X0306 4 2016-06-15 0001201792 AMERICAN PUBLIC EDUCATION INC APEI 0001417350 Gilbert Carol S 111 WEST CONGRESS STREET CHARLES TOWN WV 25414 0 1 0 0 EVP, Programs and Marketing Common Stock, par value $.01 2016-06-15 4 S 0 500 27.35 D 51185 D The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person. /s/ Richard W. Sunderland, Jr., Attorney-in-Fact 2016-06-17