X0306 4 2019-03-14 0 0001390478 SELLAS Life Sciences Group, Inc. SLS 0001220051 WOOD BARBARA A C/O SELLAS LIFE SCIENCES GROUP, INC. 15 WEST 38TH STREET, 10TH FLOOR NEW YORK NY 10018 0 1 0 0 EVP, Gen. Counsel, Corp. Sec. Stock Option (Right to Buy) 1.38 2019-03-14 4 A 0 165000 0.00 A 2029-03-14 Common Stock 165000 165000 D One-quarter (1/4) of the option shares will vest and became exercisable one year from the March 14, 2019 grant date, and the remainder will vest and become exercisable in equal monthly installments for thirty-six (36) months thereafter, provided that the Reporting Person remains in service with the Issuer through each such monthly vesting date. Exhibit List: Exhibit 24 - Power of Attorney /s/ Barbara A. Wood 2019-03-18