Exhibit 31.2
Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
I, William F. Weissman, certify that:
| 1. | I have reviewed this Quarterly Report on Form 10-Q/A of Rubicon Technology, Inc.; and |
| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; |
| Date: August 23, 2012 | By: | /s/ William F. Weissman | ||
| William F. Weissman | ||||
| Chief Financial Officer |
