VOC Energy Trust (VOC) 10-K 2017 FY Annual report

QuickLinks -- Click here to rapidly navigate through this document

Exhibit 32.1

March 14, 2018
Via EDGAR
Securities and Exchange Commission
Judiciary Plaza
450 Fifth Street, N.W.
Washington, D.C. 20549

Re: Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes Oxley Act of 2002

Ladies and Gentlemen:

        In connection with the Annual Report of VOC Energy Trust (the "Trust") on Form 10-K for the year ended December 31, 2017 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), the undersigned, not in its individual capacity but solely as the trustee of the Trust, certifies pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes Oxley Act of 2002, that to its knowledge:

(1)

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



(2)

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

        The above certification is furnished solely pursuant to Section 906 of the Sarbanes Oxley Act of 2002 (18 U.S.C. 1350) and is not being filed as part of the Form 10-K or as a separate disclosure document.

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.,
Trustee for VOC Energy Trust
By	/s/ MICHAEL J. ULRICH Michael J. Ulrich Vice President

QuickLinks

Exhibit 32.1