X0202 4 2005-05-23 0000790705 TEKELEC TKLC 0001328255 Rush Gregory S C/O TEKELEC 26580 W. AGOURA RD. CALABASAS CA 91302 0 1 0 0 Vice Pres & Corp. Controller Common Stock 0 D Employee Stock Option (right to buy) 13.02 2005-05-23 4 A 0 75000 0 A Common Stock 75000 75000 D Restricted Stock Unit 2005-05-23 4 A 0 17281 0 A 2006-05-23 2006-05-23 Common Stock 17281 17281 D Option to purchase 75,000 shares vests and becomes exercisable as to 18,750 shares on May 23, 2006. The remaining 56,250 shares vest and become exercisable cumulatively in 12 equal quarterly installments with the first of such 12 installments vesting on September 30, 2006 and one additional installment vesting on the last day of each calendar quarter thereafter. Each such installment will expire on the four-year anniversary of its vesting date. Restricted Stock Units automatically convert to Tekelec Common Stock on a one-for-one basis. Each Restricted Stock Unit represents the right to receive one share of Tekelec Common Stock, to be issued and delivered on the one-year anniversary of the date of grant. Gregory S. Rush 2005-05-25