Kathleen P. Gallagher - 26 Feb 2026 Form 3 Insider Report for Atrium Therapeutics, Inc.

Role: Chief Executive Officer and President Exhibit List - Exhibit 24.1 Power of Attorney, Director
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, 18:13:09 UTC
Previous filing: 19 Dec 2025
Next filing: 27 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Gallagher Kathleen P.	Chief Executive Officer and President Exhibit List - Exhibit 24.1 Power of Attorney, Director	C/O ATRIUM THERAPEUTICS, INC., 10578 SCIENCE CENTER DRIVE, SUITE 125, SAN DIEGO	/s/ Adam Grajewski, Attorney-in-Fact	26 Feb 2026	0002048409

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding		Common Stock						28,861	26 Feb 2026	Direct

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

Remarks:

Chief Executive Officer and President Exhibit List - Exhibit 24.1 Power of Attorney