X0306 4 2014-06-30 0000005768 AMERICAN SCIENCE & ENGINEERING, INC. ASEI 0001447577 Cline Robert B AMERICAN SCIENCE AND ENGINEERING, INC. 829 MIDDLESEX TURNPIKE BILLERICA MA 01821 0 1 0 0 SVP Common Stock 2014-06-30 4 S 0 1226 68.56 D 5180 D Common Stock 290 I By 401(k) Plan The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 29, 2014. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from a low of $68.24 to a high of $69.16 for an average of $68.5568. 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. Includes 290 shares of AS&E common stock acquired under the AS&E 401(k) Plan. The information in this report is based on a plan statement dated as of 6/30/2014. Michael J. Muscatello, attorney-in-fact 2014-07-01