Ownership Submission
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

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
MARIO ERNEST
  2. Issuer Name and Ticker or Trading Symbol
CHIMERIX INC [CMRX]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O CHIMERIX, INC., 2505 MERIDIAN PARKWAY, SUITE 340
3. Date of Earliest Transaction (Month/Day/Year)
08/06/2015
(Street)

DURHAM, NC 27713
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 08/06/2015   M   3,521 A $ 5.05 128,052 D  
Common Stock 08/06/2015   M   750 A $ 23.26 128,802 D  
Common Stock 08/06/2015   M   129 A $ 23.26 128,931 D  
Common Stock 08/06/2015   M   832 A $ 45.15 129,763 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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. SEC 1474 (9-02)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction 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
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(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
Stock Option (Right to Buy) $ 5.05 08/06/2015   M     3,521   (1) 02/03/2023 Common Stock 3,521 $ 0 31,690 D  
Stock Option (Right to Buy) $ 23.26 08/06/2015   M     750   (2) 06/19/2024 Common Stock 750 $ 0 0 D  
Stock Option (Right to Buy) $ 23.26 08/06/2015   M     129   (2) 06/19/2024 Common Stock 129 $ 0 0 D  
Stock Option (Right to Buy) $ 45.15 08/06/2015   M     832   (3) 06/21/2025 Common Stock 832 $ 0 9,151 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
MARIO ERNEST
C/O CHIMERIX, INC.
2505 MERIDIAN PARKWAY, SUITE 340
DURHAM, NC 27713
  X      

Signatures

 /s/ Timothy W. Trost, C.P.A., attorney-in-fact   08/07/2015
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) In accordance with its terms, the shares underlying the option are subject to vesting as follows: the shares vest at a rate of 1/48th per month during the four years following February 4, 2013.
(2) The shares subject to the option vest in a series of twelve equal monthly installments from the date of grant on June 20, 2014 such that the option is fully vested on the one-year anniversary of the date of the grant.
(3) The shares subject to the option vest in twelve equal monthly installments from the date of grant such that the option is fully vested on the one-year anniversary of the date of the grant.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.