X0306 4 2016-08-02 0 0001610532 Hortonworks, Inc. HDP 0001626708 Cunitz Herbert C/O HORTONWORKS, INC. 5470 GREAT AMERICA PARKWAY SANTA CLARA CA 95054 0 1 0 0 President Common Stock 2016-08-02 4 A 0 24649 0.00 A 243984 D Common Stock 2016-08-02 4 F 0 7875 12.60 D 236109 D Common Stock 230900 I See Footnote Common Stock 230900 I See Footnote Common Stock 858593 I See Footnote Acquired upon the settlement of performance stock units granted on June 3, 2015 under the Issuer's 2014 Stock Option and Incentive Plan. Withholding of stock to satisfy tax withholding obligations with respect to the settlement of performance stock units referenced in footnote (1). Herbert D. Cunitz and Laura J. Cunitz, Trustees of the Cunitz 2014 Irrevocable Trust fbo Jaclyn L. Cunitz. Herbert D. Cunitz and Laura J. Cunitz, Trustees of the Cunitz 2014 Irrevocable Trust fbo Graham M. Cunitz. Herbert D. Cunitz and Laura J. Cunitz, Trustees of the Herbert D. Cunitz Trust dated March 17, 2000. /s/ David Howard as Attorney-in-Fact for Herbert Cunitz 2016-08-04