X0306 4 2013-04-24 0 0001264587 STEMLINE THERAPEUTICS INC STML 0001318886 Rowinsky Eric K C/O STEMLINE THERAPEUTICS, INC. 750 LEXINGTON AVENUE, SIXTH FLOOR NEW YORK NY 10022 0 1 0 0 Chief Medical Officer Common Stock 2013-04-24 4 A 0 149614 0 A 149614 D Common Stock 2013-08-01 4 F 0 6745 27.88 D 143869 D Represents a grant of 149,614 shares of restricted stock, of which 12,476 shares will vest on the first anniversary of the grant date and 24,934 shares will vest on each of the second through fifth anniversaries of the grant date, contingent on the reporting person's continuous service. 18,701 shares vested on August 1, 2013, when the Company's achievement of a 60-day average market capitalization of $250 million, and 18,701 shares will vest if and when the Company achieves a 30-day average market capitalization of $500 million. In connection with the vesting of 18,701 shares on August 1, 2013, a total of 6,745 of such shares were withheld by the Company in order to satisfy the reporting person's tax withholding obligations. Mr. Rowinsky had no discretion with respect to such sale, which was withheld automatically in accordance with the issuer's corporate policies regarding the vesting of restricted stock. /s/ Kenneth Hoberman, Attorney-in-Fact 2013-08-05