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 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(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * KIRK RANDAL J   2. Issuer Name and Ticker or Trading Symbol HALOZYME THERAPEUTICS INC [HALO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O THIRD SECURITY, LLC, 1881 GROVE AVENUE 3. Date of Earliest Transaction (Month/Day/Year) 05/15/2012 (Street) RADFORD, VA 24141 4. If Amendment, Date 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 (City) (State) (Zip) 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 05/15/2012   P   427,581 A $ 7.35 3,333,528 I by Kapital Joe (1) Common Stock 05/16/2012   P   344,910 A $ 7.44 3,678,438 I by Kapital Joe (1) Common Stock 05/17/2012   P   299,007 A $ 7.5 3,977,445 I by Kapital Joe (1) Common Stock               234,300 I by JPK 2009 (1) Common Stock               234,300 I by MGK 2009 (1) Common Stock               1,722,965 I by R.J. Kirk DOT (1) Common Stock               293,000 I by JPK 2008 (1) Common Stock               293,000 I by MGK 2008 (1) Common Stock               293,000 I by ZSK 2008 (1) Common Stock               10,945 I by Lotus Capital (1) Common Stock               1,436,186 I by Kirkfield (1) Common Stock               135,000 I by Staff 2001 (1) Common Stock               1,326,320 I by NRM IV (1) Common Stock               6,328,853 I by NRM V (1) Common Stock               3,450,000 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 Underlying Securities (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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
KIRK RANDAL J C/O THIRD SECURITY, LLC 1881 GROVE AVENUE RADFORD, VA 24141	X	X

Signatures

/s/ Randal J. Kirk		05/17/2012
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	Randal J. Kirk controls each of Kapital Joe, LLC ("Kapital Joe"), JPK 2009, LLC ("JPK 2009"), MGK 2009, LLC ("MGK 2009"), R.J. Kirk Declaration of Trust ("R.J. Kirk DOT"), JPK 2008, LLC ("JPK 2008"), MGK 2008, LLC ("MGK 2008"), ZSK 2008, LLC ("ZSK 2008"), Lotus Capital (2000) Company, Inc. ("Lotus Capital"), Kirkfield, L.L.C. ("Kirkfield"), Third Security Staff 2001 LLC ("Staff 2001"), New River Management IV, LP ("NRM IV") and New River Management V, LP ("NRM V"). Shares held by these entities may be deemed to be indirectly beneficially owned (as defined under Rule 13d-3 promulgated under the Securities Exchange Act of 1934, as amended) by Mr. Kirk. Mr. Kirk disclaims beneficial ownership of such shares, except to the extent of any pecuniary interest therein.

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