Katherine Bach Kalin - 19 Nov 2025 Form 4 Insider Report for SELLAS Life Sciences Group, Inc. (SLS)

Role: Director
Signature: /s/ Kostantinos Skordalos, Power of Attorney For: Katherine Bach Kalin
Issuer symbol: SLS
Transactions as of: 19 Nov 2025
Net transactions value: +$100,806
Form type: 4
Filing time: 21 Nov 2025, 08:45:10 UTC
Previous filing: 22 May 2025
Next filing: 09 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Kalin Katherine Bach	Director	C/O SELLAS LIFE SCIENCES GROUP, INC., 7, TIMES SQUARE, SUITE 2503, NEW YORK	/s/ Kostantinos Skordalos, Power of Attorney For: Katherine Bach Kalin	21 Nov 2025	0001832671

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SLS	Common Stock	Purchase	$100,806	+63,400	+155%	$1.59	104,400	19 Nov 2025	Direct	F1

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

Explanation of Responses:

Id	Content
F1	The price reflects the weighted average purchase price of the shares of common stock purchased. These shares of common stock were purchased in multiple transactions at prices ranging from $1.555 to $1.625 per share. Ms. Kalin undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer, full information regarding the number of shares of common stock purchased at each price.

Content

The price reflects the weighted average purchase price of the shares of common stock purchased. These shares of common stock were purchased in multiple transactions at prices ranging from $1.555 to $1.625 per share. Ms. Kalin undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer, full information regarding the number of shares of common stock purchased at each price.