SEC Form 4

FORM 4		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 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* O'Neill Hugh M. (Last) (First) (Middle) 675 MCDONNELL BLVD. (Street) HAZELWOOD MO 63042 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol Mallinckrodt plc [ MNKPF ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner X Officer (give title below) Other (specify below) See Remarks
	3. Date of Earliest Transaction (Month/Day/Year) 06/16/2022
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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	06/16/2022		D(1)(2)(3)		76,856	D	$0.00	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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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)	$51.35	06/16/2022		D(1)(2)(3)			15,062	01/02/2015	01/02/2024	Ordinary Shares	15,062	$0.00	0	D
Employee Share Options (Right to Buy)	$51.35	06/16/2022		D(1)(2)(3)			9,414	01/02/2017	01/02/2024	Ordinary Shares	9,414	$0.00	0	D
Employee Share Options (Right to Buy)	$96.96	06/16/2022		D(1)(2)(3)			16,551	01/02/2016	01/02/2025	Ordinary Shares	16,551	$0.00	0	D
Employee Share Options (Right to Buy)	$72.61	06/16/2022		D(1)(2)(3)			30,605	01/04/2017	01/04/2026	Ordinary Shares	30,605	$0.00	0	D
Employee Share Options (Right to Buy)	$51.73	06/16/2022		D(1)(2)(3)			54,301	01/03/2018	01/03/2027	Ordinary Shares	54,301	$0.00	0	D
Employee Share Options (Right to Buy)	$51.73	06/16/2022		D(1)(2)(3)			54,301	01/03/2021	01/03/2027	Ordinary Shares	54,301	$0.00	0	D
Employee Share Options (Right to Buy)	$13.8	06/16/2022		D(1)(2)(3)			128,657	04/02/2019	04/02/2028	Ordinary Shares	128,657	$0.00	0	D
Employee Share Options (Right to Buy)	$22.26	06/16/2022		D(1)(2)(3)			102,801	04/01/2020	04/01/2029	Ordinary Shares	102,801	$0.00	0	D

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:

EVP & Chief Comm and Ops Ofcr

	/s/ Mark J. Casey, Attorney-in-Fact	06/21/2022
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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