Christiana Stamoulis - 23 Sep 2025 Form 4 Insider Report for Mallinckrodt plc

Role: President and CFO
Signature: /s/ Mark Tyndall, Attorney-in-Fact
Issuer symbol: N/A
Transactions as of: 23 Sep 2025
Net transactions value: $0
Form type: 4
Filing time: 25 Sep 2025, 18:01:24 UTC
Previous filing: 25 Sep 2025
Next filing: 22 Oct 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Stamoulis Christiana	President and CFO	675 MCDONNELL BLVD., HAZELWOOD	/s/ Mark Tyndall, Attorney-in-Fact	25 Sep 2025	0001502917

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction		Restricted Stock Units	Award	$0	+91,007		$0.000000	91,007	23 Sep 2025	Ordinary Shares	91,007		Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Upon vesting, each Restricted Stock Unit ("RSU") will be settled in ordinary shares of the Issuer at one share per RSU.
F2	The RSUs will vest ratably on each of December 15, 2025, December 15, 2026 and December 15, 2027, subject to the Reporting Person's continued service through such date.

Remarks:

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