X0306 4 2017-06-22 0 0001551693 Sientra, Inc. SIEN 0001431403 Simon Nicholas C/O 420 SOUTH FAIRVIEW, SUITE 200 SANTA BARBARA CA 93117 1 0 1 0 Common Stock 2017-06-22 4 A 0 12861 9.72 A 31546 D Common Stock 2730765 I See Note The common stock underlying this grant of restricted stock will vest on the earlier to occur of: (i) day prior to the annual meeting of stockholders for the year following the date of grant, or (ii) the one-year anniversary of the annual meeting of stockholders of the year of grant, subject to continued service as a director. Consists of 2,730,765 shares held of record by Clarus Lifesciences I, L.P., or Clarus I. Clarus Ventures I Management, L.P.,or Clarus I GPLP, is the sole general partner of Clarus I. Clarus Ventures I, LLC, or Clarus I GPLLC, is the sole general partner of Clarus I GPLP. Mr. Simon is a managing director of Clarus I GPLLC and may be deemed to beneficially own certain of the shares held of record by Clarus I. Mr. Simon disclaims beneficial ownership of all shares held of record by Clarus I, except to the extent of his pecuniary interest therein. /s/ Nicholas Simon 2017-06-26