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 Annual Report of AssetMark Financial Holdings, Inc. (the “Company”) on Form 10-K for the year ending December 31, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Michael Kim, the Chief Executive Officer of the Company, certify, pursuant to Rule 13a-14(b) or Rule 15d-14(b) of the Securities Exchange Act of 1934 and § 1350 of Chapter 63 of Title 18 of the United States Code, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

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

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

Date: March 14, 2024	By:	/s/ Michael Kim
		Michael Kim
		Chief Executive Officer