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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
18937	Ceradyne Inc	CRDN	Miscellaneous Manufacturing Industries (3990)	330055414

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1268645	Bruce Lockhart	3169 Red Hill Avenue Costa Mesa CA 92626	Vice President	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Disposition	2011-02-28	332	$37.93	2,397	No	4	S	Direct
Common Stock	Disposition	2011-02-28	100	$37.92	2,297	No	4	S	Direct
Common Stock	Disposition	2011-02-28	800	$37.95	1,497	No	4	S	Direct
Common Stock	Disposition	2011-02-28	100	$37.96	1,397	No	4	S	Direct
Common Stock	Acquisiton	2011-03-01	1,350	$3.96	2,747	No	4	M	Direct
Common Stock	Acquisiton	2011-03-01	1,125	$16.89	3,872	No	4	M	Direct
Common Stock	Acquisiton	2011-03-01	1,500	$21.84	5,372	No	4	M	Direct
Common Stock	Disposition	2011-03-01	700	$37.28	4,672	No	4	S	Direct
Common Stock	Disposition	2011-03-01	300	$37.30	4,372	No	4	S	Direct
Common Stock	Disposition	2011-03-01	200	$37.36	4,172	No	4	S	Direct
Common Stock	Disposition	2011-03-01	100	$37.35	4,072	No	4	S	Direct
Common Stock	Disposition	2011-03-01	1,000	$37.38	3,072	No	4	S	Direct
Common Stock	Disposition	2011-03-01	546	$37.40	2,526	No	4	S	Direct
Common Stock	Disposition	2011-03-01	129	$37.27	2,397	No	4	S	Direct
Common Stock	Disposition	2011-03-01	600	$37.28	1,797	No	4	S	Direct
Common Stock	Disposition	2011-03-01	400	$37.28	1,397	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	M	Direct
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option (Right to Buy)	Disposition	2011-03-01	1,350	$0.00	1,350	$3.96
Common Stock	Employee Stock Option (Right to Buy)	Disposition	2011-03-01	1,125	$0.00	1,125	$16.89
Common Stock	Employee Stock Option (Right to Buy)	Disposition	2011-03-01	1,500	$0.00	1,500	$21.84

Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
2012-12-16	No	4	M	Direct
2013-09-10	No	4	M	Direct
2014-08-16	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	1,387	Indirect	By 401(k) Plan Trust
Common Stock	428	Indirect	Non-qualified Deferred Compensation Plan

Footnotes

This Option vests in five equal installments on December 16, 2003, December 16, 2004, December 16, 2005, December 16, 2006 and December 16, 2007.
This Option vests in five equal installments on September 10, 2004, September 10, 2005, September 10, 2006, September 10, 2007 and September 10, 2008.
This Option vests as to 500 shares on each of 8/16/2005, 8/16/2006, 8/16/2007, 8/16/2008 and 8/16/2009.
Includes shares acquired through a matching contribution by the Company in connection with the Ceradyne 401(k) Plan.
Includes shares acquired through a matching contribution by the Company in connection with the Non-Qualified Deferred Compensation Plan.