X0202 4 2007-05-29 0000018937 CERADYNE INC CRDN 0001216888 REED DAVID P 3169 RED HILL AVENUE COSTA MESA CA 92626 1 President, North American Oper Common Stock 2007-05-29 4 M 0 400 0 A 880 D Common Stock 2007-05-29 4 F 0 130 67.25 D 750 D Common Stock 594 I By 401(k) Plan Trust Common Stock 29 I Non-qualified Deferred Compensation Plan Restricted Stock Units 2007-05-29 4 M 0 400 0 D 2010-05-26 Common Stock 400 1200 D No shares were sold. These 130 shares represent amounts withheld and applied to the payroll tax withholding liability of the recipient generated by the vesting of the award. Includes 132 shares acquired on 05/01/2007 through a matching contribution by the Company in connection with the Ceradyne 401(k) Plan. Each Restricted Stock Unit represents the contingent right to receive one share of common stock. This Award vests as to 400 units on each of 05/26/2006, 05/26/2007, 05/26/2008, 05/26/2009 and 05/26/2010. /s/ Jerrold J. Pellizzon, attorney-in-fact for Mr. Reed 2007-05-31