Sec Form 4 Filing - CORTINOVIS STEPHEN P @ Aegion Corp - 2021-05-17

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person CORTINOVIS STEPHEN P 2. Issuer Name and Ticker or Trading Symbol Aegion Corp [ AEGN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 17988 EDISON AVE 3. Date of Earliest Transaction (MM/DD/YY) 05/17/2021 (Street) CHESTERFIELD, MO63005 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/17/2021 D( 1 )( 2 ) 55,739 D 0 D Common Stock 05/17/2021 D( 1 )( 2 ) 2,800 D 0 I By Spouse in Individual Retirement Account Common Stock 05/17/2021 D( 1 )( 2 ) 26,677 D 0 I By Trust ( 3 ) Common Stock 05/17/2021 D( 1 )( 2 ) 15,200 D 0 I Individual Retirement Account

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other CORTINOVIS STEPHEN P 17988 EDISON AVE CHESTERFIELD, MO63005 X Signatures /s/ Mark A. Menghini, as Attorney-in-Fact for Stephen P. Cortinovis 05/19/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On May 17, 2021, Carter Acquisition, Inc., a Delaware corporation ("Merger Sub") and a wholly-owned subsidiary of Carter Intermediate, Inc., a Delaware corporation ("Parent"), merged with and into Aegion Corporation (the "Company"), with the Company continuing as the surviving corporation (the "Merger"), pursuant to the previously announced Agreement and Plan of Merger, dated February 16, 2021 and amended on March 13, 2021 and April 13, 2021 (the "Merger Agreement") among Parent, Merger Sub and the Company. ( 2 )Pursuant to the Merger Agreement, at the effective time of the Merger: (a) each outstanding share of Common Stock (each, a "Share"), par value $0.01 per share, of the Company was cancelled and thereafter entitled the Reporting Person to receive $30 in cash without interest and less any applicable tax withholdings (the "Merger Consideration") and (b) each restricted stock unit and deferred stock unit (each a "Stock Unit") outstanding immediately prior to the consummation of the Merger became fully vested (to the extent unvested) and was canceled and converted into the right to receive, for each Share subject to such then-vested Stock Unit, the Merger Consideration. ( 3 )Shares held in a trust of reporting person's spouse, to which reporting person is the primary beneficiary.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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