Exhibit 31.3

CERTIFICATION PURSUANT TO RULE 13A-14(A)/15D-14(A)

I, Mark Zagorski, certify that:

1. I have reviewed this Annual Report on Form 10-K/A (Amendment No. 1) of Telaria, 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.