X0306 4/A 2022-02-25 2022-03-01 0001201792 AMERICAN PUBLIC EDUCATION INC APEI 0001220428 SUNDERLAND RICHARD W JR 111 WEST CONGRESS STREET CHARLES TOWN WV 25414 0 1 0 0 EVP, Chief Financial Officer Common Stock, par value $.01 2022-02-25 4 A 0 10162 0 A 105839 D Common Stock, par value $.01 2022-02-25 4 F 0 1032 19.78 D 104807 D Performance-based restricted stock unit ("PSU") award pursuant to the American Public Education, Inc. 2017 Omnibus Incentive Plan. Award reflects a level of achievement of adjusted EBITDA and revenue performance measures for the issuer's fiscal year ended December 31, 2021. Award vests in three approximately equal installments, on February 25, 2022, January 22, 2023, and January 22, 2024. This amendment is being filed to reflect the correction of an administrative error related to the number of shares awarded as reported on the original Form 4. The issuer withheld shares of Common Stock from the reporting person to pay the tax withholding obligations related to the vesting of PSUs. /s/ Richard W. Sunderland, Jr. 2022-03-28