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Filing Details

Accession Number:: 0000947871-13-000728
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2013-10-31 16:31:49
Reporting Period:: 2013-10-29

Filing Date:: 2013-10-31
Accepted Time:: 2013-10-31 16:31:49
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1576263	Mirati Therapeutics Inc.	MRTX	Pharmaceutical Preparations (2834)	462693615

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1055949	D Samuel Isaly	601 Lexington Avenue, 54Th Floor New York NY 10022	No	No	Yes	No
1055951	Orbimed Advisors Llc	601 Lexington Avenue, 54Th Floor New York NY 10022	No	No	Yes	No
1502240	Orbimed Capital Gp Iv Llc	601 Lexington Avenue, 54Th Floor New York NY 10022	No	No	Yes	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, Par Value $0.001 Per Share	Acquisiton	2013-10-29	125,000	$17.50	1,274,332	No	4	P	Indirect	See Footnotes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	See Footnotes

Footnotes

Represents shares of common stock of the Issuer ("Shares") purchased by OrbiMed Private Investments IV, LP ("OPI IV") in a secondary offering pursuant to a registration statement on Form S-1 (File No. 333-191544) that was completed on October 29, 2013.
These Shares are held of record by OPI IV and may be deemed to be indirectly beneficially owned by OrbiMed Capital GP IV LLC ("GP IV"), OrbiMed Advisors LLC ("Advisors"), and Samuel D. Isaly ("Isaly"). GP IV is the sole general partner of OPI IV. Advisors, a registered adviser under the Investment Advisers Act of 1940, as amended, is the sole managing member of GP IV. By virtue of such relationships, GP IV and Advisors may be deemed to have voting and investment power with respect to the securities held by OPI IV noted above. Isaly, a natural person, is the managing member of and owner of a controlling interest in Advisors, and in such capacity may also be deemed to have voting and investment power over the securities held by OPI IV. Peter Thompson, an employee of Advisors, currently serves on the Issuer's board of directors.
This Form 4 is being jointly filed by Advisors, GP IV and Isaly. Each of GP IV, Advisors and Isaly disclaims beneficial ownership of the securities reported herein for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of its or his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Persons are beneficial owners for the purpose of Section 16 of the Exchange Act, or for any other purpose.