SELLAS Life Sciences to be Added to Russell 3000® and Russell 2000® Indexes

Company Overview - SELLAS Life Sciences Group, Inc. is a late-stage clinical biopharmaceutical company focused on developing novel therapies for various cancer indications [5] - The lead product candidate, GPS, targets the WT1 protein and has potential applications in both hematologic malignancies and solid tumors [5] - The company is also developing SLS009 (tambiciclib), a differentiated small molecule CDK9 inhibitor with reduced toxicity and increased potency compared to existing CDK9 inhibitors [5] Index Inclusion - SELLAS will be added to the Russell 3000 and Russell 2000 Indexes, effective after the U.S. market close on June 27, 2025, as part of the 2025 Russell indexes annual reconstitution [1] - Membership in these indexes lasts for one year and results in automatic inclusion in appropriate growth and value style indexes, enhancing visibility with institutional investors [3] Strategic Importance - The inclusion in the Russell indexes is seen as a significant corporate milestone, reflecting the company's progress in advancing its pipeline and building long-term shareholder value [4] - The company is approaching the readout of full topline Phase 2 data of SLS009 in acute myeloid leukemia (AML) and the final analysis of the Phase 3 pivotal REGAL trial of GPS in AML [4]