FORM 4 [X] 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 OF SECURITIES
                                                                                  
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OMB Number: 3235-0287
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Young Kenneth L
2. Issuer Name and Ticker or Trading Symbol

Aegion Corp [ AEGN ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
SVP, Treasury and Tax
(Last)          (First)          (Middle)

17988 EDISON AVE.
3. Date of Earliest Transaction (MM/DD/YYYY)

5/17/2021
(Street)

CHESTERFIELD, MO 63005
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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 5/17/2021  A(1)  9909 A (1)36909 D  
Common Stock 5/17/2021  D(2)  36909 D (2)0 D  

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date7. Title and Amount of Securities Underlying Derivative Security
(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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares

Explanation of Responses:
(1) Represents shares of Common Stock (each, a "Share"), par value $0.01 per share, of Aegion Corporation (the "Company") that are subject to performance units ("PUs"). 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 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. Pursuant to the Merger Agreement, each PU outstanding immediately prior to the consummation of the Merger became fully vested based on the greater of target and actual performance (as applicable).
(2) At the effective time of the Merger: (a) each outstanding Share 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, PU, 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.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Young Kenneth L
17988 EDISON AVE.
CHESTERFIELD, MO 63005


SVP, Treasury and Tax

Signatures
/s/ Mark A. Menghini, as Attorney-in-Fact for Kenneth L. Young5/19/2021
**Signature of Reporting PersonDate

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