While non-agency MBS participants largely oppose a credit rating assignment system proposed by Sen. Al Franken, D-MN, some of the main players in the market endorse a model based on ratings rotation. At a roundtable hosted by the Securities and Exchange Commission this week, Martin Hughes, CEO of Redwood Trust, said issuer-paid rating conflicts could be reduced by requiring non-agency MBS issuers to alternate rating services so that one firm didn’t rate more than two consecutive deals from the issuer. He noted that Redwood has established a self-imposed rotation between Moody’s Investors Service and Standard & Poor’s on its non-agency MBS issuance. “The requirement to frequently alternate among the nationally recognized...