GPAT · Quarterly Report (Form 10-Q) · Filed August 13, 2025

Gp-act III Acquisition Corp — 10-Q exhibit

ea025226001ex32-1_gpact3.htm

Gp-act III Acquisition Corp on Boardroom Alpha

Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of GP-Act III Acquisition Corp. (the “Company”) on Form 10-Q for the quarterly period ended June 30, 2025, as filed with the Securities and Exchange Commission (the “Report”), I, Antonio Bonchristiano, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

The Report fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934; and

The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: August 13, 2025

	/s/ Antonio Bonchristiano
	Antonio Bonchristiano
	Chief Executive Officer
	(Principal Executive Officer)

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