SCHEDULE Filed 2025-03-17 Event 2025-03-13 SEC 0000899140-25-000425 →

Hein Park Capital Management LP → Mallinckrodt plc

Stake: 9.69% Shares: 1,914,673 CUSIP: G5890A102 Class: Common Stock, par value $0.01 per share

Composite Decision Signal · PASS (LOW BASE-RATE EDGE) Conviction Score: 10/100 · Filer 90d Win Rate: 100% · Hist. 90d Edge: +25.3%

Passive Schedule 13G filer baseline
High conviction ownership stake (9.7%)

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

11 transactions

8 buys · 1 sales · 1 awards/exercises

Issuer Cluster

20 13D/G filings on this issuer

19 other filings besides this one

Filer Track Record

3 filings by this filer

2 other filings in the data moat

Short Interest

—

Not in latest FINRA snapshot

Form 4 Insider Transactions · last 365d

Date	Insider	Role	Type	Shares	Price	Value
2026-07-15	Langlois Sophia J.	director	Award	4,406	—	—
2026-07-15	Yoskowitz Marc J	director	Award	4,406	—	—
2026-07-15	Hirsch Scott	director	Award	4,406	—	—
2026-07-15	Zinman Jon	director	Award	4,406	—	—
2026-07-15	Efron Paul	director	Award	4,406	—	—
2026-07-15	Donato Leslie E	director	Award	4,406	—	—
2026-07-15	Dorton Katina	director	Award	4,406	—	—
2026-07-15	Bisaro Paul	director	Award	4,406	—	—
2026-06-02	Donato Leslie E	director	Option exercise	2,685	—	—
2026-06-02	Donato Leslie E	director	F	619	—	—
2026-06-02	Donato Leslie E	director	Disposition	2,197	—	—

Other 13D/G Filings on Mallinckrodt plc

Filed	Form	Filer	Stake	Shares
2026-10-06	SCHEDULE 13D/A	GOLDENTREE ASSET MANAGEMENT LP	—	8,389,212	view →
2026-05-22	SCHEDULE 13D/A	Silver Point Capital L.P.	15.20%	6,035,214	view →
2024-07-08	SC	Silver Point Capital L.P.	—	—	view →
2024-04-08	SC	Hein Park Capital Management LP	—	—	view →
2024-01-22	SC	Silver Point Capital L.P.	—	—	view →
2022-02-24	SC	Buxton Helmsley Group, Inc.	—	—	view →
2022-02-11	SC	Buxton Helmsley Group, Inc.	—	—	view →
2022-02-01	SC	Buxton Helmsley Group, Inc.	—	—	view →
2022-01-26	SC	Buxton Helmsley Group, Inc.	—	—	view →
2022-01-24	SC	Buxton Helmsley Group, Inc.	—	—	view →
2021-11-12	SC	Buxton Helmsley Group, Inc.	—	—	view →
2021-11-05	SC	Buxton Helmsley Group, Inc.	—	—	view →
2021-10-22	SC	Buxton Helmsley Group, Inc.	—	—	view →
2021-10-15	SC	Buxton Helmsley Group, Inc.	—	—	view →
2021-09-15	SC	Buxton Helmsley Group, Inc.	—	—	view →
2021-08-17	SC	Buxton Helmsley Group, Inc.	—	—	view →
2021-08-05	SC	Buxton Helmsley Group, Inc.	—	—	view →
2021-08-03	SC	Buxton Helmsley Group, Inc.	—	—	view →
2021-03-10	SC	Buxton Helmsley Group, Inc.	—	—	view →

Other Filings by Hein Park Capital Management LP

Filed	Form	Issuer	Stake	Shares
2025-05-19	SCHEDULE	DIEBOLD NIXDORF, Inc DBD	4.14%	1,542,511	view →
2024-04-08	SC	Mallinckrodt plc	—	—	view →

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