Corporate bond spread chart
Aaa is the highest rating a corporate bond can get, and is considered investment grade. Another important way to analyze bond yields is spreads between different kinds of bonds. During the financial crisis in 2008-2009, the spread between Aaa and Baa bonds widened because of the unpredictability of bonds and increased default rates. Moody's Seasoned Aaa Corporate Bond Yield is at 3.03%, compared to 2.94% the previous market day and 3.84% last year.