Credit Suisse Group (CS) is seeking to sell $407.4 million of securities tied to new jumbo U.S. home loans without government backing in the third deal of the type this year, according to three people familiar with the matter.

The bank is marketing the bonds, which it expects to receive top ratings, to pay a spread of 0.97 percentage point more than benchmark swaps, according to the people, who asked not to be identified, citing a lack of authorization to speak publicly.