X0306 4 2019-12-16 1 0001619739 Hess Midstream Partners LP HESM 0001552830 Global Infrastructure Investors II, LLC 1345 AVENUE OF THE AMERICAS, 30TH FLOOR NEW YORK NY 10105 1 0 1 0 0001552829 Global Infrastructure GP II, L.P. 1345 AVENUE OF THE AMERICAS, 30TH FLOOR NEW YORK NY 10105 1 0 1 0 0001702754 GIP Blue Holding GP, LLC 1345 AVENUE OF THE AMERICAS, 30TH FLOOR NEW YORK NY 10105 1 0 1 0 0001701926 GIP II Blue Holding Partnership, L.P. 1345 AVENUE OF THE AMERICAS, 30TH FLOOR NEW YORK NY 10105 1 0 1 0 Common Units 2019-12-16 4 D 0 5141327 D 0 I See footnote Subordinated Units 2019-12-16 4 D 0 13639827 D Common Units 13639827 0 I See footnote Pursuant to the Agreement and Plan of Merger dated October 3, 2019 (the "Merger Agreement"), each Common Unit and Subordinated 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, 266,416,928 Class B Shares and 133,208,464 Opco Class B Units of Hess Midstream LP ("New HESM"). The securities reported herein are held by GIP II Blue Holding Partnership, L.P. ("Blue Holding"). Global Infrastructure Investors II, LLC ("Global Investors") is the sole general partner of Global Infrastructure GP II, L.P. ("Global GP"), which is the sole member of GIP Blue Holding GP, LLC, ("Blue Holding GP"), which is the general partner of Blue Holding. As such, each of Global Investors, Global GP and Blue Holding GP may be deemed to beneficially own the securities held of record by Blue Holding. Each such entity disclaims beneficial ownership of such securities except to the extent of their pecuniary interest therein. Global Infrastructure Investors II, LLC, By: /s/ Mark Levitt, Secretary 2019-12-17 Global Infrastructure GP II, L.P., By: Global Infrastructure Investors II, LLC, its general partner, By: /s/ Mark Levitt, Secretary 2019-12-17 GIP Blue Holding GP, LLC, By: /s/ Mark Levitt, Secretary 2019-12-17 GIP II Blue Holding Partnership, L.P., By: GIP Blue Holding GP, LLC, its general partner, By: /s/ Mark Levitt, Secretary 2019-12-17