Sec Form 4 Filing - Gordon Charles R. @ Aegion Corp - 2019-02-18

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 Gordon Charles R. 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 X __ Officer (give title below) _____ Other (specify below) President & CEO (Last) (First) (Middle) 17988 EDISON AVE. 3. Date of Earliest Transaction (MM/DD/YY) 02/18/2019 (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 ( 1 ) 02/18/2019 A 28,112 A $ 0 334,914 D Common Stock ( 2 ) 02/18/2019 F 13,501 D $ 20.24 321,413 D Common Stock ( 3 ) 02/18/2019 A 55,583 A $ 0 376,996 D Common Stock 5,455 I Individual Retirement Account Deferred Stock Units ( 4 ) 7,369 D

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. Titl e 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 Gordon Charles R. 17988 EDISON AVE. CHESTERFIELD, MO63005 X President & CEO Signatures /s/ Mark A. Menghini, as Attorney-in-Fact for Charles R. Gordon 02/20/2019 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Vesting of performance units granted to the reporting person on February 24, 2016 as part of the Company's 2016-2018 performance unit grant. ( 2 )In connection with the vesting of the reporting person's February 24, 2016 performance unit award (28,112 shares issued), the reporting person surrendered 13,501 shares of the issuer's Class A common stock, $0.01 par value per share ("Common Stock"), to the issuer for payment of tax liabilities. ( 3 )Annual award of restricted stock units pursuant to the Company's 2016 Employee Equity Incentive Plan, as amended. Each restricted stock unit represents a contingent right to receive one share of Common Stock. ( 4 )Each deferred stock unit ("DSU") represents the issuer's obligation to transfer one 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 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.

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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