LOS ANGELES, Feb. 19, 2014 /PRNewswire/ -- B. Riley & Co., LLC, (B. Riley) www.brileyco.com, a leading independent investment bank which provides a full array of corporate finance, research, sales and trading services announced that it acted as co- manager in a $34.5 Million Underwritten Public Offering for Mattson Technology, Inc. (NASDAQ: MTSN).

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The offering, which closed February 14, 2014, consisted of approximately 14.1 million shares of common stock priced at $2.45 per share, which included an overallotment of approximately 1.84 million shares which the underwriters exercised in full.

B. Riley's Director, Salomon Kamalodine, and Chairman, Bryant Riley, led the banking team. In connection with the offering Needham & Company, LLC and Cowen and Company, LLC acted as joint book-running managers.

Fremont, California-based Mattson Technology, Inc. (www.mattson.com) designs, manufactures and markets semiconductor wafer processing equipment used in the fabrication of integrated circuits. It is a leading supplier of plasma and rapid thermal processing equipment to the global semiconductor industry, and operates in four primary product sectors: Dry Strip, Etch, Rapid Thermal Processing and Millisecond Anneal.

This communication shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About B. RILEY & CO.

B. Riley & Co. is a leading independent investment bank which provides a full array of corporate finance, research, sales, trading and otcqx dad services to corporate, institutional and high net worth individual clients. Investment banking services include merger and acquisitions advisory to public and private middle market companies, initial and secondary public offerings and institutional private placements. Its Corporate Governance Advisory Services Group is engaged by both companies and investors to help maximize value for shareholders. The firm is recognized for its distinguished Equity Research. Founded in 1997, B. Riley is headquartered in Los Angeles and maintains offices in Newport Beach, Del Mar, San Francisco, and New York. It is a member of FINRA and SIPC. For more information, please visit www.brileyco.com

SOURCE B. Riley & Co., LLC