Common Contracts

7,500,000 Common Units Representing Limited Partner Interests OASIS MIDSTREAM PARTNERS LP UNDERWRITING AGREEMENT September 20, 2017

Underwriting Agreement • September 22nd, 2017 • Oasis Midstream Partners LP • Drilling oil & gas wells • New York

• Contract Type
  Underwriting Agreement
• Filed
  September 22nd, 2017
• Company
  Oasis Midstream Partners LP
• Industry
  Drilling oil & gas wells
• Jurisdiction
  New York

The undersigned understands that Morgan Stanley & Co. (the “Representative”) proposes to enter into an Underwriting Agreement (the “Underwriting Agreement”) with Oasis Midstream Partners LP, a Delaware limited partnership (the “Partnership”), providing for the public offering (the “Public Offering”) by the several Underwriters, including the Representative (the “Underwriters”), of 7,500,000 common units representing limited partner interests in the Partnership (the “Common Units”).

•] Common Units Representing Limited Partner Interests OASIS MIDSTREAM PARTNERS LP FORM OF UNDERWRITING AGREEMENT

Underwriting Agreement • June 2nd, 2017 • Oasis Midstream Partners LP • Drilling oil & gas wells • New York

• Contract Type
  Underwriting Agreement
• Filed
  June 2nd, 2017
• Company
  Oasis Midstream Partners LP
• Industry
  Drilling oil & gas wells
• Jurisdiction
  New York

The undersigned understands that Morgan Stanley & Co. (the “Representative”) proposes to enter into an Underwriting Agreement (the “Underwriting Agreement”) with Oasis Midstream Partners LP, a Delaware limited partnership (the “Partnership”), providing for the public offering (the “Public Offering”) by the several Underwriters, including the Representative (the “Underwriters”), of [•] common units representing limited partner interests in the Partnership (the “Common Units”).