Ownership Submission
FORM 3
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Pigeon Matthew
2. Date of Event Requiring Statement (Month/Day/Year)
10/28/2014
3. Issuer Name and Ticker or Trading Symbol
Sientra, Inc. [SIEN]
(Last)
(First)
(Middle)
420 SOUTH FAIRVIEW,, SUITE 200
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
CFO and Treasurer
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

SANTA BARBARA, CA 93117
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (right to buy)   (1) 12/31/2019 Common Stock 71,090 $ 2.338 D  
Employee Stock Option (right to buy)   (2) 04/18/2022 Common Stock 38,000 $ 3.988 D  
Employee Stock Option (right to buy)   (3) 04/24/2024 Common Stock 7,272 $ 11 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Pigeon Matthew
420 SOUTH FAIRVIEW,
SUITE 200
SANTA BARBARA, CA 93117
      CFO and Treasurer  

Signatures

/s/ Joel Smith, Attorney-in-fact for Matthew Pigeon 10/28/2014
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) This stock option is fully vested.
(2) This stock option vests as follows: 1/4 vested on March 9, 2013 with the balance vesting in approximately equal installments on the last day of each full month following March 9, 2013 through February 29, 2016.
(3) This stock option vests as follows: 1/4 vesting on January 1, 2015 with the balance vesting in approximately equal installments on the last day of each full month following January 1, 2015 through December 31, 2017.
 
Remarks:
Exhibit 24- Power of Attorney for Matthew Pigeon.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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