FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * O'Day Daniel Patrick (Last) (First) (Middle) 333 LAKESIDE DRIVE (Street) FOSTER CITY CA 94404 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 02/26/2019	3. Issuer Name and Ticker or Trading Symbol GILEAD SCIENCES INC [ GILD ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner X Officer (give title below) Other (specify below) Chairman & CEO	5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	/s/ Marissa Song by Power of Attorney for Daniel P. O'Day	03/01/2019
	** 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.
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Power of Attorney

	Know all by these presents, that the undersigned hereby
constitutes and appoints each of Robin L. Washington, Gregg H. Alton,
Brett A. Pletcher, Katie Watson, Jason Okazaki, Diane Wilfong and
Marissa Song, signing individually, the undersigned?s true and lawful
attorneys-in-fact and agents to:

(1) execute for and on behalf of the undersigned, an officer or
director  of Gilead Sciences, Inc. (the ?Company?), Forms 3, 4 and
5 in accordance with Section 16(a) of the Securities Exchange Act of
1934, as amended (the ?Exchange Act?) and the rules there under;

(2) do and perform any and all acts for and on behalf of the undersigned
that may be necessary or desirable to complete and execute such Form 3, 4
or 5, complete and execute and amendment or amendments thereto, and timely
file such forms or amendments with United States Securities and Exchange
Commission and any stock exchange or similar authority; and

(3)take any other action of any nature whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact, may be of
benefit, in the best interest of, or legally required by, the
undersigned, it being understood that the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant to this
Power of Attorney shall be in such form and shall contain such terms
and conditions as such attorney-in-fact may approve in such
attorney-in-fact?s discretion.

	The undersigned hereby grants to each such attorney-in-fact full
power and authority to do and perform any and every act and thing
whatsoever requisite, necessary, or proper to be done in the exercise of
any of the rights and powers herein granted, fully to all intents and
purpose as the undersigned might or could do if personally present, with
full power of substitution or revocation, hereby ratifying and confirming
all that such attorney-in-fact, or such attorney-in-fact?s substitute or
substitutes, shall lawfully do or cause to be done by virtue of this power
of attorney and the rights and powers herein granted. The undersigned
acknowledges that the foregoing attorneys-in-fact, in serving in such
capacity at the request of the undersigned, are not assuming, nor is the
Company assuming, any of the undersigned?s responsibilities to comply
with Section 16 of the Exchange Act.

	This Power of Attorney shall remain in full force and effect
until the earliest to occur of (a) the undersigned is no longer required
to file Forms 3, 4 and 5 with respect to the undersigned?s holdings of
and transactions in securities issued by the Company, (b) revocation by
the undersigned in a signed writing delivered to the foregoing
attorney?s-in-fact or (c) as to any attorney-in-fact individually, until
such attorney-in-fact shall no longer be employed by the Company.

 	IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 22nd day of February 2019.


/s/Daniel P. O'Day

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