Stephanie Kenney - 26 Feb 2026 Form 3 Insider Report for Atrium Therapeutics, Inc.

Role: Chief Corporate Affairs Officer Exhibit List - Exhibit 24.1 Power of Attorney
Signature: /s/ Adam Grajewski, Attorney-in-Fact
Issuer symbol: N/A
Transactions as of: 26 Feb 2026
Net transactions value: $0
Form type: 3
Filing time: 26 Feb 2026, 18:20:25 UTC
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Kenney Stephanie	Chief Corporate Affairs Officer Exhibit List - Exhibit 24.1 Power of Attorney	C/O ATRIUM THERAPEUTICS, INC., 10578 SCIENCE CENTER DRIVE, SUITE 125, SAN DIEGO	/s/ Adam Grajewski, Attorney-in-Fact	26 Feb 2026	0002105422

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding		Common Stock						5,460	26 Feb 2026	Direct

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

Remarks:

Chief Corporate Affairs Officer Exhibit List - Exhibit 24.1 Power of Attorney