BETHESDA, Md., Sept. 11, 2012 /PRNewswire/ -- American Capital Mortgage Investment Corp. (Nasdaq: MTGE) ("MTGE" or the "Company") announced today that its Board of Directors has declared a cash dividend of $0.90 per share for the third quarter 2012. The dividend is payable on October 26, 2012 to common shareholders of record as of September 21, 2012, with an ex-dividend date of September 19, 2012. For further information or questions, please contact our Investor Relations Department at (301) 968-9220 or IR@MTGE.com. ABOUT AMERICAN CAPITAL MORTGAGE INVESTMENT CORP.American Capital Mortgage Investment Corp. is a real estate investment trust formed in 2011 that invests in and manages a leveraged portfolio of agency mortgage investments, non-agency mortgage investments and other mortgage-related investments. The Company is externally managed and advised by American Capital MTGE Management, LLC, an affiliate of American Capital, Ltd. ("American Capital"). For further information please refer to www.MTGE.com. ABOUT AMERICAN CAPITALAmerican Capital is a publicly traded private equity firm and global asset manager. American Capital, both directly and through its asset management business, originates, underwrites and manages investments in middle market private equity, leveraged finance, real estate and structured products. American Capital manages $17 billion of assets, including assets on its balance sheet and fee earning assets under management by affiliated managers, with $100 billion of total assets under management (including levered assets). From its seven offices in the U.S. and Europe, American Capital and its affiliate, European Capital, will consider investment opportunities from $10 million to $500 million. For further information, please refer to www.AmericanCapital.com. CONTACT:Investor Relations – (301) 968-9220 SOURCE American Capital Mortgage Investment Corp.