SEC FORM 3

SEC Form 3

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^*

LIEBERBURG IVAN M

(Last)

(First)

(Middle)

440 STEVENS AVE, SUITE 100

(Street)

SOLANA BEACH

92075

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
01/14/2016

3. Issuer Name and Ticker or Trading Symbol
Mirati Therapeutics, Inc. [ MRTX ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

Director	X	10% Owner
Officer (give title below)		Other (specify below)

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)
Common Stock	22,660	D⁽¹⁾
Common Stock	1,232,093	I	See Footnote⁽²⁾
Common Stock	429,340	I	See Footnote⁽³⁾

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)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	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)
Warrant (right to purchase)	⁽⁴⁾	11/21/2017	Common Stock	189,780	$7.86	D⁽²⁾
Warrant (right to purchase)	⁽⁴⁾	11/21/2017	Common Stock	78,186	$7.86	D⁽⁵⁾

Explanation of Responses:

1. These securities are owned directly by the reporting person, who may be deemed to be a member of a "group" for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, consisting of (i) Boxer Capital, LLC ("Boxer Capital"), (ii) Boxer Asset Management Inc. ("Boxer Management"), (iii) MVA Investors, LLC ("MVA Investors"), (iv) Braslyn Ltd., (v) Joe Lewis, (vi) the reporting person, (vii) Christopher Fuglesang, (viii) Rodney W. Lappe, (ix) Aaron I. Davis, (x) Neil Reisman, (xi) Shehan B. Dissanayake, (xii) Peter E. Harwin, and (xiii) William N. Harwin 2012 Gift Trust F/B/O Peter Harwin. On January 14, 2016, Boxer Capital transferred 791,139 shares of the common stock of the issuer, pro rata for no consideration as part of an internal reorganization.

2. These securities are owned directly by Boxer Capital, and indirectly by the reporting person, Boxer Management and Joe Lewis, by virtue of their ownership in Boxer Capital. The reporting person disclaims beneficial ownership of these securities to the extent he does not have a pecuniary interest therein. On January 14, 2016, Boxer Capital transferred 791,139 shares of the common stock of the issuer, pro-rata for no consideration as part of an internal reorganization.

3. These securities are owned directly and solely by MVA Investors, which has sole voting and dispositive power with respect to these securities. The reporting person is a member of MVA Investors. The reporting person disclaims beneficial ownership of these securities to the extent he does not have a pecuniary interest therein.

4. The warrants are not exercisable to the extent that, following exercise of such warrants, the warrant holder would beneficially own more than 19.99% of the issuer's common stock.

5. These securities are owned directly and solely by MVA Investors. The reporting person disclaims beneficial ownership of these securities to the extent he does not have a pecuniary interest therein.

Remarks:

	/s/ Ivan M. Lieberburg	01/15/2016
	** 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.
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