Aegion Corporation Awarded Three Contracts Valued at Approximately $32 Million

Aegion Corporation (“Aegion” or the “Company”) (Nasdaq Global Select Market: AEGN) today announced that its Corrosion Protection platform was recently awarded three contracts with a combined value of approximately $32 million.

The Aegion Coatings Services group within the Corrosion Protection platform was awarded a contract in the Caspian Sea region to perform outer diameter field coatings for a 300-mile onshore natural gas pipeline expansion. The project is expected to begin in the fall of 2015 and be completed by the end of 2017.

Aegion’s subsidiary, The Bayou Companies, LLC, was awarded two pipe coating contracts at its Louisiana facility. The first requires the application of a multi-layer corrosion protection coating and a proprietary temperature and pressure control insulation coating to a 14-mile transmission pipeline associated with a Gulf of Mexico deepwater oil field development. The insulation coating portion of the contract will be applied onsite by Bayou Wasco Insulation, LLC, a joint venture between Aegion and Malaysian-based Wasco Energy, Ltd. The project is expected to begin in the fall of 2015 and conclude in early 2016. The second project consists of a fusion bonded epoxy coating for corrosion protection in combination with a concrete buoyancy control coating for a 32-mile pipeline that will transport crude oil from existing facilities in the Gulf Coast to various refineries in the region. This project is expected to begin this summer and conclude by the first quarter of 2016.

Greta Voss, President of Aegion’s Corrosion Protection platform, commented, “We are very pleased to be awarded these contracts, which introduce our field pipe protection coating capabilities in the Caspian region and add to an improved backlog of pipeline coating projects in the Gulf Coast region of the United States. We look forward to the successful completion of these projects, which will help safeguard these vital pipeline assets for our customers.”

About Aegion Corporation

Aegion Corporation’s mission is to keep infrastructure working better, safer and longer for customers throughout the world. Aegion provides proprietary technologies and services: (i) to protect against the corrosion of industrial pipelines; (ii) to rehabilitate and strengthen water, wastewater, energy and mining piping systems and buildings, bridges, tunnels and waterfront structures; and (iii) to utilize integrated professional services in engineering, procurement, construction, maintenance and turnaround services for a broad range of energy related industries. More information about Aegion can be found at www.aegion.com.

About Bayou Companies, LLC

Bayou has provided services to the oil and gas pipeline industry for over 70 years, offering premier deepwater coating, insulation and prefabrication in North America and high-quality anticorrosion and insulated pipe coating in Western Canada. More information about Bayou can be found at www.bayoucompanies.com.

About Bayou Wasco Insulation, LLC

Bayou Wasco Insulation, LLC, is a joint venture between Aegion Corporation and Wasco Energy, Ltd. Bayou Wasco provides offshore insulation services to customers in the United States, Gulf of Mexico, Central America and the Caribbean. More information about Bayou Wasco can be found at http://www.bayoucompanies.com/Services/Coating-Services/Insulation-Coating.aspx.

About Coating Services

Coating Services, within Aegion’s Corrosion Protection platform, consists of CCSI and CRTS, two field welded pipe joint coating businesses. CRTS and CCSI use innovative robotic and other custom equipment to apply internal and external field joint coatings to prevent corrosion in offshore and onshore pipelines. Coating Services serves customers all over the world from Chile and Brazil to Saudi Arabia and North America. More information about Coating Services can be found at www.coatingrobotics.com and www.commercialcoating.com

Forward-Looking Statements

The Private Securities Litigation Reform Act of 1995 provides a “safe harbor” for forward looking statements. Aegion makes forward-looking statements in this presentation that represent the Company’s beliefs or expectations about future events or financial performance. These forward-looking statements are based on information currently available to Aegion and on management’s beliefs, assumptions, estimates and projections and are not guarantees of future events or results. When used in this presentation, the words “anticipate,” “estimate,” “believe,” “plan,” “intend,” “may,” “will” and similar expressions are intended to identify forward-looking statements, but are not the exclusive means of identifying such statements. Such statements are subject to known and unknown risks, uncertainties and assumptions, including those referred to in the “Risk Factors” section of Aegion’s Annual Report on Form 10-K for the year ended December 31, 2014 as filed with the Securities and Exchange Commission on March 2, 2015 and in Aegion’s subsequent Quarterly Reports on Form 10-Q. In light of these risks, uncertainties and assumptions, the forward-looking events discussed may not occur. In addition, Aegion’s actual results may vary materially from those anticipated, estimated, suggested or projected. Except as required by law, Aegion does not assume a duty to update forward-looking statements, whether as a result of new information, future events or otherwise. Investors should, however, review additional disclosures made by Aegion from time to time in its filings with the Securities and Exchange Commission. Please use caution and do not place reliance on forward-looking statements. All forward-looking statements made by Aegion in this presentation are qualified by these cautionary statements.

Aegion®, Bayou®, Bayou Wasco®, CRTS®, CCSI® and the Aegion® logo are the registered trademarks of Aegion Corporation and its affiliates.

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