0001140361-17-028774.txt : 20170726 0001140361-17-028774.hdr.sgml : 20170726 20170726184136 ACCESSION NUMBER: 0001140361-17-028774 CONFORMED SUBMISSION TYPE: 3 PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20170726 FILED AS OF DATE: 20170726 DATE AS OF CHANGE: 20170726 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: MAST ERLE T CENTRAL INDEX KEY: 0001051411 FILING VALUES: FORM TYPE: 3 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38155 FILM NUMBER: 17984003 MAIL ADDRESS: STREET 1: C/O SPIROS DEVELOPMENT CORP II INC STREET 2: 7475 LUSK BLVD CITY: SAN DIEGO STATE: CA ZIP: 92121 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: Sienna Biopharmaceuticals, Inc. CENTRAL INDEX KEY: 0001656328 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] IRS NUMBER: 273364627 STATE OF INCORPORATION: DE FISCAL YEAR END: 0630 BUSINESS ADDRESS: STREET 1: 30699 RUSSELL RANCH ROAD, SUITE 140 CITY: WESTLAKE VILLAGE STATE: CA ZIP: 91362 BUSINESS PHONE: (818) 629-2256 MAIL ADDRESS: STREET 1: 30699 RUSSELL RANCH ROAD, SUITE 140 CITY: WESTLAKE VILLAGE STATE: CA ZIP: 91362 FORMER COMPANY: FORMER CONFORMED NAME: Sienna Labs, Inc. DATE OF NAME CHANGE: 20151020 3 1 doc1.xml FORM 3 X0206 3 2017-07-26 0 0001656328 Sienna Biopharmaceuticals, Inc. SNNA 0001051411 MAST ERLE T C/O SIENNA BIOPHARMACEUTICALS, INC. 30699 RUSSELL RANCH ROAD, SUITE 140 WESTLAKE VILLAGE CA 91362 1 0 0 0 Stock Option (Right to Buy) 11.04 2027-06-14 Common Stock 28666 D The shares subject to the option vest and become exercisable as to 1/3 of the shares on each annual anniversary of May 3, 2017, subject to the Reporting Person's continued employment or service relationship with the Issuer on each such vesting date. /s/ Timothy K. Andrews, attorney-in-fact for Erle T. Mast 2017-07-26 EX-24.1 2 poa_mast.htm
Sienna Biopharmaceuticals, Inc.

Power of Attorney

 
Know all by these presents, that the undersigned hereby constitutes and appoints each of (i) the Chief Executive Officer of Sienna Biopharmaceuticals, Inc., a Delaware corporation (the "Company"), who is currently Frederick C. Beddingfield III, (ii) the Company's Chief Financial Officer, who is currently Richard Peterson, and (iii) the Company's General Counsel, who is currently Timothy K. Andrews, and their respective successors (including anyone serving in such capacities on an interim or acting basis), signing singly, with full powers of substitution, as the undersigned's true and lawful attorney-in-fact to:
 
1.
 
prepare, execute in the undersigned's name and on the undersigned's behalf, and submit to the U.S. Securities and Exchange Commission (the "SEC") a Form ID, including amendments thereto, and any other documents necessary or appropriate to obtain codes and passwords enabling the undersigned to make electronic filings with the SEC of reports required by Section 16(a) of the Securities Exchange Act of 1934 or any rule or regulation of the SEC;
 
2.
 
execute for and on behalf of the undersigned, in the undersigned's capacity as an officer and/or director of the Company, Forms 3, 4, and 5 and any amendments thereto in accordance with Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder;
 
3.
 
do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form 3, 4, or 5, complete and execute any amendment or amendments thereto, and timely file such form with the SEC and any stock exchange or similar authority; and
 
4.
 
take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact's discretion.
 
The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted. The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned's responsibilities to comply with Section 16 of the Securities Exchange Act of 1934.
 
This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4, and 5 with respect to the undersigned's holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.
 
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 18th day of July, 2017.
 
/s/ Erle T. Mast                    
By: Erle T. Mast