X0306 4 2018-06-12 0 0001390478 SELLAS Life Sciences Group, Inc. SLS 0001250316 SCHEINBERG DAVID A C/O SELLAS LIFE SCIENCES GROUP, INC. 315 MADISON AVENUE, 4TH FLOOR NEW YORK NY 10017 1 0 0 0 Stock Option (Right to Buy) 5.23 2018-06-12 4 A 0 5500 0.00 A 2028-06-11 Common Stock 5500 5500 D The shares subject to the option will fully vest on the earlier of (x) June 12, 2019 (the first anniversary of the date of grant) or (y) the day prior to the 2019 annual stockholders meeting, subject to the Reporting Person's continued service on the Issuer's Board of Directors through such date. David Scheinberg, by /s/ Ron A. Metzger, Attorney-in-Fact 2018-06-13