EXHIBIT 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

The undersigned, Elaine K. Roberts, President and Chief Financial Officer of Oppenheimer Holdings Inc. (the “Company”), hereby certifies that to her knowledge the Annual Report on Form 10-K for the year ended December 31, 2012 of the Company filed with the Securities and Exchange Commission on the date hereof (the “Report”) fully complies with the requirements of section 13(a) or 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 for the period specified.

Signed at New York, New York, this 6th day of March, 2013.

/s/ Elaine K. Roberts

Elaine K. Roberts

President and Principal Financial Officer