X0306 4 2020-04-22 0000353020 Aegion Corp AEGN 0001185484 CORTINOVIS STEPHEN P 17988 EDISON AVE. CHESTERFIELD MO 63005 1 Common Stock 2020-04-22 4 A 0 7869 0 A 57192 D Common Stock 2800 I By Spouse in Individual Retirement Account Common Stock 26677 I By Trust Common Stock 15200 I Individual Retirement Account Annual award of deferred stock units ("DSUs"). Each DSU represents the issuer's obligation to transfer one share of the issuer's Class A common stock, $0.01 par value per share ("Common Stock"), in accordance with the terms of the deferred stock unit agreement pursuant to which the DSUs were granted. The DSUs were granted under the issuer's Non-Employee Director Equity Plan, and are subject to a one-year vesting period from the date of grant. Once the DSUs vest, shares of Common Stock equal to the number of DSUs reflected in the reporting person's account will be distributed to the reporting person either promptly following termination of the reporting person's service on the issuer's Board of Directors or, at the reporting person's election of a specified distribution date. Shares held in a trust of reporting person's spouse, to which reporting person is the primary beneficiary. /s/ Mark A. Menghini, as Attorney-in-Fact for Stephen P. Cortinovis 2020-04-24