HOUSTON /PRNewswire/ – Effective 30 March 2012, GSE Holding, Inc., (NYSE:GSE) the leading global manufacturer and provider of geosynthetic lining products and services, joined the Russell 2000 Index, the most common benchmark for small cap mutual funds.

“We are excited to be included in the Russell 2000 Index. We believe that this will broaden our market exposure and bring long-term value to our shareholders," said Mark Arnold, GSE President and CEO.

About GSE ENVIRONMENTAL

GSE is a global manufacturer and marketer of geosynthetic lining solutions, products and services used in the containment and management of solids, liquids, and gases for organizations engaged in waste management, mining, water, wastewater, and aquaculture.

GSE has a long history of manufacturing quality geosynthetic lining systems and developing innovative products. The company’s principal products are polyethylene-based geomembranes, geonets, geocomposites, geosynthetic clay liners, concrete protection liners and vertical barriers. GSE manufactures products primarily to line or cap hazardous and non-hazardous waste landfills; contain materials generated in certain mining processes; and contain water, liquid waste and industrial products in ponds, tanks, reservoirs, sewers, and canals. Headquartered in Houston, Texas, USA, GSE maintains sales offices throughout the world and manufacturing facilities in the United States, Chile, Germany, Thailand and Egypt.

About the Russell 2000 Index

The Russell 2000 Index measures the performance of the small-cap segment of the U.S. equity universe. The Russell 2000 is a subset of the Russell 3000R Index representing approximately 10% of the total market capitalization of that index. It includes approximately 2000 of the smallest securities based on a combination of their market cap and current index membership.

The Russell 2000 Index is constructed to provide a comprehensive and unbiased small-cap barometer and is completely reconstituted annually to ensure larger stocks do not distort the performance and characteristics of the true small-cap opportunity set.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Securities Act of 1933, as amended, and the Securities Exchange Act of 1934, as amended. Such forward-looking statements are subject to certain risks and uncertainties, as disclosed by GSE from time to time in its filings with the Securities and Exchange Commission. As a result of these factors, GSE’s actual results may differ materially from those indicated or implied by such forward-looking statements. Except as required by law, GSE disclaims any obligation to publicly update such statements.

Risk factors that may cause actual results to differ materially from statements made in this press release can be found in GSE’s 10-K, filed with the SEC on March 30, 2012. This document and other SEC filings are available under the Investor Relations section of GSE’s website at www.gseworld.com.

CONTACT

Cade Kohoutek
Director, Financial Reporting, Planning & Analysis
+1 281 230 6733
ckohoutek@gseworld.com