Sec Form 4 Filing - MYERS WOODROW A JR @ Mallinckrodt plc - 2023-11-14

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

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person MYERS WOODROW A JR 2. Issuer Name and Ticker or Trading Symbol Mallinckrodt plc [ MNKTQ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 675 MCDONNELL BLVD. 3. Date of Earliest Transaction (MM/DD/YY) 11/14/2023 (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 Ordinary Shares 11/14/2023 D( 1 )( 2 )( 3 ) 23,122 D $ 0 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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other MYERS WOODROW A JR 675 MCDONNELL BLVD. HAZELWOOD, MO63042 X Signatures /s/ Mark Tyndall, Attorney-in-Fact 11/16/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On August 28, 2023, Mallinckrodt plc (the "Company") and certain of its subsidiaries voluntarily initiated proceedings under chapter 11 of title 11 of the United States Code in the U.S. Bankruptcy Court for the District of Delaware (the "Bankruptcy Court"). On September 20, 2023, the Company's directors presented a petition before the High Court of Ireland (the "Irish High Court") seeking the appointment of an examiner (the "Examiner") to the Company, thereby commencing examinership proceedings with respect to the Company in Ireland. ( 2 )On October 10, 2023, the Bankruptcy Court entered an order confirming the First Amended Prepackaged Joint Chapter 11 Plan of Reorganization of Mallinckrodt Plc and Its Debtor Affiliates (as may be amended or supplemented from time to time in accordance with its terms, the "Plan"). On November 10, 2023, the Irish High Court made an order confirming a scheme of arrangement proposed by the Examiner that is based on and consistent in all respects with the Plan (the "Scheme"). On November 14, 2023 (the "Effective Date"), the Plan and the Scheme became effective and the Company emerged from bankruptcy. ( 3 )On the Effective Date, all of the Company'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 and the Scheme. 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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.