X0206 3 2019-12-16 1 0001789832 Hess Midstream 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 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