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

Page 2 of 5 SEC Filing

CUSIP No. 82621J105
Names of Reporting Persons
Park West Asset Management LLC

Check the Appropriate Box if a Member of a Group (See Instructions) 
(a) ¨
(b) ¨
SEC Use Only
Citizenship or Place of Organization
Number of Shares Beneficially Owned by
Each Reporting Person With:
(5) Sole Voting Power                                                               

(6) Shared Voting Power                        
(7) Sole Dispositive Power               
(8) Shared Dispositive Power                        
Aggregate Amount Beneficially Owned by Each Reporting Person
Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions):             ¨
Percent of Class Represented by Amount in Row (9)
Type of Reporting Person (See Instructions)
* 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.
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