X0306 4 2022-01-18 0001201792 AMERICAN PUBLIC EDUCATION INC APEI 0001346178 Landon Timothy J 111 WEST CONGRESS STREET CHARLES TOWN WV 25414 1 0 0 0 Common Stock, par value $.01 2022-01-18 4 S 0 52 21.3633 D 18439 D Common Stock, par value $.01 2022-01-18 4 S 0 398 21.7954 D 18041 D Common Stock, par value $.01 2022-02-17 4 S 0 31 17.4187 D 18010 D Common Stock, par value $.01 2022-02-17 4 S 0 419 18.1914 D 17591 D Common Stock, par value $.01 2022-03-17 4 S 0 450 23.0538 D 17141 D Common Stock, par value $.01 2022-04-18 4 S 0 450 21.782 D 16691 D The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person. The price of $21.3633 per share represents a weighted average of sales prices ranging from $21.33 to $21.43 per share. The reporting person undertakes to provide upon request by the Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price. The price of $21.7954 per share represents a weighted average of sales prices ranging from $22.55 to $22.44 per share. The reporting person undertakes to provide upon request by the Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price. The price of $17.4187 per share represents a weighted average of sales prices ranging from $17.31 to $17.45 per share. The reporting person undertakes to provide upon request by the Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price. The price of $18.1914 per share represents a weighted average of sales prices ranging from $17.47 to $18.45 per share. The reporting person undertakes to provide upon request by the Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price. The price of $23.0538 per share represents a weighted average of sales prices ranging from $22.40 to $23.38 per share. The reporting person undertakes to provide upon request by the Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price. The price of $21.782 per share represents a weighted average of sales prices ranging from $21.28 to $22.02 per share. The reporting person undertakes to provide upon request by the Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price. /s/ Richard W. Sunderland, Jr., Attorney-in-Fact 2022-04-20