Lehman Brothers Adjustable-Rate Mortgage Index

Lehman Brothers Adjustable-Rate Mortgage Index

A benchmark index that includes all agency-guaranteed securities with coupons that periodically adjust based on a spread over a published index.

Lehman Brothers Adjustable-Rate Mortgage Index

An index that tracks most investment-grade mortgage-backed securities guaranteed by an agency. It is a subset of the Lehman Brothers Aggregate Bond Index. Following Lehman Brothers' bankruptcy, it began to be managed by Barclays.