FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Edwards Larry G.
2. Issuer Name and Ticker or Trading Symbol

TETRAPHASE PHARMACEUTICALS INC [ TTPH ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
Chief Operating Officer
(Last)          (First)          (Middle)

C/O TETRAPHASE PHARMACEUTICALS, INC., 480 ARSENAL WAY
3. Date of Earliest Transaction (MM/DD/YYYY)

1/17/2019
(Street)

WATERTOWN, MA 02472
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   1/6/2019     A   V 4277   A   (1) 32309   D    
Common Stock   5/14/2018     A   V 2058   A   (2) 34367   D    
Common Stock   11/14/2018     A   V 2509   A   (3) 36876   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units     (4) 1/17/2019     A      45000         (5)   (5) Common Stock   45000   $0.00   45000   D    
Restricted Stock Units     (4) 1/17/2019     A      150000         (6)   (6) Common Stock   150000   $0.00   150000   D    

Explanation of Responses:
(1)  On January 6, 2016, the Reporting person was granted 20,000 restricted stock units ("RSUs")( the "2016 RSU grant") that were previously reported on Table II Of Form 4, which form was filed with the Securities and Exchange Commission on March 6, 2018. Of the 2016 RSU grant, 6,666 shares vested on January 6, 2019 of which 2,389 shares were withheld by the Issuer to satisfy the reporting person's tax withholding obligations in connection with the delivery of the conversion of the RSUs into common stock on the vesting date. The total number of shares beneficially owned by the reporting person includes the 4,277 RSUs converted into shares of common stock of the Issuer on the January 2019 vesting date. The RSUs converted into shares of common stock of the Issuer prior to the January 2019 vesting date were previously reported as shares beneficially owned by the reporting person.
(2)  The amount of securities beneficially owned by the reporting person following the transaction reported on this Form 4 reflects the purchase by the reporting person of 2,058 shares of common stock on May 14, 2018 pursuant to the issuer's 2014 Employee Stock Purchase Plan.
(3)  The amount of securities beneficially owned by the reporting person following the transaction reported on this Form 4 reflects the purchase by the reporting person of 2,509 shares of common stock on November 14, 2018 pursuant to the issuer's 2014 Employee Stock Purchase Plan.
(4)  Each restricted stock unit represents a contingent right to receive one share of common stock of Tetraphase Pharmaceuticals, Inc. for no consideration.
(5)  The restricted stock units shall be eligible to vest upon achievement of certain performance conditions and, if such conditions are met, shall vest on various dates beginning no earlier than March 1, 2020 and ending no later than March 1, 2022.
(6)  The restricted stock units vest in three equal installments on each of January 17, 2020, January 17, 2021 and January 17, 2022.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Edwards Larry G.
C/O TETRAPHASE PHARMACEUTICALS, INC.
480 ARSENAL WAY
WATERTOWN, MA 02472


Chief Operating Officer

Signatures
/s/Maria Stahl as Attorney-in-Fact for Larry G. Edwards 1/18/2019
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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