David J. Stetson - Jul 31, 2025 Form 4 Insider Report for Mallinckrodt plc

Role
Director
Signature
/s/ Mark Tyndall, Attorney-in-Fact
Transactions as of
Jul 31, 2025
Transactions value $
$0
Form type
4
Date filed
8/4/2025, 08:49 PM
Previous filing
Jan 2, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Stetson David J. Director 675 MCDONNELL BLVD., HAZELWOOD /s/ Mark Tyndall, Attorney-in-Fact 2025-08-04 0001757529

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction Ordinary Shares Options Exercise +12K +440.07% 14.8K Jul 31, 2025 Direct F1
transaction Ordinary Shares Tax liability -3.19K -21.62% 11.6K Jul 31, 2025 Direct F2

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 +16.4K +299.96% $0.00 21.9K Jul 31, 2025 Ordinary Shares 16.4K Direct F3
transaction Restricted Stock Units Disposed to Issuer -9.85K -45.01% 12K Jul 31, 2025 Ordinary Shares 9.85K Direct F4, F5
transaction Restricted Stock Units Options Exercise $0 -12K -100% $0.00 0 Jul 31, 2025 Ordinary Shares 12K Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

David J. Stetson is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may continue.

Explanation of Responses:

Id Content
F1 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.
F2 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.
F3 Upon consummation of the Business Combination, each performance unit ("PSU") held by the reporting person automatically converted into an RSU.
F4 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.
F5 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.