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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OMB Number: 3235-0287
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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 * Blum Robert I 2. Issuer Name and Ticker or Trading Symbol CYTOKINETICS INC [ CYTK ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)__X__ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
President & CEO
(Last)         (First)         (Middle)
280 EAST GRAND AVENUE		 3. Date of Earliest Transaction (MM/DD/YYYY)
2/26/2021
(Street)
SOUTH SAN FRANCISCO, CA 94080
(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  2/26/2021    F(1)    23799  D $18.73  310574 (2) D   
Common Stock                 2083  I  by Trust 1 (3)
Common Stock                 2083  I  by Trust 2 (4)

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

Explanation of Responses:
(1)  The reporting person is reporting the withholding of shares of common stock to satisfy the reporting persons withholding obligations in connection with the vesting of Restricted Stock Units vested on 02/26/2021 and does not represent a sale by the reporting person.
(2)  Includes 4,991 shares of common stock purchased pursuant to the Issuer's 2015 Employee Stock Purchase Plan (ESPP).
(3)  Shares held by The Bridget Blum 2003 Irrevocable Trust.
(4)  Shares held by The Brittany Blum 2003 Irrevocable Trust.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Blum Robert I
280 EAST GRAND AVENUE
SOUTH SAN FRANCISCO, CA 94080		 X
President & CEO

Signatures
By: Robert Wong For: Robert I. Blum 3/1/2021
**Signature of Reporting Person Date