Exhibit 31.3
CERTIFICATION
I, Charles M. Baum, certify that:
1. I have reviewed this Amendment No. 1 to the Quarterly Report on Form 10-Q/A of Mirati Therapeutics, Inc.; and
2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.
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| Date: August 20, 2018 | /s/ Charles M. Baum |
| | Charles M. Baum |
| | President and Chief Executive Officer |
| | (Principal Executive Officer) |
