X0306 4 2020-02-28 0 0001652133 Oasis Midstream Partners LP OMP 0001494083 Lou Michael H 1001 FANNIN STREET SUITE 1500 HOUSTON TX 77002 1 1 0 0 President Phantom Units 2020-02-28 4 M 0 4240 0.00 D Common units representing limited partnership interests 4240 14940 D Each Phantom Unit is the economic equivalent of one common unit representing a limited partner interest of Oasis Midstream Partners LP (the "Partnership"). An award of 12,720 cash-settled Phantom Units was granted to the reporting person on January 17, 2019. The Phantom Units generally vest in three equal installments on the first business day following the date on which the Partnership makes a distribution for the quarters ending on each of December 31, 2019, 2020, and 2021 subject to continued employment through each such vesting date. The first installment of Phantom Units vested on February 28, 2020. /s/ Nickolas J. Lorentzatos, as attorney-in-fact 2020-03-03