The share of adjustable-rate mortgages held in portfolio hit an exceptionally high level in the second quarter of 2016, according to a new analysis by Inside Nonconforming Markets. An estimated $53.00 billion in ARMs were originated in the second quarter of 2016 and $4.69 billion in ARMs were included in mortgage-backed securities issued during the period. The ARM securitization rate in the second quarter was 8.8 percent, down from 13.9 percent ... [Includes two data charts]