X0306 4 2019-12-16 0 0001789832 Hess Midstream LP HESM 0001797016 Hess Infrastructure Partners GP LLC 1501 MCKINNEY STREET HOUSTON TX 77010 1 0 1 0 0001797015 Hess Midstream GP LLC 1501 MCKINNEY STREET HOUSTON TX 77010 1 0 1 0 0001797014 Hess Midstream GP LP 1501 MCKINNEY STREET HOUSTON TX 77010 1 0 1 0 Class A Shares 2019-12-16 4 A 0 898000 A 898000 I See Note Class B Shares 2019-12-16 4 A 0 266416928 A 266416928 I See Note Pursuant to the Agreement and Plan of Merger dated October 3, 2019 (the "Merger Agreement"), each Common Unit of Hess Midstream Partners LP ("Old HESM")held by the Reporting Persons prior to the effective time of the transactions contemplated by the Merger Agreement (the "Effective Time) were exchanged for 898,000 Class A Shares and 266,416,928 Class B Shares of Hess Midstream LP ("New HESM"). Represents securities held by Hess Midstream GP LP. Hess Infrastructure Partners GP LLC is the sole member of Hess Midstream GP LLC which is the general partner of Hess Midstream GP LP. As such, each of the foregoing entities may be deemed to beneficially own the securities held of record by Hess Midstream GP LP. Hess Infrastructure Partners GP LLC By: Barry Schachter 2019-12-17 Hess Midstream GP LLC By: Barry Schachter 2019-12-17 Hess Midstream GP LP, by Hess Midstream GP LLC, its general partner By: Barry Schachter 2019-12-17