For Immediate Release Contact: Jeremy Milner 401-862-9422 jeremy@jeremymilner.com Jill Burnie 617-375-4217 jill.burnie@morgankeegan.com ........................................................................................................... Mercury Computer Systems Closes Offering of $99.0 Million of Common Shares February 16, 2011 - Mercury Computer Systems Inc. (NASDAQ: MRCY) (“Mercury” or the “Company”) announced the closing of its offering of 5,577,500 shares of common stock. The Company priced the offering at $17.75 per share for total proceeds, including the overallotment, of $99,000,625. Morgan Keegan served as Co-Manager on the transaction. About the Offering On February 16, 2011, Mercury closed the offering of 5,577,500 shares of common stock for total proceeds of $99,000,625. The Company intends to use the proceeds of the offering for general corporate purposes, including the acquisition of other companies, working capital and capital expenditures. Mercury initially announced the offering of 4,000,000 shares of common stock on February 7, 2011 and upsized the offering to 4,850,000 shares due to strong demand. The underwriters exercised their 15% overallotment option on February 14, 2011, bringing the total proceeds to $99,000,625. About Mercury Mercury designs, manufactures and markets high-performance embedded, real-time digital signal and image processing systems and software for specialized defense and commercial computing markets. The Company’s solutions play a critical role in a wide range of applications by transforming sensor data to information for analysis and interpretation. In military reconnaissance and surveillance platforms, the Company’s systems process real-time radar, video, sonar and signals intelligence data. Mercury’s systems are also used in semiconductor imaging applications, including photomask generation and wafer inspection. The Company also provides radio frequency products for enhanced communications capabilities in military and commercial applications.    About Morgan Keegan   Morgan Keegan, a full-service brokerage and investment banking firm, has more than 4,100 employees in 300 offices across the country. The firm’s Investment Banking division provides comprehensive merger and acquisition advisory, public equity and private capital services to public and private middle-market companies as well as private equity groups. Industry sectors include: Transportation & Logistics Industrial Consumer Energy Security & Defense Financial Services Healthcare Technology Real Estate

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