X0306 4 2010-06-17 0 0001486159 Oasis Petroleum Inc. OAS 0001494075 Nusz Thomas B 1001 FANNIN ST, STE 1500 HOUSTON TX 77002 1 1 0 0 Chairman and CEO Common Stock 2020-10-02 4 S 0 942607 0.20 D 937834 D Common Stock 2020-10-06 4 S 0 6535 0.18 D 931299 D Common Stock 2020-10-05 4 S 0 98607 0.18 D 0 I By Amalaya Investments, LLC Common Stock 2010-06-17 4 P 0 5700 14.00 A 5700 I By Elizabeth R. Nusz Living Trust Common Stock 2020-10-06 4 S 0 5700 0.18 D 0 I by Elizabeth R. Nusz Living Trust Represents weighted average price of open market same day sales. Sales of shares took place at actual prices ranging from $0.18 to $0.22 per share. Full information regarding the number of shares sold at each separate price will be provided upon request by the Commission staff, Oasis Petroleum Inc. ("Oasis") or an Oasis shareholder. The Reporting Person is the Managing Member of Amalaya Investments, LLC, which is controlled by the Reporting Person and his wife. The Reporting Person is a joint-trustee of Elizabeth R. Nusz Living Trust (the "Trust") and shares investment control over the Trust's assets with the other joint-trustee. The Reporting Person is neither a grantor nor a beneficiary of the Trust and does not have the ability to revoke the Trust or amend its governing documents. The Trust acquired 5,700 shares of the Common Stock of Oasis in connection with Oasis's initial public offering. /s/ Nickolas J. Lorentzatos, as attorney-in-fact 2020-10-06