X0306 4/A 2015-04-27 2015-04-29 0 0001610532 Hortonworks, Inc. HDP 0001565530 Gnau Scott E C/O HORTONWORKS, INC. 5470 GREAT AMERICA PARKWAY SANTA CLARA CA 95054 0 1 0 0 Chief Technology Officer Restricted Stock Units 2015-04-27 4 A 0 44082 0.00 A Common Stock 44082 44082 D Each restricted stock unit represents the right to receive, at settlement, one share of common stock. On April 27, 2015 (the "Grant Date"), the Reporting Person was granted 36,379 restricted stock units ("RSUs"). On August 10, 2015, the Reporting Person's original grant was corrected by the Compensation Committee to reflect an additional 7,703 shares. The restricted stock units vest with respect to 50% on the first anniversary of the Grant Date, an additional 25% will become vested on the eighteen (18) month anniversary of the Grant Date and the remaining 25% will become vested on the twenty-four (24) month anniversary of the Grant Date. We are amending the original Form 4 to reflect the correct number of RSUs granted. /s/ David Howard as Attorney-in-Fact for Scott Gnau 2015-09-04