X0508 4 2023-09-22 0 0001789832 Hess Midstream LP HESM 0000004447 HESS CORP 1185 AVENUE OF THE AMERICAS NEW YORK NY 10036 1 0 1 0 0001702361 Hess Investments North Dakota LLC 1185 AVENUE OF THE AMERICAS NEW YORK NY 10036 1 0 1 0 0 Class B Shares 2023-09-22 4 J 0 1650710 0.00 D 74905924 I See footnote Class B Shares 11500000 I See footnote Class A Shares 449000 I See footnote Opco Class B Units 2023-09-22 4 D 0 1650710 30.29 D Class A Shares 1650710 86405924 I See footnote Reflects the cancellation for no consideration of Class B Shares in connection with Hess Midstream Operations LP's repurchase of an aggregate 3,301,420 Opco Class B Units from Hess Investments North Dakota LLC ("HINDL) and GIP II Blue Holding, L.P. ("Blue Holding") and a subsequent cancellation of such Opco Class B Units. Reflects holdings following a transaction exempt from reporting pursuant to Rule 16a-13. 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. Hess Infrastructure Partners GP LLC is a 50/50 joint venture between HINDL and Blue Holding. As such, each of the foregoing entities may be deemed to beneficially own the securities held of record by Hess Midstream GP LP. Each such entity disclaims beneficial ownership of such securities except to the extent of their pecuniary interest therein. Represents securities held by HINDL. HINDL is an indirect, wholly owned subsidiary of Hess Corporation, a publicly traded company listed on the New York Stock Exchange. As a result, Hess Corporation may be deemed to beneficially own the securities held of record by HINDL and Hess Midstream GP LP. Hess Corporation disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. The Opco Class B Units may be converted at any time into Class A Shares on a one-to-one basis and have no expiration date. Hess Corporation By: /s/ John P. Rielly, Executive Vice President and Chief Financial Officer 2023-09-22 Hess Investments North Dakota LLC By: /s/ Jonathan C. Stein, Vice President 2023-09-22