Angelos M. Stergiou - 03 Dec 2025 Form 4 Insider Report for SELLAS Life Sciences Group, Inc. (SLS)

Role: President and CEO, Director
Signature: /s/ Kostantinos Skordalos, Power of Attorney For: Angelos M. Stergiou
Issuer symbol: SLS
Transactions as of: 03 Dec 2025
Net transactions value: -$280,599
Form type: 4
Filing time: 05 Dec 2025, 16:05:13 UTC
Previous filing: 14 Jan 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Stergiou Angelos M.	President and CEO, Director	C/O SELLAS LIFE SCIENCES GROUP, INC.,, 7 TIMES SQUARE, SUITE 2503, NEW YORK	/s/ Kostantinos Skordalos, Power of Attorney For: Angelos M. Stergiou	05 Dec 2025	0001724253

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SLS	Common Stock	Other	$280,599	-187,066	-21%	$1.50	686,966	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.