X0306 4 2017-02-16 0 0001264587 STEMLINE THERAPEUTICS INC STML 0001573722 Hoberman Kenneth C/O STEMLINE THERAPEUTICS, INC. 750 LEXINGTON AVENUE, ELEVENTH FLOOR NEW YORK NY 10022 0 1 0 0 Chief Operating Officer Common Stock 2017-02-16 4 S 0 1508 6.42 D 287682 D In connection with the vesting of 3,746 shares on February 14, 2017, a total of 1,508 of such shares were withheld by the Company in order to satisfy the reporting person's tax withholding obligations. The reporting person had no discretion with respect to such action, which was conducted automatically in accordance with the issuer's corporate policies. Reflects the weighted average sale price. The range of prices for such transaction is $6.35 to $6.50. The reporting person effected multiple same-way open market sale transactions on the same day at different prices through a trade order executed by a broker-dealer. The reporting person reported on a single line all such transactions that occurred within a one dollar price range. The reporting person hereby undertakes to provide upon request by the Securities Exchange Commission staff, the issuer, or a shareholder of the issuer, full information regarding the number of shares sold at each separate price. Of the 287,682 shares, 235,015 shares are restricted stock. /s/ Kenneth Hoberman 2017-02-17