FORM 3
        	UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES
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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 *

RAMSAY DAVID A	2. Date of Event Requiring Statement (MM/DD/YYYY)
5/20/2013 
	3. Issuer Name and Ticker or Trading Symbol

HALOZYME THERAPEUTICS INC [HALO]	
(Last)        (First)        (Middle)

11388 SORRENTO VALLEY ROAD	4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                            _____ 10% Owner
___ X ___ Officer (give title below)          _____ Other (specify below)
VP and Chief Financial Officer /	
(Street)

SAN DIEGO, CA 92121       

(City)              (State)              (Zip)	5. 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 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)	
Common Stock  	105000  	D  	 	

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)	
1. Title of Derivate Security
(Instr. 4)	2. Date Exercisable and Expiration Date
(MM/DD/YYYY)	3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: 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				
Option to Purchase Common Stock  	11/11/2007  	11/11/2013  	Common Stock  	130000  	$0.39  	D  	 	
Option to Purchase Common Stock  	12/8/2008  	12/8/2014  	Common Stock  	20058  	$2.02  	D  	 	
Option to Purchase Common Stock  	2/1/2009  	10/13/2014  	Common Stock  	50000  	$2.05  	D  	 	
Option to Purchase Common Stock  	  (1)	2/4/2020  	Common Stock  	14697  	$5.55  	D  	 	
Option to Purchase Common Stock  	2/6/2012  	2/6/2018  	Common Stock  	24620  	$5.6  	D  	 	
Option to Purchase Common Stock  	2/5/2013  	2/5/2019  	Common Stock  	25148  	$6.1  	D  	 	
Option to Purchase Common Stock  	2/4/2014   (2)	2/4/2023  	Common Stock  	17700  	$6.55  	D  	 	
Option to Purchase Common Stock  	  (3)	2/3/2021  	Common Stock  	15022  	$7.14  	D  	 	
Option to Purchase Common Stock  	2/5/2011  	2/5/2017  	Common Stock  	12943  	$7.51  	D  	 	
Option to Purchase Common Stock  	2/2/2013   (2)	2/2/2022  	Common Stock  	25000  	$11.29  	D  	 	
Restricted Stock Award  	  (4)	2/2/2022  	Common Stock  	9375  	$0  	D  	 	
Restricted Stock Award  	2/4/2014   (5)	2/4/2024  	Common Stock  	8850  	$0  	D  	 	

Explanation of Responses:	
(  1) 	4,220 shares of this option grant vest in equal monthly installments of 469 shares. The remaining balance is fully vested.	
(  2) 	This option vests one-fourth on such date and then 1/48 monthly thereafter.	
(  3) 	8,205 shares of this option vest in equal monthly increments of 391 shares. The remaining balance is fully vested.	
(  4) 	This restricted stock award vests in equal annual installments of 3,125 shares in February of 2014, 2015 and 2016.	
(  5) 	This award vests one-fourth on such date and then one-fourth on each anniversary thereafter.	

Reporting Owners	
Reporting Owner Name / Address	Relationships	
	Director	10% Owner	Officer	Other	
RAMSAY DAVID A
11388 SORRENTO VALLEY ROAD
SAN DIEGO, CA 92121			VP and Chief Financial Officer		

Signatures		
David A. Ramsay		5/24/2013	
** 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 5(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.