We are an internally managed mortgage real estate investment trust, or mortgage REIT, which primarily invests in residential and commercial mortgage-backed securities ("MBS") on a leveraged basis. We finance our investments principally with borrowings under repurchase agreements. Our objective is to provide attractive risk-adjusted returns to our shareholders over the long term that are reflective of a leveraged, high quality fixed income portfolio with a focus on capital preservation. We seek to provide returns to our shareholders primarily through the payment of regular dividends and also potentially through capital appreciation of our investments.
Our common stock is traded on the New York Stock Exchange ("NYSE") under the symbol "DX". We have two series of preferred stock outstanding, our 8.50% Series A Cumulative Redeemable Preferred Stock (the "Series A Preferred Stock") which is traded on the NYSE under the symbol "DXPRA", and our 7.625% Series B Cumulative Redeemable Preferred Stock (the "Series B Preferred Stock") which is traded on the NYSE under the symbol "DXPRB".
Our investments consist principally of Agency and non-Agency MBS including residential MBS ("RMBS"), commercial MBS ("CMBS") and CMBS interest-only ("IO") securities. Agency MBS have a guaranty of principal payment by an agency of the U.S. government or a U.S. government-sponsored entity ("GSE") such as Fannie Mae and Freddie Mac. Non-Agency MBS are issued by non-governmental enterprises and do not have a guaranty of principal payment. CMBS IO securities in which we invest may be issued by a GSE or a non-governmental enterprise. We may also invest in debt securities issued by the United States Department of the Treasury ("the Treasury" and such securities, "U.S. Treasuries").