OMP / Oasis Midstream Partners LP - Unit - SEC Filings, Annual Report, Proxy Statement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File Number: 001-38212 CRESTWOOD MIDSTREAM PARTNERS LP (as successor in interest to Oasi

As filed with the Securities and Exchange Commission on February 17, 2022.

S-8 POS 1 d291897ds8pos.htm S-8 POS As filed with the Securities and Exchange Commission on February 17, 2022. Registration No. 333-220627 Registration No. 333-227174 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-220627 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-227174

As filed with the Securities and Exchange Commission on February 17, 2022.

As filed with the Securities and Exchange Commission on February 17, 2022. Registration No. 333-220627 Registration No. 333-227174 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-220627 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-227174 UNDER THE SECURITIES ACT OF 1933 OA

OMP / Oasis Midstream Partners LP / Oasis Petroleum Inc. - SC 13D/A Activist Investment

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No.

First Supplemental Indenture, dated as of February 1, 2022, among Crestwood Midstream Partners LP, Crestwood Midstream Finance Corp., the guarantors named therein and Regions Bank.

Exhibit 4.1 Execution Version FIRST SUPPLEMENTAL INDENTURE FIRST SUPPLEMENTAL INDENTURE (this ?Supplemental Indenture?) to the Indenture (as defined below), dated as of February 1, 2022, among (i) Crestwood Midstream Partners LP (the ?Company?), a Delaware limited partnership and the successor to Oasis Midstream Partners LP (?OMP?), a Delaware limited partnership, (ii) Crestwood Midstream Finance

Master Amendment to Commercial Agreements, dated as of February 1, 2022, by and among Oasis Petroleum North America LLC, Oasis Petroleum Marketing LLC, Oasis Midstream Services LLC, Oasis Midstream Partners LP, OMP Operating LLC, and Bighorn DevCo LLC.

Exhibit 10.1 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THIS EXHIBIT BECAUSE IT IS BOTH NOT MATERIAL AND IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. REDACTED INFORMATION INDICATED BY [***]. MASTER AMENDMENT TO COMMERCIAL AGREEMENTS This MASTER AMENDMENT TO COMMERCIAL AGREEMENTS (this ?Amendment?) is made and entered into effective as of February 1, 2022 (the ?Effe

Regulation FD Disclosure, Changes in Control of Registrant, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Entry into a Material Definitive Agreement, Termination of a Material Definitive Agreement, Material Modification to Rights of Security Holders, Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Completion of Acquisition or Disposition of Assets

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 31, 2022 OASIS MIDSTREAM PARTNERS LP (Exact Name of Registrant as Specified in its Charter) Delaware 001-38212 20-1647837 (State or Other Jurisdiction of Incorporation) (Commi

Crestwood Completes Acquisition of Oasis Midstream

Exhibit 99.1 News Release CRESTWOOD EQUITY PARTNERS LP 811 Main Street, Suite 3400 Houston, TX 77002 www.crestwoodlp.com Crestwood Completes Acquisition of Oasis Midstream HOUSTON, TEXAS ? February 1, 2022 ? Crestwood Equity Partners LP (NYSE: CEQP) (?Crestwood?) and Oasis Midstream Partners LP (?Oasis Midstream?) announced today that the companies have successfully closed the transactions contemp

First Amendment to the Second Amended and Restated Agreement of Limited Partnership of Oasis Midstream Partners LP, dated as of January 31, 2022.

Exhibit 3.1 FIRST AMENDMENT TO SECOND AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP OF OASIS MIDSTREAM PARTNERS LP This First Amendment (this ?Amendment?) to the SECOND AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP OF OASIS MIDSTREAM PARTNERS LP, a Delaware limited partnership (the ?Partnership?), given effect beginning January 1, 2021 (the ?Partnership Agreement?), is entered into

Other Events, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 29, 2022 OASIS MIDSTREAM PARTNERS LP (Exact Name of Registrant as Specified in its Charter) Delaware 001-38212 47-1208855 (State or Other Jurisdiction of Incorporation) (Commi

Crestwood Announces Quarterly Distribution and Schedules Fourth Quarter 2021 Earnings Release Date

Filed by: Crestwood Equity Partners LP Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14d-2(b) and Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Oasis Midstream Partners LP Commission File Number: 001-38212 News Release CRESTWOOD EQUITY PARTNERS LP 811 Main Street, Suite 3400 Houston, TX 77002 www.

OMP / Oasis Midstream Partners LP / Oasis Petroleum Inc. - SC 13D/A Activist Investment

SC 13D/A 1 d252607dsc13da.htm SC 13D/A SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 6) Oasis Midstream Partners LP (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 67420T 206 (CUSIP Number) Nickolas J. Lorentzatos 1001 Fannin Street, Suite 1500, Houston TX 77002 Tel:

OASIS INVESTMENT HOLDINGS LLC AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT Dated as of December 29, 2021

EX-99.M Exhibit M Execution Version OASIS INVESTMENT HOLDINGS LLC AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT Dated as of December 29, 2021 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND CONSTRUCTION 1 Section 1.1 Definitions 1 Section 1.2 Construction 10 ARTICLE II BUSINESS PURPOSE AND TERM OF THE COMPANY 11 Section 2.1 Formation 11 Section 2.2 Name 11 Section 2.3 Registered Office

Joint Filing Agreement January 3, 2022

EX-99.A Exhibit A Joint Filing Agreement January 3, 2022 This will confirm the agreement by and among all the undersigned that the Statement on Schedule 13D filed on or about this date and any further amendments thereto with respect to the beneficial ownership by the undersigned of the common units of Oasis Midstream Partners LP, a Delaware limited partnership (the “Issuer”), and such other securi

CONTRIBUTION AGREEMENT

EX-99.L Exhibit L Execution Version CONTRIBUTION AGREEMENT This Contribution Agreement (this “Agreement”), dated as of December 29, 2021 (the “Effective Date”), is entered into by and between OMS Holdings LLC, a Delaware limited liability company (“OMS Holdings”) and Oasis Investment Holdings LLC, a Delaware limited liability company (“Oasis Investment Holdings”). OMS Holdings and Oasis Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defi

Filed by Oasis Midstream Partners LP

Filed by Oasis Midstream Partners LP Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Oasis Midstream Partners LP Commission File No.

AMENDED AND RESTATED CRUDE OIL GATHERING AND STORAGE AGREEMENT BY AND AMONG OASIS PETROLEUM NORTH AMERICA LLC, OASIS PETROLEUM MARKETING LLC, OMP OPERATING LLC DATED AS OF OCTOBER 25, 2021 BUT EFFECTIVE FOR ALL PURPOSES AS OF OCTOBER 5, 2021 PAINTED

[Certain identified information has been excluded from this exhibit because it is both not material and is the type that the registrant treats as private or confidential.

AMENDED AND RESTATED PRODUCED AND FLOWBACK WATER GATHERING AND DISPOSAL AGREEMENT BY AND AMONG OASIS PETROLEUM NORTH AMERICA LLC, OMP OPERATING LLC DATED AS OF OCTOBER 25, 2021 BUT EFFECTIVE FOR ALL PURPOSES AS OF OCTOBER 5, 2021 PAINTED WOODS/ CITY

[Certain identified information has been excluded from this exhibit because it is both not material and is the type that the registrant treats as private or confidential.

PRODUCED AND FLOWBACK WATER GATHERING AND DISPOSAL AGREEMENT BY AND AMONG OASIS PETROLEUM NORTH AMERICA LLC, OMP OPERATING LLC DATED AS OF October 5, 2021 CITY OF WILLISTON TABLE OF CONTENTS

[Certain identified information has been excluded from this exhibit because it is both not material and is the type that the registrant treats as private or confidential.

21.1 (a)

Exhibit 21.1 List of Subsidiaries of Oasis Midstream Partners LP Name of Subsidiary Jurisdiction of Incorporation or Organization OMP Operating LLC Delaware Bighorn DevCo LLC Delaware Bobcat DevCo LLC Delaware Beartooth DevCo LLC Delaware Panther DevCo LLC Delaware OMP DevCo Holdings Corp Delaware OMP Finance Corp Delaware

CRUDE OIL GATHERING AND STORAGE AGREEMENT BY AND AMONG OASIS PETROLEUM NORTH AMERICA LLC, OASIS PETROLEUM MARKETING LLC, OMP OPERATING LLC DATED AS OF October 5, 2021 CITY OF WILLISTON TABLE OF CONTENTS

[Certain identified information has been excluded from this exhibit because it is both not material and is the type that the registrant treats as private or confidential.

AMENDMENT #2 TO TRANSPORTATION SERVICES AGREEMENT

[Certain identified information has been excluded from this exhibit because it is both not material and is the type that the registrant treats as private or confidential.

GAS GATHERING, COMPRESSION AND PROCESSING AGREEMENT BY AND AMONG OASIS PETROLEUM NORTH AMERICA LLC, OASIS PETROLEUM MARKETING LLC, OMP OPERATING LLC DATED AS OF OCTOBER 25, 2021 PAINTED WOODS / CITY OF WILLISTON TABLE OF CONTENTS

[Certain identified information has been excluded from this exhibit because it is both not material and is the type that the registrant treats as private or confidential.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 ☐ TRANSITION REPORT PURSUANT

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-3821

OMP / Oasis Midstream Partners LP / Oasis Petroleum Inc. - SC 13D/A Activist Investment

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No.

Agreement and Plan of Merger, dated as of October 25, 2021, by and among Oasis Midstream Partners LP, OMP GP LLC, Crestwood Equity Partners LP, Project Phantom Merger Sub LLC, Project Falcon Merger Sub LLC, and, solely for the purposes of Section 2.1(a)(i) thereof, Crestwood Equity GP LLC.

Exhibit 2.1 AGREEMENT AND PLAN OF MERGER by and among CRESTWOOD EQUITY PARTNERS LP, PROJECT FALCON MERGER SUB LLC, PROJECT PHANTOM MERGER SUB LLC, OASIS MIDSTREAM PARTNERS LP, OMP GP LLC, AND, SOLELY FOR PURPOSES OF SECTION 2.1(a)(i), CRESTWOOD EQUITY GP LLC Dated as of October 25, 2021 i TABLE OF CONTENTS ARTICLE I. THE MERGERS 2 Section 1.1 Pre-Closing Transactions; The Mergers. 2 Section 1.2 Th

Support Agreement, dated as of October 25, 2021, by and among Crestwood Equity Partners LP, Oasis Midstream Partners LP, OMP GP LLC, Oasis Petroleum Inc. and OMS Holdings LLC.

Exhibit 10.1 Execution SUPPORT AGREEMENT THIS SUPPORT AGREEMENT, dated as of October 25, 2021 (this ?Agreement?), is entered into by and among Crestwood Equity Partners LP, a Delaware limited partnership (?Parent?), Oasis Midstream Partners LP, a Delaware limited partnership (the ?Partnership?), Oasis Petroleum Inc., a Delaware corporation (the ?Sponsor?), OMP GP LLC, a Delaware limited liability

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 25, 2021 OASIS MIDSTREAM

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 25, 2021 OASIS MIDSTREAM PARTNERS LP (Exact Name of Registrant as Specified in its Charter) Delaware 001-38212 47-1208855 (State or Other Jurisdiction of Incorporation) (Commi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 25, 2021 OASIS PETROLEUM

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 25, 2021 OASIS PETROLEUM INC. (Exact name of registrant as specified in its charter) Delaware 001-34776 80-0554627 (State or other jurisdiction of incorporation) (Commission F

Support Agreement, dated as of October 25, 2021, by and among Crestwood Equity Partners LP, Oasis Midstream Partners LP, OMP GP LLC, Oasis Petroleum Inc. and OMS Holdings LLC.

Exhibit 10.1 SUPPORT AGREEMENT THIS SUPPORT AGREEMENT, dated as of October 25, 2021 (this ?Agreement?), is entered into by and among Crestwood Equity Partners LP, a Delaware limited partnership (?Parent?), Oasis Midstream Partners LP, a Delaware limited partnership (the ?Partnership?), Oasis Petroleum Inc., a Delaware corporation (the ?Sponsor?), OMP GP LLC, a Delaware limited liability company an

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 25, 2021 OASIS MIDSTREAM PARTNERS LP (Exact Name of Registrant as Specified in its Charter) Delaware 001-38212 47-1208855 (State or Other Jurisdiction of Incorporation) (Commi

Agreement and Plan of Merger, dated as of October 25, 2021, by and among Oasis Midstream Partners LP, OMP GP LLC, Crestwood Equity Partners LP, Project Phantom Merger Sub LLC, Project Falcon Merger Sub LLC, and, solely for the purposes of Section 2.1(a)(i) thereof, Crestwood Equity GP LLC.

Exhibit 2.1 AGREEMENT AND PLAN OF MERGER by and among CRESTWOOD EQUITY PARTNERS LP, PROJECT FALCON MERGER SUB LLC, PROJECT PHANTOM MERGER SUB LLC, OASIS MIDSTREAM PARTNERS LP, OMP GP LLC, AND, SOLELY FOR PURPOSES OF SECTION 2.1(a)(i), CRESTWOOD EQUITY GP LLC Dated as of October 25, 2021 i TABLE OF CONTENTS ARTICLE I. THE MERGERS 2 Section 1.1 Pre-Closing Transactions; The Mergers. 2 Section 1.2 Th

Oasis Petroleum Inc. (OAS) Business Update Conference Call October 26, 2021, 10:00 a.m. ET

Filed by Oasis Petroleum Inc. Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Oasis Midstream Partners LP Commission File No.: 001-38212 The following communication is being filed in connection with the proposed merger of Crestwood Equity Partners LP (?Crestwood?) and Oasis Midstream Partners LP (?O

Support Agreement, dated as of October 25, 2021, by and among Crestwood Equity Partners LP, Oasis Midstream Partners LP, OMP GP LLC, Oasis Petroleum Inc. and OMS Holdings LLC.

Exhibit 10.1 SUPPORT AGREEMENT THIS SUPPORT AGREEMENT, dated as of October 25, 2021 (this ?Agreement?), is entered into by and among Crestwood Equity Partners LP, a Delaware limited partnership (?Parent?), Oasis Midstream Partners LP, a Delaware limited partnership (the ?Partnership?), Oasis Petroleum Inc., a Delaware corporation (the ?Sponsor?), OMP GP LLC, a Delaware limited liability company an

Agreement and Plan of Merger, dated as of October 25, 2021, by and among Oasis Midstream Partners LP, OMP GP LLC, Crestwood Equity Partners LP, Project Falcon Merger Sub LLC, Project Phantom Merger Sub LLC, and, solely for the purposes of Section 2.1(a)(i) thereof, Crestwood Equity GP LLC.

Exhibit 2.1 Execution Version AGREEMENT AND PLAN OF MERGER by and among CRESTWOOD EQUITY PARTNERS LP, PROJECT FALCON MERGER SUB LLC, PROJECT PHANTOM MERGER SUB LLC, OASIS MIDSTREAM PARTNERS LP, OMP GP LLC, AND, SOLELY FOR PURPOSES OF SECTION 2.1(a)(i), CRESTWOOD EQUITY GP LLC Dated as of October 25, 2021 - i - TABLE OF CONTENTS ARTICLE I. THE MERGERS 2 Section 1.1 Pre-Closing Transactions; The Mer

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): October 25, 2021 CRESTWOOD EQUITY

425 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): October 25, 2021 CRESTWOOD EQUITY PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-34664 43-1918951 (State or Other Jurisdiction of Incorporation or

Support Agreement, dated as of October 25, 2021, by and among Crestwood Equity Partners LP, Oasis Midstream Partners LP, OMP GP LLC, Oasis Petroleum Inc. and OMS Holdings LLC.

Exhibit 10.1 SUPPORT AGREEMENT THIS SUPPORT AGREEMENT, dated as of October 25, 2021 (this ?Agreement?), is entered into by and among Crestwood Equity Partners LP, a Delaware limited partnership (?Parent?), Oasis Midstream Partners LP, a Delaware limited partnership (the ?Partnership?), Oasis Petroleum Inc., a Delaware corporation (the ?Sponsor?), OMP GP LLC, a Delaware limited liability company an

Agreement and Plan of Merger, dated as of October 25, 2021, by and among Oasis Midstream Partners LP, OMP GP LLC, Crestwood Equity Partners LP, Project Phantom Merger Sub LLC, Project Falcon Merger Sub LLC, and, solely for the purposes of Section 2.1(a)(i) thereof, Crestwood Equity GP LLC.

Exhibit 2.1 AGREEMENT AND PLAN OF MERGER by and among CRESTWOOD EQUITY PARTNERS LP, PROJECT FALCON MERGER SUB LLC, PROJECT PHANTOM MERGER SUB LLC, OASIS MIDSTREAM PARTNERS LP, OMP GP LLC, AND, SOLELY FOR PURPOSES OF SECTION 2.1(a)(i), CRESTWOOD EQUITY GP LLC Dated as of October 25, 2021 i TABLE OF CONTENTS ARTICLE I. THE MERGERS 2 Section 1.1 Pre-Closing Transactions; The Mergers. 2 Section 1.2 Th

Oasis Petroleum Inc. (OAS) Business Update Conference Call October 26, 2021, 10:00 a.m. ET

Filed by Oasis Petroleum Inc. Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Oasis Midstream Partners LP Commission File No.: 001-38212 Oasis Petroleum Inc. (OAS) Business Update Conference Call October 26, 2021, 10:00 a.m. ET Executives: Michael Lou, Chief Financial Officer Danny Brown, Chief Exec

Filed by: Crestwood Equity Partners LP

Filed by: Crestwood Equity Partners LP Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14d-2(b) and Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Oasis Midstream Partners LP Commission File Number: 001-38212 The following communication is being filed in connection with the proposed merger of Crestwood Equity Partners LP (?Crestwood?) and Oasis Midstream Partners LP (?Oasis Midstream?).

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Filed by: Crestwood Equity Partners LP Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14d-2(b) and Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Oasis Midstream Partners LP Commission File Number: 001-38212 Dear Crestwood Employees, Today, we are pleased to announce that Crestwood will acquire Oasis Midstream Partners, a premier gathering and processing company, in a $1.

Company Information Crestwood Equity Partners LP Contact Information NYSE Ticker CEQP Corporate Headquarters Investor Relations (1,2) Market Capitalization ($MM) $1,907 811 Main Street [email protected] (2) Suite 3400 (713) 380-3081 E

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 25, 2021 OASIS MIDSTREAM

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 25, 2021 OASIS MIDSTREAM PARTNERS LP (Exact Name of Registrant as Specified in its Charter) Delaware 001-38212 47-1208855 (State or Other Jurisdiction of Incorporation) (Commi

Oasis Midstream Partners Declares Third Quarter 2021 Distribution

Exhibit 99.1 Oasis Midstream Partners Declares Third Quarter 2021 Distribution HOUSTON, Oct. 26, 2021 /PRNewswire/ ? Oasis Midstream Partners LP (NASDAQ: OMP) (?OMP? or the ?Partnership?) today announced that, on October 25, 2021, the Board of Directors of OMP GP LLC (the ?General Partner?) declared the quarterly cash distribution for the third quarter of 2021 of $0.56 per unit, payable on Novembe

Forward-Looking / Cautionary Statements Non-GAAP Financial Measures E&P Adjusted Gas Revenue, Cash GPT, E&P GPT, E&P Cash G&A, Cash Interest, E&P Cash Interest, Adjusted EBITDA, Adjusted EBITDA attributable to Oasis, E&P Adjusted EBITDA, E&P Free Cas

A New Tomorrow, Today October 2021 Building a Stronger, More Sustainable Oasis: Transformational Actions to Enhance Shareholder Value Exhibit 99.

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 25, 2021 OASIS MIDSTREAM PARTNERS LP (Exact Name of Registrant as Specified in its Charter) Delaware 001-38212 47-1208855 (State or Other Jurisdiction of Incorporation) (Commi

Crestwood to Acquire Oasis Midstream Partners in $1.8 Billion Transaction Highly complementary Williston Basin and Delaware Basin assets enhance Crestwood’s competitive positioning in its core growth basins Significantly expands Crestwood’s leading p

Exhibit 99.2 News Release CRESTWOOD EQUITY PARTNERS LP 811 Main Street, Suite 3400 Houston, TX 77002 www.crestwoodlp.com Crestwood to Acquire Oasis Midstream Partners in $1.8 Billion Transaction Highly complementary Williston Basin and Delaware Basin assets enhance Crestwood?s competitive positioning in its core growth basins Significantly expands Crestwood?s leading position in the Williston Basi

Oasis Midstream Partners Declares Third Quarter 2021 Distribution

Exhibit 99.1 Oasis Midstream Partners Declares Third Quarter 2021 Distribution HOUSTON, Oct. 26, 2021 /PRNewswire/ ? Oasis Midstream Partners LP (NASDAQ: OMP) (?OMP? or the ?Partnership?) today announced that, on October 25, 2021, the Board of Directors of OMP GP LLC (the ?General Partner?) declared the quarterly cash distribution for the third quarter of 2021 of $0.56 per unit, payable on Novembe

1

Filed by: Crestwood Equity Partners LP Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14d-2(b) and Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Oasis Midstream Partners LP Commission File Number: 001-38212 The following communication is being filed in connection with the proposed merger of Crestwood Equity Partners LP (?Crestwood?) and Oasis Midstream Partners LP (?Oasis Midstream?).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 26, 2021 CRESTWOOD EQUITY

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 26, 2021 CRESTWOOD EQUITY PARTNERS LP (Exact name of Registrant as specified in its charter) DELAWARE 001-34664 43-1918951 (State of incorporation or organization) (Commission

1

Filed by: Crestwood Equity Partners LP Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14d-2(b) and Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Oasis Midstream Partners LP Commission File Number: 001-38212 The following communication is being filed in connection with the proposed merger of Crestwood Equity Partners LP (?Crestwood?) and Oasis Midstream Partners LP (?Oasis Midstream?).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 25, 2021 OASIS PETROLEUM

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 25, 2021 OASIS PETROLEUM INC. (Exact name of registrant as specified in its charter) Delaware 001-34776 80-0554627 (State or other jurisdiction of incorporation) (Commission F

Crestwood to Acquire Oasis Midstream Partners in $1.8 Billion Transaction Highly complementary Williston Basin and Delaware Basin assets enhance Crestwood’s competitive positioning in its core growth basins Significantly expands Crestwood’s leading p

Exhibit 99.2 News Release CRESTWOOD EQUITY PARTNERS LP 811 Main Street, Suite 3400 Houston, TX 77002 www.crestwoodlp.com Crestwood to Acquire Oasis Midstream Partners in $1.8 Billion Transaction Highly complementary Williston Basin and Delaware Basin assets enhance Crestwood?s competitive positioning in its core growth basins Significantly expands Crestwood?s leading position in the Williston Basi

Crestwood to Acquire Oasis Midstream Partners in $1.8 Billion Highly complementary Williston Basin and Delaware Basin assets enhance Crestwood’s competitive positioning in its core growth basins Significantly expands Crestwood’s leading position in t

Exhibit 99.2 News Release CRESTWOOD EQUITY PARTNERS LP 811 Main Street, Suite 3400 Houston, TX 77002 www.crestwoodlp.com Crestwood to Acquire Oasis Midstream Partners in $1.8 Billion Transaction Highly complementary Williston Basin and Delaware Basin assets enhance Crestwood?s competitive positioning in its core growth basins Significantly expands Crestwood?s leading position in the Williston Basi

Oasis Petroleum Inc. Announces Oasis Midstream Partners to Merge with Crestwood Equity Partners Provides Financial and Operational Update and Increases Dividend by 33%

Exhibit 99.1 Oasis Petroleum Inc. Announces Oasis Midstream Partners to Merge with Crestwood Equity Partners Provides Financial and Operational Update and Increases Dividend by 33% HOUSTON, Oct. 26, 2021 /PRNewswire/ ? Oasis Petroleum Inc. (NASDAQ: OAS) (?Oasis? or the ?Company?) announced today that Oasis Midstream Partners (NASDAQ: OMP) (?OMP?) has entered into a definitive agreement under which

Filed by: Crestwood Equity Partners LP Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14d-2(b) and Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Oasis Midstream Partners LP ™ ™ ™ ™ ™ ™

Filed by: Crestwood Equity Partners LP Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14d-2(b) and Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Oasis Midstream Partners LP ™ ™ ™ ™ ™ ™ Commission File Number: 001-38212 ™ ™ ™ ™ ™ ™ Connections for Connections for Connections for Connections for Connections for Connections for America

Crestwood Announces Third Quarter 2021 Financial and Operating Results Favorable commodity prices and strong operational performance in the G&P segment delivers third quarter 2021 net loss of $39.6 million, Adjusted EBITDA of $139.9 million, and dist

Exhibit 99.1 News Release CRESTWOOD EQUITY PARTNERS LP 811 Main Street, Suite 3400 Houston, TX 77002 www.crestwoodlp.com Crestwood Announces Third Quarter 2021 Financial and Operating Results Favorable commodity prices and strong operational performance in the G&P segment delivers third quarter 2021 net loss of $39.6 million, Adjusted EBITDA of $139.9 million, and distributable cash flow to common

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 5, 2021 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organ

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 24, 2021 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or or

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 ☐ TRANSITION REPORT PURSUANT TO S

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-38212 Oas

21.1 (a)

Exhibit 21.1 List of Subsidiaries of Oasis Midstream Partners LP Name of Subsidiary Jurisdiction of Incorporation or Organization OMP Operating LLC Delaware Bighorn DevCo LLC Delaware Bobcat DevCo LLC Delaware Beartooth DevCo LLC Delaware Panther DevCo LLC Delaware OMP DevCo Holdings Corp Delaware OMP Finance Corp Delaware

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 3, 2021 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organi

Oasis Midstream Partners LP Announces Second Quarter 2021 Results, Increases Distribution and Updates Outlook

EX-99.1 2 omp-q22021pressreleaseex.htm EX-99.1 Exhibit 99.1 Oasis Midstream Partners LP Announces Second Quarter 2021 Results, Increases Distribution and Updates Outlook Houston, Texas — August 3, 2021 — Oasis Midstream Partners LP (NASDAQ: OMP) (“OMP” or the “Partnership”) today announced financial and operating results for the second quarter of 2021, declared its second quarter 2021 distribution

OMP / Oasis Midstream Partners LP / Oasis Petroleum Inc. - SC 13D AMENDMENT NO. 4 Activist Investment

SC 13D Amendment No. 4 SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 4) Oasis Midstream Partners LP (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 67420T 206 (CUSIP Number) Nickolas J. Lorentzatos 1001 Fannin Street, Suite 1500, Houston TX 77002 Tel: (281) 404-9500 (

Oasis Midstream Partners LP Announces Public Offering of Common Units

Oasis Midstream Partners LP Announces Public Offering of Common Units HOUSTON, TX, June 24, 2021 ? Oasis Midstream Partners LP (NASDAQ: OMP) (the ?Partnership?) announced today that it has commenced an underwritten public offering of 3,623,188 common units representing limited partnership interests (?common units?).

Common Units Representing Limited Partner Interests

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-227647 PROSPECTUS SUPPLEMENT (To Prospectus dated October 26, 2018) 3,623,188 Common Units Representing Limited Partner Interests We are offering 3,623,188 common units representing limited partner interests in Oasis Midstream Partners LP. Our common units trade on the Nasdaq Stock Market LLC (?Nasdaq?) under the symbol ?OMP.?

3,623,188 Common Units Representing Limited Partner Interests OASIS MIDSTREAM PARTNERS LP UNDERWRITING AGREEMENT June 24, 2021

Exhibit 1.1 3,623,188 Common Units Representing Limited Partner Interests OASIS MIDSTREAM PARTNERS LP UNDERWRITING AGREEMENT June 24, 2021 June 24, 2021 Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 Ladies and Gentlemen: Oasis Midstream Partners LP (the ?Partnership?), a Delaware limited partnership, proposes to issue and sell to the several Underwriters named in Schedule I heret

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 24, 2021 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organiz

Common Units Representing Limited Partner Interests

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-227647 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitt

21.1 (a)

Exhibit 21.1 List of Subsidiaries of Oasis Midstream Partners LP Name of Subsidiary Jurisdiction of Incorporation or Organization OMP Operating LLC Delaware Bighorn DevCo LLC Delaware Bobcat DevCo LLC Delaware Beartooth DevCo LLC Delaware Panther DevCo LLC Delaware OMP DevCo Holdings Corp Delaware OMP Finance Corp Delaware

BOBCAT DEVCO LLC THIRD AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT Dated as of March 30, 2021 TABLE OF CONTENTS

Execution Version BOBCAT DEVCO LLC THIRD AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT Dated as of March 30, 2021 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND CONSTRUCTION 2 Section 1.

BEARTOOTH DEVCO LLC THIRD AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT Dated as of March 30, 2021 TABLE OF CONTENTS

Execution Version BEARTOOTH DEVCO LLC THIRD AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT Dated as of March 30, 2021 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND CONSTRUCTION 2 Section 1.

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-38212 Oa

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 3, 2021 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organizat

Oasis Midstream Partners LP Announces First Quarter 2021 Results, Increases Distribution and Updates 2021 Outlook

Exhibit 99.1 Oasis Midstream Partners LP Announces First Quarter 2021 Results, Increases Distribution and Updates 2021 Outlook Houston, Texas ? May 3, 2021 ? Oasis Midstream Partners LP (NASDAQ: OMP) (?OMP? or the ?Partnership?) today announced financial and operating results for the first quarter of 2021, declared its first quarter 2021 distribution and updated its 2021 outlook. 1Q21 Operational

Oasis Midstream Partners Announces Appointment of Daniel E. Brown to Board of Directors

Oasis Midstream Partners Announces Appointment of Daniel E. Brown to Board of Directors HOUSTON, April 14, 2021 /PRNewswire/ - Oasis Midstream Partners LP (NYSE: OMP) (the "Partnership" or "OMP") today announced that Daniel E. Brown, Oasis’ Chief Executive Officer, has been elected to serve on the board of directors of the general partner of OMP, and he is expected to be elected by the board of di

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 13, 2021 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organi

INDEMNIFICATION AGREEMENT

EX-99.2 3 omp-indemnificationagreeme.htm EX-99.2 Execution Version INDEMNIFICATION AGREEMENT INDEMNIFICATION AGREEMENT (this “Agreement”), made and executed as of April 13, 20221 by and between Oasis Midstream Partners LP, a Delaware limited partnership (the “Partnership”) and Daniel E. Brown, an individual resident of the State of Texas (the “Indemnitee”). WITNESSETH: WHEREAS, the Partnership is

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Completion of Acquisition or Disposition of Assets

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 26, 2021 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organi

Oasis Midstream Partners LP Announces Pricing of $450 Million Inaugural Senior Notes Offering

Oasis Midstream Partners LP Announces Pricing of $450 Million Inaugural Senior Notes Offering HOUSTON, March 26, 2021 /PRNewswire/ - Oasis Midstream Partners LP (Nasdaq: OMP) (the ?Partnership? or ?OMP?) announced today the pricing of its private placement to eligible purchasers of $450 million in aggregate principal amount of 8.

SUPPLEMENT TO INCENTIVE UNIT AWARD AGREEMENT

Final Form SUPPLEMENT TO INCENTIVE UNIT AWARD AGREEMENT This Supplement to Incentive Unit Award Agreement (this ?Supplement?) is executed and agreed to as of March [], 2021, by and between OMP GP LLC, a Delaware limited liability company (the ?Company?), and [] (the ?Grantee?).

UNAUDITED PRO FORMA CONDENSED CONSOLIDATED FINANCIAL INFORMATION

EXHIBIT 99.3 UNAUDITED PRO FORMA CONDENSED CONSOLIDATED FINANCIAL INFORMATION The following unaudited pro forma condensed consolidated financial information is derived from the historical consolidated financial statements of Oasis Midstream Partners LP (the ?Partnership? or ?OMP?) and has been adjusted to reflect the following transactions, in accordance with Article 11 of Regulation S-X of the Ex

$450,000,000 OASIS MIDSTREAM PARTNERS LP OMP FINANCE CORP. 8.000% Senior Notes due 2029 Purchase Agreement

Execution Version $450,000,000 OASIS MIDSTREAM PARTNERS LP OMP FINANCE CORP. 8.000% Senior Notes due 2029 Purchase Agreement March 26, 2021 Citigroup Global Markets Inc., as Representative of the several Initial Purchasers listed in Schedule 1 hereto c/o Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Ladies and Gentlemen: Oasis Midstream Partners LP, a Delaware limited

SECOND AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP OF OASIS MIDSTREAM PARTNERS LP

SECOND AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP OF OASIS MIDSTREAM PARTNERS LP US 7827961v.

SECOND AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OMP GP LLC TABLE OF CONTENTS

Execution Version SECOND AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF OMP GP LLC TABLE OF CONTENTS ARTICLE I DEFINITIONS 2 Section 1.

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 3) Oasis Midstream Partners LP (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Secur

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No.

Indenture, dated as of March 30, 2021, by and among Oasis Midstream Partners LP, as issuer, OMP Finance Corp., as co-issuer, OMP Operating LLC, OMP DevCo Holdings Corp., Beartooth DevCo LLC, Bighorn DevCo LLC, Bobcat DevCo LLC, and Panther DevCo LLC, as guarantors, and Regions Bank, as trustee (incorporated by reference to Exhibit 4.1 to Oasis Midstream Partners LP’s Current Report on Form 8-K filed on April 1, 2021).

OASIS MIDSTREAM PARTNERS LP, OMP FINANCE CORP. AND EACH OF THE GUARANTORS PARTY HERETO 8.000% SENIOR NOTES DUE 2029 INDENTURE Dated as of March 30, 2021 REGIONS BANK Trustee TABLE OF CONTENTS Page ARTICLE 1 DEFINITIONS AND INCORPORATION BY REFERENCE Section 1.01 Definitions. 1 Section 1.02 Other Definitions. 31 Section 1.03 Limited Incorporation by Reference of Trust Indenture Act. 31 Section 1.04

Oasis Midstream Partners Completes Acquisition of Midstream Interests from Oasis Petroleum and IDR Elimination

Oasis Midstream Partners Completes Acquisition of Midstream Interests from Oasis Petroleum and IDR Elimination HOUSTON, TX.

Oasis Midstream Partners LP Announces $450 Million Inaugural Senior Notes Offering

Oasis Midstream Partners LP Announces $450 Million Inaugural Senior Notes Offering Houston, Texas ? March 22, 2021 ? Oasis Midstream Partners LP (Nasdaq: OMP) (the ?Partnership? or ?OMP?) announced today that, subject to market conditions, it and its wholly-owned subsidiary, OMP Finance Corp.

Oasismidstream.com Nasdaq: OMP March 2021 Responsibly Transporting our Natural Resources Oasismidstream.com Nasdaq: OMP Forward-Looking / Cautionary Statements This presentation is for informational purposes only and is not an offer to sell securitie

Oasismidstream.com Nasdaq: OMP March 2021 Responsibly Transporting our Natural Resources Oasismidstream.com Nasdaq: OMP Forward-Looking / Cautionary Statements This presentation is for informational purposes only and is not an offer to sell securities or a solicitation of an offer to buy any securities, and may not be relied upon in connection with the purchase or sale of any security. This presen

Fourth Amendment Credit Agreement Dated as of March 22, 2021 Oasis Midstream Partners LP, as Parent, OMP Operating LLC, as Borrower, The Guarantors, Wells Fargo Bank, N.A., as Administrative Agent and Issuing Bank, The Lenders Party Hereto FOURTH AME

Execution Version Fourth Amendment To Credit Agreement Dated as of March 22, 2021 among Oasis Midstream Partners LP, as Parent, OMP Operating LLC, as Borrower, The Guarantors, Wells Fargo Bank, N.

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 22, 2021 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organi

CONTRIBUTION AND SIMPLIFICATION AGREEMENT dated as of March 22, 2021 by and among OMS HOLDINGS LLC, OASIS MIDSTREAM SERVICES LLC, OMP GP LLC, OASIS MIDSTREAM PARTNERS LP, OMP OPERATING LLC, OMP DEVCO HOLDINGS CORP., BEARTOOTH DEVCO LLC, BOBCAT DEVCO

EXECUTION VERSION CONTRIBUTION AND SIMPLIFICATION AGREEMENT dated as of March 22, 2021 by and among OMS HOLDINGS LLC, OASIS MIDSTREAM SERVICES LLC, OMP GP LLC, OASIS MIDSTREAM PARTNERS LP, OMP OPERATING LLC, OMP DEVCO HOLDINGS CORP.

Oasis Midstream Partners Announces Acquisition of Midstream Interests from Oasis Petroleum and IDR Elimination

Oasis Midstream Partners Announces Acquisition of Midstream Interests from Oasis Petroleum and IDR Elimination Houston, Texas ? March 22, 2021 ? Oasis Midstream Partners LP (Nasdaq: OMP) (the ?Partnership? or ?OMP?) today announced it has entered into a contribution and simplification agreement to acquire all remaining interests in Bobcat DevCo LLC (?Bobcat DevCo?) and Beartooth DevCo LLC (?Beartooth DevCo?) from Oasis Petroleum Inc.

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 2) Oasis Midstream Partners LP (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Secur

SC 13D/A 1 d113752dsc13da.htm SC 13D AMENDMENT NO. 2 SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 2) Oasis Midstream Partners LP (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 67420T 206 (CUSIP Number) Nickolas J. Lorentzatos 1001 Fannin Street, Suite 1500, Houston

Annual Report - 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-38212 Oasis M

List of Subsidiaries of Oasis Midstream Partners LP

Exhibit 21.1 List of Subsidiaries of Oasis Midstream Partners LP Name of Subsidiary Jurisdiction of Incorporation or Organization OMP Operating LLC Delaware Bighorn DevCo LLC Delaware Bobcat DevCo LLC Delaware Beartooth DevCo LLC Delaware Panther DevCo LLC Delaware

Oasis Midstream Partners LP Announces Year Ended December 31, 2020 Earnings and Declares Fourth Quarter Distribution of $0.54/unit

Exhibit 99.1 Oasis Midstream Partners LP Announces Year Ended December 31, 2020 Earnings and Declares Fourth Quarter Distribution of $0.54/unit Houston, Texas ? February 24, 2021 ? Oasis Midstream Partners LP (Nasdaq: OMP) (the ?Partnership? or ?OMP?) today announced financial results for the quarter and year ended December 31, 2020 and updated its 2021 outlook. 2020 Highlights: ?Net income was $6

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 24, 2021 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or org

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 22, 2020 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or org

Oasis Midstream Partners Announces Retirement of Thomas Nusz and Appointment of Douglas E. Brooks to Board of Directors

Oasis Midstream Partners Announces Retirement of Thomas Nusz and Appointment of Douglas E.

INDEMNIFICATION AGREEMENT

Execution Version INDEMNIFICATION AGREEMENT INDEMNIFICATION AGREEMENT (this “Agreement”), made and executed as of December 22, 2020 by and between Oasis Midstream Partners LP, a Delaware limited partnership (the “Partnership”) and Douglas E.

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-3821

Oasis Midstream Partners LP Announces Quarter Ended September 30, 2020 Earnings

Exhibit 99.1 Oasis Midstream Partners LP Announces Quarter Ended September 30, 2020 Earnings Houston, Texas — November 3, 2020 — Oasis Midstream Partners LP (Nasdaq: OMP) (“OMP” or the “Partnership”) today announced financial and operating results for the third quarter of 2020. Third Quarter 2020 Highlights •Declared the quarterly cash distribution of $0.54 per unit. •Net income was $43.7 million

Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 3, 2020 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or orga

FIRST AMENDMENT AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OMP GP LLC September 29, 2020

FIRST AMENDMENT TO AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF OMP GP LLC September 29, 2020 This First Amendment (this “Amendment”) to that certain Amended and Restated Limited Liability Company Agreement dated as of May 22, 2017 (the “Agreement”) of OMP GP LLC (the “Company”), dated as of September 29, 2020, is entered into by OMS Holdings LLC, a Delaware limited liability company (“Managing Member”), effective as of the date set forth above.

AMENDMENT NO. 1 SECOND AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT BEARTOOTH DEVCO LLC September 29, 2020

AMENDMENT NO. 1 TO SECOND AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF BEARTOOTH DEVCO LLC September 29, 2020 This Amendment No. 1 (this “Amendment”) to that certain Second Amended and Restated Limited Liability Company Agreement dated as of February 22, 2019 (the “Agreement”) of Beartooth DevCo LLC (the “Company”), dated as of September 29, 2020, is entered into by and between OMP

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Entry into a Material Definitive Agreement, Financial Statements and Exhibits - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 29, 2020 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or or

AMENDMENT NO. 1 SECOND AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT BOBCAT DEVCO LLC September 29, 2020

AMENDMENT NO. 1 TO SECOND AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF BOBCAT DEVCO LLC September 29, 2020 This Amendment No. 1 (this “Amendment”) to that certain Amended and Restated Limited Liability Company Agreement dated as of February 22, 2019 (the “Agreement”) of Bobcat DevCo LLC (the “Company”), dated as of September 29, 2020, is entered into by and between OMP Operating LLC

Waiver, Discharge and Forgiveness Agreement and Forbearance Extension Credit Agreement Dated as of September 29, 2020 OMP Operating LLC, As Borrower, Oasis Midstream Partners LP, As Parent, The Guarantors Party Hereto, Wells Fargo Bank, N.A., As Admi

Execution Version Waiver, Discharge and Forgiveness Agreement and Forbearance Extension to Credit Agreement Dated as of September 29, 2020 Among OMP Operating LLC, As Borrower, Oasis Midstream Partners LP, As Parent, The Guarantors Party Hereto, Wells Fargo Bank, N.

Oasis Midstream Partners Announces Quarterly Distribution for Second Quarter 2020

Exhibit 99.1 Oasis Midstream Partners Announces Quarterly Distribution for Second Quarter 2020 Houston, Texas — August 4, 2020 — Oasis Midstream Partners LP (NASDAQ: OMP) (“Oasis Midstream” or the “Partnership”) today declared a quarterly cash distribution of $0.54 per unit for the second quarter of 2020. The distribution will be paid on August 27, 2020, to all OMP unitholders of record at the clo

Oasis Midstream Partners LP Announces Quarter Ended June 30, 2020 Earnings

Exhibit 99.2 Oasis Midstream Partners LP Announces Quarter Ended June 30, 2020 Earnings Houston, Texas — August 5, 2020 — Oasis Midstream Partners LP (Nasdaq: OMP) (“OMP” or the “Partnership”) today announced financial and operating results for the second quarter of 2020. Second Quarter 2020 Highlights •Declared the quarterly cash distribution of $0.54 per unit. •Net income was $22.7 million and n

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 5, 2020 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or orga

Oasis Midstream Partners LP Announces Quarter Ended June 30, 2020 Earnings

Exhibit 99.2 Oasis Midstream Partners LP Announces Quarter Ended June 30, 2020 Earnings Houston, Texas — August 5, 2020 — Oasis Midstream Partners LP (Nasdaq: OMP) (“OMP” or the “Partnership”) today announced financial and operating results for the second quarter of 2020. Second Quarter 2020 Highlights •Declared the quarterly cash distribution of $0.54 per unit. •Net income was $22.7 million and n

Oasis Midstream Partners Announces Quarterly Distribution for Second Quarter 2020

Exhibit 99.1 Oasis Midstream Partners Announces Quarterly Distribution for Second Quarter 2020 Houston, Texas — August 4, 2020 — Oasis Midstream Partners LP (NASDAQ: OMP) (“Oasis Midstream” or the “Partnership”) today declared a quarterly cash distribution of $0.54 per unit for the second quarter of 2020. The distribution will be paid on August 27, 2020, to all OMP unitholders of record at the clo

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 5, 2020 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organi

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-38212 Oas

Oasis Midstream Partners LP Announces Quarter Ended March 31, 2020 Earnings and Updated 2020 Outlook

Exhibit 99.1 Oasis Midstream Partners LP Announces Quarter Ended March 31, 2020 Earnings and Updated 2020 Outlook Houston, Texas — May 18, 2020 — Oasis Midstream Partners LP (Nasdaq: OMP) (“OMP” or the “Partnership”) today announced financial and operating results for the first quarter of 2020 and updated its 2020 outlook. Highlights •Delivered net cash from operating activities of $61.7 million.

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-38212 Oa

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 18, 2020 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organiza

- NT 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 12b-25 NOTIFICATION OF LATE FILING (Check one):  Form 10-K  Form 20-F  Form 11-K  Form 10-Q  Form 10-D  Form N-CEN  Form N-CSR For Period Ended: March 31, 2020  Transition Report on Form 10-K  Transition Report on Form 20-F  Transition Report on Form 11-K  Transition Report on Form 10-Q For the Transition Perio

Oasis Midstream Partners Postpones First Quarter 2020 Earnings Release

Oasis Midstream Partners Postpones First Quarter 2020 Earnings Release HOUSTON, May 11, 2020 /PRNewswire/ - Oasis Midstream Partners LP (Nasdaq: OMP) (“Oasis Midstream” or the “Partnership”) today announced that it will postpone its first quarter 2020 earnings release and conference call, previously scheduled for today at 11:00 a.

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 11, 2020 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organiza

DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 DESCRIPTION OF THE COMMON UNITS

EXHIBIT 4.1 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 DESCRIPTION OF THE COMMON UNITS The Units The common units and the subordinated units are separate classes of limited partner interests in us. Unitholders are entitled to participate in partnership distributions and exercise the rights or privileges available to limited p

List of Subsidiaries of Oasis Midstream Partners LP

Exhibit 21.1 List of Subsidiaries of Oasis Midstream Partners LP Name of Subsidiary Jurisdiction of Incorporation or Organization OMP Operating LLC Delaware Panther DevCo LLC Delaware Bighorn DevCo LLC Delaware Bobcat DevCo LLC Delaware Beartooth DevCo LLC Delaware

LIMITED LIABILITY COMPANY AGREEMENT PANTHER DEVCO LLC a Delaware limited liability company

LIMITED LIABILITY COMPANY AGREEMENT OF PANTHER DEVCO LLC a Delaware limited liability company THIS LIMITED LIABILITY COMPANY AGREEMENT, effective as of May 9, 2019 (this “Agreement”), is adopted, executed and agreed to by OMP Operating LLC, a Delaware limited liability company (the “Sole Member”).

Annual Report - 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-38212 Oasis M

Oasis Midstream Partners LP Announces Year Ended December 31, 2019 Earnings

Exhibit 99.1 Oasis Midstream Partners LP Announces Year Ended December 31, 2019 Earnings Houston, Texas — February 25, 2020 — Oasis Midstream Partners LP (Nasdaq: OMP) (the “Partnership” or “OMP”) today announced financial results for the quarter and year ended December 31, 2019 and updated its 2020 outlook. 2019 Highlights: •Net income was $63.5 million(1) and net cash from operating activities w

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 25, 2020 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or org

OMP / Oasis Midstream Partners LP / Harvest Fund Advisors LLC - SC 13G/A Passive Investment

SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* OASIS MIDSTREAM PARTNERS LP (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 67420T206 (CUSIP Number) December 31, 2019 (Date of Event which Requires Filing of this Statement) Check the appropri

Oasis Midstream Partners LP Announces Preliminary Fourth Quarter 2019 Operating Results, Announces Quarterly Distribution, Comments on 2020 Outlook, and Schedules Earnings Conference Call

Oasis Midstream Partners LP Announces Preliminary Fourth Quarter 2019 Operating Results, Announces Quarterly Distribution, Comments on 2020 Outlook, and Schedules Earnings Conference Call Houston, Texas — January 30, 2020 — Oasis Midstream Partners LP (Nasdaq: OMP) (the “Partnership” or “OMP”) today announced preliminary operating results for the quarter and year ended December 31, 2019 and commented on its 2020 outlook.

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 30, 2020 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or orga

OMP / Oasis Midstream Partners LP / Wellington Management Group LLP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* Oasis Midstream Partners LP (Name of Issuer) Common Stock (Title of Class of Securities) 67420T206 (CUSIP Number) December 31, 2019 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

OMP / Oasis Midstream Partners LP 25 - - 25

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 25 NOTIFICATION OF REMOVAL FROM LISTING AND/OR REGISTRATION UNDER SECTION 12(b) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 001-38212 Oasis Midstream Partners LP / New York Stock Exchange (Exact name of Issuer as specified in its charter, And name of Exchange where security is listed and/or registered)

OMP / Oasis Midstream Partners LP 8-A12B - - 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OASIS MIDSTREAM PARTNERS LP (Exact Name of Registrant as Specified in its Charter) Delaware 47-1208855 (State of incorporation or organization) (IRS Employer Identification No.) 1001 Fannin Stree

Oasis Midstream Partners to Switch Listing to NASDAQ Stock Exchange

Oasis Midstream Partners to Switch Listing to NASDAQ Stock Exchange Houston, Texas — December 12, 2019 — Oasis Midstream Partners LP (NYSE: OMP) (“Oasis Midstream” or the “Partnership”) today announced that it is transferring the listing of its units from the New York Stock Exchange to The NASDAQ Stock Market LLC (“Nasdaq”).

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 12, 2019 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or org

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-3821

CRUDE OIL GATHERING AGREEMENT BY AND AMONG OASIS PETROLEUM PERMIAN LLC, OASIS PETROLEUM MARKETING LLC, PANTHER DEVCO LLC DATED AS OF November 1, 2019 DELAWARE BASIN TABLE OF CONTENTS

Exhibit 10.2 NOTE: Certain information has been excluded from this exhibit because it is both (i) not material and (ii) would likely be competitively harmful if publicly disclosed. Such excluded information has been marked at the appropriate place with brackets and three asterisks[***] CRUDE OIL GATHERING AGREEMENT BY AND AMONG OASIS PETROLEUM PERMIAN LLC, OASIS PETROLEUM MARKETING LLC, AND PANTHE

PRODUCED WATER GATHERING AND DISPOSAL AGREEMENT BY AND BETWEEN OASIS PETROLEUM PERMIAN LLC, PANTHER DEVCO LLC DATED AS OF November 1, 2019 DELAWARE BASIN TABLE OF CONTENTS ARTICLE 1 DEFINITIONS 1 ARTICLE 2 PRODUCER COMMITMENTS 6 Section 2.1 Producer'

Exhibit 10.3 NOTE: Certain information has been excluded from this exhibit because it is both (i) not material and (ii) would likely be competitively harmful if publicly disclosed. Such excluded information has been marked at the appropriate place with brackets and three asterisks [***] PRODUCED WATER GATHERING AND DISPOSAL AGREEMENT BY AND BETWEEN OASIS PETROLEUM PERMIAN LLC, AND PANTHER DEVCO LL

Oasis Midstream Partners LP Announces Quarter Ended September 30, 2019 Earnings

Oasis Midstream Partners LP Announces Quarter Ended September 30, 2019 Earnings Houston, Texas — November 5, 2019 — Oasis Midstream Partners LP (NYSE: OMP) (“OMP” or the “Partnership”) today announced financial and operating results for the third quarter of 2019.

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 5, 2019 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or orga

THIRD AMENDMENT CREDIT AGREEMENT DATED AS OF AUGUST 16, 2019 OASIS MIDSTREAM PARTNERS LP, AS PARENT, OMP OPERATING LLC, AS BORROWER, THE GUARANTORS, WELLS FARGO BANK, N.A., AS ADMINISTRATIVE AGENT AND ISSUING BANK, THE LENDERS PARTY HERETO THIRD AMEN

Execution Version THIRD AMENDMENT TO CREDIT AGREEMENT DATED AS OF AUGUST 16, 2019 AMONG OASIS MIDSTREAM PARTNERS LP, AS PARENT, OMP OPERATING LLC, AS BORROWER, THE GUARANTORS, WELLS FARGO BANK, N.

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 16, 2019 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organ

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-38212 Oas

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2019 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organi

Oasis Midstream Partners LP Announces Quarter Ended June 30, 2019 Earnings

Oasis Midstream Partners LP Announces Quarter Ended June 30, 2019 Earnings Houston, Texas — August 6, 2019 — Oasis Midstream Partners LP (NYSE: OMP) (“OMP” or the “Partnership”) today announced financial and operating results for the second quarter of 2019.

SECOND AMENDMENT CREDIT AGREEMENT DATED AS OF MAY 6, 2019 OASIS MIDSTREAM PARTNERS LP, AS PARENT, OMP OPERATING LLC, AS BORROWER, THE GUARANTORS, WELLS FARGO BANK, N.A., AS ADMINISTRATIVE AGENT AND ISSUING BANK, THE LENDERS PARTY HERETO SECOND AMENDM

Execution Version SECOND AMENDMENT TO CREDIT AGREEMENT DATED AS OF MAY 6, 2019 AMONG OASIS MIDSTREAM PARTNERS LP, AS PARENT, OMP OPERATING LLC, AS BORROWER, THE GUARANTORS, WELLS FARGO BANK, N.

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 or ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-38212 Oa

Oasis Midstream Partners LP Announces Quarter Ended March 31, 2019 Earnings

Oasis Midstream Partners LP Announces Quarter Ended March 31, 2019 Earnings Houston, Texas — May 7, 2019 — Oasis Midstream Partners LP (NYSE: OMP) (the “Partnership” or “OMP”) today announced financial results for the quarter ended March 31, 2019 and provided an operational update.

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 7, 2019 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organizat

List of Subsidiaries of Oasis Midstream Partners LP

Exhibit 21.1 List of Subsidiaries of Oasis Midstream Partners LP Name of Subsidiary Jurisdiction of Incorporation or Organization OMP Operating LLC Delaware Bobcat DevCo LLC Delaware Beartooth DevCo LLC Delaware Bighorn DevCo LLC Delaware

OMP / Oasis Midstream Partners LP 10-K (Annual Report)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ý ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 or ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-38212 Oasis M

BEARTOOTH DEVCO LLC SECOND AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT Dated as of February 22, 2019 TABLE OF CONTENTS

BEARTOOTH DEVCO LLC SECOND AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT Dated as of February 22, 2019 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND CONSTRUCTION 1 Section 1.

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 22, 2019 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or org

BOBCAT DEVCO LLC SECOND AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT Dated as of February 22, 2019 TABLE OF CONTENT

BOBCAT DEVCO LLC SECOND AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT Dated as of February 22, 2019 TABLE OF CONTENT Page ARTICLE I DEFINITIONS AND CONSTRUCTION 2 Section 1.

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 26, 2019 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or org

Oasis Midstream Partners LP Announces Year Ended December 31, 2018 Earnings

Exhibit 99.1 Oasis Midstream Partners LP Announces Year Ended December 31, 2018 Earnings Houston, Texas — February 26, 2019 — Oasis Midstream Partners LP (NYSE: OMP) (the “Partnership” or “OMP”) today announced financial results for the quarter and year ended December 31, 2018 and updated its 2019 outlook. Recent Highlights: • Declared the quarterly cash distribution for the fourth quarter of 2018

OMP / Oasis Midstream Partners LP / Harvest Fund Advisors LLC - SC 13G/A Passive Investment

SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* OASIS MIDSTREAM PARTNERS LP (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 67420T206 (CUSIP Number) December 31, 2018 (Date of Event which Requires Filing of this Statement) Check the appropr

OMP / Oasis Midstream Partners LP / Wellington Management Group LLP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Oasis Midstream Partners LP (Name of Issuer) Common Stock (Title of Class of Securities) 67420T206 (CUSIP Number) December 31, 2018 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which t

OMP / Oasis Midstream Partners LP / Perella Weinberg Partners Capital Management LP - PERELLA WEINBERG PARTNERS CAPITAL MANAGEMENT LP Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Oasis Midstream Partners LP (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 67420T206 (CUSIP Number) December 31, 2018 (Date of Event which Requires Filing of this Statement) Check the appropriate box t

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 5, 2019 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or orga

Oasis Midstream Partners Announces Quarterly Distribution and Schedules Fourth Quarter 2018 Conference Call

Oasis Midstream Partners Announces Quarterly Distribution and Schedules Fourth Quarter 2018 Conference Call Houston, Texas — February 5, 2019 — Oasis Midstream Partners LP (NYSE: OMP) (“Oasis Midstream” or the “Partnership”) today declared a quarterly cash distribution of $0.

UNAUDITED PRO FORMA CONDENSED CONSOLIDATED FINANCIAL INFORMATION

EXHIBIT 99.1 UNAUDITED PRO FORMA CONDENSED CONSOLIDATED FINANCIAL INFORMATION The unaudited pro forma condensed consolidated financial information and accompanying notes reflect the pro forma effects of: (1) Acquisition. On November 19, 2018, Oasis Midstream Partners LP (the "Partnership" or "OMP") consummated the transactions contemplated by a contribution agreement (the "Contribution Agreement")

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 19, 2018 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of

OMP / Oasis Midstream Partners LP / Oasis Petroleum Inc. - SC 13D AMENDMENT NO. 1 Activist Investment

SC 13D Amendment No. 1 SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 1) Oasis Midstream Partners LP (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 67420T 206 (CUSIP Number) Nickolas J. Lorentzatos 1001 Fannin Street, Suite 1500, Houston TX 77002 Tel: (281) 404-9500 (

Regulation FD Disclosure, Unregistered Sales of Equity Securities, Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 19, 2018 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or org

Oasis Midstream Partners LP Completes Acquisition of Additional Interests in Williston Basin Development Companies

Oasis Midstream Partners LP Completes Acquisition of Additional Interests in Williston Basin Development Companies HOUSTON, TX.

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 8, 2018 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or orga

2,000,000 Common Units Representing Limited Partner Interests OASIS MIDSTREAM PARTNERS LP UNDERWRITING AGREEMENT November 8, 2018

EXECUTION VERSION 2,000,000 Common Units Representing Limited Partner Interests OASIS MIDSTREAM PARTNERS LP UNDERWRITING AGREEMENT November 8, 2018 November 8, 2018 Morgan Stanley & Co.

2,000,000 Common Units Representing Limited Partner Interests

424B2 Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-227647 PROSPECTUS SUPPLEMENT (To Prospectus dated October 26, 2018) 2,000,000 Common Units Representing Limited Partner Interests We are offering 2,000,000 common units representing limited partner interests in Oasis Midstream Partners LP. Our common units trade on the New York Stock Exchange (“NYSE”) under the symbol “O

SUBJECT TO COMPLETION, DATED NOVEMBER 8, 2018

424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-227647 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not p

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 7, 2018 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or orga

Oasis Midstream Partners to Acquire Additional Interests in Development Companies from Oasis Petroleum

Oasis Midstream Partners to Acquire Additional Interests in Development Companies from Oasis Petroleum Houston, Texas — November 8, 2018 — Oasis Midstream Partners LP (NYSE: OMP) (the “Partnership” or “OMP”) today announced it has entered into a definitive agreement to acquire additional interests in Bobcat DevCo LLC (“Bobcat DevCo”) and Beartooth DevCo LLC (“Beartooth DevCo”) from Oasis Petroleum Inc.

CONTRIBUTION AGREEMENT dated as of November 7, 2018 by and among OMS HOLDINGS LLC, OASIS MIDSTREAM SERVICES LLC, OMP GP LLC, OASIS MIDSTREAM PARTNERS LP, OMP OPERATING LLC for purposes of Articles VI and VIII hereof, OASIS PETROLEUM INC. TABLE OF CON

Execution Version CONTRIBUTION AGREEMENT dated as of November 7, 2018 by and among OMS HOLDINGS LLC, OASIS MIDSTREAM SERVICES LLC, OMP GP LLC, OASIS MIDSTREAM PARTNERS LP, OMP OPERATING LLC and, for purposes of Articles VI and VIII hereof, OASIS PETROLEUM INC.

OMP / Oasis Midstream Partners LP 10-Q (Quarterly Report)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2018 or ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-3821

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 5, 2018 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or orga

Oasis Midstream Partners LP Announces Quarter Ended September 30, 2018 Earnings

Oasis Midstream Partners LP Announces Quarter Ended September 30, 2018 Earnings Houston, Texas — November 5, 2018 — Oasis Midstream Partners LP (NYSE: OMP) (the “Partnership” or “OMP”) today announced financial results for the quarter ended September 30, 2018 and provided an operational update.

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 30, 2018 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or orga

Oasis Midstream Partners Announces Quarterly Distribution

Oasis Midstream Partners Announces Quarterly Distribution Houston, Texas — October 30, 2018 — Oasis Midstream Partners LP (NYSE: OMP) (the “Partnership” or “OMP”) declared a quarterly cash distribution of $0.

OMP / Oasis Midstream Partners LP CORRESP

CORRESP Oasis Midstream Partners LP 1001 Fannin Street, Suite 1500 Houston, Texas 77002 (281) 404-9500 October 24, 2018 Via EDGAR United States Securities and Exchange Commission Division of Corporation Finance Mail Stop 3561 100 F Street, N.

OMP / Oasis Midstream Partners LP S-3

S-3 Table of Contents As filed with the Securities and Exchange Commission on October 1, 2018 Registration No.

Form of Indenture.

EX-4.1 Exhibit 4.1 [Form of Indenture] OASIS MIDSTREAM PARTNERS LP as Issuer, ANY SUBSIDIARY GUARANTORS PARTY HERETO, and [ ], as Trustee INDENTURE Dated as of Debt Securities CROSS-REFERENCE TABLE TIA Section Indenture Section 310 (a) 7.10 (b) 7.10 (c) N.A. 311 (a) 7.11 (b) 7.11 (c) N.A. 312 (a) 5.01 (b) 5.02 (c) 5.02 313 (a) 5.03 (b) 5.03 (c) 13.03 (d) 5.03 314 (a) 4.05 (b) N.A. (c)(1) 13.05 (c)

Statement of Computation of Ratio of Earnings to Fixed Charges.

EX-12.1 Exhibit 12.1 Oasis Midstream Partners LP Statement of Computation of Ratio of Earnings to Fixed Charges The table below sets forth our ratio of earnings to fixed charges for the periods indicated. Six Months Ended June 30, 2018 Year Ended December 31, 2017 2016 2015 (in thousands) Earnings: Income before income taxes $ 69,014 $ 95,405 $ 64,985 $ 52,781 Fixed charges 2,642 8,185 9,900 7,433

OMP / Oasis Midstream Partners LP S-8

As filed with the Securities and Exchange Commission on August 31, 2018 Registration No.

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 27, 2018 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organ

FIRST AMENDMENT CREDIT AGREEMENT DATED AS OF AUGUST 27, 2018 OASIS MIDSTREAM PARTNERS LP, AS PARENT, OMP OPERATING LLC, AS BORROWER, THE GUARANTORS, WELLS FARGO BANK, N.A., AS ADMINISTRATIVE AGENT AND ISSUING BANK, THE LENDERS PARTY HERETO FIRST AMEN

Execution Version FIRST AMENDMENT TO CREDIT AGREEMENT DATED AS OF AUGUST 27, 2018 AMONG OASIS MIDSTREAM PARTNERS LP, AS PARENT, OMP OPERATING LLC, AS BORROWER, THE GUARANTORS, WELLS FARGO BANK, N.

OMP / Oasis Midstream Partners LP 10-Q (Quarterly Report)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2018 or ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-38212 Oas

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2018 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organi

Oasis Midstream Partners LP Announces Quarter Ended June 30, 2018 Earnings and Distribution

Oasis Midstream Partners LP Announces Quarter Ended June 30, 2018 Earnings and Distribution Houston, Texas — August 6, 2018 — Oasis Midstream Partners LP (NYSE: OMP) (the “Partnership” or “OMP”) today announced financial results and cash distribution for the quarter ended June 30, 2018 and provided an operational update.

Indemnification Agreement, dated July 5, 2018, between Oasis Midstream Partners LP and Mr. Harry N. Pefanis.

Exhibit 10.1 INDEMNIFICATION AGREEMENT INDEMNIFICATION AGREEMENT (this “Agreement”), made and executed as of July 5, 2018 by and between Oasis Midstream Partners LP, a Delaware limited partnership (the “Partnership”) and Harry N. Pefanis, an individual resident of the State of Texas (the “Indemnitee”). WITNESSETH: WHEREAS, the Partnership is aware that, to induce and to retain highly competent per

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 5, 2018 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organiza

Oasis Midstream Partners Announces Appointment of Harry N. Pefanis to Board of Directors

Exhibit 99.1 Oasis Midstream Partners Announces Appointment of Harry N. Pefanis to Board of Directors Houston, Texas — July 11, 2018 — Oasis Midstream Partners LP (NYSE: OMP) (the “Partnership” or “OMP”) today announced the appointment of Harry N. Pefanis to the Board of Directors of OMP’s general partner, where he will also serve as a member of both the Audit and Conflicts Committees. Mr. Pefanis

OMP / Oasis Midstream Partners LP / KAYNE ANDERSON CAPITAL ADVISORS LP - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.2) Oasis Midstream Partners LP (Name of Issuer) COMMON UNITS (Title of Class of Securities) 67420T206 (CUSIP Number) Check the following box if a fee is being paid with this statement ☐. (A fee is not required only if the filing person: (1) has a previous sta

OMP / Oasis Midstream Partners LP 10-Q (Quarterly Report)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2018 or ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-38212 Oa

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 7, 2018 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or organizat

Oasis Midstream Partners LP Announces Quarter Ended March 31, 2018 Earnings and Distribution

Exhibit 99.1 Oasis Midstream Partners LP Announces Quarter Ended March 31, 2018 Earnings and Distribution Houston, Texas — May 7, 2018 — Oasis Midstream Partners LP (NYSE: OMP) (the “Partnership” or “OMP”) today announced financial results and cash distribution for the quarter ended March 31, 2018 and provided an operational update. Recent Highlights: • Declared the quarterly cash distribution for

JOINT FILING AGREEMENT

Exhibit A Exhibit A JOINT FILING AGREEMENT Pursuant to and in accordance with the Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder (the “Exchange Act”) the undersigned hereby agree to the joint filing on behalf of each of them of any filing required by such party under Section 13 of the Exchange Act or any rule or regulation thereunder (including any amendment, restatement, supplement, and/or exhibit thereto) with respect to securities of Oasis Midstream Partners LP, a Delaware limited partnership, and further agree to the filing, furnishing, and/or incorporation by reference of this Agreement as an exhibit thereto.

OMP / Oasis Midstream Partners LP / Harvest Fund Advisors LLC - SC 13G Passive Investment

SC 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* OASIS MIDSTREAM PARTNERS LP (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 67420T206 (CUSIP Number) March 30, 2018 (Date of Event which Requires Filing of this Statement) Check the appropriate bo

OMP / Oasis Midstream Partners LP / Harvest Fund Holdco L.p. - SC 13D/A Activist Investment

SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934* (Amendment No. 1) OASIS MIDSTREAM PARTNERS LP (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 67420T206 (CUSIP Number) John G. Finley c/o The Blackstone Group L.P. 345 Park Avenue New York, New York 10154 Tel: (

POWER OF ATTORNEY

Exhibit B Exhibit B POWER OF ATTORNEY Know all by these presents that Eric M. Conklin does hereby make, constitute and appoint Anthony Merhige and David Thayer, or either one of them, as a true and lawful attorney-in-fact of the undersigned with full powers of substitution and revocation, for and in the name, place and stead of the undersigned (both in the undersigned’s individual capacity and as

Financial Statements and Exhibits, Results of Operations and Financial Condition

Document UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 27, 2018 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporati

Oasis Midstream Partners LP Announces Quarter and Year Ending December 31, 2017 Earnings and Provides an Operational Update and 2018 Outlook

Exhibit Exhibit 99.1 Oasis Midstream Partners LP Announces Quarter and Year Ending December 31, 2017 Earnings and Provides an Operational Update and 2018 Outlook Houston, Texas ? February 27, 2018 ? Oasis Midstream Partners LP (NYSE: OMP) (the ?Partnership? or ?OMP?) today announced financial results for the quarter and year ended December 31, 2017 and provided its 2018 outlook. Recent Highlights:

OMP / Oasis Midstream Partners LP 10-K (Annual Report)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ý ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2017 or ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-38212 Oasis M

List of Subsidiaries of Oasis Midstream Partners LP

Exhibit 21.1 List of Subsidiaries of Oasis Midstream Partners LP Name of Subsidiary Jurisdiction of Incorporation or Organization OMP Operating LLC Delaware Bobcat DevCo LLC Delaware Beartooth DevCo LLC Delaware Bighorn DevCo LLC Delaware

OMP / Oasis Midstream Partners LP / Perella Weinberg Partners Capital Management LP - PERELLA WEINBERG PARTNERS CAPITAL MANAGEMENT LP Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 Oasis Midstream Partners LP (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 67420T206 (CUSIP Number) November 14, 2017 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rul

OMP / Oasis Midstream Partners LP / KAYNE ANDERSON CAPITAL ADVISORS LP - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.1) Oasis Midstream Partners LP (Name of Issuer) COMMON UNITS (Title of Class of Securities) 67420T206 (CUSIP Number) Check the following box if a fee is being paid with this statement [ ]. (A fee is not required only if the filing person: (1) has a previous s

Financial Statements and Exhibits, Results of Operations and Financial Condition

Document UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 2, 2018 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporatio

Oasis Midstream Partners Announces Third Quarter 2017 and Fourth Quarter 2017 Distributions

Exhibit Exhibit 99.1 Oasis Midstream Partners Announces Third Quarter 2017 and Fourth Quarter 2017 Distributions Houston, Texas ? February 2, 2018 ? Oasis Midstream Partners LP (NYSE: OMP) (?Oasis Midstream? or the ?Partnership?) today announced that the Board of Directors of OMP GP LLC, the general partner of the Partnership, declared the initial quarterly cash distribution of $0.3750 per unit fo

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2017 or ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-3821

AMENDMENT NO. 1 AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT BOBCAT DEVCO LLC November 7, 2017

EX-10.25 2 omp-ex1025x930017xq3.htm EXHIBIT 10.25 EXHIBIT 10.25 AMENDMENT NO. 1 TO AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF BOBCAT DEVCO LLC November 7, 2017 This Amendment No. 1 (this “Amendment”) to that certain Amended and Restated Limited Liability Company Agreement dated as of September 25, 2017 (the “Agreement”) of Bobcat DevCo LLC, a Delaware limited liability company (th

AMENDMENT NO. 1 AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT BEARTOOTH DEVCO LLC November 7, 2017

EXHIBIT 10.26 AMENDMENT NO. 1 TO AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF BEARTOOTH DEVCO LLC November 7, 2017 This Amendment No. 1 (this “Amendment”) to that certain Amended and Restated Limited Liability Company Agreement dated as of September 25, 2017 (the “Agreement”) of Beartooth DevCo LLC, a Delaware limited liability company (the “Company”), is entered into by and between

OMP / Oasis Midstream Partners LP / KAYNE ANDERSON CAPITAL ADVISORS LP - SC 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 Oasis Midstream Partners LP (Name of Issuer) COMMON UNITS (Title of Class of Securities) 67420T206 (CUSIP Number) Check the following box if a fee is being paid with this statement ☐. (A fee is not required only if the filing person: (1) has a previous statement on file re

Oasis Midstream Partners LP Announces Quarter Ended September 30, 2017 Earnings

Exhibit 99.1 Oasis Midstream Partners LP Announces Quarter Ended September 30, 2017 Earnings Houston, Texas ? November 7, 2017 ? Oasis Midstream Partners LP (NYSE: OMP) (the ?Partnership? or ?OMP?) today announced financial results for the quarter ended September 30, 2017 and provided an operational update. Recent Highlights: ? Completed initial public offering (?IPO? or the ?Offering?) of 8,625,0

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 7, 2017 OASIS MIDSTREAM PARTNERS LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or other jurisdiction of incorporation or orga

OMP / Oasis Midstream Partners LP / Harvest Fund Advisors LLC - SC 13D Activist Investment

SC 13D UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934* (Amendment No. ) OASIS MIDSTREAM PARTNERS LP (Name of Issuer) Common Units Representing Limited Partner Interests (Title of Class of Securities) 67420T206 (CUSIP Number) Anthony Merhige Harvest Fund Advisors LLC 100 West Lancaster Avenue, Suite 200 Wayne, Pennsylva

JOINT FILING AGREEMENT

EX-99.A EXHIBIT A JOINT FILING AGREEMENT Pursuant to and in accordance with the Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder (the “Exchange Act”) the undersigned hereby agree to the joint filing on behalf of each of them of any filing required by such party under Section 13 of the Exchange Act or any rule or regulation thereunder (including any amendment, r

Joint Filing Agreement

EX-99.A EXHIBIT A Joint Filing Agreement This will confirm the agreement by and among all the undersigned that the Statement on Schedule 13D filed on or about this date and any further amendments thereto with respect to the beneficial ownership by the undersigned of the common units and subordinated units of Oasis Midstream Partners LP, a Delaware limited partnership (the “Issuer”), and such other

OMP / Oasis Midstream Partners LP / Oasis Petroleum Inc. - SC 13D Activist Investment

SC 13D SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.

Revolving Credit Agreement, dated as of September 25, 2017, by and among Oasis Midstream Partners LP, as parent, OMP Operating LLC, as borrower, and Wells Fargo Bank, N.A., as administrative agent, and the lenders party thereto.

EX-10.10 Exhibit 10.10 DEAL CUSIP: 67097KAA6 FACILITY CUSIP: 67097KAB4 CREDIT AGREEMENT DATED AS OF SEPTEMBER 25, 2017 AMONG OASIS MIDSTREAM PARTNERS LP, AS PARENT, OMP OPERATING LLC, AS BORROWER, WELLS FARGO BANK, N.A., AS ADMINISTRATIVE AGENT AND THE LENDERS PARTY HERETO SOLE LEAD ARRANGER AND SOLE BOOKRUNNER WELLS FARGO SECURITIES, LLC TABLE OF CONTENTS Page ARTICLE I Definitions and Accounting

Indemnification Agreement, dated as of September 25, 2017, by and between Oasis Midstream Partners LP and Matthew D. Fitzgerald.

EX-10.21 Exhibit 10.21 Execution Version INDEMNIFICATION AGREEMENT INDEMNIFICATION AGREEMENT (this “Agreement”), made and executed as of September 25, 2017 by and between Oasis Midstream Partners LP, a Delaware limited partnership (the “Partnership”) and Matthew Fitzgerald, an individual resident of the State of Texas (the “Indemnitee”). WITNESSETH: WHEREAS, the Partnership is aware that, to induc

Omnibus Agreement, dated as of September 25, 2017, by and among Oasis Midstream Partners LP, Oasis Petroleum Inc., Oasis Petroleum LLC, OMS Holdings LLC, Oasis Midstream Services LLC, OMP GP LLC and OMP Operating LLC.

EX-10.2 Exhibit 10.2 Execution Version OMNIBUS AGREEMENT by and among OASIS PETROLEUM INC., OASIS PETROLEUM LLC, OMS HOLDINGS LLC, OASIS MIDSTREAM SERVICES LLC, OASIS MIDSTREAM PARTNERS LP, OMP GP LLC and OMP OPERATING LLC This OMNIBUS AGREEMENT (“Agreement”) is entered into on, and effective as of, the Closing Date (as defined herein) among Oasis Petroleum Inc., a Delaware corporation (“Oasis”),

Services and Secondment Agreement, dated as of September 25, 2017, by and between Oasis Midstream Partners LP and Oasis Petroleum Inc.

Exhibit 10.11 Execution Version SERVICES AND SECONDMENT AGREEMENT This Services and Secondment Agreement (this ?Agreement?), effective as of September 25, 2017 (the ?Effective Date?), is entered into by and between Oasis Petroleum Inc., a Delaware corporation (?Oasis?) and Oasis Midstream Partners LP, a Delaware limited partnership (the ?MLP?). Each of the foregoing is referred to herein as a ?Par

Amended and Restated Limited Liability Company Agreement of Bobcat DevCo LLC, dated as of September 25, 2017, by and between OMP Operating LLC, as the managing member, and Oasis Midstream Services LLC, as a member.

EX-10.13 Exhibit 10.13 Execution Version BOBCAT DEVCO LLC AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT Dated Effective as of September 25, 2017 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND CONSTRUCTION 1 Section 1.1 Definitions 1 Section 1.2 Construction 10 ARTICLE II BUSINESS PURPOSE AND TERM OF THE COMPANY 11 Section 2.1 Formation 11 Section 2.2 Name 11 Section 2.3 Registered Off

Indemnification Agreement, dated as of September 25, 2017, by and between Oasis Midstream Partners LP and Thomas B. Nusz.

EX-10.15 Exhibit 10.15 Execution Version INDEMNIFICATION AGREEMENT INDEMNIFICATION AGREEMENT (this “Agreement”), made and executed as of September 25, 2017 by and between Oasis Midstream Partners LP, a Delaware limited partnership (the “Partnership”) and Thomas B. Nusz, an individual resident of the State of Texas (the “Indemnitee”). WITNESSETH: WHEREAS, the Partnership is aware that, to induce an

Produced and Flowback Water Gathering and Disposal Agreement – Beartooth Area, dated as of September 25, 2017, by and among Oasis Midstream Partners LP, Oasis Petroleum North America LLC and Oasis Midstream Services LLC.

EX-10.6 SPECIFIC TERMS IN THIS EXHIBIT HAVE BEEN REDACTED BECAUSE CONFIDENTIAL TREATMENT FOR THOSE TERMS HAS BEEN GRANTED. THE REDACTED MATERIAL HAS BEEN SEPARATELY FILED WITH THE SECURITIES AND EXCHANGE COMMISSION, AND THE TERMS HAVE BEEN MARKED AT THE APPROPRIATE PLACE WITH BRACKETS AND THREE ASTERISKS [***] Exhibit 10.6 PRODUCED AND FLOWBACK WATER GATHERING AND DISPOSAL AGREEMENT BY AND AMONG O

Amendment #1 and Assignment Agreement, dated as of September 25, 2017, by and among Oasis Midstream Partners LP, Oasis Petroleum Marketing LLC and Oasis Midstream Services LLC.

SPECIFIC TERMS IN THIS EXHIBIT HAVE BEEN REDACTED BECAUSE CONFIDENTIAL TREATMENT FOR THOSE TERMS HAS BEEN REQUESTED.

Indemnification Agreement, dated as of September 25, 2017, by and between Oasis Midstream Partners LP and Richard N. Robuck.

EX-10.18 Exhibit 10.18 Execution Version INDEMNIFICATION AGREEMENT INDEMNIFICATION AGREEMENT (this “Agreement”), made and executed as of September 25, 2017 by and between Oasis Midstream Partners LP, a Delaware limited partnership (the “Partnership”) and Richard N. Robuck, an individual resident of the State of Texas (the “Indemnitee”). WITNESSETH: WHEREAS, the Partnership is aware that, to induce

Indemnification Agreement, dated as of September 25, 2017, by and between Oasis Midstream Partners LP and Phillip D. Kramer.

EX-10.20 22 d451626dex1020.htm EX-10.20 Exhibit 10.20 Execution Version INDEMNIFICATION AGREEMENT INDEMNIFICATION AGREEMENT (this “Agreement”), made and executed as of September 25, 2017 by and between Oasis Midstream Partners LP, a Delaware limited partnership (the “Partnership”) and Phillip D. Kramer, an individual resident of the State of Texas (the “Indemnitee”). WITNESSETH: WHEREAS, the Partn

Amended and Restated Limited Liability Company Agreement of Beartooth DevCo LLC, dated as of September 25, 2017, by and between OMP Operating LLC, as the member, and Oasis Midstream Services LLC, as the original member.

EX-10.14 Exhibit 10.14 Execution Version BEARTOOTH DEVCO LLC AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT Dated Effective as of September 25, 2017 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND CONSTRUCTION 1 Section 1.1 Definitions 1 Section 1.2 Construction 10 ARTICLE II BUSINESS PURPOSE AND TERM OF THE COMPANY 11 Section 2.1 Formation 11 Section 2.2 Name 11 Section 2.3 Registered

Indemnification Agreement, dated as of September 25, 2017, by and between Oasis Midstream Partners LP and Michael H. Lou.

EX-10.17 19 d451626dex1017.htm EX-10.17 Exhibit 10.17 Execution Version INDEMNIFICATION AGREEMENT INDEMNIFICATION AGREEMENT (this “Agreement”), made and executed as of September 25, 2017 by and between Oasis Midstream Partners LP, a Delaware limited partnership (the “Partnership”) and Michael H. Lou, an individual resident of the State of Texas (the “Indemnitee”). WITNESSETH: WHEREAS, the Partners

Indemnification Agreement, dated as of September 25, 2017, by and between Oasis Midstream Partners LP and Nickolas J. Lorentzatos.

EX-10.19 Exhibit 10.19 Execution Version INDEMNIFICATION AGREEMENT INDEMNIFICATION AGREEMENT (this “Agreement”), made and executed as of September 25, 2017 by and between Oasis Midstream Partners LP, a Delaware limited partnership (the “Partnership”) and Nickolas J. Lorentzatos, an individual resident of the State of Texas (the “Indemnitee”). WITNESSETH: WHEREAS, the Partnership is aware that, to

Crude Oil Gathering, Stabilization, Blending and Storage Agreement, dated as of September 25, 2017, by and among Oasis Midstream Partners LP, Oasis Petroleum North America LLC, Oasis Petroleum Marketing LLC and Oasis Midstream Services LLC.

EX-10.4 SPECIFIC TERMS IN THIS EXHIBIT HAVE BEEN REDACTED BECAUSE CONFIDENTIAL TREATMENT FOR THOSE TERMS HAS BEEN GRANTED. THE REDACTED MATERIAL HAS BEEN SEPARATELY FILED WITH THE SECURITIES AND EXCHANGE COMMISSION, AND THE TERMS HAVE BEEN MARKED AT THE APPROPRIATE PLACE WITH BRACKETS AND THREE ASTERISKS [***] Exhibit 10.4 CRUDE OIL GATHERING, STABILIZATION, BLENDING AND STORAGE AGREEMENT BY AND A

Freshwater Purchase and Sales Agreement, dated as of September 25, 2017, by and among Oasis Midstream Partners LP, Oasis Petroleum North America LLC and Oasis Midstream Services LLC.

EX-10.7 SPECIFIC TERMS IN THIS EXHIBIT HAVE BEEN REDACTED BECAUSE CONFIDENTIAL TREATMENT FOR THOSE TERMS HAS BEEN EITHER REQUESTED OR GRANTED. THE REDACTED MATERIAL HAS BEEN SEPARATELY FILED WITH THE SECURITIES AND EXCHANGE COMMISSION, AND THE TERMS HAVE BEEN MARKED AT THE APPROPRIATE PLACE WITH BRACKETS AND THREE ASTERISKS [***] Exhibit 10.7 FRESHWATER PURCHASE AND SALES AGREEMENT BY AND AMONG OA

Registration Rights Agreement, dated as of September 25, 2017, by and between Oasis Midstream Partners LP and OMS Holdings Inc.

EX-10.9 Exhibit 10.9 Execution Version REGISTRATION RIGHTS AGREEMENT THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”) is made and entered into as of September 25, 2017, by and between Oasis Midstream Partners LP, a Delaware limited partnership (the “Partnership”), and OMS Holdings LLC, a Delaware limited liability company (“MLP Holdco”). WHEREAS, this Agreement is made in connection with the

Produced and Flowback Water Gathering and Disposal Agreement – Wild Basin, dated as of September 25, 2017, by and among Oasis Midstream Partners LP, Oasis Petroleum North America LLC and Oasis Midstream Services LLC.

EX-10.5 SPECIFIC TERMS IN THIS EXHIBIT HAVE BEEN REDACTED BECAUSE CONFIDENTIAL TREATMENT FOR THOSE TERMS HAS BEEN GRANTED. THE REDACTED MATERIAL HAS BEEN SEPARATELY FILED WITH THE SECURITIES AND EXCHANGE COMMISSION, AND THE TERMS HAVE BEEN MARKED AT THE APPROPRIATE PLACE WITH BRACKETS AND THREE ASTERISKS [***] Exhibit 10.5 PRODUCED AND FLOWBACK WATER GATHERING AND DISPOSAL AGREEMENT BY AND AMONG O

Gas Gathering, Compression, Processing and Gas Lift Agreement, dated as of September 25, 2017, by and among Oasis Midstream Partners LP, Oasis Petroleum North America LLC, Oasis Petroleum Marketing LLC and Oasis Midstream Services LLC.

SPECIFIC TERMS IN THIS EXHIBIT HAVE BEEN REDACTED BECAUSE CONFIDENTIAL TREATMENT FOR THOSE TERMS HAS BEEN EITHER REQUESTED OR GRANTED.

Amended and Restated Limited Liability Company Agreement of Bighorn DevCo LLC, dated as of September 25, 2017, by and between OMP Operating LLC, as the managing member, and Oasis Midstream Services LLC, as a member.

Exhibit 10.12 Execution Version AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF BIGHORN DEVCO LLC (A DELAWARE LIMITED LIABILITY COMPANY) This AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT (this ?Agreement?) of Bighorn DevCo LLC, a Delaware limited liability company (the ?Company?), effective as of September 25, 2017 (the ?Effective Date?), is adopted, executed and agreed to

Contribution Agreement, dated as of September 25, 2017, by and among Oasis Midstream Partners LP, Oasis Petroleum LLC, OMS Holdings LLC, Oasis Midstream Services LLC, OMP GP LLC and OMP Operating LLC.

EX-10.1 Exhibit 10.1 Execution Version CONTRIBUTION AGREEMENT BY AND AMONG OASIS PETROLEUM LLC OMS HOLDINGS LLC OASIS MIDSTREAM SERVICES LLC OMP GP LLC OASIS MIDSTREAM PARTNERS LP AND OMP OPERATING LLC DATED AS OF SEPTEMBER 25, 2017 CONTRIBUTION AGREEMENT This Contribution Agreement, dated as of September 25, 2017 (this “Agreement”), is entered into by and among Oasis Petroleum LLC, a Delaware lim

Amended and Restated Agreement of Limited Partnership of Oasis Midstream Partners LP, dated September 25, 2017, by and between OMP GP LLC, as the general partner, and OMS Holdings LLC, as the organizational limited partner.

EX-3.1 Exhibit 3.1 Execution Version AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP OF OASIS MIDSTREAM PARTNERS LP TABLE OF CONTENTS ARTICLE I DEFINITIONS Section 1.1 Definitions 1 Section 1.2 Construction 25 ARTICLE II ORGANIZATION Section 2.1 Formation 25 Section 2.2 Name 25 Section 2.3 Registered Office; Registered Agent; Principal Office; Other Offices 25 Section 2.4 Purpose and Busines

Indemnification Agreement, dated as of September 25, 2017, by and between Oasis Midstream Partners LP and Taylor L. Reid.

Exhibit 10.16 Execution Version INDEMNIFICATION AGREEMENT INDEMNIFICATION AGREEMENT (this “Agreement”), made and executed as of September 25, 2017 by and between Oasis Midstream Partners LP, a Delaware limited partnership (the “Partnership”) and Taylor L. Reid, an individual resident of the State of Texas (the “Indemnitee”). WITNESSETH: WHEREAS, the Partnership is aware that, to induce and to reta

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Completion of Acquisition or Disposition of Assets

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): September 29, 2017 (September 25, 2017) Oasis Midstream Partners LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or Other Jurisdiction o

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): September 26, 2017 (September 20, 2017) Oasis Midstream Partners LP (Exact name of registrant as specified in its charter) Delaware 001-38212 47-1208855 (State or Other Jurisdiction o

Powers of Attorney (included on the signature page hereof).

As filed with the Securities and Exchange Commission on September 25, 2017 Registration No.

Form of Restricted Unit Award Agreement

Exhibit 4.5 Restricted Unit Award Agreement This Restricted Unit Award Agreement (this “Agreement”) is made and entered into as of the Date of Grant set forth in the Restricted Unit Award Grant Notice (“Notice of Grant”) by and between OMP GP LLC, a Delaware limited liability company (the “General Partner”), and [•] (“you” or “Service Provider”). Capitalized terms used but not specifically defined

Form of Restricted Unit Award Grant Notice

Exhibit 4.6 RESTRICTED UNIT AWARD GRANT NOTICE Pursuant to the terms and conditions of the Oasis Midstream Partners LP 2017 Long Term Incentive Plan, attached as Appendix A (the ?Plan?), and the associated Restricted Unit Award Agreement, attached as Appendix B (the ?Agreement?), OMP GP LLC, a Delaware limited liability company, the general partner (?General Partner?) of Oasis Midstream Partners L

Oasis Midstream Partners LP 2017 Long Term Incentive Plan

Exhibit 4.4 OASIS MIDSTREAM PARTNERS LP 2017 LONG TERM INCENTIVE PLAN 1. Purpose of the Plan. The Oasis Midstream Partners LP 2017 Long Term Incentive Plan (the “Plan”) has been adopted on September 11, 2017 by OMP GP LLC, a Delaware limited liability company, the general partner (“General Partner”) of Oasis Midstream Partners LP, a Delaware limited partnership (the “Partnership”), effective as of

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