Sec Form 4 Filing - LOHOEFENER SIRIKKA R @ WHITING PETROLEUM CORP - 2022-07-01

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person LOHOEFENER SIRIKKA R 2. Issuer Name and Ticker or Trading Symbol WHITING PETROLEUM CORP [ WLL] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Former VP and Controller (Last) (First) (Middle) 1700 LINCOLN STREET, SUITE 4700 3. Date of Earliest Transaction (MM/DD/YY) 07/01/2022 (Street) DENVER, CO80203 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock, par value $0.001 per share ("Common Stock") 07/01/2022 D 1,692( 1 )( 2 ) D 0 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Restricted Stock Units 2021 ( 1 )( 2 ) 07/01/2022 D 3,399 ( 1 )( 2 ) ( 1 )( 2 ) Common Stock 3,399 ( 1 )( 2 ) 0 D Performance Share Units (Absolute) 2021 ( 3 ) 07/01/2022 D 2,547 ( 3 ) ( 3 ) Common Stock 2,547 ( 3 ) 0 D Performance Share Units (Relative) 2021 ( 3 ) 07/01/2022 D 2,547 ( 3 ) ( 3 ) Common Stock 2,547 ( 3 ) 0 D Restricted Stock Units 2022 ( 1 )( 2 ) 07/01/2022 D 2,392 ( 1 )( 2 ) ( 1 )( 2 ) Common Stock 2,392 ( 1 )( 2 ) 0 D Performance Share Units (Absolute) 2022 ( 3 ) 07/01/2022 D 1,196 ( 3 ) ( 3 ) Common Stock 1,196 ( 3 ) 0 D Performance Share Units (Relative) 2022 ( 3 ) 07/01/2022 D 1,196 ( 3 ) ( 3 ) Common Stock 1,196 ( 3 ) 0 D Warrants to Purchase Shares of Common Stock ( 4 ) 07/01/2022 D 1,567 ( 4 ) ( 4 ) Common Stock 1,567 ( 4 ) 0 D 2022 Special RSU Grant ( 1 )( 2 ) 07/01/2022 D 4,000 ( 1 )( 2 ) ( 1 )( 2 ) Common Stock 4,000 ( 1 )( 2 ) 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other LOHOEFENER SIRIKKA R 1700 LINCOLN STREET SUITE 4700 DENVER, CO80203 Former VP and Controller Signatures /s /M. Scott Regan, Attorney-in-Fact for Lohoefener Sirikka R 07/05/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This Form 4 reports securities disposed of in connection with the Agreement and Plan of Merger, dated March 7, 2022 (as it may be amended or supplemented from time to time, the "Merger Agreement"), by and among Oasis Petroleum Inc., a Delaware corporation ("Oasis"), Ohm Merger Sub Inc., a Delaware corporation and a wholly owned subsidiary of Oasis ("Merger Sub"), New Ohm LLC, a Delaware limited liability company and a wholly owned subsidiary of Oasis, and Whiting Petroleum Corporation, a Delaware corporation ("Whiting"). Pursuant to the Merger Agreement, on July 1, 2022 (the "Company Merger Effective Time"), Merger Sub merged with and into Whiting (the "Company Merger"), with Whiting continuing its existence as the surviving corporation following the Company Merger as a direct, wholly owned subsidiary of Oasis. ( 2 )Pursuant to the Merger Agreement, any outstanding unvested restricted stock unit ("RSUs") were assumed by Oasis and converted into the right to receive an RSU of Oasis exchangeable for shares of common stock, par value $0.01 per share ("Oasis Common Stock"), of Oasis. The Merger Agreement was filed by Whiting on March 7, 2022, as Exhibit 2.1 to its Current Report on Form 8-K. ( 3 )Pursuant to the Merger Agreement, at the Company Merger Effective Time, the performance vesting conditions of each performance stock unit ("PSU") award of Whiting were deemed satisfied based on the greater of (1) the target number of PSUs and (2) achievement of the applicable performance criteria based on a truncated performance period ending immediately prior to the Company Merger Effective Time, with such number of PSUs assumed by Oasis and converted into a right to receive the Merger Consideration upon satisfaction of the original continued service vesting conditions applicable to such PSUs. Based on this performance criteria Whiting expects the PSUs (Absolute) to vest at 200%. ( 4 )Pursuant to the terms of the Merger Agreement, each of the Reporting Person's outstanding warrants to purchase shares of Common Stock ("Warrants") was assumed by Oasis at the Company Merger Effective Time on nearly equivalent terms and conditions, (i) except that the number of shares of Oasis Common Stock subject to such Warrant was adjusted by the exchange ratio and (ii) the exercise price of such Warrant was reduced by the cash consideration and adjusted by the exchange ratio.

Remarks: By virtue of the Merger Agreement, the Reporting Person has ceased being a Section 16 officer of Whiting.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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