Risk-retention requirements for the majority of MBS and ABS sectors were in effect by the end of December, and industry participants have largely adjusted to them, according to analysts. The Dodd-Frank Act generally requires sponsors of ABS, non-agency MBS and commercial MBS to retain at least 5.0 percent of each deal. The retention requirements for residential mortgages took effect at the end of 2015, though most deals have been backed completely by qualified mortgages, which makes them exempt from risk retention. Other asset types have...