Stemline Therapeutics Added to Russell 3000(R) Index

Stemline Therapeutics

, a clinical-stage biopharmaceutical company developing novel oncology therapeutics that target both cancer stem cells (CSCs) as well as the tumor bulk, announced today that it has been added to the Russell 3000® Index, effective prior to the market open on Monday, July 1, 2013. Annual reconstitution of Russell's U.S. indexes captures the 4,000 largest U.S. stocks as of the end of May, ranking them by total market capitalization. Membership in the Russell 3000® Index, which remains in place for one year, will signify automatic inclusion in the large-cap Russell 1000® Index or small-cap Russell 2000® Index as well as the appropriate growth and value style indexes. Russell determines membership for its equity indexes primarily by objective, market capitalization rankings and style attributes. Russell indexes are widely used by investment managers and institutional investors for index funds and as benchmarks for both passive and active investment strategies. Approximately $4.1 trillion in assets are benchmarked to the Russell Indexes. About Stemline Therapeutics, Inc. Stemline Therapeutics, Inc. is a clinical-stage biopharmaceutical company developing novel oncology therapeutics that target both cancer stem cells (CSCs) as well as the tumor bulk. Stemline's clinical candidates, SL-401 and SL-701, have demonstrated clinical activity, including durable complete responses (CRs), in Phase 1/2 studies of patients with advanced hematological and brain cancer, respectively. For more information about Stemline Therapeutics, visit www.stemline.com. The information in our website is not incorporated by reference into this press release and is included as an inactive textual reference only. Forward-looking statements: Some of the statements included in this press release may be forward-looking statements that involve a number of risks and uncertainties. For those statements, we claim the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995. The factors that could cause our actual results to differ materially are identified from time to time in our reports filed with the Securities and Exchange Commission. Any forward-looking statements set forth in this press release speak only as of the date of this press release. We do not intend to update any of these forward-looking statements to reflect events or circumstances that occur after the date hereof.