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
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Morgan Bradley Paul
   2. Issuer Name and Ticker or Trading Symbol
CYTOKINETICS INC [CYTK] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
SVP Drug Discovery & Early Dev
(Last)
(First)
(Middle)
280 EAST GRAND AVENUE		 3. Date of Earliest Transaction (Month/Day/Year)
08/31/2017
(Street)

SOUTH SAN FRANCISCO, CA 94080		 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 08/31/2017   M(1)   16,666 A $ 6.67 63,107 D  
Common Stock 08/31/2017   S(2)   16,666 D $ 15 46,441 D  
Common Stock 08/31/2017   M(1)   15,206 A $ 7.96 61,647 D  
Common Stock 08/31/2017   S(2)   15,206 D $ 15 46,441 D  
Common Stock 08/31/2017   M(1)   2,294 A $ 7.96 48,735 D  
Common Stock 08/31/2017   S(2)   2,294 D $ 15 46,441 D  
Common Stock 08/31/2017   M(1)   11,552 A $ 9.65 57,993 D  
Common Stock 08/31/2017   S(2)   11,552 D $ 15 46,441 D  
Common Stock 08/31/2017   M(1)   13,448 A $ 9.65 59,889 D  
Common Stock 08/31/2017   S(2)   13,448 D $ 15 46,441 D  
Common Stock 08/31/2017   M(1)   3,795 A $ 6 50,236 D  
Common Stock 08/31/2017   S(2)   3,795 D $ 15 46,441 D  
Common Stock 08/31/2017   M(1)   21,204 A $ 6 67,645 D  
Common Stock 08/31/2017   S(2)   21,204 D $ 15 46,441 D  
Common Stock 08/31/2017   M(1)   1,079 A $ 6.3 47,520 D  
Common Stock 08/31/2017   S(2)   1,079 D $ 15 46,441 D  
Common Stock 08/31/2017   M(1)   13,920 A $ 6.3 60,361 D  
Common Stock 08/31/2017   S(2)   13,920 D $ 15 46,441 D  
Common Stock 08/31/2017   M(1)   617 A $ 9.42 47,058 D  
Common Stock 08/31/2017   S(2)   617 D $ 15 46,441 D  
Common Stock 08/31/2017   M(1)   11,883 A $ 9.42 58,324 D  
Common Stock 08/31/2017   S(2)   11,883 D $ 15 46,441 D  
Common Stock 08/31/2017   M(1)   694 A $ 11.1 47,135 D  
Common Stock 08/31/2017   S(2)   694 D $ 15 46,441 D  
Common Stock 08/31/2017   M(1)   2,639 A $ 11.1 49,080 D  
Common Stock 08/31/2017   S(2)   2,639 D $ 15 46,441 D  
Common Stock 08/31/2017   M(1)   695 A $ 11.1 47,136 D  
Common Stock 08/31/2017   S(2)   695 D $ 15 46,441 D  
Common Stock 08/31/2017   M(1)   2,638 A $ 11.1 49,079 D  
Common Stock 08/31/2017   S(2)   2,638 D $ 15 46,441 D  

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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
Incentive Stock Option (right to buy) $ 6 08/31/2017   M     21,204 04/05/2013 03/05/2023 Common Stock 21,204 $ 0 0 D  
Incentive Stock Option (right to buy) $ 6.3 08/31/2017   M     13,920 04/05/2012 03/05/2022 Common Stock 13,920 $ 0 0 D  
Incentive Stock Option (right to buy) $ 7.96 08/31/2017   M     2,294 03/26/2015 02/26/2025 Common Stock 2,294 $ 0 8,750 D  
Incentive Stock Option (right to buy) $ 9.42 08/31/2017   M     11,883 03/28/2011 02/28/2021 Common Stock 11,883 $ 0 0 D  
Incentive Stock Option (right to buy) $ 9.65 08/31/2017   M     13,448 03/24/2014 02/24/2024 Common Stock 13,448 $ 0 5,000 D  
Incentive Stock Option (right to buy) $ 11.1 08/31/2017   M     2,639 03/26/2009 02/26/2019 Common Stock 2,639 $ 0 2,638 D  
Incentive Stock Option (right to buy) $ 11.1 08/31/2017   M     2,638 03/26/2009 02/26/2019 Common Stock 2,638 $ 0 0 D  
Non-Qualified Stock Option (right to buy) $ 6 08/31/2017   M     3,795 04/05/2013 03/05/2023 Common Stock 3,795 $ 0 0 D  
Non-Qualified Stock Option (right to buy) $ 6.3 08/31/2017   M     1,079 04/05/2012 03/05/2022 Common Stock 1,079 $ 0 0 D  
Non-Qualified Stock Option (right to buy) $ 6.67 08/31/2017   M     16,666 03/23/2016 02/23/2026 Common Stock 16,666 $ 0 14,517 D  
Non-Qualified Stock Option (right to buy) $ 7.96 08/31/2017   M     15,206 03/26/2015 02/26/2025 Common Stock 15,206 $ 0 3,750 D  
Non-Qualified Stock Option (right to buy) $ 9.42 08/31/2017   M     617 03/28/2011 02/28/2021 Common Stock 617 $ 0 0 D  
Non-Qualified Stock Option (right to buy) $ 9.65 08/31/2017   M     11,552 03/24/2014 02/24/2024 Common Stock 11,552 $ 0 0 D  
Non-Qualified Stock Option (right to buy) $ 11.1 08/31/2017   M     694 03/26/2009 02/26/2019 Common Stock 694 $ 0 695 D  
Non-Qualified Stock Option (right to buy) $ 11.1 08/31/2017   M     695 03/26/2009 02/26/2019 Common Stock 695 $ 0 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Morgan Bradley Paul
280 EAST GRAND AVENUE
SOUTH SAN FRANCISCO, CA 94080		       SVP Drug Discovery & Early Dev  

Signatures

 Bradley Morgan   09/01/2017
**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) The exercise(s) reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 30, 2017.
(2) The sale(s) reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 30, 2017.

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