SEC FORM 3

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Efron Paul

(Last)

(First)

(Middle)

675 MCDONNELL BLVD.

(Street)

HAZELWOOD

63042

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
07/31/2025

3. Issuer Name and Ticker or Trading Symbol
Mallinckrodt plc [ NONE ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
	Officer (give title below)	Other (specify below)

5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Ordinary Shares	773⁽¹⁾⁽²⁾	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)

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. At the Merger Effective Time (as defined in the Transaction Agreement), each share of Endo common stock held by the reporting person immediately prior to the Merger Effective Time automatically converted into the right to receive approximately $1.31 in cash and 0.2575 ordinary shares of the Issuer without interest and subject to applicable withholding. The securities reported herein were acquired by the reporting person prior to the reporting person becoming a director of the Issuer.

2. The reporting person became a director of the Issuer immediately following the effective time of the Business Combination.

Remarks:

Exhibit 24 - Power of Attorney. This Form 3 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 5 (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.