Sec Form 4 Filing - Trudeau Mark @ Mallinckrodt plc - 2022-06-16

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 Trudeau Mark 2. Issuer Name and Ticker or Trading Symbol Mallinckrodt plc [ MNKPF] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) President and CEO (Last) (First) (Middle) 675 MCDONNELL BLVD. 3. Date of Earliest Transaction (MM/DD/YY) 06/16/2022 (Street) HAZELWOOD, MO63042 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

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 Employee Share Options (Right to Buy) $ 41.73 06/16/2022 D( 1 )( 2 )( 3 ) 38,875 12/03/2013 12/02/2022 Ordinary shares 38,875 $ 0 0 D Employee Share Options (Right to Buy) $ 44 06/16/2022 D( 1 )( 2 )( 3 ) 234,437 07/01/2016 06/30/2023 Ordinary shares 234,437 $ 0 0 D Employee Share Options (Right to Buy) $ 51.35 06/16/2022 D( 1 )( 2 )( 3 ) 63,542 01/02/2015 01/02/2024 Ordinary shares 63,542 $ 0 0 D Employee Share Options (Right to Buy) $ 96.96 06/16/2022 D( 1 )( 2 )( 3 ) 108,014 01/02/2016 01/02/2025 Ordinary shares 108,014 $ 0 0 D Employee Share Options (Right to Buy) $ 72.61 06/16/2022 D( 1 )( 2 )( 3 ) 175,528 01/04/2017 01/04/2026 Ordinary shares 175,528 $ 0 0 D Employee Share Options (Right to Buy) $ 51.73 06/16/2022 D( 1 )( 2 )( 3 ) 249,785 01/03/2018 01/03/2027 Ordinary shares 249,785 $ 0 0 D Employee Share Options (Right to Buy) $ 13.8 06/16/2022 D( 1 )( 2 )( 3 ) 946,003 04/02/2019 04/02/2028 Ordinary shares 946,003 $ 0 0 D Employee Share Options (Right to Buy) $ 22.26 06/16/2022 D( 1 )( 2 )( 3 ) 514,002 04/01/2020 04/01/2029 Ordinary shares 514,002 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Trudeau Mark 675 MCDONNELL BLVD. HAZELWOOD, MO63042 X President and CEO Signatures /s/ Mark J. Casey, Attorney-in-Fact 06/21/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On October 12, 2020, Mallinckrodt plc, an Irish public limited company in examination under Part 10 of the Companies Act 2014 of Ireland ("Mallinckrodt"), and certain of its subsidiaries voluntarily initiated proceedings under chapter 11 of title 11 of the United States Code (the "Bankruptcy Code") in the U.S. Bankruptcy Court for the District of Delaware (the "Bankruptcy Court"). On February 3, 2022, the Bankruptcy Court issued an opinion (which was subsequently revised on February 8, 2022 to make minor corrections) stating its intention to confirm Mallinckrodt's Fourth Amended Joint Plan of Reorganization of Mallinckrodt Plc and Its Debtor Affiliates Under Chapter 11 of the Bankruptcy Code. ( 2 )(Continued from Footnote 1) On March 2, 2022, the Bankruptcy Court entered an order confirming the Fourth Amended Joint Plan of Reorganization (with Technical Modifications) of Mallinckrodt Plc and Its Debtor Affiliates Under Chapter 11 of the Bankruptcy Code (as amended, supplemented or otherwise modified, the "Plan"), and on June 16, 2022 (the "Effective Date"), the Plan became effective and Mallinckrodt emerged from bankruptcy. ( 3 )On the Effective Date, all of Mallinckrodt's previously outstanding ordinary shares (the "Ordinary Shares"), including options, warrants, rights, restricted stock units or other securities or agreements to acquire such ordinary shares, were cancelled and extinguished pursuant to the Plan.

Remarks: In connection with emergence, the reporting person ceased to be a Section 16 reporting person.This Form 4 constitutes a notice to the Issuer for purposes of Part V of the Companies Act 2014.

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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