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

CUSIP No. 82621J105
(1)	Names of Reporting Persons Park West Asset Management LLC
(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 Delaware

Number of Shares Beneficially Owned by Each Reporting Person With:	(5) Sole Voting Power	904,600*
	(6) Shared Voting Power	0
	(7) Sole Dispositive Power	904,600*
	(8) Shared Dispositive Power	0

(9)	Aggregate Amount Beneficially Owned by Each Reporting Person 904,600*
(10)	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions): ¨
(11)	Percent of Class Represented by Amount in Row (9) 5.0%*
(12)	Type of Reporting Person (See Instructions) IA

* 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.

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

Published on January 24, 2016 at 3:52 pm by Meena Krishnamsetty in Hedge Funds, News

Page 2 of 5 SEC Filing

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