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
X	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
	Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person* Hussain Abbas (Last) (First) (Middle) 675 MCDONNELL BLVD. (Street) HAZELWOOD MO 63042 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol Mallinckrodt plc [ NONE ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 07/31/2025
	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	07/31/2025		M		12,036	A	(1)	13,216	D
Ordinary Shares	07/31/2025		F		3,433	D	(2)	9,783	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
Restricted Stock Units	(3)	07/31/2025		A		16,414		(3)	(3)	Ordinary Shares	16,414	$0.00	21,886	D
Restricted Stock Units	(4)	07/31/2025		D			9,850	(4)	(4)	Ordinary Shares	9,850	(5)	12,036	D
Restricted Stock Units	(1)	07/31/2025		M			12,036	(1)	(1)	Ordinary Shares	12,036	$0.00	0	D

Explanation of Responses:

1. On July 31, 2025, pursuant to the Transaction Agreement, dated as of March 13, 2025 (as amended, the "Transaction Agreement"), by and among Mallinckrodt plc (the "Issuer"), Endo, Inc. ("Endo") and Salvare Merger Sub LLC, the Issuer's wholly owned subsidiary ("Merger Sub"), the Merger Sub merged with and into Endo (the "Business Combination"), with Endo surviving the Business Combination as a wholly owned subsidiary of the Issuer. Upon the reporting person's resignation as a director of the Issuer, effective as of immediately following the Merger Effective Time (as defined in the Transaction Agreement), each restricted unit (the "RSU") held by the reporting person automatically settled in ordinary shares of the Issuer at one share per RSU.

2. The number of ordinary shares withheld to satisfy tax withholding obligations arising out of the vesting of RSUs is based on a percentage and did not take into account any market value as the Issuer's ordinary shares are not listed or quoted on a recognized trading market.

3. Upon consummation of the Business Combination, each performance unit ("PSU") held by the reporting person automatically converted into an RSU.

4. The reporting person entered into an agreement with the Issuer pursuant to which the reporting person forfeited the right to receive 9,850 RSUs that would otherwise have vested in exchange for a payment from the Issuer to facilitate the reporting person's ability to satisfy certain tax obligations related to the RSUs scheduled to vest.

5. The number of RSUs forfeited is based on a percentage.

Remarks:

This Form 4 constitutes a notice to the Issuer for purposes of Part V of the Companies Act 2014.

	/s/ Mark Tyndall, Attorney-in-Fact	08/04/2025
	** Signature of Reporting Person	Date
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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