DRAGAN CICIC - 03 Dec 2025 Form 4 Insider Report for SELLAS Life Sciences Group, Inc. (SLS)

Role: SVP, Chief Development Officer
Signature: /s/ Kostantinos Skordalos, Power of Attorney For: Dragan Cicic
Issuer symbol: SLS
Transactions as of: 03 Dec 2025
Net transactions value: -$95,700
Form type: 4
Filing time: 05 Dec 2025, 16:07:39 UTC
Previous filing: 14 Jan 2025
Next filing: 09 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
CICIC DRAGAN	SVP, Chief Development Officer	C/O SELLAS LIFE SCIENCES GROUP, INC.,, 7 TIMES SQUARE, SUITE 2503, NEW YORK	/s/ Kostantinos Skordalos, Power of Attorney For: Dragan Cicic	05 Dec 2025	0001565795

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SLS	Common Stock	Other	$95,700	-63,800	-20%	$1.50	257,805	03 Dec 2025	Direct	F1, F2

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

Explanation of Responses:

Id	Content
F1	Transaction relates to shares of common stock withheld by the SELLAS Life Sciences Group, Inc. (the "Issuer") to cover tax withholding obligations of the Reporting Person in connection with the vesting of Restricted Stock Units ("RSUs").
F2	Represents the number shares of common stock withheld by the Issuer to cover tax withholding obligations of the Reporting Person in connection with the vesting of RSUs.