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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
5768	American Science & Engineering Inc.	ASEI	X-Ray Apparatus & Tubes & Related Irradiation Apparatus (3844)	042240991

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1353380	Robert Postle	American Science And Engineering, Inc. 829 Middlesex Turnpike Billerica MA 01821	Svp	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	2011-05-17	2,408	$87.86	3,639	No	4	S	Direct
Common Stock	Acquisiton	2011-05-17	905	$61.40	4,544	No	4	M	Direct
Common Stock	Disposition	2011-05-17	905	$87.37	3,639	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (right to buy)	Disposition	2011-05-17	905	$0.00	905	$61.40

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
453	2011-05-06	2019-05-19	No	4	M	Direct

Footnotes

The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from a low of $87.64 to a high of $87.98 for an average of $87.86. The reporting person undertakes to provide to American Science and Engineering, Inc., any security holder of American Science and Engineering, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4.
On May 15, 2009 the reporting person was granted an option to purchase 1358 shares of common stock. The option vests in increments based on AS&E's satisfaction of certain performance criteria. The performance criteria was met for two thirds of the goals, resulting in vesting of the option as of to 905 shares.