More homebuyers opted for adjustable-rate mortgages as interest rates increased during 2013, although most of these loans remain in portfolio. ARMs accounted for 11.7 percent of mortgage originations in the third quarter of 2013, according to Inside Mortgage Finance, up from a share of 9.8 percent in the third quarter of 2012. Quarterly originations of ARMs have stayed relatively steady in recent years and hit $54 billion in the third quarter of 2013. But ARMs remain relatively rare in [Includes two data charts]