X0306 4 2018-05-23 0 0001610532 Hortonworks, Inc. HDP 0001626464 Volpi Michelangelo C/O HORTONWORKS, INC. 5470 GREAT AMERICA PARKWAY SANTA CLARA CA 95054 1 0 0 0 Common Stock 2018-05-23 4 A 0 9765 0.00 A 20603 D Common Stock 1126749 I By Index Ventures V (Jersey), L.P. Common Stock 9128 I By Index Ventures V Parallel Entrepreneur Fund (Jersey), L.P. Common Stock 1042132 I By Index Ventures IV (Jersey), L.P. Common Stock 100332 I By Index Ventures IV Parallel Entrepreneur Fund (Jersey), L.P. Common Stock 23578 I By Yucca (Jersey) SLP Exempt grant of restricted stock units under the Issuer's Amended and Restated 2014 Stock Option and Incentive Plan. The units will vest and settle for shares of common stock of the Issuer on May 23, 2019, subject to the Reporting Person's continuous service as a board member through such date. Unvested shares are subject to acceleration upon the occurrence of certain events. The Reporting Person is a partner within the Index Ventures group. Advisors within the Index Ventures group provide advice to Index Ventures IV (Jersey), L.P., Index Ventures IV Parallel Entrepreneur Fund (Jersey), L.P., Index Ventures V (Jersey), L.P., Index Ventures V Parallel Entrepreneur Fund (Jersey), L.P. and Yucca (Jersey) SLP (the "Index Funds"). The Reporting Person is involved in making recommendations to the Index Funds, but does not hold voting or dispositive power over the shares held by the Index Funds. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose. /s/ David Howard as Attorney-in-Fact for Michelangelo Volpi 2018-05-25