Sientra (SIENQ) DEFA14A Additional proxy soliciting materials

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.    )

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☐	Preliminary Proxy Statement
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☐	Soliciting Material under §240.14a-12

Sientra, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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Your Vote Counts! SIENTRA, INC. 2021 Annual Meeting Vote by June 09, 2021 11:59 PM ET. For shares held in a Plan, vote by June 07, 2021 11:59 PM ET. SIENTRA, INC. 420 S. FAIRVIEW AVE., SUITE 200 1 SANTA BARBARA, CA 93117 148,294 322,224OF 2 Ricky Campana P.O. Box 123456 Suite 500 30# 51 Mercedes Way Edgewood, NY 11717 FLASHID-JOB# You invested in SIENTRA, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on June 10, 2021. Get informed before you vote View the Notice & of Proxy oxy Statement, Form Annual 10-K Report,1234 5678901 2345678901 2345678901234567890, online OR you can receive a free paper or email copy of the 123456789012345678 material(s) by requesting prior 9012345678901234567890, to May 27, 2021. If you would 1234567890123456789012345678901234567890, like to request a copy of the material(s) for this 12345678901234567890123456789012345 and/or future stockholder meetings, you may (1) visit 67890 www. online ProxyVote. OR youcom, can receive (2) call a 1-800-579-1639 free paper copy or of (3) voting send material(s) an email to by sendmaterial@proxyvote. equesting prior to <matcutoff>. com. If sending If you wou an email, d ke please to request include your a copy control of the number voting (indicated material(s), below) you may in the (1) subject visit www. line. Unless ProxyVote. requested, com, (2) you call will 1-800-579-1639 not otherwise receive or (3) a send paper an or email email to sendmaterial@proxyvote. copy. com. If sending an email, please include your control number (indicated below) in the subject line. For complete information and to vote, visit www.ProxyVote.com Control # XXXX XXXX XXXX XXXX Smartphone users Vote Virtually at the Meeting* Point your camera here and June 10, 2021 vote without entering a 9:00 AM PDT control number Virtually at: www.virtualshareholdermeeting.com/SIEN2021 *Please check the meeting materials for any special requirements for meeting attendance.

Vote at www.ProxyVote.com Control # XXXX XXXX XXXX XXXX THIS IS NOT A VOTABLE BALLOT SHARE CLASSES REPRESENTED FOR VOTING THE COMPANY NAME INC.—COMMON ASDFGHJKL 123456789.1234 THE COMPANY NAME INC.—CLASS A 123456789.1234 This is an overview of the proposals being presented at the THE COMPANY NAME INC.—CLASS B 123456789.1234 upcoming stockholder shareholder meeting. Please follow the instructions on THE COMPANY NAME INC.—CLASS C 123456789.1234 THE COMPANY NAME INC.—CLASS D 123456789.1234 the reverse side to vote these important matters. THE COMPANY NAME INC.—CLASS E 123456789.1234 THE COMPANY NAME INC.—CLASS F 123456789.1234 THE COMPANY NAME INC.—401 K 123456789.1234 Voting Items Board Recommends 1. Election of Directors Nominees: For 01) Ronald Menezes 02) Philippe A. Schaison 03) Keith J. Sullivan 2. To ratify the selection by the Audit Committee of the Board of Directors of KPMG LLP as the independent registered For public accounting firm of Sientra, Inc. for its fiscal year ending December 31, 2021. 3. To approve, on a non-binding advisory basis, of the compensation of our Named Executive Officers as disclosed in For the Proxy Statement (“Say-On-Pay Vote”). NOTE: Such other business as may properly come before the meeting or any adjournment thereof. Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Sign up for E-delivery”.