Rubicon Technology (RBCN) 10-Q 2010 Q1 Quarterly report

Exhibit 32.1

Certification Pursuant To Section 906 of The Sarbanes-Oxley Act of 2002,

18 U.S.C. Section 1350

In connection with the Quarterly Report of Rubicon Technology, Inc. (the “Company”) on Form 10-Q for the three months ended March 31, 2010 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Raja M. Parvez, President and Chief Executive Officer of the Company, and I, William F. Weissman, Chief Financial Officer of the Company, 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:

(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 results of operations of the Company.

Date: May 5, 2010	By:	/s/ Raja M. Parvez
		Raja M. Parvez President and Chief Executive Officer
Date: May 5, 2010	By:	/s/ William F. Weissman
		William F. Weissman Chief Financial Officer

A signed original of this written statement required by Section 906 has been provided to the registrant and will be retained by the registrant and furnished to the Securities and Exchange Commission or its staff upon request.