SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
  
 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
YANG TAIYIN
(Last) (First) (Middle)
GILEAD SCIENCES, INC.
333 LAKESIDE DRIVE
(Street)
FOSTER CITY CA 94404
(City) (State) (Zip)
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)
SVP, Pharm Dev & Mfg
3. Date of Earliest Transaction (Month/Day/Year)
02/13/2006
4. If Amendment, Date of 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
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 02/13/2006 M 12,000 A $2.8594 138,615 D
Common Stock 02/13/2006 M 58,664 A $4.4688 197,279 D
Common Stock 02/13/2006 M 2,000 A $7.0782 199,279 D
Common Stock 02/13/2006 M 4,800 A $7.4063 204,079 D
Common Stock 02/13/2006 M 3,000 A $9.3438 207,079 D
Common Stock 02/13/2006 M 11,624 A $7.2969 218,703 D
Common Stock 02/13/2006 M 1,888 A $11.7579 220,591 D
Common Stock 02/13/2006 M 3,208 A $7.3985 223,799 D
Common Stock 02/13/2006 M 1,000 A $9.81 224,799 D
Common Stock 02/13/2006 M 862 A $16.4375 225,661 D
Common Stock 3,992 I by Trust
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 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: 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) $2.8594 02/13/2006 M 12,000 (1) 07/22/2008 Common Stock 12,000 $0 0 D
Incentive Stock Option (right to buy) $4.4688 02/13/2006 M 58,664 (2) 01/25/2009 Common Stock 58,664 $0 0 D
Incentive Stock Option (right to buy) $7.0782 02/13/2006 M 2,000 (3) 01/26/2010 Common Stock 2,000 $0 0 D
Incentive Stock Option (right to buy) $7.2969 02/13/2006 M 11,624 (4) 07/21/2009 Common Stock 11,624 $0 0 D
Incentive Stock Option (right to buy) $7.3985 02/13/2006 M 3,208 (5) 01/17/2001 Common Stock 3,208 $0 0 D
Incentive Stock Option (right to buy) $7.4063 02/13/2006 M 4,800 (6) 04/05/2010 Common Stock 4,800 $0 0 D
Incentive Stock Option (right to buy) $9.3438 02/13/2006 M 3,000 (7) 07/20/2010 Common Stock 3,000 $0 0 D
Incentive Stock Option (right to buy) $9.81 02/13/2006 M 1,000 (8) 04/17/2011 Common Stock 1,000 $0 1,000 D
Incentive Stock Option (right to buy) $11.7579 02/13/2006 M 1,888 (9) 11/07/2010 Common Stock 1,888 $0 0 D
Incentive Stock Option (right to buy) $16.4375 02/13/2006 M 862 (10) 01/29/2012 Common Stock 862 $0 6,586 D
Explanation of Responses:
1. Options vested 20% on the July 23, 1999, the first anniversary date of the grant. The balance vested every three months thereafter and was fully vested at July 23, 2003.
2. Options vested 20% on the January 26, 2000, the first anniversary date of the grant. The balance vested every three months thereafter and was fully vested at January 26, 2004.
3. Options vested 20% on the January 26, 2001, the first anniversary date of the grant. The balance vested every three months thereafter and was fully vested at January 26, 2005.
4. Options vested 20% on the July 22, 2000, the first anniversary date of the grant. The balance vested every three months thereafter and was fully vested at July 22, 2004.
5. Options vested 20% on the January 18, 2002, the first anniversary date of the grant. The balance vested every three months thereafter and was fully vested at January 18, 2006.
6. Options vested 20% on the April 5, 2001, the first anniversary date of the grant. The balance vested every three months thereafter and was fully vested at April 5, 2005.
7. Options vested 20% on the July 20, 2001, the first anniversary date of the grant. The balance vested every three months thereafter and was fully vested at July 20, 2005.
8. Options vested 20% on the April 18, 2002, the first anniversary date of the grant. The balance vested every three months thereafter and was fully vested at April 18, 2006.
9. Options vested 20% on the November 8, 2001, the first anniversary date of the grant. The balance vested every three months thereafter and was fully vested at November 8, 2005.
10. Options vested 20% on the January 30, 2003, the first anniversary date of the grant. The balance vested every three months thereafter and was fully vested at January 30, 2007.
/s/ Taiyin Yang 02/15/2006
** 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 Number.