X0306 4 2014-06-06 0000005768 AMERICAN SCIENCE & ENGINEERING, INC. ASEI 0001505398 Tropeano Michael AMERICAN SCIENCE AND ENGINEERING, INC. 829 MIDDLESEX TURNPIKE BILLERICA MA 01821 0 1 0 0 SVP Customer Devel & Support Common Stock 2014-06-06 4 S 0 1213 67.81 D 2482 D Common Stock 2014-06-09 4 S 0 1232 67.53 D 1250 D The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from a low of $67.80 to a high of $67.88 for an average of $67.812. 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. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from a low of $67.511 to a high of $67.541 for an average of $67.528. 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 1,250 restricted stock units which will vest on August 12, 2014. Michael J. Muscatello 2014-06-10