EXHIBIT 31.5

CERTIFICATION OF THE PRINCIPAL EXECUTIVE OFFICER PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002 (18 U.S.C. SECTION 350)

I, Robert Stewart, certify that:

1. I have reviewed this Amendment No. 2 to the Annual Report on Form 10-K of Acacia Research Corporation; 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;

Dated:	April 30, 2018	/s/ Robert Stewart
		Robert Stewart President (Principal Executive Officer)