Credit Suisse issued a large prime non-agency mortgage-backed security this week with an unprecedented lack of disclosure: the single lender that provided loans for the deal wasn’t identified in presale reports. Fitch Ratings and Morningstar Credit Ratings placed AAA ratings on the $1.60 billion CSMC 2018-J1 Trust. It is the second largest post-crisis non-agency MBS backed by new originations. All of the loans in the deal were “acquired from a single originator in a bulk purchase ...