0001209191-20-059806.hdr.sgml : 20201120 20201120194743 0001209191-20-059806 4 1 20201119 20201120 20201120 Cassidy William J. 0001501708 4 34 001-34776 201333961 410 - 17TH STREET SUITE 1400 DENVER CO 80202 Oasis Petroleum Inc. 0001486159 1311 000000000 DE 1231 1001 FANNIN STREET SUITE 1500 HOUSTON TX 77002 281-404-9500 1001 FANNIN STREET SUITE 1500 HOUSTON TX 77002