On May 21, 2012, with the authorization of the Board of Directors of PDF Solutions Inc. Mr. Gregory Walker, Vice President, Finance and Chief Financial Officer returned from a temporary leave of absence that was previously disclosed in the company's Current Report on Form 8-K filed with the SEC on March 14, 2012 and resumed his responsibilities as the principal financial and accounting officer of the company. Mr. Shahbazian, who assumed Mr. Walker's duties and responsibilities while he was on leave, will continue as Vice President for a brief period of transition.