The field of firms looking to place ratings on non-agency mortgage-backed securities got a little more crowded last week. Morningstar Credit Ratings released its non-agency MBS rating guidelines with criteria similar to the five firms that have placed ratings on non-agency securities in recent years. Morningstar said it will provide “timely, unbiased and transparent” ratings on both new-issue and seasoned non-agency MBS. Securities will have to be able to withstand a “catastrophic event” to receive ...