arlington asset investment corp. (nyse: ai) is a principal investment firm that currently acquires and holds a levered portfolio of residential mortgage-backed securities ("mbs"​), consisting of agency mbs and private-label mbs. agency mbs include residential mortgage pass-through certificates for which the principal and interest payments are guaranteed by a u.s. government agency or government sponsored enterprise ("gse"​) such as fannie mae or freddie mac. private-label mbs, or non-agency mbs, include residential mbs that are not guaranteed by a gse or the u.s. government. the company prudently leverages its investment portfolio so as to increase potential returns to its shareholders. it funds its investments primarily through short-term financing arrangements, principally through repurchase agreements. the company enters into various hedging transactions to mitigate the interest rate sensitivity of its cost of borrowing and the value of its mbs portfolio. the company's common stock