[Statement Company Commission Offer Bidder ASE NTD Common Share ADSs Item 9. Description (a)(9) Letter to shareholders of Siliconware Precision Industries Co., Ltd., dated September 17, 2015 After due inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Dated: September 17, 2015 SILICONWARE PRECISION] [Letter to Shareholders Dear Valued Shareholders: Advanced Semiconductor Engineering, Inc. (“ASE”) engaged in an unsolicited tender offer to acquire up to 25% of common shares of Siliconware Precision Industries Co., Ltd. (“SPIL”) and/or American Depositary Shares (“ADSs”) The Board of Directors is unanimous in its opposition to this attempt to take over SPIL, and believes that the offered price undervalues]