X0304 5 2011-12-31 0 0 0 0000353020 Aegion Corp AEGN 0001185484 CORTINOVIS STEPHEN P C/O AEGION CORPORATION 17988 EDISON AVENUE CHESTERFIELD MO 63005 1 0 0 0 Common Stock 23736 I By trust of spouse Common Stock 7200 D Deferred Stock Units 29538 D The number of shares reported as direct and indirect holdings have been adjusted to reflect a change in form of beneficial ownership of 23,736 shares previously included in the Reporting Person's direct holdings and now included in the Reporting Person's indirect holdings. These shares were transferred to a trust in the name of the Reporting Person's spouse, to which the Reporting Person is the primary beneficiary Each Deferred Stock Unit ("DSU") represents the Issuer's obligation to transfer one share of Class A common stock, $.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 2006 Non-Employee Director Equity Incentive Plan, and are immediately vested upon grant. Promptly following termination of the undersigned's service on the Issuer's Board of Directors or, at the undersigned's election, a specified distribution date, the Issuer will distribute to the undersigned shares of Common Stock equal to the number of DSUs reflected in the undersigned's account at such time. Lori A. Knudson, as Attorney-in-Fact for Stephen Cortinovis 2012-02-14