAY OF DECEMBER, A.D. 2024, AT 10:16 O`CLOCK A.M. EXHIBIT 3.1