X0206 3 2013-05-22 0 0000005768 AMERICAN SCIENCE & ENGINEERING, INC. ASEI 0001505398 Tropeano Michael AMERICAN SCIENCE AND ENGINEERING, INC. 829 MIDDLESEX TURNPIKE BILLERICA MA 01821 0 1 0 0 VP Customer Devel & Support Common Stock 3695 D Employee Stock Option (right to buy) 46.68 2015-02-10 Common Stock 4000 D Employee Stock Option (right to buy) 53.55 2015-11-01 Common Stock 2000 D Includes 2,500 restricted stock units granted on June 15, 2012, which will vest in two equal installments on August 12, 2013 and 2014. The option became exercisable in two equal installments on February 10, 2007 and 2008. The option became exercisable on November 1, 2008. Exhibit List: Exhibit 24 - Power of Attorney /s/John B. De Luca, attorney-in-fact 2013-05-29