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, Section 17(a) of the Public
Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Alton Gregg H 		2. Issuer Name and Ticker or Trading Symbol

GILEAD SCIENCES INC [ GILD ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
EVP, Corp & Med Affairs
(Last)          (First)          (Middle)

GILEAD SCIENCES, INC., 333 LAKESIDE DRIVE 		3. Date of Earliest Transaction (MM/DD/YYYY)

11/1/2011
(Street)

FOSTER CITY, CA 94404
(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   11/1/2011     M (5)    3500   A $16.01   33290   D    
Common Stock   11/1/2011     S (5)    3500   D $41.0131   (4) 29790   D    
Common Stock   11/1/2011     M (5)    3500   A $17.4975   33290   D    
Common Stock   11/1/2011     S (5)    3500   D $41.0131   (4) 29790   D    
Common Stock   11/1/2011     M    515   A $19.36   30305   D    
Common Stock   11/1/2011     M    9485   A $17.4975   39790   D    
Common Stock   11/1/2011     S (5)    1000   D $41.0131   (4) 38790   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
Non-Qualified Stock Option (right to buy)   $16.01   11/1/2011     M   (5)       3500      (1) 1/26/2015   Common Stock   3500   $ 0   0   D    
Incentive Stock Option (right to buy)   $19.36   11/1/2011     M         515      (2) 5/9/2015   Common Stock   515   $ 0   0   D    
Non-Qualified Stock Option (right to buy)   $17.4975   11/1/2011     M   (5)       3500      (3) 7/29/2013   Common Stock   3500   $ 0   64360   D    
Non-Qualified Stock Option (right to buy)   $17.4975   11/1/2011     M         9485      (3) 7/29/2013   Common Stock   9485   $ 0   54875   D    

Explanation of Responses:
( 1)  The options have a 5 year vesting schedule. 20% of the options vested on January 26, 2006, the first anniversary of the date of the grant. The balance vested 5% every three months thereafter until fully vested on January 26, 2010. The options expire on January 26, 2015.
( 2)  The options have a 5 year vesting schedule. 20% of the options vested on May 9, 2006, the first anniversary of the date of the grant. The balance vested 5% every three months thereafter until fully vested on May 9, 2010. The options expire on May 9, 2015.
( 3)  The options have a 5 year vesting schedule. 20% of the options vested on July 30, 2004, the first anniversary of the date of the grant. The balance vested 5% every three months thereafter until fully vested on July 30, 2008. The options expire on July 29, 2013.
( 4)  Sale prices reported for the transaction reported here range from $40.70 to $41.2701. Full information regarding the number of shares purchased or sold at each price will be provided to the SEC, the issuer or its shareowners upon request.
( 5)  Pursuant to a Rule 105b-1 trading plan established by Mr. Alton on August 19, 2009 and amended July 30, 2010

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Alton Gregg H
GILEAD SCIENCES, INC.
333 LAKESIDE DRIVE
FOSTER CITY, CA 94404

EVP, Corp & Med Affairs

Signatures
/s/ Gregg H. Alton 11/3/2011
** 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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