Exhibit 32.1

CERTIFICATION OF THE

PRINCIPAL 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 on Form 10-Q of Oyster Enterprises II Acquisition Corp (the “Company”) for the quarterly period ended June 30, 2025, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Mario Zarazua, Chief Executive Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

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

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

Dated: August 8, 2025

	/s/ Mario Zarazua
	Mario Zarazua
	Chief Executive Officer
	(Principal Executive Officer)

Oyster Enterprises II Acquisition Corp 10-Q