X0306 4 2021-10-08 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 B Shares 2021-10-08 4 J 0 8625000 0.00 D 219641928 I See footnote Class A Shares 898000 I See footnote Reflects the cancellation for no consideration of Class B Shares in connection with the conversion of the Opco Class B Units into Class A Shares. 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: Jonathan C. Stein, Chief Financial Officer 2021-10-12 Hess Midstream GP LLC By: Jonathan C. Stein, Chief Financial Officer 2021-10-12 Hess Midstream GP LP, by Hess Midstream GP LLC its general partner By: Jonathan C. Stein, Chief Financial Officer 2021-10-12