X0306 4 2015-08-25 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 2015-08-25 4 S 0 750 23.85 D 243250 I See Footnote Common Stock 2015-08-25 4 S 0 750 23.85 D 243250 I See Footnote Common Stock 2015-08-25 4 S 0 750 23.85 D 870943 I See Footnote Common Stock 2015-08-26 4 S 0 750 23.06 D 242500 I See Footnote Common Stock 2015-08-26 4 S 0 750 23.06 D 242500 I See Footnote Common Stock 2015-08-26 4 S 0 750 23.06 D 870193 I See Footnote Represents the weighted average sale price for the entire number of shares sold. The sale prices range from $23.32 to $24.30 per share. The reporting person undertakes to provide to the staff of the SEC, the Issuer, or a stockholder of the Issuer, upon request, the number of shares purchased by the reporting person at each separate price within the range. Represents the weighted average sale price for the entire number of shares sold. The sale prices range from $22.78 to $23.31 per share. The reporting person undertakes to provide to the staff of the SEC, the Issuer, or a stockholder of the Issuer, upon request, the number of shares purchased by the reporting person at each separate price within the range. These transactions were executed pursuant to a 10b5-1 trading plan executed on March 8, 2015 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 2015-08-27