X0306 4 2010-11-08 0001201792 AMERICAN PUBLIC EDUCATION INC APEI 0001417316 Boston Wallace E. Jr. 111 WEST CONGRESS STREET CHARLES TOWN WV 25414 1 1 0 0 President and CEO Common Stock par value $.01 2010-11-08 4 F 0 3356 27.07 D 459476 D Common Stock par value $.01 2011-06-29 4 G 0 1000 0 D 458476 D Common Stock par value $.01 2012-02-01 4 G 0 2000 0 D 456476 D Common Stock par value $.01 2013-12-20 4 G 0 5416 0 D 451060 D Common Stock par value $.01 2014-01-21 4 F 0 1266 44.55 D 449794 D Common Stock par value $.01 2014-03-03 4 S 0 4000 35.47 D 445794 D Common Stock par value $.01 2014-05-01 4 S 0 4000 35.00 D 441794 D Common Stock par value $.01 2015-01-21 4 F 0 1266 34.32 D 440528 D The issuer withheld shares of Common Stock from the reporting person to pay the tax withholding obligations related to the vesting of restricted shares of Common Stock held by the reporting person. The amount of securities reported as beneficially owned following the reported transaction reflects adjustments to the number reported in prior filings to correct certain clerical errors in those filings. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person. /s/ Richard W. Sunderland, Jr., Attorney-in-Fact 2019-08-30