13G Filing: Park West Asset Management and Sientra, Inc. (SIEN)

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CUSIP No. 82621J105
(1)	Names of Reporting Persons Peter S. Park
(2)	Check the Appropriate Box if a Member of a Group (See Instructions)	(a) ¨ (b) ¨
(3)	SEC Use Only
(4)	Citizenship or Place of Organization United States of America

* Beneficial ownership percentage is based upon 17,993,416 shares of common stock, $0.01 par value per share (“Common Stock”), of Sientra, Inc., a Delaware corporation (the “Company”), issued and outstanding as of November  9, 2015, based on information reported by the Company in its Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2015, filed with the Securities and Exchange Commission on November 16, 2015.  Park West Asset Management LLC (“PWAM”) is the investment manager to Park West Investors Master Fund, Limited, a Cayman Islands exempted company (“PWIMF”), and Park West Partners International, Limited, a Cayman Islands exempted company (“PWPI” and, collectively with PWIMF, the “PW Funds”), and Peter S. Park (“Mr. Park” and, collectively with PWAM, the “Reporting Persons”) is the sole member and manager of PWAM.  As of January 12, 2016, PWIMF held 794,819 shares of Common Stock and PWPI held 109,781 shares of Common Stock of the Company.  As a result of the foregoing, for purposes of Reg. Section 240.13d-3, the Reporting Persons may be deemed to beneficially own the 904,600 shares of Common Stock held in the aggregate by the PW Funds, or 5.0% of the shares of Common Stock deemed to be issued and outstanding as of January 12, 2016.